DXF TEXT & MTEXT \u5b9e\u4f53\u5b8c\u5168\u53c2\u8003<\/span>DXF TEXT & MTEXT Entity Complete Reference<\/span><\/title>\n<style>\n:root {\n --bg: #f5faf7;\n --bg2: #eef6f1;\n --ink: #1a2e23;\n --muted: #5a7a6e;\n --rule: #c0d8cc;\n --accent: #059669;\n --accent2: #0d9488;\n --code-bg: #1e2d26;\n --code-fg: #d1fae5;\n --warn-bg: #fff7ed;\n --warn-border: #f97316;\n --info-bg: #eff6ff;\n --info-border: #3b82f6;\n}\n\n* { box-sizing: border-box; margin: 0; padding: 0; }\n\nhtml { scroll-behavior: smooth; }\n\nbody {\n font-family: \"Microsoft YaHei\", \"PingFang SC\", system-ui, -apple-system, sans-serif;\n background: var(--bg);\n color: var(--ink);\n line-height: 1.8;\n}\n\nbody.en-active { font-family: system-ui, -apple-system, sans-serif; }\n\n\/* Language Switcher Bar *\/\n.lang-bar {\n position: sticky;\n top: 0;\n z-index: 1000;\n background: var(--accent);\n display: flex;\n justify-content: center;\n gap: 1rem;\n padding: 0.6rem 1rem;\n box-shadow: 0 2px 8px rgba(0,0,0,0.15);\n}\n\n.lang-bar button {\n background: rgba(255,255,255,0.2);\n border: 2px solid transparent;\n color: #fff;\n padding: 0.4rem 1.2rem;\n border-radius: 4px;\n cursor: pointer;\n font-size: 0.95rem;\n font-weight: 600;\n transition: all 0.2s;\n}\n\n.lang-bar button:hover {\n background: rgba(255,255,255,0.35);\n}\n\n.lang-bar button.active {\n background: #fff;\n color: var(--accent);\n border-color: #fff;\n}\n\n\/* Container *\/\n.container {\n max-width: 1100px;\n margin: 0 auto;\n padding: 0 1.5rem;\n}\n\n\/* Cover *\/\n.cover {\n text-align: center;\n padding: 4rem 1rem 3rem;\n background: var(--bg2);\n border-bottom: 1px solid var(--rule);\n}\n\n.cover h1 {\n font-size: 2.2rem;\n color: var(--ink);\n margin-bottom: 0.8rem;\n font-weight: 700;\n}\n\n.cover .subtitle {\n font-size: 1.3rem;\n color: var(--accent);\n font-weight: 600;\n margin-bottom: 0.6rem;\n}\n\n.cover .desc {\n font-size: 1rem;\n color: var(--muted);\n}\n\n\/* TOC *\/\n.toc {\n background: #fff;\n border: 1px solid var(--rule);\n border-radius: 8px;\n padding: 1.5rem 2rem;\n margin: 2rem 0;\n}\n\n.toc h2 {\n font-size: 1.3rem;\n margin-bottom: 1rem;\n color: var(--accent);\n}\n\n.toc ol, .toc ul {\n padding-left: 1.5rem;\n}\n\n.toc li {\n margin: 0.4rem 0;\n}\n\n.toc a {\n color: var(--ink);\n text-decoration: none;\n transition: color 0.2s;\n}\n\n.toc a:hover {\n color: var(--accent);\n text-decoration: underline;\n}\n\n\/* Sections *\/\nsection {\n background: #fff;\n border: 1px solid var(--rule);\n border-radius: 8px;\n padding: 2rem 2.5rem;\n margin: 2rem 0;\n}\n\nsection h2 {\n font-size: 1.6rem;\n color: var(--accent);\n margin-bottom: 1.2rem;\n padding-bottom: 0.5rem;\n border-bottom: 2px solid var(--rule);\n}\n\nsection h3 {\n font-size: 1.25rem;\n color: var(--accent2);\n margin: 1.5rem 0 0.8rem;\n}\n\nsection h4 {\n font-size: 1.1rem;\n color: var(--ink);\n margin: 1.2rem 0 0.6rem;\n}\n\nsection p {\n margin-bottom: 0.9rem;\n text-align: justify;\n}\n\n\/* Tables *\/\ntable {\n width: 100%;\n border-collapse: collapse;\n margin: 1.2rem 0;\n font-size: 0.95rem;\n}\n\nth, td {\n border: 1px solid var(--rule);\n padding: 0.7rem 0.9rem;\n text-align: left;\n}\n\nth {\n background: var(--bg2);\n font-weight: 600;\n color: var(--ink);\n}\n\ntr:nth-child(even) { background: var(--bg); }\n\n\/* Code *\/\npre {\n background: var(--code-bg);\n color: var(--code-fg);\n padding: 1.2rem 1.5rem;\n border-radius: 6px;\n overflow-x: auto;\n font-family: Consolas, \"Courier New\", monospace;\n font-size: 0.9rem;\n line-height: 1.6;\n margin: 1rem 0;\n}\n\ncode {\n font-family: Consolas, \"Courier New\", monospace;\n background: rgba(5,150,105,0.1);\n padding: 0.15rem 0.4rem;\n border-radius: 3px;\n font-size: 0.9em;\n color: var(--accent);\n}\n\npre code {\n background: transparent;\n padding: 0;\n color: inherit;\n}\n\n\/* Group code highlight *\/\n.gc {\n font-family: Consolas, \"Courier New\", monospace;\n font-weight: 700;\n color: var(--accent2);\n}\n\n\/* Type badges *\/\n.type-badge {\n display: inline-block;\n padding: 0.15em 0.5em;\n border-radius: 4px;\n font-size: 0.72rem;\n font-weight: 600;\n white-space: nowrap;\n}\n\n.type-str { background: #d1fae5; color: #065f46; }\n.type-float { background: #e0e7ff; color: #3730a3; }\n.type-int { background: #fef3c7; color: #92400e; }\n.type-bool { background: #dbeafe; color: #1e40af; }\n.type-handle { background: #fef9c3; color: #854d0e; }\n.type-binary { background: #fce7f3; color: #9d174d; }\n.type-special { background: #f3f4f6; color: #4b5563; }\n\n\/* Tip box *\/\n.tip-box {\n background: #ecfdf5;\n border-left: 4px solid var(--accent);\n padding: 1rem 1.2rem;\n margin: 1.2rem 0;\n border-radius: 0 6px 6px 0;\n font-size: 0.95rem;\n}\n\n.tip-box strong { color: var(--accent); }\n\n\/* Warning box *\/\n.warn-box {\n background: var(--warn-bg);\n border-left: 4px solid var(--warn-border);\n padding: 1rem 1.2rem;\n margin: 1.2rem 0;\n border-radius: 0 6px 6px 0;\n font-size: 0.95rem;\n}\n\n.warn-box strong { color: var(--warn-border); }\n\n\/* Info box *\/\n.info-box {\n background: var(--info-bg);\n border-left: 4px solid var(--info-border);\n padding: 1rem 1.2rem;\n margin: 1.2rem 0;\n border-radius: 0 6px 6px 0;\n font-size: 0.95rem;\n}\n\n.info-box strong { color: var(--info-border); }\n\n\/* Table wrap for scrolling *\/\n.table-wrap {\n overflow-x: auto;\n margin-bottom: 1rem;\n}\n\n\/* Section icon *\/\n.section-icon {\n width: 32px;\n height: 32px;\n border-radius: 8px;\n background: var(--bg2);\n display: inline-flex;\n align-items: center;\n justify-content: center;\n font-size: 1rem;\n margin-right: 0.6rem;\n vertical-align: middle;\n}\n\n\/* Comparison grid *\/\n.compare-grid {\n display: grid;\n grid-template-columns: 1fr 1fr;\n gap: 1.5rem;\n margin: 1.5rem 0;\n}\n\n.compare-card {\n background: var(--bg);\n border: 1px solid var(--rule);\n border-radius: 8px;\n padding: 1.2rem;\n}\n\n.compare-card h4 {\n margin-top: 0;\n color: var(--accent);\n border-bottom: 1px solid var(--rule);\n padding-bottom: 0.5rem;\n}\n\n\/* Diagram area *\/\n.diagram-area {\n background: #fff;\n border: 1px solid var(--rule);\n border-radius: 8px;\n padding: 1.5rem;\n margin: 1.2rem 0;\n text-align: center;\n}\n\n.diagram-title {\n font-weight: 600;\n color: var(--muted);\n margin-bottom: 1rem;\n font-size: 0.9rem;\n}\n\n\/* Footnotes *\/\n.footnotes {\n font-size: 0.85rem;\n color: var(--muted);\n border-top: 1px solid var(--rule);\n margin-top: 2rem;\n padding-top: 1rem;\n text-align: center;\n}\n\n\/* Responsive *\/\n@media (max-width: 768px) {\n .cover h1 { font-size: 1.5rem; }\n .cover .subtitle { font-size: 1.05rem; }\n section { padding: 1.2rem 1rem; }\n section h2 { font-size: 1.3rem; }\n .compare-grid { grid-template-columns: 1fr; }\n table { font-size: 0.85rem; }\n th, td { padding: 0.5rem; }\n}\n\n\/* Language display control *\/\n[data-lang=\"en\"] { display: none; }\nhtml[lang=\"en\"] [data-lang=\"zh\"] { display: none; }\nhtml[lang=\"en\"] [data-lang=\"en\"] { display: inline; }\n\n\/* For block elements *\/\nh2 [data-lang=\"en\"], h3 [data-lang=\"en\"], h4 [data-lang=\"en\"], p [data-lang=\"en\"], li [data-lang=\"en\"], th [data-lang=\"en\"], td [data-lang=\"en\"], div [data-lang=\"en\"] {\n display: none;\n}\n\nhtml[lang=\"en\"] h2 [data-lang=\"zh\"], html[lang=\"en\"] h3 [data-lang=\"zh\"], html[lang=\"en\"] h4 [data-lang=\"zh\"], html[lang=\"en\"] p [data-lang=\"zh\"], html[lang=\"en\"] li [data-lang=\"zh\"], html[lang=\"en\"] th [data-lang=\"zh\"], html[lang=\"en\"] td [data-lang=\"zh\"], html[lang=\"en\"] div [data-lang=\"zh\"] {\n display: none;\n}\n\nhtml[lang=\"en\"] h2 [data-lang=\"en\"], html[lang=\"en\"] h3 [data-lang=\"en\"], html[lang=\"en\"] h4 [data-lang=\"en\"], html[lang=\"en\"] p [data-lang=\"en\"], html[lang=\"en\"] li [data-lang=\"en\"], html[lang=\"en\"] th [data-lang=\"en\"], html[lang=\"en\"] td [data-lang=\"en\"], html[lang=\"en\"] div [data-lang=\"en\"] {\n display: inline;\n}\n\n\/* Inline fix for block-level multilingual wrappers *\/\n.toc h2 span, .cover h1 span, .cover .subtitle span, .cover .desc span, section h2 span, section h3 span, section h4 span, .code-label span, .stat-label span {\n display: inline;\n}\n\nhtml[lang=\"en\"] .toc h2 [data-lang=\"zh\"], html[lang=\"en\"] .cover h1 [data-lang=\"zh\"], html[lang=\"en\"] .cover .subtitle [data-lang=\"zh\"], html[lang=\"en\"] .cover .desc [data-lang=\"zh\"], html[lang=\"en\"] section h2 [data-lang=\"zh\"], html[lang=\"en\"] section h3 [data-lang=\"zh\"], html[lang=\"en\"] section h4 [data-lang=\"zh\"], html[lang=\"en\"] .code-label [data-lang=\"zh\"], html[lang=\"en\"] .stat-label [data-lang=\"zh\"] {\n display: none;\n}\n\nhtml[lang=\"en\"] .toc h2 [data-lang=\"en\"], html[lang=\"en\"] .cover h1 [data-lang=\"en\"], html[lang=\"en\"] .cover .subtitle [data-lang=\"en\"], html[lang=\"en\"] .cover .desc [data-lang=\"en\"], html[lang=\"en\"] section h2 [data-lang=\"en\"], html[lang=\"en\"] section h3 [data-lang=\"en\"], html[lang=\"en\"] section h4 [data-lang=\"en\"], html[lang=\"en\"] .code-label [data-lang=\"en\"], html[lang=\"en\"] .stat-label [data-lang=\"en\"] {\n display: inline;\n}\n\n\/* Attachment point grid diagram *\/\n.attachment-grid {\n display: grid;\n grid-template-columns: repeat(3, 80px);\n grid-template-rows: repeat(3, 80px);\n gap: 4px;\n margin: 1rem auto;\n width: fit-content;\n}\n\n.attachment-cell {\n border: 2px solid var(--rule);\n display: flex;\n align-items: center;\n justify-content: center;\n font-size: 0.85rem;\n font-weight: 600;\n color: var(--muted);\n background: #fff;\n border-radius: 4px;\n position: relative;\n}\n\n.attachment-cell.default {\n border-color: var(--accent);\n background: #ecfdf5;\n color: var(--accent);\n}\n\n.attachment-cell .cell-pos {\n position: absolute;\n top: 2px;\n left: 4px;\n font-size: 0.65rem;\n opacity: 0.7;\n}\n\n\/* Baseline diagram *\/\n.baseline-diagram {\n position: relative;\n height: 120px;\n margin: 1rem auto;\n max-width: 500px;\n border-left: 2px solid var(--ink);\n border-bottom: 2px solid var(--ink);\n}\n\n.baseline-line {\n position: absolute;\n left: 0;\n right: 0;\n border-top: 2px dashed var(--accent);\n}\n\n.baseline-label {\n position: absolute;\n font-size: 0.8rem;\n color: var(--muted);\n}\n<\/style>\n<\/head>\n<body>\n\n\n<div class=\"lang-bar\">\n <button id=\"btn-zh\" class=\"active\" onclick=\"switchLanguage('zh')\">\n \u4e2d\u6587<\/span>Chinese<\/span>\n <\/button>\n <button id=\"btn-en\" onclick=\"switchLanguage('en')\">\n English<\/span>English<\/span>\n <\/button>\n<\/div>\n\n<div class=\"container\">\n\n\n<div class=\"cover\">\n <h1>DXF TEXT & MTEXT \u5b9e\u4f53\u5b8c\u5168\u53c2\u8003<\/span>DXF TEXT & MTEXT Entity Complete Reference<\/span><\/h1>\n <div class=\"subtitle\">DXF Text Entities Deep Dive<\/div>\n <div class=\"desc\">\u6df1\u5165\u89e3\u6790 DXF \u6587\u4ef6\u4e2d TEXT\uff08\u5355\u884c\u6587\u5b57\uff09\u4e0e MTEXT\uff08\u591a\u884c\u6587\u5b57\uff09\u5b9e\u4f53\u7684\u7ec4\u7801\u5b9a\u4e49\u3001\u5bf9\u9f50\u673a\u5236\u3001\u57fa\u7ebf\u6982\u5ff5\u53ca\u7f16\u7a0b\u63a5\u53e3<\/span>Deep dive into TEXT (single-line) and MTEXT (multiline) entity group codes, alignment mechanisms, baseline concepts, and programming interfaces<\/span><\/div>\n<\/div>\n\n\n<nav class=\"toc\">\n <h2>\u76ee\u5f55<\/span>Table of Contents<\/span><\/h2>\n <ol>\n <li><a href=\"#baseline\">\u4ec0\u4e48\u662f\u57fa\u7ebf\uff08Baseline\uff09<\/span>What is the Baseline<\/span><\/a><\/li>\n <li><a href=\"#diff\">TEXT \u4e0e MTEXT \u6838\u5fc3\u533a\u522b<\/span>TEXT vs MTEXT Core Differences<\/span><\/a><\/li>\n <li><a href=\"#text-entity\">TEXT \u5b9e\u4f53\u8be6\u89e3<\/span>TEXT Entity in Detail<\/span><\/a><\/li>\n <li><a href=\"#mtext-entity\">MTEXT \u5b9e\u4f53\u8be6\u89e3<\/span>MTEXT Entity in Detail<\/span><\/a><\/li>\n <li><a href=\"#alignment\">\u5bf9\u9f50\u673a\u5236\u5bf9\u6bd4<\/span>Alignment Mechanism Comparison<\/span><\/a><\/li>\n <li><a href=\"#bbox\">\u5982\u4f55\u7406\u89e3 BBox\uff08\u8fb9\u754c\u6846\uff09<\/span>Understanding BBox (Bounding Box)<\/span><\/a><\/li>\n <li><a href=\"#size-methods\">text_size \u4e0e mtext_size \u65b9\u6cd5<\/span>text_size and mtext_size Methods<\/span><\/a><\/li>\n <li><a href=\"#common-errors\">\u5e38\u89c1\u9519\u8bef\u4e0e\u6ce8\u610f\u4e8b\u9879<\/span>Common Errors & Pitfalls<\/span><\/a><\/li>\n <\/ol>\n<\/nav>\n\n\n<section id=\"baseline\">\n<div class=\"section-icon\">\ud83d\udccf<\/div>\n<h2>\u4ec0\u4e48\u662f\u57fa\u7ebf\uff08Baseline\uff09<\/span>What is the Baseline<\/span><\/h2>\n\n\u5728\u6392\u7248\u5b66\u548c CAD \u7ed8\u56fe\u4e2d\uff0c\u57fa\u7ebf\uff08Baseline\uff09<\/strong>\u662f\u6587\u5b57\u5b57\u7b26\u6240\u5750\u843d\u7684\u4e00\u6761\u5047\u60f3\u6c34\u5e73\u7ebf\u3002\u5bf9\u4e8e\u62c9\u4e01\u5b57\u6bcd\uff08\u5982 a, b, c\uff09\uff0c\u5b57\u7b26\u7684\u4e3b\u4f53\u90e8\u5206\u5750\u843d\u5728\u57fa\u7ebf\u4e0a\uff0c\u800c\u4e0b\u4f38\u90e8\u5206\uff08\u5982 g, p, y \u7684\u5c3e\u90e8\uff09\u5219\u4f1a\u5ef6\u4f38\u5230\u57fa\u7ebf\u4e0b\u65b9\u3002<\/span>In typography and CAD drawing, the baseline<\/strong> is an imaginary horizontal line on which text characters sit. For Latin letters (a, b, c), the main body rests on the baseline, while descenders (like g, p, y) extend below it.<\/span><\/p>\n\n<div class=\"diagram-area\">\n <div class=\"diagram-title\">\u6587\u5b57\u57fa\u7ebf\u793a\u610f\u56fe<\/span>Text Baseline Diagram<\/span><\/div>\n <svg viewBox=\"0 0 500 140\" style=\"max-width:500px;width:100%;height:auto;\">\n \n <line x1=\"30\" y1=\"25\" x2=\"470\" y2=\"25\" stroke=\"#c0d8cc\" stroke-dasharray=\"4,4\" stroke-width=\"1\"\/>\n <text x=\"10\" y=\"28\" font-size=\"11\" fill=\"#5a7a6e\" text-anchor=\"end\">Ascent<\/text>\n\n \n <line x1=\"30\" y1=\"65\" x2=\"470\" y2=\"65\" stroke=\"#c0d8cc\" stroke-dasharray=\"4,4\" stroke-width=\"1\"\/>\n <text x=\"10\" y=\"68\" font-size=\"11\" fill=\"#5a7a6e\" text-anchor=\"end\">X-height<\/text>\n\n \n <line x1=\"30\" y1=\"95\" x2=\"470\" y2=\"95\" stroke=\"#059669\" stroke-width=\"2\"\/>\n <text x=\"10\" y=\"100\" font-size=\"11\" fill=\"#059669\" font-weight=\"bold\" text-anchor=\"end\">Baseline<\/text>\n\n \n <line x1=\"30\" y1=\"115\" x2=\"470\" y2=\"115\" stroke=\"#c0d8cc\" stroke-dasharray=\"4,4\" stroke-width=\"1\"\/>\n <text x=\"10\" y=\"118\" font-size=\"11\" fill=\"#5a7a6e\" text-anchor=\"end\">Descent<\/text>\n\n \n <text x=\"50\" y=\"95\" font-family=\"serif\" font-size=\"60\" fill=\"#1a2e23\">AbgXp<\/text>\n\n \n <line x1=\"280\" y1=\"25\" x2=\"280\" y2=\"95\" stroke=\"#0d9488\" stroke-width=\"1\" marker-end=\"url(#arrowup)\" marker-start=\"url(#arrowdown)\"\/>\n <text x=\"285\" y=\"62\" font-size=\"11\" fill=\"#0d9488\" font-weight=\"bold\">Text Height<\/text>\n\n \n <defs>\n <marker id=\"arrowup\" markerWidth=\"6\" markerHeight=\"6\" refX=\"3\" refY=\"6\" orient=\"auto\">\n <path d=\"M0,6 L3,0 L6,6\" fill=\"#0d9488\"\/>\n <\/marker>\n <marker id=\"arrowdown\" markerWidth=\"6\" markerHeight=\"6\" refX=\"3\" refY=\"0\" orient=\"auto\">\n <path d=\"M0,0 L3,6 L6,0\" fill=\"#0d9488\"\/>\n <\/marker>\n <\/defs>\n <\/svg>\n<\/div>\n\n\u5728 DXF \u7684 <code>TEXT<\/code> \u5b9e\u4f53\u4e2d\uff0c\u9ed8\u8ba4\u7684\u63d2\u5165\u70b9\uff08\u7ec4\u7801 10\/20\/30\uff09\u5c31\u4f4d\u4e8e\u6587\u5b57\u7684\u5de6\u7aef\u57fa\u7ebf\u5904<\/strong>\u3002\u4e5f\u5c31\u662f\u8bf4\uff0c\u5f53\u4f60\u8f93\u5165\u4e00\u4e2a TEXT \u5b9e\u4f53\u800c\u4e0d\u6307\u5b9a\u4efb\u4f55\u5bf9\u9f50\u65b9\u5f0f\u65f6\uff0c\u6587\u5b57\u5c06\u4ece\u63d2\u5165\u70b9\u5f00\u59cb\u5411\u53f3\u4fa7\u5ef6\u4f38\uff0c\u5b57\u7b26\u5e95\u90e8\u5750\u843d\u5728\u57fa\u7ebf\u4e0a\u3002\u8fd9\u4e0e <code>MTEXT<\/code> \u4e0d\u540c\uff1aMTEXT \u9ed8\u8ba4\u7684\u63d2\u5165\u70b9\u4f4d\u4e8e\u6587\u5b57\u7684\u5de6\u4e0a\u89d2<\/strong>\u3002<\/span>In DXF <code>TEXT<\/code> entities, the default insertion point (group codes 10\/20\/30) is at the left end of the baseline<\/strong>. When you create a TEXT entity without specifying alignment, text extends to the right from the insertion point with characters sitting on the baseline. This differs from <code>MTEXT<\/code>, whose default insertion point is at the top-left corner<\/strong> of the text.<\/span><\/p>\n\n<div class=\"tip-box\">\n\u8bb0\u5fc6\u8981\u70b9<\/span>Key Takeaway<\/span><\/strong><br\/>\nTEXT \u9ed8\u8ba4\u63d2\u5165\u70b9 = \u5de6\u4e0b\u89d2\u57fa\u7ebf\u5904\uff08\u8fd1\u4f3c\u5de6\u4e0b\u89d2\uff0c\u4f46\u56e0\u57fa\u7ebf\u975e\u6700\u5e95\u90e8\uff0c\u4e25\u683c\u8bf4\u662f\u5de6\u7aef\u57fa\u7ebf\uff09\u3002<br\/>MTEXT \u9ed8\u8ba4\u63d2\u5165\u70b9 = \u5de6\u4e0a\u89d2\u3002<\/span>\nTEXT default insertion point = left end of baseline (approximately lower-left, but strictly speaking left end of baseline since baseline is not the very bottom).<br\/>MTEXT default insertion point = top-left corner.<\/span>\n<\/div>\n<\/section>\n\n\n<section id=\"diff\">\n<div class=\"section-icon\">\u2696\ufe0f<\/div>\n<h2>TEXT \u4e0e MTEXT \u6838\u5fc3\u533a\u522b<\/span>TEXT vs MTEXT Core Differences<\/span><\/h2>\n\n<div class=\"table-wrap\">\n<table>\n<thead>\n<tr>\n<th>\u7279\u6027<\/span>Feature<\/span><\/th>\n<th>TEXT\uff08\u5355\u884c\u6587\u5b57\uff09<\/span>TEXT (Single-line)<\/span><\/th>\n<th>MTEXT\uff08\u591a\u884c\u6587\u5b57\uff09<\/span>MTEXT (Multiline)<\/span><\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>\u6587\u5b57\u5185\u5bb9<\/span>Content<\/span><\/td>\n<td>\u5355\u884c\u7eaf\u6587\u672c\uff0c\u65e0\u683c\u5f0f\u63a7\u5236<\/span>Single line of plain text, no formatting<\/span><\/td>\n<td>\u591a\u884c\u6587\u672c\uff0c\u652f\u6301\u5bcc\u683c\u5f0f\uff08\u5b57\u4f53\u3001\u989c\u8272\u3001\u9ad8\u5ea6\u3001\u5806\u53e0\u7b49\uff09<\/span>Multiline text with rich formatting (font, color, height, stacking, etc.)<\/span><\/td>\n<\/tr>\n<tr>\n<td>\u6362\u884c\u652f\u6301<\/span>Line Breaks<\/span><\/td>\n<td>\u4e0d\u652f\u6301\u81ea\u52a8\u6362\u884c\uff0c\u9700\u624b\u52a8\u63d2\u5165\u591a\u4e2a TEXT<\/span>No automatic wrapping; multiple TEXT entities needed<\/span><\/td>\n<td>\u652f\u6301\u81ea\u52a8\u6362\u884c\u548c\u6bb5\u843d<\/span>Supports automatic wrapping and paragraphs<\/span><\/td>\n<\/tr>\n<tr>\n<td>\u9ed8\u8ba4\u63d2\u5165\u70b9<\/span>Default Insertion Point<\/span><\/td>\n<td>\u5de6\u7aef\u57fa\u7ebf\u5904\uff08\u5de6\u4e0b\u8fd1\u4f3c\uff09<\/span>Left end of baseline (approx. lower-left)<\/span><\/td>\n<td>\u5de6\u4e0a\u89d2<\/span>Top-left corner<\/span><\/td>\n<\/tr>\n<tr>\n<td>\u5bf9\u9f50\u63a7\u5236<\/span>Alignment Control<\/span><\/td>\n<td><code>halign<\/code> (72) + <code>valign<\/code> (73) \u4e24\u4e2a\u5b57\u6bb5<\/span><code>halign<\/code> (72) + <code>valign<\/code> (73) two fields<\/span><\/td>\n<td><code>attachment_point<\/code> (71) \u5355\u4e00\u5b57\u6bb5<\/span><code>attachment_point<\/code> (71) single field<\/span><\/td>\n<\/tr>\n<tr>\n<td>\u6587\u5b57\u9ad8\u5ea6<\/span>Text Height<\/span><\/td>\n<td>\u7ec4\u7801 40\uff0c\u7edf\u4e00\u9ad8\u5ea6<\/span>Group code 40, uniform height<\/span><\/td>\n<td>\u7ec4\u7801 40 \u4e3a\u6807\u79f0\u9ad8\u5ea6\uff0c\u6bcf\u884c\u53ef\u4e0d\u540c<\/span>Group code 40 is nominal height; each line may differ<\/span><\/td>\n<\/tr>\n<tr>\n<td>\u5bbd\u5ea6\u56e0\u5b50<\/span>Width Factor<\/span><\/td>\n<td>\u7ec4\u7801 41<\/span>Group code 41<\/span><\/td>\n<td>\u7ec4\u7801 41 \u4e3a\u53c2\u8003\u77e9\u5f62\u5bbd\u5ea6<\/span>Group code 41 is reference rectangle width<\/span><\/td>\n<\/tr>\n<tr>\n<td>\u65cb\u8f6c\u89d2\u5ea6<\/span>Rotation<\/span><\/td>\n<td>\u7ec4\u7801 50<\/span>Group code 50<\/span><\/td>\n<td>\u7ec4\u7801 50<\/span>Group code 50<\/span><\/td>\n<\/tr>\n<tr>\n<td>\u9002\u7528\u573a\u666f<\/span>Use Case<\/span><\/td>\n<td>\u7b80\u5355\u6807\u7b7e\u3001\u6807\u6ce8\u6587\u5b57\u3001\u5c5e\u6027\u503c<\/span>Simple labels, dimension text, attribute values<\/span><\/td>\n<td>\u6bb5\u843d\u8bf4\u660e\u3001\u6280\u672f\u6ce8\u91ca\u3001\u591a\u884c\u6807\u6ce8<\/span>Paragraph descriptions, technical notes, multiline annotations<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n\n<div class=\"info-box\">\n\u5b9e\u4f53\u7c7b\u578b\u6807\u8bc6<\/span>Entity Type Identifiers<\/span><\/strong><br\/>\n\u5728 DXF \u6587\u4ef6\u4e2d\uff0c\u7ec4\u7801 0 \u7684\u503c\u533a\u5206\u4e24\u79cd\u5b9e\u4f53\uff1a<code>TEXT<\/code> \u8868\u793a\u5355\u884c\u6587\u5b57\uff0c<code>MTEXT<\/code> \u8868\u793a\u591a\u884c\u6587\u5b57\u3002\u4e24\u8005\u4e0d\u80fd\u6df7\u7528\uff0c\u5404\u81ea\u62e5\u6709\u72ec\u7acb\u7684\u7ec4\u7801\u5b9a\u4e49\u3002<\/span>\nIn DXF files, group code 0 distinguishes the two: <code>TEXT<\/code> for single-line text, <code>MTEXT<\/code> for multiline text. They are not interchangeable and each has its own group code definitions.<\/span>\n<\/div>\n<\/section>\n\n\n<section id=\"text-entity\">\n<div class=\"section-icon\">\ud83d\udcdd<\/div>\n<h2>TEXT \u5b9e\u4f53\u8be6\u89e3<\/span>TEXT Entity in Detail<\/span><\/h2>\n\n<code>TEXT<\/code> \u662f DXF \u4e2d\u6700\u57fa\u672c\u7684\u6587\u5b57\u5b9e\u4f53\uff0c\u7528\u4e8e\u8868\u793a\u5355\u884c\u6587\u5b57\u3002\u5b83\u7684\u63d2\u5165\u70b9\u3001\u9ad8\u5ea6\u3001\u65cb\u8f6c\u89d2\u5ea6\u548c\u5bf9\u9f50\u65b9\u5f0f\u90fd\u7531\u72ec\u7acb\u7684\u7ec4\u7801\u63a7\u5236\u3002<\/span><code>TEXT<\/code> is the most basic text entity in DXF, representing a single line of text. Its insertion point, height, rotation angle, and alignment are controlled by independent group codes.<\/span><\/p>\n\n<h3>TEXT \u4e13\u5c5e\u7ec4\u7801<\/span>TEXT-Specific Group Codes<\/span><\/h3>\n<div class=\"table-wrap\">\n<table>\n<thead>\n<tr>\n<th>\u7ec4\u7801<\/span>Code<\/span><\/th>\n<th>\u5b57\u6bb5\u540d<\/span>Field Name<\/span><\/th>\n<th>\u4e2d\u6587\u8bf4\u660e<\/span>Description<\/span><\/th>\n<th>\u7c7b\u578b<\/span>Type<\/span><\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr><td>1<\/span><\/td><td>Text String<\/td><td>\u6587\u5b57\u5185\u5bb9\u5b57\u7b26\u4e32<\/span>The text string itself<\/span><\/td><td>String<\/span><\/td><\/tr>\n<tr><td>10<\/span><\/td><td>Insertion Point X<\/td><td>\u63d2\u5165\u70b9 X \u5750\u6807\uff08\u9ed8\u8ba4\u5728\u5de6\u7aef\u57fa\u7ebf\uff09<\/span>Insertion point X (default at left baseline)<\/span><\/td><td>Double<\/span><\/td><\/tr>\n<tr><td>20<\/span><\/td><td>Insertion Point Y<\/td><td>\u63d2\u5165\u70b9 Y \u5750\u6807<\/span>Insertion point Y<\/span><\/td><td>Double<\/span><\/td><\/tr>\n<tr><td>30<\/span><\/td><td>Insertion Point Z<\/td><td>\u63d2\u5165\u70b9 Z \u5750\u6807\uff08\u53ef\u7701\u7565\uff0c\u9ed8\u8ba4 0\uff09<\/span>Insertion point Z (optional, default 0)<\/span><\/td><td>Double<\/span><\/td><\/tr>\n<tr><td>40<\/span><\/td><td>Text Height<\/td><td>\u6587\u5b57\u9ad8\u5ea6\uff08\u6cbf\u57fa\u7ebf\u5230 ascent \u7684\u8ddd\u79bb\uff09<\/span>Text height (baseline to ascent distance)<\/span><\/td><td>Double<\/span><\/td><\/tr>\n<tr><td>41<\/span><\/td><td>Relative X Scale Factor<\/td><td>X \u65b9\u5411\u5bbd\u5ea6\u6bd4\u4f8b\u56e0\u5b50\uff08\u9ed8\u8ba4 1.0\uff09<\/span>X scale factor (default 1.0)<\/span><\/td><td>Double<\/span><\/td><\/tr>\n<tr><td>50<\/span><\/td><td>Rotation Angle<\/td><td>\u65cb\u8f6c\u89d2\u5ea6\uff08\u5ea6\uff0c\u7ed5\u63d2\u5165\u70b9\u9006\u65f6\u9488\uff09<\/span>Rotation angle in degrees (CCW around insert point)<\/span><\/td><td>Double<\/span><\/td><\/tr>\n<tr><td>51<\/span><\/td><td>Oblique Angle<\/td><td>\u503e\u659c\u89d2\u5ea6\uff08\u5ea6\uff0c\u7528\u4e8e\u659c\u4f53\u5b57\uff09<\/span>Oblique angle in degrees (for italic effect)<\/span><\/td><td>Double<\/span><\/td><\/tr>\n<tr><td>7<\/span><\/td><td>Text Style Name<\/td><td>\u6587\u5b57\u6837\u5f0f\u540d\u79f0\uff08\u5982 “Standard”\uff09<\/span>Text style name (e.g. “Standard”)<\/span><\/td><td>String<\/span><\/td><\/tr>\n<tr><td>71<\/span><\/td><td>Text Generation Flags<\/td><td>\u6587\u5b57\u751f\u6210\u6807\u5fd7\uff082=\u5012\u7f6e, 4=\u53cd\u5411\uff09<\/span>Text generation flags (2=upside-down, 4=backwards)<\/span><\/td><td>Int16<\/span><\/td><\/tr>\n<tr><td>72<\/span><\/td><td>Horizontal Alignment<\/td><td>\u6c34\u5e73\u5bf9\u9f50\u65b9\u5f0f\uff08halign\uff09<\/span>Horizontal alignment (halign)<\/span><\/td><td>Int16<\/span><\/td><\/tr>\n<tr><td>73<\/span><\/td><td>Vertical Alignment<\/td><td>\u5782\u76f4\u5bf9\u9f50\u65b9\u5f0f\uff08valign\uff09<\/span>Vertical alignment (valign)<\/span><\/td><td>Int16<\/span><\/td><\/tr>\n<tr><td>11<\/span><\/td><td>Alignment Point X<\/td><td>\u5bf9\u9f50\u70b9 X\uff08\u5f53 halign\/valign \u975e\u9ed8\u8ba4\u65f6\u6709\u6548\uff09<\/span>Alignment point X (used when halign\/valign non-default)<\/span><\/td><td>Double<\/span><\/td><\/tr>\n<tr><td>21<\/span><\/td><td>Alignment Point Y<\/td><td>\u5bf9\u9f50\u70b9 Y<\/span>Alignment point Y<\/span><\/td><td>Double<\/span><\/td><\/tr>\n<tr><td>31<\/span><\/td><td>Alignment Point Z<\/td><td>\u5bf9\u9f50\u70b9 Z<\/span>Alignment point Z<\/span><\/td><td>Double<\/span><\/td><\/tr>\n<tr><td>210<\/span><\/td><td>Extrusion X<\/td><td>\u62c9\u4f38\u65b9\u5411 X\uff08\u5b9a\u4e49\u6587\u5b57\u6240\u5728\u5e73\u9762\uff09<\/span>Extrusion direction X (defines text plane)<\/span><\/td><td>Double<\/span><\/td><\/tr>\n<tr><td>220<\/span><\/td><td>Extrusion Y<\/td><td>\u62c9\u4f38\u65b9\u5411 Y<\/span>Extrusion direction Y<\/span><\/td><td>Double<\/span><\/td><\/tr>\n<tr><td>230<\/span><\/td><td>Extrusion Z<\/td><td>\u62c9\u4f38\u65b9\u5411 Z\uff08\u9ed8\u8ba4 0,0,1 \u5373 XY \u5e73\u9762\uff09<\/span>Extrusion direction Z (default 0,0,1 = XY plane)<\/span><\/td><td>Double<\/span><\/td><\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n\n<h3>TEXT \u6c34\u5e73\u5bf9\u9f50\uff08halign\uff0c\u7ec4\u7801 72\uff09<\/span>TEXT Horizontal Alignment (halign, code 72)<\/span><\/h3>\n<div class=\"table-wrap\">\n<table>\n<thead>\n<tr>\n<th>\u53d6\u503c<\/span>Value<\/span><\/th>\n<th>\u4e2d\u6587\u540d\u79f0<\/span>Name<\/span><\/th>\n<th>\u63d2\u5165\u70b9\u4f4d\u7f6e\u8bf4\u660e<\/span>Insertion Point Description<\/span><\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr><td>0<\/span><\/td><td>\u5de6\u5bf9\u9f50\uff08\u9ed8\u8ba4\uff09<\/span>Left (default)<\/span><\/td><td>\u6587\u5b57\u5de6\u7aef\u4f4d\u4e8e\u63d2\u5165\u70b9<\/span>Left end of text at insertion point<\/span><\/td><\/tr>\n<tr><td>1<\/span><\/td><td>\u5c45\u4e2d\u5bf9\u9f50<\/span>Center<\/span><\/td><td>\u6587\u5b57\u6c34\u5e73\u4e2d\u5fc3\u4f4d\u4e8e\u63d2\u5165\u70b9<\/span>Horizontal center of text at insertion point<\/span><\/td><\/tr>\n<tr><td>2<\/span><\/td><td>\u53f3\u5bf9\u9f50<\/span>Right<\/span><\/td><td>\u6587\u5b57\u53f3\u7aef\u4f4d\u4e8e\u63d2\u5165\u70b9<\/span>Right end of text at insertion point<\/span><\/td><\/tr>\n<tr><td>3<\/span><\/td><td>\u5bf9\u9f50\uff08Aligned\uff09<\/span>Aligned<\/span><\/td><td>\u6587\u5b57\u4e24\u7aef\u5206\u522b\u5bf9\u9f50\u5230\u4e24\u4e2a\u70b9\uff0c\u9ad8\u5ea6\u81ea\u52a8\u8c03\u6574<\/span>Text stretched between two points, height auto-adjusted<\/span><\/td><\/tr>\n<tr><td>4<\/span><\/td><td>\u5e03\u6ee1\uff08Fit\uff09<\/span>Fit<\/span><\/td><td>\u6587\u5b57\u4e24\u7aef\u5206\u522b\u5bf9\u9f50\u5230\u4e24\u4e2a\u70b9\uff0c\u9ad8\u5ea6\u4e0d\u53d8<\/span>Text fitted between two points, height fixed<\/span><\/td><\/tr>\n<tr><td>5<\/span><\/td><td>\u57fa\u7ebf\u5c45\u4e2d\u5bf9\u9f50<\/span>Baseline Center<\/span><\/td><td>\u57fa\u7ebf\u4e2d\u70b9\u4f4d\u4e8e\u63d2\u5165\u70b9\uff08\u4e0e 1 \u7c7b\u4f3c\u4f46\u5b9a\u4f4d\u5728\u57fa\u7ebf\uff09<\/span>Baseline midpoint at insertion point<\/span><\/td><\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n\n<h3>TEXT \u5782\u76f4\u5bf9\u9f50\uff08valign\uff0c\u7ec4\u7801 73\uff09<\/span>TEXT Vertical Alignment (valign, code 73)<\/span><\/h3>\n<div class=\"table-wrap\">\n<table>\n<thead>\n<tr>\n<th>\u53d6\u503c<\/span>Value<\/span><\/th>\n<th>\u4e2d\u6587\u540d\u79f0<\/span>Name<\/span><\/th>\n<th>\u63d2\u5165\u70b9\u4f4d\u7f6e\u8bf4\u660e<\/span>Insertion Point Description<\/span><\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr><td>0<\/span><\/td><td>\u57fa\u7ebf\u5bf9\u9f50\uff08\u9ed8\u8ba4\uff09<\/span>Baseline (default)<\/span><\/td><td>\u63d2\u5165\u70b9\u4f4d\u4e8e\u6587\u5b57\u57fa\u7ebf<\/span>Insertion point on text baseline<\/span><\/td><\/tr>\n<tr><td>1<\/span><\/td><td>\u5e95\u90e8\u5bf9\u9f50<\/span>Bottom<\/span><\/td><td>\u63d2\u5165\u70b9\u4f4d\u4e8e\u6587\u5b57\u6700\u5e95\u90e8\uff08\u542b\u4e0b\u4f38\u90e8\uff09<\/span>Insertion point at text bottom (including descenders)<\/span><\/td><\/tr>\n<tr><td>2<\/span><\/td><td>\u5c45\u4e2d\u5bf9\u9f50<\/span>Middle<\/span><\/td><td>\u63d2\u5165\u70b9\u4f4d\u4e8e\u6587\u5b57\u5782\u76f4\u4e2d\u5fc3<\/span>Insertion point at vertical center<\/span><\/td><\/tr>\n<tr><td>3<\/span><\/td><td>\u9876\u90e8\u5bf9\u9f50<\/span>Top<\/span><\/td><td>\u63d2\u5165\u70b9\u4f4d\u4e8e\u6587\u5b57\u6700\u9876\u90e8<\/span>Insertion point at text top<\/span><\/td><\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n\n<div class=\"tip-box\">\n\u5bf9\u9f50\u70b9\uff08\u7ec4\u7801 11\/21\/31\uff09<\/span>Alignment Point (codes 11\/21\/31)<\/span><\/strong><br\/>\n\u5f53 halign \u6216 valign \u4e0d\u4e3a 0\uff08\u9ed8\u8ba4\u503c\uff09\u65f6\uff0c\u7ec4\u7801 11\/21\/31 \u5b9a\u4e49\u7684\u6587\u5b57\u5bf9\u9f50\u70b9\u751f\u6548\uff0c\u800c\u7ec4\u7801 10\/20\/30 \u7684\u63d2\u5165\u70b9\u4ec5\u7528\u4e8e\u5b9a\u4f4d\u3002\u82e5 halign=0 \u4e14 valign=0\uff0c\u5219\u5bf9\u9f50\u70b9\u4e0e\u63d2\u5165\u70b9\u91cd\u5408\u3002<\/span>\nWhen halign or valign is non-zero, the alignment point (codes 11\/21\/31) takes effect, while codes 10\/20\/30 serve only for positioning. If both are 0, the alignment point coincides with the insertion point.<\/span>\n<\/div>\n<\/section>\n\n\n<section id=\"mtext-entity\">\n<div class=\"section-icon\">\ud83d\udcc4<\/div>\n<h2>MTEXT \u5b9e\u4f53\u8be6\u89e3<\/span>MTEXT Entity in Detail<\/span><\/h2>\n\n<code>MTEXT<\/code>\uff08\u591a\u884c\u6587\u5b57\uff09\u662f\u529f\u80fd\u66f4\u5f3a\u5927\u7684\u6587\u5b57\u5b9e\u4f53\uff0c\u652f\u6301\u591a\u884c\u663e\u793a\u3001\u5185\u5d4c\u683c\u5f0f\u4ee3\u7801\u3001\u6bb5\u843d\u8bbe\u7f6e\u548c\u5206\u680f\u3002\u5b83\u7684\u5bf9\u9f50\u65b9\u5f0f\u7531\u5355\u4e00\u7684 <code>attachment_point<\/code> \u5b57\u6bb5\u63a7\u5236\u3002<\/span><code>MTEXT<\/code> (multiline text) is a more powerful entity supporting multiple lines, inline format codes, paragraph settings, and columns. Its alignment is controlled by a single <code>attachment_point<\/code> field.<\/span><\/p>\n\n<h3>MTEXT \u4e13\u5c5e\u7ec4\u7801<\/span>MTEXT-Specific Group Codes<\/span><\/h3>\n<div class=\"table-wrap\">\n<table>\n<thead>\n<tr>\n<th>\u7ec4\u7801<\/span>Code<\/span><\/th>\n<th>\u5b57\u6bb5\u540d<\/span>Field Name<\/span><\/th>\n<th>\u4e2d\u6587\u8bf4\u660e<\/span>Description<\/span><\/th>\n<th>\u7c7b\u578b<\/span>Type<\/span><\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr><td>1<\/span><\/td><td>Text Content<\/td><td>\u6587\u5b57\u5185\u5bb9\uff08\u542b\u683c\u5f0f\u4ee3\u7801\uff0c\u5982 \\Hxxx; \u63a7\u5236\u9ad8\u5ea6\uff09<\/span>Text content (with format codes like \\Hxxx; for height)<\/span><\/td><td>String<\/span><\/td><\/tr>\n<tr><td>3<\/span><\/td><td>Additional Text<\/td><td>\u9644\u52a0\u6587\u5b57\uff08\u5185\u5bb9\u8d85\u957f\u65f6\u7eed\u63a5\uff0c\u53ef\u591a\u4e2a\u7ec4\u7801 3\uff09<\/span>Additional text (continuation when content is long, multiple code 3 allowed)<\/span><\/td><td>String<\/span><\/td><\/tr>\n<tr><td>10<\/span><\/td><td>Insertion Point X<\/td><td>\u63d2\u5165\u70b9 X\uff08\u9ed8\u8ba4\u5de6\u4e0a\u89d2\uff09<\/span>Insertion point X (default top-left)<\/span><\/td><td>Double<\/span><\/td><\/tr>\n<tr><td>20<\/span><\/td><td>Insertion Point Y<\/td><td>\u63d2\u5165\u70b9 Y<\/span>Insertion point Y<\/span><\/td><td>Double<\/span><\/td><\/tr>\n<tr><td>30<\/span><\/td><td>Insertion Point Z<\/td><td>\u63d2\u5165\u70b9 Z<\/span>Insertion point Z<\/span><\/td><td>Double<\/span><\/td><\/tr>\n<tr><td>40<\/span><\/td><td>Nominal Text Height<\/td><td>\u6807\u79f0\u6587\u5b57\u9ad8\u5ea6\uff08\u9ed8\u8ba4\u884c\u9ad8\uff09<\/span>Nominal text height (default line height)<\/span><\/td><td>Double<\/span><\/td><\/tr>\n<tr><td>41<\/span><\/td><td>Reference Rectangle Width<\/td><td>\u53c2\u8003\u77e9\u5f62\u5bbd\u5ea6\uff08\u81ea\u52a8\u6362\u884c\u7684\u8fb9\u754c\u5bbd\u5ea6\uff0c0=\u4e0d\u6362\u884c\uff09<\/span>Reference rectangle width (wrap boundary, 0=no wrapping)<\/span><\/td><td>Double<\/span><\/td><\/tr>\n<tr><td>42<\/span><\/td><td>Reference Rectangle Height<\/td><td>\u53c2\u8003\u77e9\u5f62\u9ad8\u5ea6<\/span>Reference rectangle height<\/span><\/td><td>Double<\/span><\/td><\/tr>\n<tr><td>43<\/span><\/td><td>Actual Rectangle Height<\/td><td>\u5b9e\u9645\u77e9\u5f62\u9ad8\u5ea6\uff08DXF \u8f93\u51fa\u65f6\u586b\u5145\uff09<\/span>Actual rectangle height (filled on DXF output)<\/span><\/td><td>Double<\/span><\/td><\/tr>\n<tr><td>50<\/span><\/td><td>Rotation Angle<\/td><td>\u65cb\u8f6c\u89d2\u5ea6\uff08\u5ea6\uff09<\/span>Rotation angle in degrees<\/span><\/td><td>Double<\/span><\/td><\/tr>\n<tr><td>71<\/span><\/td><td>Attachment Point<\/td><td>\u9644\u7740\u70b9 \/ \u5bf9\u9f50\u65b9\u5f0f\uff081~9\uff0c\u89c1\u4e0b\u8868\uff09<\/span>Attachment point \/ alignment (1-9, see table below)<\/span><\/td><td>Int16<\/span><\/td><\/tr>\n<tr><td>72<\/span><\/td><td>Drawing Direction<\/td><td>\u6587\u5b57\u7ed8\u5236\u65b9\u5411\uff081=\u5de6\u5230\u53f3, 3=\u4e0a\u5230\u4e0b, 5=\u53f3\u5230\u5de6\uff09<\/span>Drawing direction (1=L-R, 3=T-B, 5=R-L)<\/span><\/td><td>Int16<\/span><\/td><\/tr>\n<tr><td>73<\/span><\/td><td>Line Spacing Style<\/td><td>\u884c\u95f4\u8ddd\u6837\u5f0f\uff081=\u81f3\u5c11, 2=\u7cbe\u786e\uff09<\/span>Line spacing style (1=at least, 2=exact)<\/span><\/td><td>Int16<\/span><\/td><\/tr>\n<tr><td>44<\/span><\/td><td>Line Spacing Factor<\/td><td>\u884c\u95f4\u8ddd\u6bd4\u4f8b\u56e0\u5b50\uff08\u57fa\u4e8e\u6587\u5b57\u9ad8\u5ea6\u7684\u500d\u6570\uff09<\/span>Line spacing factor (multiple of text height)<\/span><\/td><td>Double<\/span><\/td><\/tr>\n<tr><td>7<\/span><\/td><td>Text Style Name<\/td><td>\u6587\u5b57\u6837\u5f0f\u540d\u79f0<\/span>Text style name<\/span><\/td><td>String<\/span><\/td><\/tr>\n<tr><td>90<\/span><\/td><td>Column Type<\/td><td>\u5206\u680f\u7c7b\u578b\uff080=\u65e0, 1=\u9759\u6001, 2=\u52a8\u6001\uff0cR2018+\uff09<\/span>Column type (0=none, 1=static, 2=dynamic, R2018+)<\/span><\/td><td>Int32<\/span><\/td><\/tr>\n<tr><td>210<\/span><\/td><td>Extrusion X<\/td><td>\u62c9\u4f38\u65b9\u5411 X<\/span>Extrusion direction X<\/span><\/td><td>Double<\/span><\/td><\/tr>\n<tr><td>220<\/span><\/td><td>Extrusion Y<\/td><td>\u62c9\u4f38\u65b9\u5411 Y<\/span>Extrusion direction Y<\/span><\/td><td>Double<\/span><\/td><\/tr>\n<tr><td>230<\/span><\/td><td>Extrusion Z<\/td><td>\u62c9\u4f38\u65b9\u5411 Z<\/span>Extrusion direction Z<\/span><\/td><td>Double<\/span><\/td><\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n\n<h3>MTEXT \u9644\u7740\u70b9\uff08attachment_point\uff0c\u7ec4\u7801 71\uff09<\/span>MTEXT Attachment Point (code 71)<\/span><\/h3>\nMTEXT \u7684 <code>attachment_point<\/code> \u7528\u5355\u4e2a\u6570\u503c 1~9 \u8868\u793a\u4e5d\u5bab\u683c\u4f4d\u7f6e\uff0c\u540c\u65f6\u63a7\u5236\u6c34\u5e73\u548c\u5782\u76f4\u5bf9\u9f50\uff1a<\/span>MTEXT’s <code>attachment_point<\/code> uses a single value 1-9 to represent a 3×3 grid position, controlling both horizontal and vertical alignment simultaneously:<\/span><\/p>\n\n<div class=\"diagram-area\">\n <div class=\"diagram-title\">MTEXT \u9644\u7740\u70b9\u4e5d\u5bab\u683c\uff08\u7ec4\u7801 71\uff09<\/span>MTEXT Attachment Point Grid (code 71)<\/span><\/div>\n <div class=\"attachment-grid\">\n <div class=\"attachment-cell\">3<\/span>\u53f3\u4e0a<\/span>TR<\/span><\/div>\n <div class=\"attachment-cell\">2<\/span>\u4e0a\u4e2d<\/span>TC<\/span><\/div>\n <div class=\"attachment-cell\">1<\/span>TL<\/span>\u5de6\u4e0a<\/span><\/div>\n <div class=\"attachment-cell\">6<\/span>\u53f3\u4e2d<\/span>MR<\/span><\/div>\n <div class=\"attachment-cell\">5<\/span>\u6b63\u4e2d<\/span>MC<\/span><\/div>\n <div class=\"attachment-cell\">4<\/span>\u5de6\u4e2d<\/span>ML<\/span><\/div>\n <div class=\"attachment-cell\">9<\/span>\u53f3\u4e0b<\/span>BR<\/span><\/div>\n <div class=\"attachment-cell\">8<\/span>\u4e0b\u4e2d<\/span>BC<\/span><\/div>\n <div class=\"attachment-cell default\">7<\/span>\u5de6\u4e0b<\/span>BL<\/span><\/div>\n <\/div>\n \u7eff\u8272\u8fb9\u6846 = \u9ed8\u8ba4\u9644\u7740\u70b9\uff08\u5de6\u4e0a\u89d2\u5728 DXF \u4e2d\u8bb0\u4e3a 1\uff0c\u4f46\u5728\u4e0a\u56fe\u4e2d\u4e3a\u4e86\u7b26\u5408\u89c6\u89c9\u4e60\u60ef\u5c06 1 \u653e\u5728\u5de6\u4e0a\uff1b\u6ce8\u610f\uff1a\u6807\u51c6 DXF \u6587\u6863\u4e2d 1=\u5de6\u4e0a, 2=\u4e0a\u4e2d, 3=\u53f3\u4e0a, 4=\u5de6\u4e2d, 5=\u6b63\u4e2d, 6=\u53f3\u4e2d, 7=\u5de6\u4e0b, 8=\u4e0b\u4e2d, 9=\u53f3\u4e0b\uff09<\/span>Green border = default attachment point. In standard DXF: 1=Top-Left, 2=Top-Center, 3=Top-Right, 4=Middle-Left, 5=Middle-Center, 6=Middle-Right, 7=Bottom-Left, 8=Bottom-Center, 9=Bottom-Right.<\/span><\/p>\n<\/div>\n\n<div class=\"table-wrap\">\n<table>\n<thead>\n<tr>\n<th>\u53d6\u503c<\/span>Value<\/span><\/th>\n<th>\u82f1\u6587\u7f29\u5199<\/span>Abbreviation<\/span><\/th>\n<th>\u4e2d\u6587\u540d\u79f0<\/span>Name<\/span><\/th>\n<th>\u63d2\u5165\u70b9\u76f8\u5bf9\u4f4d\u7f6e<\/span>Relative Position<\/span><\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr><td>1<\/span><\/td><td>TL<\/td><td>\u5de6\u4e0a\u89d2\uff08\u9ed8\u8ba4\uff09<\/span>Top-Left (default)<\/span><\/td><td>\u6587\u5b57\u6846\u5de6\u4e0a\u89d2\u4f4d\u4e8e\u63d2\u5165\u70b9<\/span>Text box top-left at insertion point<\/span><\/td><\/tr>\n<tr><td>2<\/span><\/td><td>TC<\/td><td>\u4e0a\u4e2d<\/span>Top-Center<\/span><\/td><td>\u6587\u5b57\u6846\u4e0a\u8fb9\u4e2d\u70b9\u4f4d\u4e8e\u63d2\u5165\u70b9<\/span>Text box top-center at insertion point<\/span><\/td><\/tr>\n<tr><td>3<\/span><\/td><td>TR<\/td><td>\u53f3\u4e0a\u89d2<\/span>Top-Right<\/span><\/td><td>\u6587\u5b57\u6846\u53f3\u4e0a\u89d2\u4f4d\u4e8e\u63d2\u5165\u70b9<\/span>Text box top-right at insertion point<\/span><\/td><\/tr>\n<tr><td>4<\/span><\/td><td>ML<\/td><td>\u5de6\u4e2d<\/span>Middle-Left<\/span><\/td><td>\u6587\u5b57\u6846\u5de6\u8fb9\u4e2d\u70b9\u4f4d\u4e8e\u63d2\u5165\u70b9<\/span>Text box middle-left at insertion point<\/span><\/td><\/tr>\n<tr><td>5<\/span><\/td><td>MC<\/td><td>\u6b63\u4e2d\u5fc3<\/span>Middle-Center<\/span><\/td><td>\u6587\u5b57\u6846\u51e0\u4f55\u4e2d\u5fc3\u4f4d\u4e8e\u63d2\u5165\u70b9<\/span>Text box geometric center at insertion point<\/span><\/td><\/tr>\n<tr><td>6<\/span><\/td><td>MR<\/td><td>\u53f3\u4e2d<\/span>Middle-Right<\/span><\/td><td>\u6587\u5b57\u6846\u53f3\u8fb9\u4e2d\u70b9\u4f4d\u4e8e\u63d2\u5165\u70b9<\/span>Text box middle-right at insertion point<\/span><\/td><\/tr>\n<tr><td>7<\/span><\/td><td>BL<\/td><td>\u5de6\u4e0b\u89d2<\/span>Bottom-Left<\/span><\/td><td>\u6587\u5b57\u6846\u5de6\u4e0b\u89d2\u4f4d\u4e8e\u63d2\u5165\u70b9<\/span>Text box bottom-left at insertion point<\/span><\/td><\/tr>\n<tr><td>8<\/span><\/td><td>BC<\/td><td>\u4e0b\u4e2d<\/span>Bottom-Center<\/span><\/td><td>\u6587\u5b57\u6846\u4e0b\u8fb9\u4e2d\u70b9\u4f4d\u4e8e\u63d2\u5165\u70b9<\/span>Text box bottom-center at insertion point<\/span><\/td><\/tr>\n<tr><td>9<\/span><\/td><td>BR<\/td><td>\u53f3\u4e0b\u89d2<\/span>Bottom-Right<\/span><\/td><td>\u6587\u5b57\u6846\u53f3\u4e0b\u89d2\u4f4d\u4e8e\u63d2\u5165\u70b9<\/span>Text box bottom-right at insertion point<\/span><\/td><\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n\n<div class=\"warn-box\">\n\u91cd\u8981\u533a\u5206<\/span>Important Distinction<\/span><\/strong><br\/>\nMTEXT \u6ca1\u6709<\/strong> <code>halign<\/code> \u548c <code>valign<\/code> \u5c5e\u6027\u3002\u82e5\u4f60\u7684\u4ee3\u7801\u540c\u65f6\u904d\u5386 TEXT \u548c MTEXT\uff0c\u8bfb\u53d6 <code>entity.dxf.halign<\/code> \u65f6\u9047\u5230 MTEXT \u4f1a\u629b\u51fa AttributeError\u3002\u5fc5\u987b\u5148\u5224\u65ad\u5b9e\u4f53\u7c7b\u578b\uff1a<code>entity.dxftype() == 'TEXT'<\/code> \u65f6\u624d\u8bfb\u53d6 halign\/valign\u3002<\/span>\nMTEXT does not have<\/strong> <code>halign<\/code> and <code>valign<\/code> attributes. If your code iterates over both TEXT and MTEXT, reading <code>entity.dxf.halign<\/code> on an MTEXT will raise AttributeError. Always check entity type first: only read halign\/valign when <code>entity.dxftype() == 'TEXT'<\/code>.<\/span>\n<\/div>\n<\/section>\n\n\n<section id=\"alignment\">\n<div class=\"section-icon\">\ud83c\udfaf<\/div>\n<h2>\u5bf9\u9f50\u673a\u5236\u5bf9\u6bd4\u603b\u8868<\/span>Alignment Mechanism Comparison<\/span><\/h2>\n\n<h3>TEXT \u5bf9\u9f50\u7ec4\u5408\u8868<\/span>TEXT Alignment Combination<\/span><\/h3>\n<div class=\"table-wrap\">\n<table>\n<thead>\n<tr>\n<th>\u6c34\u5e73\u5bf9\u9f50 halign<\/span>halign (code 72)<\/span><\/th>\n<th>\u53d6\u503c<\/span>Value<\/span><\/th>\n<th>\u5782\u76f4\u5bf9\u9f50 valign<\/span>valign (code 73)<\/span><\/th>\n<th>\u53d6\u503c<\/span>Value<\/span><\/th>\n<th>\u63d2\u5165\u70b9\u5b9e\u9645\u4f4d\u7f6e<\/span>Insertion Point Location<\/span><\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>\u5de6\u5bf9\u9f50\uff08\u9ed8\u8ba4\uff09<\/span>Left (default)<\/span><\/td><td>0<\/span><\/td>\n<td>\u57fa\u7ebf\u5bf9\u9f50\uff08\u9ed8\u8ba4\uff09<\/span>Baseline (default)<\/span><\/td><td>0<\/span><\/td>\n<td>\u6587\u5b57\u5de6\u7aef\u57fa\u7ebf\u5904\uff08\u8fd1\u4f3c\u5de6\u4e0b\u89d2\uff09<\/span>Left end of baseline (approx. lower-left)<\/span><\/td>\n<\/tr>\n<tr>\n<td>\u5c45\u4e2d\u5bf9\u9f50<\/span>Center<\/span><\/td><td>1<\/span><\/td>\n<td>\u5e95\u90e8\u5bf9\u9f50<\/span>Bottom<\/span><\/td><td>1<\/span><\/td>\n<td>\u6587\u5b57\u6c34\u5e73\u4e2d\u5fc3 \u00d7 \u6700\u5e95\u90e8<\/span>Horizontal center \u00d7 bottom<\/span><\/td>\n<\/tr>\n<tr>\n<td>\u53f3\u5bf9\u9f50<\/span>Right<\/span><\/td><td>2<\/span><\/td>\n<td>\u5c45\u4e2d\u5bf9\u9f50<\/span>Middle<\/span><\/td><td>2<\/span><\/td>\n<td>\u6587\u5b57\u53f3\u7aef \u00d7 \u5782\u76f4\u4e2d\u5fc3<\/span>Right end \u00d7 vertical center<\/span><\/td>\n<\/tr>\n<tr>\n<td>\u5bf9\u9f50\uff08Aligned\uff09<\/span>Aligned<\/span><\/td><td>3<\/span><\/td>\n<td>\u9876\u90e8\u5bf9\u9f50<\/span>Top<\/span><\/td><td>3<\/span><\/td>\n<td>\u4e24\u7aef\u62c9\u4f38\u81f3\u6307\u5b9a\u5bbd\u5ea6\uff0c\u9ad8\u5ea6\u81ea\u52a8<\/span>Stretched to width, height auto<\/span><\/td>\n<\/tr>\n<tr>\n<td>\u5e03\u6ee1\uff08Fit\uff09<\/span>Fit<\/span><\/td><td>4<\/span><\/td>\n<td>–<\/td><td>–<\/td>\n<td>\u4e24\u7aef\u5bf9\u9f50\u81f3\u6307\u5b9a\u5bbd\u5ea6\uff0c\u9ad8\u5ea6\u56fa\u5b9a<\/span>Fitted to width, height fixed<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n\n<h3>\u9ed8\u8ba4\u57fa\u51c6\u70b9\u5bf9\u6bd4<\/span>Default Anchor Point Comparison<\/span><\/h3>\n<div class=\"compare-grid\">\n<div class=\"compare-card\">\n<h4>TEXT<\/h4>\n\u9ed8\u8ba4\u63d2\u5165\u70b9\uff1a<\/strong>\u5de6\u7aef\u57fa\u7ebf\u5904<\/span>Default insertion:<\/strong> Left end of baseline<\/span><\/p>\n\u6587\u5b57\u5411\u53f3\u5ef6\u4f38\uff0c\u5b57\u7b26\u5750\u843d\u5728\u57fa\u7ebf\u4e0a\u3002\u4e0b\u4f38\u90e8\uff08g, p, y\uff09\u4f1a\u5411\u4e0b\u8d85\u51fa\u63d2\u5165\u70b9\u3002<\/span>Text extends to the right, characters sit on baseline. Descenders (g, p, y) extend below insertion point.<\/span><\/p>\n\u5bf9\u9f50\u5b57\u6bb5\uff1a<\/strong>halign (72) + valign (73)<\/span>Alignment fields:<\/strong> halign (72) + valign (73)<\/span><\/p>\n<\/div>\n<div class=\"compare-card\">\n<h4>MTEXT<\/h4>\n\u9ed8\u8ba4\u63d2\u5165\u70b9\uff1a<\/strong>\u5de6\u4e0a\u89d2<\/span>Default insertion:<\/strong> Top-left corner<\/span><\/p>\n\u6587\u5b57\u6846\u5411\u53f3\u4e0b\u65b9\u6269\u5c55\u3002\u63d2\u5165\u70b9\u59cb\u7ec8\u4f4d\u4e8e\u6587\u5b57\u6846\u7684\u8fb9\u754c\u4e0a\uff08\u7531 attachment_point \u51b3\u5b9a\u5177\u4f53\u54ea\u4e2a\u89d2\/\u8fb9\uff09\u3002<\/span>Text box expands right and down. Insertion point is always on the text box boundary (specific corner\/edge determined by attachment_point).<\/span><\/p>\n\u5bf9\u9f50\u5b57\u6bb5\uff1a<\/strong>attachment_point (71)<\/span>Alignment field:<\/strong> attachment_point (71)<\/span><\/p>\n<\/div>\n<\/div>\n<\/section>\n\n\n<section id=\"bbox\">\n<div class=\"section-icon\">\ud83d\udcd0<\/div>\n<h2>\u5982\u4f55\u7406\u89e3 BBox\uff08\u8fb9\u754c\u6846\uff09<\/span>Understanding BBox (Bounding Box)<\/span><\/h2>\n\n\u5728 CAD \u7f16\u7a0b\u4e2d\uff0cBBox<\/strong>\uff08Bounding Box\uff0c\u8fb9\u754c\u6846\uff09\u662f\u6307\u80fd\u591f\u5b8c\u5168\u5305\u56f4\u4e00\u4e2a\u5b9e\u4f53\u7684\u6700\u5c0f\u8f74\u5bf9\u9f50\u77e9\u5f62\u3002\u5bf9\u4e8e\u6587\u5b57\u5b9e\u4f53\uff0cBBox \u662f\u8ba1\u7b97\u6587\u5b57\u6e32\u67d3\u540e\u7684\u5b9e\u9645\u5360\u636e\u7a7a\u95f4\u6240\u5f97\u5230\u7684\u77e9\u5f62\u3002<\/span>In CAD programming, BBox<\/strong> (Bounding Box) is the minimum axis-aligned rectangle that fully encloses an entity. For text entities, the BBox is calculated from the actual rendered space occupied by the text.<\/span><\/p>\n\n<h3>TEXT \u7684 BBox<\/span>TEXT BBox<\/span><\/h3>\nTEXT \u7684 BBox \u7531\u4ee5\u4e0b\u56e0\u7d20\u51b3\u5b9a\uff1a<\/span>TEXT’s BBox is determined by:<\/span><\/p>\n<ul style=\"margin-left:1.5rem;margin-bottom:1rem;\">\n<li>\u6587\u5b57\u5185\u5bb9<\/strong>\uff1a\u5b57\u7b26\u6570\u91cf\u51b3\u5b9a\u5bbd\u5ea6<\/span>Text content:<\/strong> character count determines width<\/span><\/li>\n<li>\u6587\u5b57\u9ad8\u5ea6<\/strong>\uff08\u7ec4\u7801 40\uff09\uff1a\u51b3\u5b9a\u4ece\u57fa\u7ebf\u5230 ascent \u7684\u8ddd\u79bb<\/span>Text height<\/strong> (code 40): determines baseline-to-ascent distance<\/span><\/li>\n<li>\u5bbd\u5ea6\u56e0\u5b50<\/strong>\uff08\u7ec4\u7801 41\uff09\uff1a\u6c34\u5e73\u7f29\u653e\u6bd4\u4f8b<\/span>Width factor<\/strong> (code 41): horizontal scale ratio<\/span><\/li>\n<li>\u503e\u659c\u89d2\u5ea6<\/strong>\uff08\u7ec4\u7801 51\uff09\uff1a\u4f7f BBox \u503e\u659c<\/span>Oblique angle<\/strong> (code 51): tilts the BBox<\/span><\/li>\n<li>\u65cb\u8f6c\u89d2\u5ea6<\/strong>\uff08\u7ec4\u7801 50\uff09\uff1a\u4f7f\u6574\u4e2a BBox \u7ed5\u63d2\u5165\u70b9\u65cb\u8f6c<\/span>Rotation angle<\/strong> (code 50): rotates entire BBox around insertion point<\/span><\/li>\n<li>\u6587\u5b57\u6837\u5f0f<\/strong>\uff1a\u4e0d\u540c\u5b57\u4f53\u7684\u5b57\u7b26\u5bbd\u5ea6\u4e0d\u540c<\/span>Text style:<\/strong> different fonts have different character widths<\/span><\/li>\n<\/ul>\n\n<div class=\"diagram-area\">\n <div class=\"diagram-title\">TEXT BBox \u793a\u610f\u56fe<\/span>TEXT BBox Diagram<\/span><\/div>\n <svg viewBox=\"0 0 500 160\" style=\"max-width:500px;width:100%;height:auto;\">\n \n <text x=\"80\" y=\"90\" font-family=\"serif\" font-size=\"50\" fill=\"#1a2e23\" transform=\"rotate(10 80 90)\">Hello<\/text>\n\n \n <rect x=\"75\" y=\"45\" width=\"160\" height=\"65\" fill=\"none\" stroke=\"#059669\" stroke-width=\"2\" stroke-dasharray=\"6,3\" transform=\"rotate(10 80 90)\"\/>\n\n \n <line x1=\"75\" y1=\"90\" x2=\"240\" y2=\"90\" stroke=\"#0d9488\" stroke-width=\"2\" transform=\"rotate(10 80 90)\"\/>\n <text x=\"250\" y=\"95\" font-size=\"11\" fill=\"#0d9488\" font-weight=\"bold\">Baseline<\/text>\n\n \n <circle cx=\"80\" cy=\"90\" r=\"4\" fill=\"#f97316\"\/>\n <text x=\"50\" y=\"105\" font-size=\"11\" fill=\"#f97316\" font-weight=\"bold\">Insert<\/text>\n\n \n <text x=\"320\" y=\"55\" font-size=\"11\" fill=\"#059669\" font-weight=\"bold\">BBox (min X, min Y)<\/text>\n <text x=\"320\" y=\"70\" font-size=\"11\" fill=\"#059669\" font-weight=\"bold\">to (max X, max Y)<\/text>\n <\/svg>\n<\/div>\n\n<h3>MTEXT \u7684 BBox<\/span>MTEXT BBox<\/span><\/h3>\nMTEXT \u7684 BBox \u66f4\u4e3a\u590d\u6742\uff0c\u56e0\u4e3a\uff1a<\/span>MTEXT’s BBox is more complex because:<\/span><\/p>\n<ul style=\"margin-left:1.5rem;margin-bottom:1rem;\">\n<li>\u5305\u542b\u591a\u884c\u6587\u5b57\uff0c\u9ad8\u5ea6\u7531\u884c\u6570\u548c\u884c\u95f4\u8ddd\u51b3\u5b9a<\/span>Contains multiple lines; height depends on line count and spacing<\/span><\/li>\n<li>\u6bcf\u884c\u53ef\u80fd\u6709\u4e0d\u540c\u683c\u5f0f\uff08\u9ad8\u5ea6\u3001\u5b57\u4f53\u3001\u989c\u8272\uff09\uff0c\u5bfc\u81f4\u5404\u884c\u9ad8\u5ea6\u4e0d\u540c<\/span>Each line may have different formatting (height, font, color), causing varying line heights<\/span><\/li>\n<li>\u81ea\u52a8\u6362\u884c\u4f7f\u5bbd\u5ea6\u53d7\u9650\u4e8e\u7ec4\u7801 41\uff08\u53c2\u8003\u77e9\u5f62\u5bbd\u5ea6\uff09<\/span>Automatic wrapping limits width to group code 41 (reference rectangle width)<\/span><\/li>\n<li>\u5185\u8fb9\u8ddd\u548c\u6bb5\u843d\u95f4\u8ddd\u4e5f\u4f1a\u8d21\u732e\u5230\u603b\u9ad8\u5ea6<\/span>Padding and paragraph spacing also contribute to total height<\/span><\/li>\n<\/ul>\n\n<div class=\"tip-box\">\nBBox \u7684\u8ba1\u7b97\u65b9\u5f0f<\/span>How BBox is Calculated<\/span><\/strong><br\/>\n\u5728 ezdxf \u7b49\u5e93\u4e2d\uff0c<code>entity.bbox()<\/code> \u6216 <code>entity.get_bbox()<\/code> \u901a\u5e38\u9700\u8981\u6e32\u67d3\u5f15\u64ce\u652f\u6301\uff08\u5982 matplotlib \u6216\u81ea\u5b9a\u4e49\u5b57\u4f53\u6d4b\u91cf\uff09\u3002\u5b83\u5e76\u975e\u76f4\u63a5\u8bfb\u53d6 DXF \u7ec4\u7801\uff0c\u800c\u662f\u6839\u636e\u5b57\u4f53\u6587\u4ef6\u52a8\u6001\u8ba1\u7b97\u6bcf\u4e2a\u5b57\u7b26\u7684\u8f6e\u5ed3\u540e\u53d6\u5e76\u96c6\u3002\u56e0\u6b64\uff0c\u6ca1\u6709\u5b57\u4f53\u6587\u4ef6\u65f6 BBox \u8ba1\u7b97\u53ef\u80fd\u4e0d\u51c6\u786e\u3002<\/span>\nIn libraries like ezdxf, <code>entity.bbox()<\/code> or <code>entity.get_bbox()<\/code> typically requires a rendering engine (like matplotlib or custom font metrics). It does not directly read DXF group codes but dynamically calculates each character’s outline from the font file and takes the union. Without the font file, BBox calculation may be inaccurate.<\/span>\n<\/div>\n\n<h3>BBox \u7684\u6570\u5b66\u8868\u8fbe<\/span>BBox Mathematical Expression<\/span><\/h3>\n<pre><code># \u4f2a\u4ee3\u7801\uff1aBBox \u7ed3\u6784\nclass BBox:\n min_x: float # \u5305\u56f4\u76d2\u5de6\u8fb9\u754c\n min_y: float # \u5305\u56f4\u76d2\u4e0b\u8fb9\u754c\n min_z: float # \u5305\u56f4\u76d2\u524d\u8fb9\u754c\uff08\u901a\u5e38\u6587\u5b57\u5728 XY \u5e73\u9762\uff0cZ=0\uff09\n max_x: float # \u5305\u56f4\u76d2\u53f3\u8fb9\u754c\n max_y: float # \u5305\u56f4\u76d2\u4e0a\u8fb9\u754c\n max_z: float # \u5305\u56f4\u76d2\u540e\u8fb9\u754c\n\n @property\n def width(self) -> float:\n return self.max_x - self.min_x\n\n @property\n def height(self) -> float:\n return self.max_y - self.min_y\n\n @property\n def center(self) -> Point:\n return Point(\n (self.min_x + self.max_x) \/ 2,\n (self.min_y + self.max_y) \/ 2,\n (self.min_z + self.max_z) \/ 2\n )\n<\/code><\/pre>\n<\/section>\n\n\n<section id=\"size-methods\">\n<div class=\"section-icon\">\ud83d\udccf<\/div>\n<h2>text_size \u4e0e mtext_size \u65b9\u6cd5<\/span>text_size and mtext_size Methods<\/span><\/h2>\n\n\u5728 CAD \u7f16\u7a0b\u5e93\uff08\u5982 ezdxf\uff09\u4e2d\uff0c<code>text_size<\/code> \u548c <code>mtext_size<\/code> \u662f\u7528\u4e8e\u8ba1\u7b97\u6587\u5b57\u5b9e\u4f53\u6e32\u67d3\u5c3a\u5bf8\u7684\u5de5\u5177\u51fd\u6570\u3002\u5b83\u4eec\u5e2e\u52a9\u5f00\u53d1\u8005\u9884\u4f30\u6587\u5b57\u5728\u56fe\u7eb8\u4e0a\u7684\u5b9e\u9645\u5360\u636e\u7a7a\u95f4\u3002<\/span>In CAD programming libraries (like ezdxf), <code>text_size<\/code> and <code>mtext_size<\/code> are utility functions for calculating the rendered size of text entities. They help developers estimate the actual space text occupies on the drawing.<\/span><\/p>\n\n<h3>text_size \u65b9\u6cd5<\/span>text_size Method<\/span><\/h3>\n<code>text_size<\/code> \u4e13\u95e8\u7528\u4e8e\u5355\u884c\u6587\u5b57\uff08TEXT \u5b9e\u4f53\uff09\uff0c\u5176\u8ba1\u7b97\u903b\u8f91\u76f8\u5bf9\u7b80\u5355\uff1a<\/span><code>text_size<\/code> is designed for single-line text (TEXT entities) with relatively simple calculation logic:<\/span><\/p>\n\n<pre><code># ezdxf \u98ce\u683c\u7684 text_size \u8ba1\u7b97\u903b\u8f91\uff08\u793a\u610f\uff09\ndef text_size(text_entity, font_info) -> Tuple[float, float]:\n \"\"\"\n \u8ba1\u7b97 TEXT \u5b9e\u4f53\u7684\u6e32\u67d3\u5bbd\u5ea6\u548c\u9ad8\u5ea6\u3002\n \u8fd4\u56de: (width, height)\n \"\"\"\n text = text_entity.dxf.text # \u7ec4\u7801 1\n height = text_entity.dxf.height # \u7ec4\u7801 40\n width_factor = text_entity.dxf.width # \u7ec4\u7801 41\uff08\u9ed8\u8ba4 1.0\uff09\n oblique = text_entity.dxf.oblique # \u7ec4\u7801 51\uff08\u503e\u659c\u89d2\uff09\n\n # 1. \u83b7\u53d6\u6bcf\u4e2a\u5b57\u7b26\u5728\u6307\u5b9a\u5b57\u4f53\u4e0b\u7684\u5bbd\u5ea6\n char_widths = [font_info.get_char_width(c) for c in text]\n base_width = sum(char_widths) * height * width_factor\n\n # 2. \u503e\u659c\u4f1a\u589e\u52a0\u6709\u6548\u5bbd\u5ea6\n if oblique != 0:\n base_width += height * abs(tan(radians(oblique)))\n\n # 3. \u9ad8\u5ea6 = \u6587\u5b57\u9ad8\u5ea6 + \u4e0b\u4f38\u90e8\uff08\u5982\u679c\u6709\uff09\n # \u6ce8\u610f\uff1a\u4e0d\u540c\u5b57\u4f53\u7684 ascent\/descent \u6bd4\u4f8b\u4e0d\u540c\n actual_height = height * font_info.ascent_ratio\n\n return (base_width, actual_height)\n<\/code><\/pre>\n\n<div class=\"info-box\">\ntext_size \u7684\u5173\u952e\u53c2\u6570<\/span>Key Parameters of text_size<\/span><\/strong><br\/>\n\n– \u6587\u5b57\u5185\u5bb9<\/strong>\uff1a\u76f4\u63a5\u5f71\u54cd\u5bbd\u5ea6<br\/>\n– \u6587\u5b57\u9ad8\u5ea6<\/strong>\uff08\u7ec4\u7801 40\uff09\uff1a\u57fa\u51c6\u9ad8\u5ea6\uff0c\u5b57\u7b26\u6309\u6bd4\u4f8b\u7f29\u653e<br\/>\n– \u5bbd\u5ea6\u56e0\u5b50<\/strong>\uff08\u7ec4\u7801 41\uff09\uff1a\u6c34\u5e73\u65b9\u5411\u7684\u989d\u5916\u7f29\u653e<br\/>\n– \u503e\u659c\u89d2\u5ea6<\/strong>\uff08\u7ec4\u7801 51\uff09\uff1a\u4f7f\u6587\u5b57\u503e\u659c\uff0c\u589e\u52a0\u6709\u6548\u5bbd\u5ea6\n<\/span>\n\n– Text content:<\/strong> directly affects width<br\/>\n– Text height<\/strong> (code 40): base height, characters scale proportionally<br\/>\n– Width factor<\/strong> (code 41): additional horizontal scaling<br\/>\n– Oblique angle<\/strong> (code 51): tilts text, increasing effective width\n<\/span>\n<\/div>\n\n<h3>mtext_size \u65b9\u6cd5<\/span>mtext_size Method<\/span><\/h3>\n<code>mtext_size<\/code> \u7528\u4e8e\u591a\u884c\u6587\u5b57\uff08MTEXT \u5b9e\u4f53\uff09\uff0c\u8ba1\u7b97\u66f4\u590d\u6742\uff0c\u9700\u8981\u89e3\u6790\u683c\u5f0f\u4ee3\u7801\uff1a<\/span><code>mtext_size<\/code> is for multiline text (MTEXT entities) and requires more complex calculation involving format code parsing:<\/span><\/p>\n\n<pre><code># ezdxf \u98ce\u683c\u7684 mtext_size \u8ba1\u7b97\u903b\u8f91\uff08\u793a\u610f\uff09\ndef mtext_size(mtext_entity, font_info) -> Tuple[float, float]:\n \"\"\"\n \u8ba1\u7b97 MTEXT \u5b9e\u4f53\u7684\u6e32\u67d3\u5bbd\u5ea6\u548c\u9ad8\u5ea6\u3002\n \u8fd4\u56de: (width, height)\n \"\"\"\n content = mtext_entity.text # \u7ec4\u7801 1 + 3 \u62fc\u63a5\n nominal_height = mtext_entity.dxf.height # \u7ec4\u7801 40\uff08\u6807\u79f0\u9ad8\u5ea6\uff09\n rect_width = mtext_entity.dxf.width # \u7ec4\u7801 41\uff08\u53c2\u8003\u5bbd\u5ea6\uff09\n line_spacing = mtext_entity.dxf.line_spacing_factor # \u7ec4\u7801 44\n\n # 1. \u89e3\u6790\u683c\u5f0f\u4ee3\u7801\uff08\u5982 \\H0.5x; \u8868\u793a\u9ad8\u5ea6\u4e3a\u6807\u79f0\u7684 0.5 \u500d\uff09\n formatted_lines = parse_mtext_formatting(content)\n\n # 2. \u9010\u884c\u8ba1\u7b97\u5c3a\u5bf8\n max_line_width = 0\n total_height = 0\n for i, line in enumerate(formatted_lines):\n line_height = line.get_height(nominal_height) # \u8003\u8651 \\H \u4ee3\u7801\n line_width = calculate_line_width(line, font_info, line_height)\n max_line_width = max(max_line_width, line_width)\n\n # \u9996\u884c\u4e0d\u52a0\u95f4\u8ddd\uff0c\u540e\u7eed\u884c\u52a0\u884c\u95f4\u8ddd\n if i > 0:\n total_height += line_height * line_spacing\n else:\n total_height += line_height\n\n # 3. \u5982\u679c\u8bbe\u5b9a\u4e86\u53c2\u8003\u5bbd\u5ea6\uff0c\u5b9e\u9645\u5bbd\u5ea6 = min(\u5185\u5bb9\u5bbd\u5ea6, \u53c2\u8003\u5bbd\u5ea6)\n actual_width = max_line_width\n if rect_width > 0:\n actual_width = min(max_line_width, rect_width)\n # \u82e5\u5185\u5bb9\u88ab\u622a\u65ad\u6362\u884c\uff0c\u9ad8\u5ea6\u9700\u8981\u91cd\u65b0\u8ba1\u7b97\n if max_line_width > rect_width:\n total_height = recalc_wrapped_height(formatted_lines, rect_width)\n\n return (actual_width, total_height)\n<\/code><\/pre>\n\n<div class=\"info-box\">\nmtext_size \u7684\u5173\u952e\u53c2\u6570<\/span>Key Parameters of mtext_size<\/span><\/strong><br\/>\n\n– \u6587\u5b57\u5185\u5bb9<\/strong>\uff1a\u9700\u89e3\u6790\u5185\u5d4c\u683c\u5f0f\u4ee3\u7801\uff08\\H, \\W, \\F, \\P \u7b49\uff09<br\/>\n– \u6807\u79f0\u9ad8\u5ea6<\/strong>\uff08\u7ec4\u7801 40\uff09\uff1a\u9ed8\u8ba4\u884c\u9ad8\uff0c\u4f46\u6bcf\u884c\u53ef\u88ab\u683c\u5f0f\u4ee3\u7801\u8986\u76d6<br\/>\n– \u53c2\u8003\u5bbd\u5ea6<\/strong>\uff08\u7ec4\u7801 41\uff09\uff1a\u89e6\u53d1\u81ea\u52a8\u6362\u884c\u7684\u9608\u503c\uff0c0 \u8868\u793a\u4e0d\u6362\u884c<br\/>\n– \u884c\u95f4\u8ddd\u56e0\u5b50<\/strong>\uff08\u7ec4\u7801 44\uff09\uff1a\u63a7\u5236\u884c\u4e0e\u884c\u4e4b\u95f4\u7684\u95f4\u8ddd\u500d\u6570<br\/>\n– \u7ed8\u5236\u65b9\u5411<\/strong>\uff08\u7ec4\u7801 72\uff09\uff1a\u5f71\u54cd\u5bbd\/\u9ad8\u7684\u5b9a\u4e49\uff08\u5de6\u5230\u53f3 vs \u4e0a\u5230\u4e0b\uff09\n<\/span>\n\n– Text content:<\/strong> requires parsing inline format codes (\\H, \\W, \\F, \\P, etc.)<br\/>\n– Nominal height<\/strong> (code 40): default line height, but each line may be overridden by format codes<br\/>\n– Reference width<\/strong> (code 41): threshold for automatic wrapping, 0 means no wrapping<br\/>\n– Line spacing factor<\/strong> (code 44): controls spacing multiplier between lines<br\/>\n– Drawing direction<\/strong> (code 72): affects width\/height definitions (L-R vs T-B)\n<\/span>\n<\/div>\n\n<h3>\u5e38\u89c1 MTEXT \u683c\u5f0f\u4ee3\u7801<\/span>Common MTEXT Format Codes<\/span><\/h3>\n<div class=\"table-wrap\">\n<table>\n<thead>\n<tr>\n<th>\u4ee3\u7801<\/span>Code<\/span><\/th>\n<th>\u542b\u4e49<\/span>Meaning<\/span><\/th>\n<th>\u793a\u4f8b<\/span>Example<\/span><\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr><td><code>\\H<value>;<\/code><\/td><td>\u8bbe\u7f6e\u6587\u5b57\u9ad8\u5ea6<\/span>Set text height<\/span><\/td><td><code>\\H2.5;<\/code> \u9ad8\u5ea6\u4e3a 2.5<\/span>height=2.5<\/span><\/td><\/tr>\n<tr><td><code>\\H<value>x;<\/code><\/td><td>\u8bbe\u7f6e\u76f8\u5bf9\u9ad8\u5ea6\u500d\u6570<\/span>Set relative height multiplier<\/span><\/td><td><code>\\H0.5x;<\/code> \u9ad8\u5ea6\u4e3a\u9ed8\u8ba4\u7684\u4e00\u534a<\/span>half default height<\/span><\/td><\/tr>\n<tr><td><code>\\W<value>;<\/code><\/td><td>\u8bbe\u7f6e\u5bbd\u5ea6\u56e0\u5b50<\/span>Set width factor<\/span><\/td><td><code>\\W1.5;<\/code> \u5bbd\u5ea6\u56e0\u5b50 1.5<\/span>width factor 1.5<\/span><\/td><\/tr>\n<tr><td><code>\\F;<\/code><\/td><td>\u8bbe\u7f6e\u5b57\u4f53<\/span>Set font<\/span><\/td><td><code>\\FSimSun;<\/code> \u5b8b\u4f53<\/span>SimSun font<\/span><\/td><\/tr>\n<tr><td><code>\\C<index>;<\/code><\/td><td>\u8bbe\u7f6e\u989c\u8272\uff08AutoCAD \u989c\u8272\u7d22\u5f15\uff09<\/span>Set color (ACI)<\/span><\/td><td><code>\\C1;<\/code> \u7ea2\u8272<\/span>Red<\/span><\/td><\/tr>\n<tr><td><code>\\P<\/code><\/td><td>\u6bb5\u843d\u6362\u884c<\/span>Paragraph break<\/span><\/td><td><code>Line1\\PLine2<\/code><\/td><\/tr>\n<tr><td><code>\\S<num>^<den>;<\/code><\/td><td>\u5806\u53e0\u5206\u6570<\/span>Stacked fraction<\/span><\/td><td><code>\\S1^2;<\/code> \u4e8c\u5206\u4e4b\u4e00<\/span>1\/2<\/span><\/td><\/tr>\n<tr><td><code>\\L ... \\l<\/code><\/td><td>\u4e0b\u5212\u7ebf<\/span>Underline<\/span><\/td><td><code>\\Ltext\\l<\/code><\/td><\/tr>\n<tr><td><code>\\O ... \\o<\/code><\/td><td>\u4e0a\u5212\u7ebf<\/span>Overline<\/span><\/td><td><code>\\Otext\\o<\/code><\/td><\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n\n<div class=\"tip-box\">\n\u7f16\u7a0b\u5efa\u8bae<\/span>Programming Tip<\/span><\/strong><br\/>\n\u82e5\u4f60\u7684\u5e93\uff08\u5982 ezdxf\uff09\u63d0\u4f9b\u4e86 <code>text_size()<\/code> \u548c <code>mtext_size()<\/code>\uff0c\u4f18\u5148\u4f7f\u7528\u5e93\u81ea\u5e26\u65b9\u6cd5\u800c\u975e\u81ea\u5df1\u8ba1\u7b97\uff0c\u56e0\u4e3a\u5b57\u4f53\u6d4b\u91cf\u548c\u683c\u5f0f\u89e3\u6790\u975e\u5e38\u4f9d\u8d56\u5e95\u5c42\u5b9e\u73b0\u3002\u5982\u679c\u6ca1\u6709\u63d0\u4f9b\uff0c\u53ef\u4ee5\u4f7f\u7528 <code>matplotlib.font_manager<\/code> \u6216 <code>PIL.ImageFont<\/code> \u6765\u8fd1\u4f3c\u6d4b\u91cf\u3002<\/span>\nIf your library (like ezdxf) provides <code>text_size()<\/code> and <code>mtext_size()<\/code>, prefer the built-in methods over manual calculation, as font measurement and format parsing depend heavily on underlying implementation. If not available, you can approximate using <code>matplotlib.font_manager<\/code> or <code>PIL.ImageFont<\/code>.<\/span>\n<\/div>\n<\/section>\n\n\n<section id=\"common-errors\">\n<div class=\"section-icon\">\u26a0\ufe0f<\/div>\n<h2>\u5e38\u89c1\u9519\u8bef\u4e0e\u6ce8\u610f\u4e8b\u9879<\/span>Common Errors & Pitfalls<\/span><\/h2>\n\n<h3>\u9519\u8bef 1\uff1a\u5bf9 MTEXT \u8bfb\u53d6 halign \/ valign<\/span>Error 1: Reading halign\/valign on MTEXT<\/span><\/h3>\n<div class=\"warn-box\">\n\u95ee\u9898<\/span>Problem<\/span><\/strong><br\/>\n\u4ee3\u7801\u540c\u65f6\u904d\u5386 TEXT \u548c MTEXT\uff0c\u76f4\u63a5\u8bbf\u95ee <code>entity.dxf.halign<\/code> \u4f1a\u5728\u9047\u5230 MTEXT \u65f6\u629b\u51fa <code>AttributeError<\/code>\uff0c\u56e0\u4e3a MTEXT \u6ca1\u6709\u8fd9\u4e24\u4e2a\u5c5e\u6027\u3002<\/span>\nCode iterating over both TEXT and MTEXT and directly accessing <code>entity.dxf.halign<\/code> will raise <code>AttributeError<\/code> when encountering MTEXT, because MTEXT does not have these attributes.<\/span>\n<\/div>\n\n<pre><code># \u9519\u8bef\u4ee3\u7801 \u274c\nfor entity in msp:\n h = entity.dxf.halign # MTEXT \u4f1a\u62a5\u9519\uff01\n v = entity.dxf.valign\n\n# \u6b63\u786e\u4ee3\u7801 \u2705\nfor entity in msp:\n if entity.dxftype() == 'TEXT':\n h = entity.dxf.halign\n v = entity.dxf.valign\n elif entity.dxftype() == 'MTEXT':\n att = entity.dxf.attachment_point\n<\/code><\/pre>\n\n<h3>\u9519\u8bef 2\uff1a\u6df7\u6dc6\u9ed8\u8ba4\u63d2\u5165\u70b9<\/span>Error 2: Confusing Default Insertion Points<\/span><\/h3>\n<div class=\"warn-box\">\nProblem<\/span>\u95ee\u9898<\/span><\/strong><br\/>\n\u5c06 TEXT \u7684\u63d2\u5165\u70b9\u5f53\u4f5c\u6587\u5b57\u5de6\u4e0a\u89d2\u5904\u7406\uff0c\u5bfc\u81f4\u6587\u5b57\u4f4d\u7f6e\u5411\u4e0b\u504f\u79fb\u4e00\u4e2a\u6587\u5b57\u9ad8\u5ea6\uff1b\u6216\u5c06 MTEXT \u7684\u63d2\u5165\u70b9\u5f53\u4f5c\u5de6\u4e0a\u89d2\u5904\u7406\u65f6\u5ffd\u7565\u4e86 attachment_point \u7684\u4fee\u6539\u3002<\/span>\nTreating TEXT’s insertion point as the top-left corner causes a downward offset of one text height; or ignoring attachment_point changes when treating MTEXT’s insertion point as top-left.<\/span>\n<\/div>\n\n<h3>\u9519\u8bef 3\uff1a\u5ffd\u7565\u5bf9\u9f50\u70b9\uff08\u7ec4\u7801 11\/21\/31\uff09<\/span>Error 3: Ignoring Alignment Point (codes 11\/21\/31)<\/span><\/h3>\n\u5f53 TEXT \u7684 halign \u6216 valign \u975e\u96f6\u65f6\uff0c\u7ec4\u7801 10\/20\/30 \u4e0d\u518d\u662f\u6587\u5b57\u7684\u5b9e\u9645\u5b9a\u4f4d\u70b9\uff0c\u771f\u6b63\u7684\u5bf9\u9f50\u53c2\u8003\u70b9\u662f\u7ec4\u7801 11\/21\/31\u3002\u82e5\u53ea\u8bfb\u53d6\u63d2\u5165\u70b9\u800c\u5ffd\u7565\u5bf9\u9f50\u70b9\uff0c\u6e32\u67d3\u4f4d\u7f6e\u4f1a\u504f\u5dee\u3002<\/span>When TEXT’s halign or valign is non-zero, group codes 10\/20\/30 are no longer the actual positioning point; the true alignment reference is codes 11\/21\/31. Reading only the insertion point while ignoring the alignment point will cause rendering position errors.<\/span><\/p>\n\n<h3>\u9519\u8bef 4\uff1aMTEXT \u5185\u5bb9\u622a\u65ad<\/span>Error 4: MTEXT Content Truncation<\/span><\/h3>\nMTEXT \u7684\u5185\u5bb9\u8d85\u8fc7 250 \u5b57\u7b26\u65f6\u4f1a\u88ab\u62c6\u5206\u5230\u591a\u4e2a\u7ec4\u7801 3 \u4e2d\u3002\u53ea\u8bfb\u53d6\u7ec4\u7801 1 \u4f1a\u5bfc\u81f4\u5185\u5bb9\u4e0d\u5b8c\u6574\uff0c\u5fc5\u987b\u6309\u987a\u5e8f\u62fc\u63a5\u6240\u6709\u7ec4\u7801 3 \u7684\u503c\u3002<\/span>When MTEXT content exceeds 250 characters, it is split across multiple group code 3 entries. Reading only group code 1 will result in incomplete content; you must concatenate all group code 3 values in order.<\/span><\/p>\n\n<pre><code># ezdxf \u4f1a\u81ea\u52a8\u5904\u7406\u62fc\u63a5\uff0c\u4f46\u539f\u751f DXF \u89e3\u6790\u9700\u6ce8\u610f\n# \u6b63\u786e\u8bfb\u53d6 MTEXT \u5185\u5bb9\u7684\u903b\u8f91\uff1a\ncontent = code_1_value\nfor extra in all_code_3_values:\n content += extra\n<\/code><\/pre>\n\n<div class=\"tip-box\">\n\u6700\u4f73\u5b9e\u8df5<\/span>Best Practices<\/span><\/strong><br\/>\n\n1. \u59cb\u7ec8\u901a\u8fc7 <code>entity.dxftype()<\/code> \u5224\u65ad\u5b9e\u4f53\u7c7b\u578b\u540e\u518d\u8bbf\u95ee\u7279\u5b9a\u5c5e\u6027<br\/>\n2. TEXT \u6e32\u67d3\u65f6\u540c\u65f6\u8003\u8651\u63d2\u5165\u70b9\u548c\u5bf9\u9f50\u70b9\uff0c\u68c0\u67e5 halign\/valign \u662f\u5426\u4e3a 0<br\/>\n3. MTEXT \u8bfb\u53d6\u65f6\u62fc\u63a5\u7ec4\u7801 1 \u548c\u6240\u6709\u7ec4\u7801 3 \u7684\u5185\u5bb9<br\/>\n4. \u8ba1\u7b97 BBox \u65f6\u786e\u4fdd\u5b57\u4f53\u6587\u4ef6\u53ef\u7528\uff0c\u5426\u5219\u4f7f\u7528\u8fd1\u4f3c\u503c<br\/>\n5. \u5904\u7406\u65cb\u8f6c\u6587\u5b57\u65f6\uff0cBBox \u9700\u8981\u5728\u65cb\u8f6c\u540e\u91cd\u65b0\u8ba1\u7b97\uff08\u6216\u8ba1\u7b97\u65cb\u8f6c\u540e\u7684\u89d2\u70b9\uff09\n<\/span>\n\n1. Always check <code>entity.dxftype()<\/code> before accessing entity-specific attributes<br\/>\n2. When rendering TEXT, consider both insertion and alignment points; check if halign\/valign are 0<br\/>\n3. When reading MTEXT, concatenate code 1 with all code 3 values<br\/>\n4. Ensure font files are available when calculating BBox; otherwise use approximations<br\/>\n5. For rotated text, BBox must be recalculated after rotation (or compute rotated corner points)\n<\/span>\n<\/div>\n<\/section>\n\n<div class=\"footnotes\">\n DXF TEXT & MTEXT \u5b9e\u4f53\u53c2\u8003 | \u57fa\u4e8e AutoCAD DXF Reference \u4e0e ezdxf \u6587\u6863\u7f16\u5236<\/span>DXF TEXT & MTEXT Entity Reference | Based on AutoCAD DXF Reference and ezdxf documentation<\/span><\/p>\n<\/div>\n\n<\/div>\n\n\n<script>\nfunction switchLanguage(lang) {\n document.documentElement.lang = lang;\n document.body.className = (lang === 'en') ? 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{"id":285,"date":"2026-06-30T22:52:23","date_gmt":"2026-06-30T14:52:23","guid":{"rendered":"https:\/\/numsimlab.com\/?p=285"},"modified":"2026-06-30T22:52:23","modified_gmt":"2026-06-30T14:52:23","slug":"dxf-textmtext","status":"publish","type":"post","link":"https:\/\/numsimlab.com\/?p=285","title":{"rendered":"DXF TEXT&MTEXT"},"content":{"rendered":"\n\n\n\n\n\nDXF TEXT & MTEXT \u5b9e\u4f53\u5b8c\u5168\u53c2\u8003<\/span>DXF TEXT & MTEXT Entity Complete Reference<\/span><\/title>\n<style>\n:root {\n --bg: #f5faf7;\n --bg2: #eef6f1;\n --ink: #1a2e23;\n --muted: #5a7a6e;\n --rule: #c0d8cc;\n --accent: #059669;\n --accent2: #0d9488;\n --code-bg: #1e2d26;\n --code-fg: #d1fae5;\n --warn-bg: #fff7ed;\n --warn-border: #f97316;\n --info-bg: #eff6ff;\n --info-border: #3b82f6;\n}\n\n* { box-sizing: border-box; margin: 0; padding: 0; }\n\nhtml { scroll-behavior: smooth; }\n\nbody {\n font-family: \"Microsoft YaHei\", \"PingFang SC\", system-ui, -apple-system, sans-serif;\n background: var(--bg);\n color: var(--ink);\n line-height: 1.8;\n}\n\nbody.en-active { font-family: system-ui, -apple-system, sans-serif; }\n\n\/* Language Switcher Bar *\/\n.lang-bar {\n position: sticky;\n top: 0;\n z-index: 1000;\n background: var(--accent);\n display: flex;\n justify-content: center;\n gap: 1rem;\n padding: 0.6rem 1rem;\n box-shadow: 0 2px 8px rgba(0,0,0,0.15);\n}\n\n.lang-bar button {\n background: rgba(255,255,255,0.2);\n border: 2px solid transparent;\n color: #fff;\n padding: 0.4rem 1.2rem;\n border-radius: 4px;\n cursor: pointer;\n font-size: 0.95rem;\n font-weight: 600;\n transition: all 0.2s;\n}\n\n.lang-bar button:hover {\n background: rgba(255,255,255,0.35);\n}\n\n.lang-bar button.active {\n background: #fff;\n color: var(--accent);\n border-color: #fff;\n}\n\n\/* Container *\/\n.container {\n max-width: 1100px;\n margin: 0 auto;\n padding: 0 1.5rem;\n}\n\n\/* Cover *\/\n.cover {\n text-align: center;\n padding: 4rem 1rem 3rem;\n background: var(--bg2);\n border-bottom: 1px solid var(--rule);\n}\n\n.cover h1 {\n font-size: 2.2rem;\n color: var(--ink);\n margin-bottom: 0.8rem;\n font-weight: 700;\n}\n\n.cover .subtitle {\n font-size: 1.3rem;\n color: var(--accent);\n font-weight: 600;\n margin-bottom: 0.6rem;\n}\n\n.cover .desc {\n font-size: 1rem;\n color: var(--muted);\n}\n\n\/* TOC *\/\n.toc {\n background: #fff;\n border: 1px solid var(--rule);\n border-radius: 8px;\n padding: 1.5rem 2rem;\n margin: 2rem 0;\n}\n\n.toc h2 {\n font-size: 1.3rem;\n margin-bottom: 1rem;\n color: var(--accent);\n}\n\n.toc ol, .toc ul {\n padding-left: 1.5rem;\n}\n\n.toc li {\n margin: 0.4rem 0;\n}\n\n.toc a {\n color: var(--ink);\n text-decoration: none;\n transition: color 0.2s;\n}\n\n.toc a:hover {\n color: var(--accent);\n text-decoration: underline;\n}\n\n\/* Sections *\/\nsection {\n background: #fff;\n border: 1px solid var(--rule);\n border-radius: 8px;\n padding: 2rem 2.5rem;\n margin: 2rem 0;\n}\n\nsection h2 {\n font-size: 1.6rem;\n color: var(--accent);\n margin-bottom: 1.2rem;\n padding-bottom: 0.5rem;\n border-bottom: 2px solid var(--rule);\n}\n\nsection h3 {\n font-size: 1.25rem;\n color: var(--accent2);\n margin: 1.5rem 0 0.8rem;\n}\n\nsection h4 {\n font-size: 1.1rem;\n color: var(--ink);\n margin: 1.2rem 0 0.6rem;\n}\n\nsection p {\n margin-bottom: 0.9rem;\n text-align: justify;\n}\n\n\/* Tables *\/\ntable {\n width: 100%;\n border-collapse: collapse;\n margin: 1.2rem 0;\n font-size: 0.95rem;\n}\n\nth, td {\n border: 1px solid var(--rule);\n padding: 0.7rem 0.9rem;\n text-align: left;\n}\n\nth {\n background: var(--bg2);\n font-weight: 600;\n color: var(--ink);\n}\n\ntr:nth-child(even) { background: var(--bg); }\n\n\/* Code *\/\npre {\n background: var(--code-bg);\n color: var(--code-fg);\n padding: 1.2rem 1.5rem;\n border-radius: 6px;\n overflow-x: auto;\n font-family: Consolas, \"Courier New\", monospace;\n font-size: 0.9rem;\n line-height: 1.6;\n margin: 1rem 0;\n}\n\ncode {\n font-family: Consolas, \"Courier New\", monospace;\n background: rgba(5,150,105,0.1);\n padding: 0.15rem 0.4rem;\n border-radius: 3px;\n font-size: 0.9em;\n color: var(--accent);\n}\n\npre code {\n background: transparent;\n padding: 0;\n color: inherit;\n}\n\n\/* Group code highlight *\/\n.gc {\n font-family: Consolas, \"Courier New\", monospace;\n font-weight: 700;\n color: var(--accent2);\n}\n\n\/* Type badges *\/\n.type-badge {\n display: inline-block;\n padding: 0.15em 0.5em;\n border-radius: 4px;\n font-size: 0.72rem;\n font-weight: 600;\n white-space: nowrap;\n}\n\n.type-str { background: #d1fae5; color: #065f46; }\n.type-float { background: #e0e7ff; color: #3730a3; }\n.type-int { background: #fef3c7; color: #92400e; }\n.type-bool { background: #dbeafe; color: #1e40af; }\n.type-handle { background: #fef9c3; color: #854d0e; }\n.type-binary { background: #fce7f3; color: #9d174d; }\n.type-special { background: #f3f4f6; color: #4b5563; }\n\n\/* Tip box *\/\n.tip-box {\n background: #ecfdf5;\n border-left: 4px solid var(--accent);\n padding: 1rem 1.2rem;\n margin: 1.2rem 0;\n border-radius: 0 6px 6px 0;\n font-size: 0.95rem;\n}\n\n.tip-box strong { color: var(--accent); }\n\n\/* Warning box *\/\n.warn-box {\n background: var(--warn-bg);\n border-left: 4px solid var(--warn-border);\n padding: 1rem 1.2rem;\n margin: 1.2rem 0;\n border-radius: 0 6px 6px 0;\n font-size: 0.95rem;\n}\n\n.warn-box strong { color: var(--warn-border); }\n\n\/* Info box *\/\n.info-box {\n background: var(--info-bg);\n border-left: 4px solid var(--info-border);\n padding: 1rem 1.2rem;\n margin: 1.2rem 0;\n border-radius: 0 6px 6px 0;\n font-size: 0.95rem;\n}\n\n.info-box strong { color: var(--info-border); }\n\n\/* Table wrap for scrolling *\/\n.table-wrap {\n overflow-x: auto;\n margin-bottom: 1rem;\n}\n\n\/* Section icon *\/\n.section-icon {\n width: 32px;\n height: 32px;\n border-radius: 8px;\n background: var(--bg2);\n display: inline-flex;\n align-items: center;\n justify-content: center;\n font-size: 1rem;\n margin-right: 0.6rem;\n vertical-align: middle;\n}\n\n\/* Comparison grid *\/\n.compare-grid {\n display: grid;\n grid-template-columns: 1fr 1fr;\n gap: 1.5rem;\n margin: 1.5rem 0;\n}\n\n.compare-card {\n background: var(--bg);\n border: 1px solid var(--rule);\n border-radius: 8px;\n padding: 1.2rem;\n}\n\n.compare-card h4 {\n margin-top: 0;\n color: var(--accent);\n border-bottom: 1px solid var(--rule);\n padding-bottom: 0.5rem;\n}\n\n\/* Diagram area *\/\n.diagram-area {\n background: #fff;\n border: 1px solid var(--rule);\n border-radius: 8px;\n padding: 1.5rem;\n margin: 1.2rem 0;\n text-align: center;\n}\n\n.diagram-title {\n font-weight: 600;\n color: var(--muted);\n margin-bottom: 1rem;\n font-size: 0.9rem;\n}\n\n\/* Footnotes *\/\n.footnotes {\n font-size: 0.85rem;\n color: var(--muted);\n border-top: 1px solid var(--rule);\n margin-top: 2rem;\n padding-top: 1rem;\n text-align: center;\n}\n\n\/* Responsive *\/\n@media (max-width: 768px) {\n .cover h1 { font-size: 1.5rem; }\n .cover .subtitle { font-size: 1.05rem; }\n section { padding: 1.2rem 1rem; }\n section h2 { font-size: 1.3rem; }\n .compare-grid { grid-template-columns: 1fr; }\n table { font-size: 0.85rem; }\n th, td { padding: 0.5rem; }\n}\n\n\/* Language display control *\/\n[data-lang=\"en\"] { display: none; }\nhtml[lang=\"en\"] [data-lang=\"zh\"] { display: none; }\nhtml[lang=\"en\"] [data-lang=\"en\"] { display: inline; }\n\n\/* For block elements *\/\nh2 [data-lang=\"en\"], h3 [data-lang=\"en\"], h4 [data-lang=\"en\"], p [data-lang=\"en\"], li [data-lang=\"en\"], th [data-lang=\"en\"], td [data-lang=\"en\"], div [data-lang=\"en\"] {\n display: none;\n}\n\nhtml[lang=\"en\"] h2 [data-lang=\"zh\"], html[lang=\"en\"] h3 [data-lang=\"zh\"], html[lang=\"en\"] h4 [data-lang=\"zh\"], html[lang=\"en\"] p [data-lang=\"zh\"], html[lang=\"en\"] li [data-lang=\"zh\"], html[lang=\"en\"] th [data-lang=\"zh\"], html[lang=\"en\"] td [data-lang=\"zh\"], html[lang=\"en\"] div [data-lang=\"zh\"] {\n display: none;\n}\n\nhtml[lang=\"en\"] h2 [data-lang=\"en\"], html[lang=\"en\"] h3 [data-lang=\"en\"], html[lang=\"en\"] h4 [data-lang=\"en\"], html[lang=\"en\"] p [data-lang=\"en\"], html[lang=\"en\"] li [data-lang=\"en\"], html[lang=\"en\"] th [data-lang=\"en\"], html[lang=\"en\"] td [data-lang=\"en\"], html[lang=\"en\"] div [data-lang=\"en\"] {\n display: inline;\n}\n\n\/* Inline fix for block-level multilingual wrappers *\/\n.toc h2 span, .cover h1 span, .cover .subtitle span, .cover .desc span, section h2 span, section h3 span, section h4 span, .code-label span, .stat-label span {\n display: inline;\n}\n\nhtml[lang=\"en\"] .toc h2 [data-lang=\"zh\"], html[lang=\"en\"] .cover h1 [data-lang=\"zh\"], html[lang=\"en\"] .cover .subtitle [data-lang=\"zh\"], html[lang=\"en\"] .cover .desc [data-lang=\"zh\"], html[lang=\"en\"] section h2 [data-lang=\"zh\"], html[lang=\"en\"] section h3 [data-lang=\"zh\"], html[lang=\"en\"] section h4 [data-lang=\"zh\"], html[lang=\"en\"] .code-label [data-lang=\"zh\"], html[lang=\"en\"] .stat-label [data-lang=\"zh\"] {\n display: none;\n}\n\nhtml[lang=\"en\"] .toc h2 [data-lang=\"en\"], html[lang=\"en\"] .cover h1 [data-lang=\"en\"], html[lang=\"en\"] .cover .subtitle [data-lang=\"en\"], html[lang=\"en\"] .cover .desc [data-lang=\"en\"], html[lang=\"en\"] section h2 [data-lang=\"en\"], html[lang=\"en\"] section h3 [data-lang=\"en\"], html[lang=\"en\"] section h4 [data-lang=\"en\"], html[lang=\"en\"] .code-label [data-lang=\"en\"], html[lang=\"en\"] .stat-label [data-lang=\"en\"] {\n display: inline;\n}\n\n\/* Attachment point grid diagram *\/\n.attachment-grid {\n display: grid;\n grid-template-columns: repeat(3, 80px);\n grid-template-rows: repeat(3, 80px);\n gap: 4px;\n margin: 1rem auto;\n width: fit-content;\n}\n\n.attachment-cell {\n border: 2px solid var(--rule);\n display: flex;\n align-items: center;\n justify-content: center;\n font-size: 0.85rem;\n font-weight: 600;\n color: var(--muted);\n background: #fff;\n border-radius: 4px;\n position: relative;\n}\n\n.attachment-cell.default {\n border-color: var(--accent);\n background: #ecfdf5;\n color: var(--accent);\n}\n\n.attachment-cell .cell-pos {\n position: absolute;\n top: 2px;\n left: 4px;\n font-size: 0.65rem;\n opacity: 0.7;\n}\n\n\/* Baseline diagram *\/\n.baseline-diagram {\n position: relative;\n height: 120px;\n margin: 1rem auto;\n max-width: 500px;\n border-left: 2px solid var(--ink);\n border-bottom: 2px solid var(--ink);\n}\n\n.baseline-line {\n position: absolute;\n left: 0;\n right: 0;\n border-top: 2px dashed var(--accent);\n}\n\n.baseline-label {\n position: absolute;\n font-size: 0.8rem;\n color: var(--muted);\n}\n<\/style>\n<\/head>\n<body>\n\n\n<div class=\"lang-bar\">\n <button id=\"btn-zh\" class=\"active\" onclick=\"switchLanguage('zh')\">\n \u4e2d\u6587<\/span>Chinese<\/span>\n <\/button>\n <button id=\"btn-en\" onclick=\"switchLanguage('en')\">\n English<\/span>English<\/span>\n <\/button>\n<\/div>\n\n<div class=\"container\">\n\n\n<div class=\"cover\">\n <h1>DXF TEXT & MTEXT \u5b9e\u4f53\u5b8c\u5168\u53c2\u8003<\/span>DXF TEXT & MTEXT Entity Complete Reference<\/span><\/h1>\n <div class=\"subtitle\">DXF Text Entities Deep Dive<\/div>\n <div class=\"desc\">\u6df1\u5165\u89e3\u6790 DXF \u6587\u4ef6\u4e2d TEXT\uff08\u5355\u884c\u6587\u5b57\uff09\u4e0e MTEXT\uff08\u591a\u884c\u6587\u5b57\uff09\u5b9e\u4f53\u7684\u7ec4\u7801\u5b9a\u4e49\u3001\u5bf9\u9f50\u673a\u5236\u3001\u57fa\u7ebf\u6982\u5ff5\u53ca\u7f16\u7a0b\u63a5\u53e3<\/span>Deep dive into TEXT (single-line) and MTEXT (multiline) entity group codes, alignment mechanisms, baseline concepts, and programming interfaces<\/span><\/div>\n<\/div>\n\n\n<nav class=\"toc\">\n <h2>\u76ee\u5f55<\/span>Table of Contents<\/span><\/h2>\n <ol>\n <li><a href=\"#baseline\">\u4ec0\u4e48\u662f\u57fa\u7ebf\uff08Baseline\uff09<\/span>What is the Baseline<\/span><\/a><\/li>\n <li><a href=\"#diff\">TEXT \u4e0e MTEXT \u6838\u5fc3\u533a\u522b<\/span>TEXT vs MTEXT Core Differences<\/span><\/a><\/li>\n <li><a href=\"#text-entity\">TEXT \u5b9e\u4f53\u8be6\u89e3<\/span>TEXT Entity in Detail<\/span><\/a><\/li>\n <li><a href=\"#mtext-entity\">MTEXT \u5b9e\u4f53\u8be6\u89e3<\/span>MTEXT Entity in Detail<\/span><\/a><\/li>\n <li><a href=\"#alignment\">\u5bf9\u9f50\u673a\u5236\u5bf9\u6bd4<\/span>Alignment Mechanism Comparison<\/span><\/a><\/li>\n <li><a href=\"#bbox\">\u5982\u4f55\u7406\u89e3 BBox\uff08\u8fb9\u754c\u6846\uff09<\/span>Understanding BBox (Bounding Box)<\/span><\/a><\/li>\n <li><a href=\"#size-methods\">text_size \u4e0e mtext_size \u65b9\u6cd5<\/span>text_size and mtext_size Methods<\/span><\/a><\/li>\n <li><a href=\"#common-errors\">\u5e38\u89c1\u9519\u8bef\u4e0e\u6ce8\u610f\u4e8b\u9879<\/span>Common Errors & Pitfalls<\/span><\/a><\/li>\n <\/ol>\n<\/nav>\n\n\n<section id=\"baseline\">\n<div class=\"section-icon\">\ud83d\udccf<\/div>\n<h2>\u4ec0\u4e48\u662f\u57fa\u7ebf\uff08Baseline\uff09<\/span>What is the Baseline<\/span><\/h2>\n\n\u5728\u6392\u7248\u5b66\u548c CAD \u7ed8\u56fe\u4e2d\uff0c\u57fa\u7ebf\uff08Baseline\uff09<\/strong>\u662f\u6587\u5b57\u5b57\u7b26\u6240\u5750\u843d\u7684\u4e00\u6761\u5047\u60f3\u6c34\u5e73\u7ebf\u3002\u5bf9\u4e8e\u62c9\u4e01\u5b57\u6bcd\uff08\u5982 a, b, c\uff09\uff0c\u5b57\u7b26\u7684\u4e3b\u4f53\u90e8\u5206\u5750\u843d\u5728\u57fa\u7ebf\u4e0a\uff0c\u800c\u4e0b\u4f38\u90e8\u5206\uff08\u5982 g, p, y \u7684\u5c3e\u90e8\uff09\u5219\u4f1a\u5ef6\u4f38\u5230\u57fa\u7ebf\u4e0b\u65b9\u3002<\/span>In typography and CAD drawing, the baseline<\/strong> is an imaginary horizontal line on which text characters sit. For Latin letters (a, b, c), the main body rests on the baseline, while descenders (like g, p, y) extend below it.<\/span><\/p>\n\n<div class=\"diagram-area\">\n <div class=\"diagram-title\">\u6587\u5b57\u57fa\u7ebf\u793a\u610f\u56fe<\/span>Text Baseline Diagram<\/span><\/div>\n <svg viewBox=\"0 0 500 140\" style=\"max-width:500px;width:100%;height:auto;\">\n \n <line x1=\"30\" y1=\"25\" x2=\"470\" y2=\"25\" stroke=\"#c0d8cc\" stroke-dasharray=\"4,4\" stroke-width=\"1\"\/>\n <text x=\"10\" y=\"28\" font-size=\"11\" fill=\"#5a7a6e\" text-anchor=\"end\">Ascent<\/text>\n\n \n <line x1=\"30\" y1=\"65\" x2=\"470\" y2=\"65\" stroke=\"#c0d8cc\" stroke-dasharray=\"4,4\" stroke-width=\"1\"\/>\n <text x=\"10\" y=\"68\" font-size=\"11\" fill=\"#5a7a6e\" text-anchor=\"end\">X-height<\/text>\n\n \n <line x1=\"30\" y1=\"95\" x2=\"470\" y2=\"95\" stroke=\"#059669\" stroke-width=\"2\"\/>\n <text x=\"10\" y=\"100\" font-size=\"11\" fill=\"#059669\" font-weight=\"bold\" text-anchor=\"end\">Baseline<\/text>\n\n \n <line x1=\"30\" y1=\"115\" x2=\"470\" y2=\"115\" stroke=\"#c0d8cc\" stroke-dasharray=\"4,4\" stroke-width=\"1\"\/>\n <text x=\"10\" y=\"118\" font-size=\"11\" fill=\"#5a7a6e\" text-anchor=\"end\">Descent<\/text>\n\n \n <text x=\"50\" y=\"95\" font-family=\"serif\" font-size=\"60\" fill=\"#1a2e23\">AbgXp<\/text>\n\n \n <line x1=\"280\" y1=\"25\" x2=\"280\" y2=\"95\" stroke=\"#0d9488\" stroke-width=\"1\" marker-end=\"url(#arrowup)\" marker-start=\"url(#arrowdown)\"\/>\n <text x=\"285\" y=\"62\" font-size=\"11\" fill=\"#0d9488\" font-weight=\"bold\">Text Height<\/text>\n\n \n <defs>\n <marker id=\"arrowup\" markerWidth=\"6\" markerHeight=\"6\" refX=\"3\" refY=\"6\" orient=\"auto\">\n <path d=\"M0,6 L3,0 L6,6\" fill=\"#0d9488\"\/>\n <\/marker>\n <marker id=\"arrowdown\" markerWidth=\"6\" markerHeight=\"6\" refX=\"3\" refY=\"0\" orient=\"auto\">\n <path d=\"M0,0 L3,6 L6,0\" fill=\"#0d9488\"\/>\n <\/marker>\n <\/defs>\n <\/svg>\n<\/div>\n\n\u5728 DXF \u7684 <code>TEXT<\/code> \u5b9e\u4f53\u4e2d\uff0c\u9ed8\u8ba4\u7684\u63d2\u5165\u70b9\uff08\u7ec4\u7801 10\/20\/30\uff09\u5c31\u4f4d\u4e8e\u6587\u5b57\u7684\u5de6\u7aef\u57fa\u7ebf\u5904<\/strong>\u3002\u4e5f\u5c31\u662f\u8bf4\uff0c\u5f53\u4f60\u8f93\u5165\u4e00\u4e2a TEXT \u5b9e\u4f53\u800c\u4e0d\u6307\u5b9a\u4efb\u4f55\u5bf9\u9f50\u65b9\u5f0f\u65f6\uff0c\u6587\u5b57\u5c06\u4ece\u63d2\u5165\u70b9\u5f00\u59cb\u5411\u53f3\u4fa7\u5ef6\u4f38\uff0c\u5b57\u7b26\u5e95\u90e8\u5750\u843d\u5728\u57fa\u7ebf\u4e0a\u3002\u8fd9\u4e0e <code>MTEXT<\/code> \u4e0d\u540c\uff1aMTEXT \u9ed8\u8ba4\u7684\u63d2\u5165\u70b9\u4f4d\u4e8e\u6587\u5b57\u7684\u5de6\u4e0a\u89d2<\/strong>\u3002<\/span>In DXF <code>TEXT<\/code> entities, the default insertion point (group codes 10\/20\/30) is at the left end of the baseline<\/strong>. When you create a TEXT entity without specifying alignment, text extends to the right from the insertion point with characters sitting on the baseline. This differs from <code>MTEXT<\/code>, whose default insertion point is at the top-left corner<\/strong> of the text.<\/span><\/p>\n\n<div class=\"tip-box\">\n\u8bb0\u5fc6\u8981\u70b9<\/span>Key Takeaway<\/span><\/strong><br\/>\nTEXT \u9ed8\u8ba4\u63d2\u5165\u70b9 = \u5de6\u4e0b\u89d2\u57fa\u7ebf\u5904\uff08\u8fd1\u4f3c\u5de6\u4e0b\u89d2\uff0c\u4f46\u56e0\u57fa\u7ebf\u975e\u6700\u5e95\u90e8\uff0c\u4e25\u683c\u8bf4\u662f\u5de6\u7aef\u57fa\u7ebf\uff09\u3002<br\/>MTEXT \u9ed8\u8ba4\u63d2\u5165\u70b9 = \u5de6\u4e0a\u89d2\u3002<\/span>\nTEXT default insertion point = left end of baseline (approximately lower-left, but strictly speaking left end of baseline since baseline is not the very bottom).<br\/>MTEXT default insertion point = top-left corner.<\/span>\n<\/div>\n<\/section>\n\n\n<section id=\"diff\">\n<div class=\"section-icon\">\u2696\ufe0f<\/div>\n<h2>TEXT \u4e0e MTEXT \u6838\u5fc3\u533a\u522b<\/span>TEXT vs MTEXT Core Differences<\/span><\/h2>\n\n<div class=\"table-wrap\">\n<table>\n<thead>\n<tr>\n<th>\u7279\u6027<\/span>Feature<\/span><\/th>\n<th>TEXT\uff08\u5355\u884c\u6587\u5b57\uff09<\/span>TEXT (Single-line)<\/span><\/th>\n<th>MTEXT\uff08\u591a\u884c\u6587\u5b57\uff09<\/span>MTEXT (Multiline)<\/span><\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>\u6587\u5b57\u5185\u5bb9<\/span>Content<\/span><\/td>\n<td>\u5355\u884c\u7eaf\u6587\u672c\uff0c\u65e0\u683c\u5f0f\u63a7\u5236<\/span>Single line of plain text, no formatting<\/span><\/td>\n<td>\u591a\u884c\u6587\u672c\uff0c\u652f\u6301\u5bcc\u683c\u5f0f\uff08\u5b57\u4f53\u3001\u989c\u8272\u3001\u9ad8\u5ea6\u3001\u5806\u53e0\u7b49\uff09<\/span>Multiline text with rich formatting (font, color, height, stacking, etc.)<\/span><\/td>\n<\/tr>\n<tr>\n<td>\u6362\u884c\u652f\u6301<\/span>Line Breaks<\/span><\/td>\n<td>\u4e0d\u652f\u6301\u81ea\u52a8\u6362\u884c\uff0c\u9700\u624b\u52a8\u63d2\u5165\u591a\u4e2a TEXT<\/span>No automatic wrapping; multiple TEXT entities needed<\/span><\/td>\n<td>\u652f\u6301\u81ea\u52a8\u6362\u884c\u548c\u6bb5\u843d<\/span>Supports automatic wrapping and paragraphs<\/span><\/td>\n<\/tr>\n<tr>\n<td>\u9ed8\u8ba4\u63d2\u5165\u70b9<\/span>Default Insertion Point<\/span><\/td>\n<td>\u5de6\u7aef\u57fa\u7ebf\u5904\uff08\u5de6\u4e0b\u8fd1\u4f3c\uff09<\/span>Left end of baseline (approx. lower-left)<\/span><\/td>\n<td>\u5de6\u4e0a\u89d2<\/span>Top-left corner<\/span><\/td>\n<\/tr>\n<tr>\n<td>\u5bf9\u9f50\u63a7\u5236<\/span>Alignment Control<\/span><\/td>\n<td><code>halign<\/code> (72) + <code>valign<\/code> (73) \u4e24\u4e2a\u5b57\u6bb5<\/span><code>halign<\/code> (72) + <code>valign<\/code> (73) two fields<\/span><\/td>\n<td><code>attachment_point<\/code> (71) \u5355\u4e00\u5b57\u6bb5<\/span><code>attachment_point<\/code> (71) single field<\/span><\/td>\n<\/tr>\n<tr>\n<td>\u6587\u5b57\u9ad8\u5ea6<\/span>Text Height<\/span><\/td>\n<td>\u7ec4\u7801 40\uff0c\u7edf\u4e00\u9ad8\u5ea6<\/span>Group code 40, uniform height<\/span><\/td>\n<td>\u7ec4\u7801 40 \u4e3a\u6807\u79f0\u9ad8\u5ea6\uff0c\u6bcf\u884c\u53ef\u4e0d\u540c<\/span>Group code 40 is nominal height; each line may differ<\/span><\/td>\n<\/tr>\n<tr>\n<td>\u5bbd\u5ea6\u56e0\u5b50<\/span>Width Factor<\/span><\/td>\n<td>\u7ec4\u7801 41<\/span>Group code 41<\/span><\/td>\n<td>\u7ec4\u7801 41 \u4e3a\u53c2\u8003\u77e9\u5f62\u5bbd\u5ea6<\/span>Group code 41 is reference rectangle width<\/span><\/td>\n<\/tr>\n<tr>\n<td>\u65cb\u8f6c\u89d2\u5ea6<\/span>Rotation<\/span><\/td>\n<td>\u7ec4\u7801 50<\/span>Group code 50<\/span><\/td>\n<td>\u7ec4\u7801 50<\/span>Group code 50<\/span><\/td>\n<\/tr>\n<tr>\n<td>\u9002\u7528\u573a\u666f<\/span>Use Case<\/span><\/td>\n<td>\u7b80\u5355\u6807\u7b7e\u3001\u6807\u6ce8\u6587\u5b57\u3001\u5c5e\u6027\u503c<\/span>Simple labels, dimension text, attribute values<\/span><\/td>\n<td>\u6bb5\u843d\u8bf4\u660e\u3001\u6280\u672f\u6ce8\u91ca\u3001\u591a\u884c\u6807\u6ce8<\/span>Paragraph descriptions, technical notes, multiline annotations<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n\n<div class=\"info-box\">\n\u5b9e\u4f53\u7c7b\u578b\u6807\u8bc6<\/span>Entity Type Identifiers<\/span><\/strong><br\/>\n\u5728 DXF \u6587\u4ef6\u4e2d\uff0c\u7ec4\u7801 0 \u7684\u503c\u533a\u5206\u4e24\u79cd\u5b9e\u4f53\uff1a<code>TEXT<\/code> \u8868\u793a\u5355\u884c\u6587\u5b57\uff0c<code>MTEXT<\/code> \u8868\u793a\u591a\u884c\u6587\u5b57\u3002\u4e24\u8005\u4e0d\u80fd\u6df7\u7528\uff0c\u5404\u81ea\u62e5\u6709\u72ec\u7acb\u7684\u7ec4\u7801\u5b9a\u4e49\u3002<\/span>\nIn DXF files, group code 0 distinguishes the two: <code>TEXT<\/code> for single-line text, <code>MTEXT<\/code> for multiline text. They are not interchangeable and each has its own group code definitions.<\/span>\n<\/div>\n<\/section>\n\n\n<section id=\"text-entity\">\n<div class=\"section-icon\">\ud83d\udcdd<\/div>\n<h2>TEXT \u5b9e\u4f53\u8be6\u89e3<\/span>TEXT Entity in Detail<\/span><\/h2>\n\n<code>TEXT<\/code> \u662f DXF \u4e2d\u6700\u57fa\u672c\u7684\u6587\u5b57\u5b9e\u4f53\uff0c\u7528\u4e8e\u8868\u793a\u5355\u884c\u6587\u5b57\u3002\u5b83\u7684\u63d2\u5165\u70b9\u3001\u9ad8\u5ea6\u3001\u65cb\u8f6c\u89d2\u5ea6\u548c\u5bf9\u9f50\u65b9\u5f0f\u90fd\u7531\u72ec\u7acb\u7684\u7ec4\u7801\u63a7\u5236\u3002<\/span><code>TEXT<\/code> is the most basic text entity in DXF, representing a single line of text. Its insertion point, height, rotation angle, and alignment are controlled by independent group codes.<\/span><\/p>\n\n<h3>TEXT \u4e13\u5c5e\u7ec4\u7801<\/span>TEXT-Specific Group Codes<\/span><\/h3>\n<div class=\"table-wrap\">\n<table>\n<thead>\n<tr>\n<th>\u7ec4\u7801<\/span>Code<\/span><\/th>\n<th>\u5b57\u6bb5\u540d<\/span>Field Name<\/span><\/th>\n<th>\u4e2d\u6587\u8bf4\u660e<\/span>Description<\/span><\/th>\n<th>\u7c7b\u578b<\/span>Type<\/span><\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr><td>1<\/span><\/td><td>Text String<\/td><td>\u6587\u5b57\u5185\u5bb9\u5b57\u7b26\u4e32<\/span>The text string itself<\/span><\/td><td>String<\/span><\/td><\/tr>\n<tr><td>10<\/span><\/td><td>Insertion Point X<\/td><td>\u63d2\u5165\u70b9 X \u5750\u6807\uff08\u9ed8\u8ba4\u5728\u5de6\u7aef\u57fa\u7ebf\uff09<\/span>Insertion point X (default at left baseline)<\/span><\/td><td>Double<\/span><\/td><\/tr>\n<tr><td>20<\/span><\/td><td>Insertion Point Y<\/td><td>\u63d2\u5165\u70b9 Y \u5750\u6807<\/span>Insertion point Y<\/span><\/td><td>Double<\/span><\/td><\/tr>\n<tr><td>30<\/span><\/td><td>Insertion Point Z<\/td><td>\u63d2\u5165\u70b9 Z \u5750\u6807\uff08\u53ef\u7701\u7565\uff0c\u9ed8\u8ba4 0\uff09<\/span>Insertion point Z (optional, default 0)<\/span><\/td><td>Double<\/span><\/td><\/tr>\n<tr><td>40<\/span><\/td><td>Text Height<\/td><td>\u6587\u5b57\u9ad8\u5ea6\uff08\u6cbf\u57fa\u7ebf\u5230 ascent \u7684\u8ddd\u79bb\uff09<\/span>Text height (baseline to ascent distance)<\/span><\/td><td>Double<\/span><\/td><\/tr>\n<tr><td>41<\/span><\/td><td>Relative X Scale Factor<\/td><td>X \u65b9\u5411\u5bbd\u5ea6\u6bd4\u4f8b\u56e0\u5b50\uff08\u9ed8\u8ba4 1.0\uff09<\/span>X scale factor (default 1.0)<\/span><\/td><td>Double<\/span><\/td><\/tr>\n<tr><td>50<\/span><\/td><td>Rotation Angle<\/td><td>\u65cb\u8f6c\u89d2\u5ea6\uff08\u5ea6\uff0c\u7ed5\u63d2\u5165\u70b9\u9006\u65f6\u9488\uff09<\/span>Rotation angle in degrees (CCW around insert point)<\/span><\/td><td>Double<\/span><\/td><\/tr>\n<tr><td>51<\/span><\/td><td>Oblique Angle<\/td><td>\u503e\u659c\u89d2\u5ea6\uff08\u5ea6\uff0c\u7528\u4e8e\u659c\u4f53\u5b57\uff09<\/span>Oblique angle in degrees (for italic effect)<\/span><\/td><td>Double<\/span><\/td><\/tr>\n<tr><td>7<\/span><\/td><td>Text Style Name<\/td><td>\u6587\u5b57\u6837\u5f0f\u540d\u79f0\uff08\u5982 “Standard”\uff09<\/span>Text style name (e.g. “Standard”)<\/span><\/td><td>String<\/span><\/td><\/tr>\n<tr><td>71<\/span><\/td><td>Text Generation Flags<\/td><td>\u6587\u5b57\u751f\u6210\u6807\u5fd7\uff082=\u5012\u7f6e, 4=\u53cd\u5411\uff09<\/span>Text generation flags (2=upside-down, 4=backwards)<\/span><\/td><td>Int16<\/span><\/td><\/tr>\n<tr><td>72<\/span><\/td><td>Horizontal Alignment<\/td><td>\u6c34\u5e73\u5bf9\u9f50\u65b9\u5f0f\uff08halign\uff09<\/span>Horizontal alignment (halign)<\/span><\/td><td>Int16<\/span><\/td><\/tr>\n<tr><td>73<\/span><\/td><td>Vertical Alignment<\/td><td>\u5782\u76f4\u5bf9\u9f50\u65b9\u5f0f\uff08valign\uff09<\/span>Vertical alignment (valign)<\/span><\/td><td>Int16<\/span><\/td><\/tr>\n<tr><td>11<\/span><\/td><td>Alignment Point X<\/td><td>\u5bf9\u9f50\u70b9 X\uff08\u5f53 halign\/valign \u975e\u9ed8\u8ba4\u65f6\u6709\u6548\uff09<\/span>Alignment point X (used when halign\/valign non-default)<\/span><\/td><td>Double<\/span><\/td><\/tr>\n<tr><td>21<\/span><\/td><td>Alignment Point Y<\/td><td>\u5bf9\u9f50\u70b9 Y<\/span>Alignment point Y<\/span><\/td><td>Double<\/span><\/td><\/tr>\n<tr><td>31<\/span><\/td><td>Alignment Point Z<\/td><td>\u5bf9\u9f50\u70b9 Z<\/span>Alignment point Z<\/span><\/td><td>Double<\/span><\/td><\/tr>\n<tr><td>210<\/span><\/td><td>Extrusion X<\/td><td>\u62c9\u4f38\u65b9\u5411 X\uff08\u5b9a\u4e49\u6587\u5b57\u6240\u5728\u5e73\u9762\uff09<\/span>Extrusion direction X (defines text plane)<\/span><\/td><td>Double<\/span><\/td><\/tr>\n<tr><td>220<\/span><\/td><td>Extrusion Y<\/td><td>\u62c9\u4f38\u65b9\u5411 Y<\/span>Extrusion direction Y<\/span><\/td><td>Double<\/span><\/td><\/tr>\n<tr><td>230<\/span><\/td><td>Extrusion Z<\/td><td>\u62c9\u4f38\u65b9\u5411 Z\uff08\u9ed8\u8ba4 0,0,1 \u5373 XY \u5e73\u9762\uff09<\/span>Extrusion direction Z (default 0,0,1 = XY plane)<\/span><\/td><td>Double<\/span><\/td><\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n\n<h3>TEXT \u6c34\u5e73\u5bf9\u9f50\uff08halign\uff0c\u7ec4\u7801 72\uff09<\/span>TEXT Horizontal Alignment (halign, code 72)<\/span><\/h3>\n<div class=\"table-wrap\">\n<table>\n<thead>\n<tr>\n<th>\u53d6\u503c<\/span>Value<\/span><\/th>\n<th>\u4e2d\u6587\u540d\u79f0<\/span>Name<\/span><\/th>\n<th>\u63d2\u5165\u70b9\u4f4d\u7f6e\u8bf4\u660e<\/span>Insertion Point Description<\/span><\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr><td>0<\/span><\/td><td>\u5de6\u5bf9\u9f50\uff08\u9ed8\u8ba4\uff09<\/span>Left (default)<\/span><\/td><td>\u6587\u5b57\u5de6\u7aef\u4f4d\u4e8e\u63d2\u5165\u70b9<\/span>Left end of text at insertion point<\/span><\/td><\/tr>\n<tr><td>1<\/span><\/td><td>\u5c45\u4e2d\u5bf9\u9f50<\/span>Center<\/span><\/td><td>\u6587\u5b57\u6c34\u5e73\u4e2d\u5fc3\u4f4d\u4e8e\u63d2\u5165\u70b9<\/span>Horizontal center of text at insertion point<\/span><\/td><\/tr>\n<tr><td>2<\/span><\/td><td>\u53f3\u5bf9\u9f50<\/span>Right<\/span><\/td><td>\u6587\u5b57\u53f3\u7aef\u4f4d\u4e8e\u63d2\u5165\u70b9<\/span>Right end of text at insertion point<\/span><\/td><\/tr>\n<tr><td>3<\/span><\/td><td>\u5bf9\u9f50\uff08Aligned\uff09<\/span>Aligned<\/span><\/td><td>\u6587\u5b57\u4e24\u7aef\u5206\u522b\u5bf9\u9f50\u5230\u4e24\u4e2a\u70b9\uff0c\u9ad8\u5ea6\u81ea\u52a8\u8c03\u6574<\/span>Text stretched between two points, height auto-adjusted<\/span><\/td><\/tr>\n<tr><td>4<\/span><\/td><td>\u5e03\u6ee1\uff08Fit\uff09<\/span>Fit<\/span><\/td><td>\u6587\u5b57\u4e24\u7aef\u5206\u522b\u5bf9\u9f50\u5230\u4e24\u4e2a\u70b9\uff0c\u9ad8\u5ea6\u4e0d\u53d8<\/span>Text fitted between two points, height fixed<\/span><\/td><\/tr>\n<tr><td>5<\/span><\/td><td>\u57fa\u7ebf\u5c45\u4e2d\u5bf9\u9f50<\/span>Baseline Center<\/span><\/td><td>\u57fa\u7ebf\u4e2d\u70b9\u4f4d\u4e8e\u63d2\u5165\u70b9\uff08\u4e0e 1 \u7c7b\u4f3c\u4f46\u5b9a\u4f4d\u5728\u57fa\u7ebf\uff09<\/span>Baseline midpoint at insertion point<\/span><\/td><\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n\n<h3>TEXT \u5782\u76f4\u5bf9\u9f50\uff08valign\uff0c\u7ec4\u7801 73\uff09<\/span>TEXT Vertical Alignment (valign, code 73)<\/span><\/h3>\n<div class=\"table-wrap\">\n<table>\n<thead>\n<tr>\n<th>\u53d6\u503c<\/span>Value<\/span><\/th>\n<th>\u4e2d\u6587\u540d\u79f0<\/span>Name<\/span><\/th>\n<th>\u63d2\u5165\u70b9\u4f4d\u7f6e\u8bf4\u660e<\/span>Insertion Point Description<\/span><\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr><td>0<\/span><\/td><td>\u57fa\u7ebf\u5bf9\u9f50\uff08\u9ed8\u8ba4\uff09<\/span>Baseline (default)<\/span><\/td><td>\u63d2\u5165\u70b9\u4f4d\u4e8e\u6587\u5b57\u57fa\u7ebf<\/span>Insertion point on text baseline<\/span><\/td><\/tr>\n<tr><td>1<\/span><\/td><td>\u5e95\u90e8\u5bf9\u9f50<\/span>Bottom<\/span><\/td><td>\u63d2\u5165\u70b9\u4f4d\u4e8e\u6587\u5b57\u6700\u5e95\u90e8\uff08\u542b\u4e0b\u4f38\u90e8\uff09<\/span>Insertion point at text bottom (including descenders)<\/span><\/td><\/tr>\n<tr><td>2<\/span><\/td><td>\u5c45\u4e2d\u5bf9\u9f50<\/span>Middle<\/span><\/td><td>\u63d2\u5165\u70b9\u4f4d\u4e8e\u6587\u5b57\u5782\u76f4\u4e2d\u5fc3<\/span>Insertion point at vertical center<\/span><\/td><\/tr>\n<tr><td>3<\/span><\/td><td>\u9876\u90e8\u5bf9\u9f50<\/span>Top<\/span><\/td><td>\u63d2\u5165\u70b9\u4f4d\u4e8e\u6587\u5b57\u6700\u9876\u90e8<\/span>Insertion point at text top<\/span><\/td><\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n\n<div class=\"tip-box\">\n\u5bf9\u9f50\u70b9\uff08\u7ec4\u7801 11\/21\/31\uff09<\/span>Alignment Point (codes 11\/21\/31)<\/span><\/strong><br\/>\n\u5f53 halign \u6216 valign \u4e0d\u4e3a 0\uff08\u9ed8\u8ba4\u503c\uff09\u65f6\uff0c\u7ec4\u7801 11\/21\/31 \u5b9a\u4e49\u7684\u6587\u5b57\u5bf9\u9f50\u70b9\u751f\u6548\uff0c\u800c\u7ec4\u7801 10\/20\/30 \u7684\u63d2\u5165\u70b9\u4ec5\u7528\u4e8e\u5b9a\u4f4d\u3002\u82e5 halign=0 \u4e14 valign=0\uff0c\u5219\u5bf9\u9f50\u70b9\u4e0e\u63d2\u5165\u70b9\u91cd\u5408\u3002<\/span>\nWhen halign or valign is non-zero, the alignment point (codes 11\/21\/31) takes effect, while codes 10\/20\/30 serve only for positioning. If both are 0, the alignment point coincides with the insertion point.<\/span>\n<\/div>\n<\/section>\n\n\n<section id=\"mtext-entity\">\n<div class=\"section-icon\">\ud83d\udcc4<\/div>\n<h2>MTEXT \u5b9e\u4f53\u8be6\u89e3<\/span>MTEXT Entity in Detail<\/span><\/h2>\n\n<code>MTEXT<\/code>\uff08\u591a\u884c\u6587\u5b57\uff09\u662f\u529f\u80fd\u66f4\u5f3a\u5927\u7684\u6587\u5b57\u5b9e\u4f53\uff0c\u652f\u6301\u591a\u884c\u663e\u793a\u3001\u5185\u5d4c\u683c\u5f0f\u4ee3\u7801\u3001\u6bb5\u843d\u8bbe\u7f6e\u548c\u5206\u680f\u3002\u5b83\u7684\u5bf9\u9f50\u65b9\u5f0f\u7531\u5355\u4e00\u7684 <code>attachment_point<\/code> \u5b57\u6bb5\u63a7\u5236\u3002<\/span><code>MTEXT<\/code> (multiline text) is a more powerful entity supporting multiple lines, inline format codes, paragraph settings, and columns. Its alignment is controlled by a single <code>attachment_point<\/code> field.<\/span><\/p>\n\n<h3>MTEXT \u4e13\u5c5e\u7ec4\u7801<\/span>MTEXT-Specific Group Codes<\/span><\/h3>\n<div class=\"table-wrap\">\n<table>\n<thead>\n<tr>\n<th>\u7ec4\u7801<\/span>Code<\/span><\/th>\n<th>\u5b57\u6bb5\u540d<\/span>Field Name<\/span><\/th>\n<th>\u4e2d\u6587\u8bf4\u660e<\/span>Description<\/span><\/th>\n<th>\u7c7b\u578b<\/span>Type<\/span><\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr><td>1<\/span><\/td><td>Text Content<\/td><td>\u6587\u5b57\u5185\u5bb9\uff08\u542b\u683c\u5f0f\u4ee3\u7801\uff0c\u5982 \\Hxxx; \u63a7\u5236\u9ad8\u5ea6\uff09<\/span>Text content (with format codes like \\Hxxx; for height)<\/span><\/td><td>String<\/span><\/td><\/tr>\n<tr><td>3<\/span><\/td><td>Additional Text<\/td><td>\u9644\u52a0\u6587\u5b57\uff08\u5185\u5bb9\u8d85\u957f\u65f6\u7eed\u63a5\uff0c\u53ef\u591a\u4e2a\u7ec4\u7801 3\uff09<\/span>Additional text (continuation when content is long, multiple code 3 allowed)<\/span><\/td><td>String<\/span><\/td><\/tr>\n<tr><td>10<\/span><\/td><td>Insertion Point X<\/td><td>\u63d2\u5165\u70b9 X\uff08\u9ed8\u8ba4\u5de6\u4e0a\u89d2\uff09<\/span>Insertion point X (default top-left)<\/span><\/td><td>Double<\/span><\/td><\/tr>\n<tr><td>20<\/span><\/td><td>Insertion Point Y<\/td><td>\u63d2\u5165\u70b9 Y<\/span>Insertion point Y<\/span><\/td><td>Double<\/span><\/td><\/tr>\n<tr><td>30<\/span><\/td><td>Insertion Point Z<\/td><td>\u63d2\u5165\u70b9 Z<\/span>Insertion point Z<\/span><\/td><td>Double<\/span><\/td><\/tr>\n<tr><td>40<\/span><\/td><td>Nominal Text Height<\/td><td>\u6807\u79f0\u6587\u5b57\u9ad8\u5ea6\uff08\u9ed8\u8ba4\u884c\u9ad8\uff09<\/span>Nominal text height (default line height)<\/span><\/td><td>Double<\/span><\/td><\/tr>\n<tr><td>41<\/span><\/td><td>Reference Rectangle Width<\/td><td>\u53c2\u8003\u77e9\u5f62\u5bbd\u5ea6\uff08\u81ea\u52a8\u6362\u884c\u7684\u8fb9\u754c\u5bbd\u5ea6\uff0c0=\u4e0d\u6362\u884c\uff09<\/span>Reference rectangle width (wrap boundary, 0=no wrapping)<\/span><\/td><td>Double<\/span><\/td><\/tr>\n<tr><td>42<\/span><\/td><td>Reference Rectangle Height<\/td><td>\u53c2\u8003\u77e9\u5f62\u9ad8\u5ea6<\/span>Reference rectangle height<\/span><\/td><td>Double<\/span><\/td><\/tr>\n<tr><td>43<\/span><\/td><td>Actual Rectangle Height<\/td><td>\u5b9e\u9645\u77e9\u5f62\u9ad8\u5ea6\uff08DXF \u8f93\u51fa\u65f6\u586b\u5145\uff09<\/span>Actual rectangle height (filled on DXF output)<\/span><\/td><td>Double<\/span><\/td><\/tr>\n<tr><td>50<\/span><\/td><td>Rotation Angle<\/td><td>\u65cb\u8f6c\u89d2\u5ea6\uff08\u5ea6\uff09<\/span>Rotation angle in degrees<\/span><\/td><td>Double<\/span><\/td><\/tr>\n<tr><td>71<\/span><\/td><td>Attachment Point<\/td><td>\u9644\u7740\u70b9 \/ \u5bf9\u9f50\u65b9\u5f0f\uff081~9\uff0c\u89c1\u4e0b\u8868\uff09<\/span>Attachment point \/ alignment (1-9, see table below)<\/span><\/td><td>Int16<\/span><\/td><\/tr>\n<tr><td>72<\/span><\/td><td>Drawing Direction<\/td><td>\u6587\u5b57\u7ed8\u5236\u65b9\u5411\uff081=\u5de6\u5230\u53f3, 3=\u4e0a\u5230\u4e0b, 5=\u53f3\u5230\u5de6\uff09<\/span>Drawing direction (1=L-R, 3=T-B, 5=R-L)<\/span><\/td><td>Int16<\/span><\/td><\/tr>\n<tr><td>73<\/span><\/td><td>Line Spacing Style<\/td><td>\u884c\u95f4\u8ddd\u6837\u5f0f\uff081=\u81f3\u5c11, 2=\u7cbe\u786e\uff09<\/span>Line spacing style (1=at least, 2=exact)<\/span><\/td><td>Int16<\/span><\/td><\/tr>\n<tr><td>44<\/span><\/td><td>Line Spacing Factor<\/td><td>\u884c\u95f4\u8ddd\u6bd4\u4f8b\u56e0\u5b50\uff08\u57fa\u4e8e\u6587\u5b57\u9ad8\u5ea6\u7684\u500d\u6570\uff09<\/span>Line spacing factor (multiple of text height)<\/span><\/td><td>Double<\/span><\/td><\/tr>\n<tr><td>7<\/span><\/td><td>Text Style Name<\/td><td>\u6587\u5b57\u6837\u5f0f\u540d\u79f0<\/span>Text style name<\/span><\/td><td>String<\/span><\/td><\/tr>\n<tr><td>90<\/span><\/td><td>Column Type<\/td><td>\u5206\u680f\u7c7b\u578b\uff080=\u65e0, 1=\u9759\u6001, 2=\u52a8\u6001\uff0cR2018+\uff09<\/span>Column type (0=none, 1=static, 2=dynamic, R2018+)<\/span><\/td><td>Int32<\/span><\/td><\/tr>\n<tr><td>210<\/span><\/td><td>Extrusion X<\/td><td>\u62c9\u4f38\u65b9\u5411 X<\/span>Extrusion direction X<\/span><\/td><td>Double<\/span><\/td><\/tr>\n<tr><td>220<\/span><\/td><td>Extrusion Y<\/td><td>\u62c9\u4f38\u65b9\u5411 Y<\/span>Extrusion direction Y<\/span><\/td><td>Double<\/span><\/td><\/tr>\n<tr><td>230<\/span><\/td><td>Extrusion Z<\/td><td>\u62c9\u4f38\u65b9\u5411 Z<\/span>Extrusion direction Z<\/span><\/td><td>Double<\/span><\/td><\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n\n<h3>MTEXT \u9644\u7740\u70b9\uff08attachment_point\uff0c\u7ec4\u7801 71\uff09<\/span>MTEXT Attachment Point (code 71)<\/span><\/h3>\nMTEXT \u7684 <code>attachment_point<\/code> \u7528\u5355\u4e2a\u6570\u503c 1~9 \u8868\u793a\u4e5d\u5bab\u683c\u4f4d\u7f6e\uff0c\u540c\u65f6\u63a7\u5236\u6c34\u5e73\u548c\u5782\u76f4\u5bf9\u9f50\uff1a<\/span>MTEXT’s <code>attachment_point<\/code> uses a single value 1-9 to represent a 3×3 grid position, controlling both horizontal and vertical alignment simultaneously:<\/span><\/p>\n\n<div class=\"diagram-area\">\n <div class=\"diagram-title\">MTEXT \u9644\u7740\u70b9\u4e5d\u5bab\u683c\uff08\u7ec4\u7801 71\uff09<\/span>MTEXT Attachment Point Grid (code 71)<\/span><\/div>\n <div class=\"attachment-grid\">\n <div class=\"attachment-cell\">3<\/span>\u53f3\u4e0a<\/span>TR<\/span><\/div>\n <div class=\"attachment-cell\">2<\/span>\u4e0a\u4e2d<\/span>TC<\/span><\/div>\n <div class=\"attachment-cell\">1<\/span>TL<\/span>\u5de6\u4e0a<\/span><\/div>\n <div class=\"attachment-cell\">6<\/span>\u53f3\u4e2d<\/span>MR<\/span><\/div>\n <div class=\"attachment-cell\">5<\/span>\u6b63\u4e2d<\/span>MC<\/span><\/div>\n <div class=\"attachment-cell\">4<\/span>\u5de6\u4e2d<\/span>ML<\/span><\/div>\n <div class=\"attachment-cell\">9<\/span>\u53f3\u4e0b<\/span>BR<\/span><\/div>\n <div class=\"attachment-cell\">8<\/span>\u4e0b\u4e2d<\/span>BC<\/span><\/div>\n <div class=\"attachment-cell default\">7<\/span>\u5de6\u4e0b<\/span>BL<\/span><\/div>\n <\/div>\n \u7eff\u8272\u8fb9\u6846 = \u9ed8\u8ba4\u9644\u7740\u70b9\uff08\u5de6\u4e0a\u89d2\u5728 DXF \u4e2d\u8bb0\u4e3a 1\uff0c\u4f46\u5728\u4e0a\u56fe\u4e2d\u4e3a\u4e86\u7b26\u5408\u89c6\u89c9\u4e60\u60ef\u5c06 1 \u653e\u5728\u5de6\u4e0a\uff1b\u6ce8\u610f\uff1a\u6807\u51c6 DXF \u6587\u6863\u4e2d 1=\u5de6\u4e0a, 2=\u4e0a\u4e2d, 3=\u53f3\u4e0a, 4=\u5de6\u4e2d, 5=\u6b63\u4e2d, 6=\u53f3\u4e2d, 7=\u5de6\u4e0b, 8=\u4e0b\u4e2d, 9=\u53f3\u4e0b\uff09<\/span>Green border = default attachment point. In standard DXF: 1=Top-Left, 2=Top-Center, 3=Top-Right, 4=Middle-Left, 5=Middle-Center, 6=Middle-Right, 7=Bottom-Left, 8=Bottom-Center, 9=Bottom-Right.<\/span><\/p>\n<\/div>\n\n<div class=\"table-wrap\">\n<table>\n<thead>\n<tr>\n<th>\u53d6\u503c<\/span>Value<\/span><\/th>\n<th>\u82f1\u6587\u7f29\u5199<\/span>Abbreviation<\/span><\/th>\n<th>\u4e2d\u6587\u540d\u79f0<\/span>Name<\/span><\/th>\n<th>\u63d2\u5165\u70b9\u76f8\u5bf9\u4f4d\u7f6e<\/span>Relative Position<\/span><\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr><td>1<\/span><\/td><td>TL<\/td><td>\u5de6\u4e0a\u89d2\uff08\u9ed8\u8ba4\uff09<\/span>Top-Left (default)<\/span><\/td><td>\u6587\u5b57\u6846\u5de6\u4e0a\u89d2\u4f4d\u4e8e\u63d2\u5165\u70b9<\/span>Text box top-left at insertion point<\/span><\/td><\/tr>\n<tr><td>2<\/span><\/td><td>TC<\/td><td>\u4e0a\u4e2d<\/span>Top-Center<\/span><\/td><td>\u6587\u5b57\u6846\u4e0a\u8fb9\u4e2d\u70b9\u4f4d\u4e8e\u63d2\u5165\u70b9<\/span>Text box top-center at insertion point<\/span><\/td><\/tr>\n<tr><td>3<\/span><\/td><td>TR<\/td><td>\u53f3\u4e0a\u89d2<\/span>Top-Right<\/span><\/td><td>\u6587\u5b57\u6846\u53f3\u4e0a\u89d2\u4f4d\u4e8e\u63d2\u5165\u70b9<\/span>Text box top-right at insertion point<\/span><\/td><\/tr>\n<tr><td>4<\/span><\/td><td>ML<\/td><td>\u5de6\u4e2d<\/span>Middle-Left<\/span><\/td><td>\u6587\u5b57\u6846\u5de6\u8fb9\u4e2d\u70b9\u4f4d\u4e8e\u63d2\u5165\u70b9<\/span>Text box middle-left at insertion point<\/span><\/td><\/tr>\n<tr><td>5<\/span><\/td><td>MC<\/td><td>\u6b63\u4e2d\u5fc3<\/span>Middle-Center<\/span><\/td><td>\u6587\u5b57\u6846\u51e0\u4f55\u4e2d\u5fc3\u4f4d\u4e8e\u63d2\u5165\u70b9<\/span>Text box geometric center at insertion point<\/span><\/td><\/tr>\n<tr><td>6<\/span><\/td><td>MR<\/td><td>\u53f3\u4e2d<\/span>Middle-Right<\/span><\/td><td>\u6587\u5b57\u6846\u53f3\u8fb9\u4e2d\u70b9\u4f4d\u4e8e\u63d2\u5165\u70b9<\/span>Text box middle-right at insertion point<\/span><\/td><\/tr>\n<tr><td>7<\/span><\/td><td>BL<\/td><td>\u5de6\u4e0b\u89d2<\/span>Bottom-Left<\/span><\/td><td>\u6587\u5b57\u6846\u5de6\u4e0b\u89d2\u4f4d\u4e8e\u63d2\u5165\u70b9<\/span>Text box bottom-left at insertion point<\/span><\/td><\/tr>\n<tr><td>8<\/span><\/td><td>BC<\/td><td>\u4e0b\u4e2d<\/span>Bottom-Center<\/span><\/td><td>\u6587\u5b57\u6846\u4e0b\u8fb9\u4e2d\u70b9\u4f4d\u4e8e\u63d2\u5165\u70b9<\/span>Text box bottom-center at insertion point<\/span><\/td><\/tr>\n<tr><td>9<\/span><\/td><td>BR<\/td><td>\u53f3\u4e0b\u89d2<\/span>Bottom-Right<\/span><\/td><td>\u6587\u5b57\u6846\u53f3\u4e0b\u89d2\u4f4d\u4e8e\u63d2\u5165\u70b9<\/span>Text box bottom-right at insertion point<\/span><\/td><\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n\n<div class=\"warn-box\">\n\u91cd\u8981\u533a\u5206<\/span>Important Distinction<\/span><\/strong><br\/>\nMTEXT \u6ca1\u6709<\/strong> <code>halign<\/code> \u548c <code>valign<\/code> \u5c5e\u6027\u3002\u82e5\u4f60\u7684\u4ee3\u7801\u540c\u65f6\u904d\u5386 TEXT \u548c MTEXT\uff0c\u8bfb\u53d6 <code>entity.dxf.halign<\/code> \u65f6\u9047\u5230 MTEXT \u4f1a\u629b\u51fa AttributeError\u3002\u5fc5\u987b\u5148\u5224\u65ad\u5b9e\u4f53\u7c7b\u578b\uff1a<code>entity.dxftype() == 'TEXT'<\/code> \u65f6\u624d\u8bfb\u53d6 halign\/valign\u3002<\/span>\nMTEXT does not have<\/strong> <code>halign<\/code> and <code>valign<\/code> attributes. If your code iterates over both TEXT and MTEXT, reading <code>entity.dxf.halign<\/code> on an MTEXT will raise AttributeError. Always check entity type first: only read halign\/valign when <code>entity.dxftype() == 'TEXT'<\/code>.<\/span>\n<\/div>\n<\/section>\n\n\n<section id=\"alignment\">\n<div class=\"section-icon\">\ud83c\udfaf<\/div>\n<h2>\u5bf9\u9f50\u673a\u5236\u5bf9\u6bd4\u603b\u8868<\/span>Alignment Mechanism Comparison<\/span><\/h2>\n\n<h3>TEXT \u5bf9\u9f50\u7ec4\u5408\u8868<\/span>TEXT Alignment Combination<\/span><\/h3>\n<div class=\"table-wrap\">\n<table>\n<thead>\n<tr>\n<th>\u6c34\u5e73\u5bf9\u9f50 halign<\/span>halign (code 72)<\/span><\/th>\n<th>\u53d6\u503c<\/span>Value<\/span><\/th>\n<th>\u5782\u76f4\u5bf9\u9f50 valign<\/span>valign (code 73)<\/span><\/th>\n<th>\u53d6\u503c<\/span>Value<\/span><\/th>\n<th>\u63d2\u5165\u70b9\u5b9e\u9645\u4f4d\u7f6e<\/span>Insertion Point Location<\/span><\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>\u5de6\u5bf9\u9f50\uff08\u9ed8\u8ba4\uff09<\/span>Left (default)<\/span><\/td><td>0<\/span><\/td>\n<td>\u57fa\u7ebf\u5bf9\u9f50\uff08\u9ed8\u8ba4\uff09<\/span>Baseline (default)<\/span><\/td><td>0<\/span><\/td>\n<td>\u6587\u5b57\u5de6\u7aef\u57fa\u7ebf\u5904\uff08\u8fd1\u4f3c\u5de6\u4e0b\u89d2\uff09<\/span>Left end of baseline (approx. lower-left)<\/span><\/td>\n<\/tr>\n<tr>\n<td>\u5c45\u4e2d\u5bf9\u9f50<\/span>Center<\/span><\/td><td>1<\/span><\/td>\n<td>\u5e95\u90e8\u5bf9\u9f50<\/span>Bottom<\/span><\/td><td>1<\/span><\/td>\n<td>\u6587\u5b57\u6c34\u5e73\u4e2d\u5fc3 \u00d7 \u6700\u5e95\u90e8<\/span>Horizontal center \u00d7 bottom<\/span><\/td>\n<\/tr>\n<tr>\n<td>\u53f3\u5bf9\u9f50<\/span>Right<\/span><\/td><td>2<\/span><\/td>\n<td>\u5c45\u4e2d\u5bf9\u9f50<\/span>Middle<\/span><\/td><td>2<\/span><\/td>\n<td>\u6587\u5b57\u53f3\u7aef \u00d7 \u5782\u76f4\u4e2d\u5fc3<\/span>Right end \u00d7 vertical center<\/span><\/td>\n<\/tr>\n<tr>\n<td>\u5bf9\u9f50\uff08Aligned\uff09<\/span>Aligned<\/span><\/td><td>3<\/span><\/td>\n<td>\u9876\u90e8\u5bf9\u9f50<\/span>Top<\/span><\/td><td>3<\/span><\/td>\n<td>\u4e24\u7aef\u62c9\u4f38\u81f3\u6307\u5b9a\u5bbd\u5ea6\uff0c\u9ad8\u5ea6\u81ea\u52a8<\/span>Stretched to width, height auto<\/span><\/td>\n<\/tr>\n<tr>\n<td>\u5e03\u6ee1\uff08Fit\uff09<\/span>Fit<\/span><\/td><td>4<\/span><\/td>\n<td>–<\/td><td>–<\/td>\n<td>\u4e24\u7aef\u5bf9\u9f50\u81f3\u6307\u5b9a\u5bbd\u5ea6\uff0c\u9ad8\u5ea6\u56fa\u5b9a<\/span>Fitted to width, height fixed<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n\n<h3>\u9ed8\u8ba4\u57fa\u51c6\u70b9\u5bf9\u6bd4<\/span>Default Anchor Point Comparison<\/span><\/h3>\n<div class=\"compare-grid\">\n<div class=\"compare-card\">\n<h4>TEXT<\/h4>\n\u9ed8\u8ba4\u63d2\u5165\u70b9\uff1a<\/strong>\u5de6\u7aef\u57fa\u7ebf\u5904<\/span>Default insertion:<\/strong> Left end of baseline<\/span><\/p>\n\u6587\u5b57\u5411\u53f3\u5ef6\u4f38\uff0c\u5b57\u7b26\u5750\u843d\u5728\u57fa\u7ebf\u4e0a\u3002\u4e0b\u4f38\u90e8\uff08g, p, y\uff09\u4f1a\u5411\u4e0b\u8d85\u51fa\u63d2\u5165\u70b9\u3002<\/span>Text extends to the right, characters sit on baseline. Descenders (g, p, y) extend below insertion point.<\/span><\/p>\n\u5bf9\u9f50\u5b57\u6bb5\uff1a<\/strong>halign (72) + valign (73)<\/span>Alignment fields:<\/strong> halign (72) + valign (73)<\/span><\/p>\n<\/div>\n<div class=\"compare-card\">\n<h4>MTEXT<\/h4>\n\u9ed8\u8ba4\u63d2\u5165\u70b9\uff1a<\/strong>\u5de6\u4e0a\u89d2<\/span>Default insertion:<\/strong> Top-left corner<\/span><\/p>\n\u6587\u5b57\u6846\u5411\u53f3\u4e0b\u65b9\u6269\u5c55\u3002\u63d2\u5165\u70b9\u59cb\u7ec8\u4f4d\u4e8e\u6587\u5b57\u6846\u7684\u8fb9\u754c\u4e0a\uff08\u7531 attachment_point \u51b3\u5b9a\u5177\u4f53\u54ea\u4e2a\u89d2\/\u8fb9\uff09\u3002<\/span>Text box expands right and down. Insertion point is always on the text box boundary (specific corner\/edge determined by attachment_point).<\/span><\/p>\n\u5bf9\u9f50\u5b57\u6bb5\uff1a<\/strong>attachment_point (71)<\/span>Alignment field:<\/strong> attachment_point (71)<\/span><\/p>\n<\/div>\n<\/div>\n<\/section>\n\n\n<section id=\"bbox\">\n<div class=\"section-icon\">\ud83d\udcd0<\/div>\n<h2>\u5982\u4f55\u7406\u89e3 BBox\uff08\u8fb9\u754c\u6846\uff09<\/span>Understanding BBox (Bounding Box)<\/span><\/h2>\n\n\u5728 CAD \u7f16\u7a0b\u4e2d\uff0cBBox<\/strong>\uff08Bounding Box\uff0c\u8fb9\u754c\u6846\uff09\u662f\u6307\u80fd\u591f\u5b8c\u5168\u5305\u56f4\u4e00\u4e2a\u5b9e\u4f53\u7684\u6700\u5c0f\u8f74\u5bf9\u9f50\u77e9\u5f62\u3002\u5bf9\u4e8e\u6587\u5b57\u5b9e\u4f53\uff0cBBox \u662f\u8ba1\u7b97\u6587\u5b57\u6e32\u67d3\u540e\u7684\u5b9e\u9645\u5360\u636e\u7a7a\u95f4\u6240\u5f97\u5230\u7684\u77e9\u5f62\u3002<\/span>In CAD programming, BBox<\/strong> (Bounding Box) is the minimum axis-aligned rectangle that fully encloses an entity. For text entities, the BBox is calculated from the actual rendered space occupied by the text.<\/span><\/p>\n\n<h3>TEXT \u7684 BBox<\/span>TEXT BBox<\/span><\/h3>\nTEXT \u7684 BBox \u7531\u4ee5\u4e0b\u56e0\u7d20\u51b3\u5b9a\uff1a<\/span>TEXT’s BBox is determined by:<\/span><\/p>\n<ul style=\"margin-left:1.5rem;margin-bottom:1rem;\">\n<li>\u6587\u5b57\u5185\u5bb9<\/strong>\uff1a\u5b57\u7b26\u6570\u91cf\u51b3\u5b9a\u5bbd\u5ea6<\/span>Text content:<\/strong> character count determines width<\/span><\/li>\n<li>\u6587\u5b57\u9ad8\u5ea6<\/strong>\uff08\u7ec4\u7801 40\uff09\uff1a\u51b3\u5b9a\u4ece\u57fa\u7ebf\u5230 ascent \u7684\u8ddd\u79bb<\/span>Text height<\/strong> (code 40): determines baseline-to-ascent distance<\/span><\/li>\n<li>\u5bbd\u5ea6\u56e0\u5b50<\/strong>\uff08\u7ec4\u7801 41\uff09\uff1a\u6c34\u5e73\u7f29\u653e\u6bd4\u4f8b<\/span>Width factor<\/strong> (code 41): horizontal scale ratio<\/span><\/li>\n<li>\u503e\u659c\u89d2\u5ea6<\/strong>\uff08\u7ec4\u7801 51\uff09\uff1a\u4f7f BBox \u503e\u659c<\/span>Oblique angle<\/strong> (code 51): tilts the BBox<\/span><\/li>\n<li>\u65cb\u8f6c\u89d2\u5ea6<\/strong>\uff08\u7ec4\u7801 50\uff09\uff1a\u4f7f\u6574\u4e2a BBox \u7ed5\u63d2\u5165\u70b9\u65cb\u8f6c<\/span>Rotation angle<\/strong> (code 50): rotates entire BBox around insertion point<\/span><\/li>\n<li>\u6587\u5b57\u6837\u5f0f<\/strong>\uff1a\u4e0d\u540c\u5b57\u4f53\u7684\u5b57\u7b26\u5bbd\u5ea6\u4e0d\u540c<\/span>Text style:<\/strong> different fonts have different character widths<\/span><\/li>\n<\/ul>\n\n<div class=\"diagram-area\">\n <div class=\"diagram-title\">TEXT BBox \u793a\u610f\u56fe<\/span>TEXT BBox Diagram<\/span><\/div>\n <svg viewBox=\"0 0 500 160\" style=\"max-width:500px;width:100%;height:auto;\">\n \n <text x=\"80\" y=\"90\" font-family=\"serif\" font-size=\"50\" fill=\"#1a2e23\" transform=\"rotate(10 80 90)\">Hello<\/text>\n\n \n <rect x=\"75\" y=\"45\" width=\"160\" height=\"65\" fill=\"none\" stroke=\"#059669\" stroke-width=\"2\" stroke-dasharray=\"6,3\" transform=\"rotate(10 80 90)\"\/>\n\n \n <line x1=\"75\" y1=\"90\" x2=\"240\" y2=\"90\" stroke=\"#0d9488\" stroke-width=\"2\" transform=\"rotate(10 80 90)\"\/>\n <text x=\"250\" y=\"95\" font-size=\"11\" fill=\"#0d9488\" font-weight=\"bold\">Baseline<\/text>\n\n \n <circle cx=\"80\" cy=\"90\" r=\"4\" fill=\"#f97316\"\/>\n <text x=\"50\" y=\"105\" font-size=\"11\" fill=\"#f97316\" font-weight=\"bold\">Insert<\/text>\n\n \n <text x=\"320\" y=\"55\" font-size=\"11\" fill=\"#059669\" font-weight=\"bold\">BBox (min X, min Y)<\/text>\n <text x=\"320\" y=\"70\" font-size=\"11\" fill=\"#059669\" font-weight=\"bold\">to (max X, max Y)<\/text>\n <\/svg>\n<\/div>\n\n<h3>MTEXT \u7684 BBox<\/span>MTEXT BBox<\/span><\/h3>\nMTEXT \u7684 BBox \u66f4\u4e3a\u590d\u6742\uff0c\u56e0\u4e3a\uff1a<\/span>MTEXT’s BBox is more complex because:<\/span><\/p>\n<ul style=\"margin-left:1.5rem;margin-bottom:1rem;\">\n<li>\u5305\u542b\u591a\u884c\u6587\u5b57\uff0c\u9ad8\u5ea6\u7531\u884c\u6570\u548c\u884c\u95f4\u8ddd\u51b3\u5b9a<\/span>Contains multiple lines; height depends on line count and spacing<\/span><\/li>\n<li>\u6bcf\u884c\u53ef\u80fd\u6709\u4e0d\u540c\u683c\u5f0f\uff08\u9ad8\u5ea6\u3001\u5b57\u4f53\u3001\u989c\u8272\uff09\uff0c\u5bfc\u81f4\u5404\u884c\u9ad8\u5ea6\u4e0d\u540c<\/span>Each line may have different formatting (height, font, color), causing varying line heights<\/span><\/li>\n<li>\u81ea\u52a8\u6362\u884c\u4f7f\u5bbd\u5ea6\u53d7\u9650\u4e8e\u7ec4\u7801 41\uff08\u53c2\u8003\u77e9\u5f62\u5bbd\u5ea6\uff09<\/span>Automatic wrapping limits width to group code 41 (reference rectangle width)<\/span><\/li>\n<li>\u5185\u8fb9\u8ddd\u548c\u6bb5\u843d\u95f4\u8ddd\u4e5f\u4f1a\u8d21\u732e\u5230\u603b\u9ad8\u5ea6<\/span>Padding and paragraph spacing also contribute to total height<\/span><\/li>\n<\/ul>\n\n<div class=\"tip-box\">\nBBox \u7684\u8ba1\u7b97\u65b9\u5f0f<\/span>How BBox is Calculated<\/span><\/strong><br\/>\n\u5728 ezdxf \u7b49\u5e93\u4e2d\uff0c<code>entity.bbox()<\/code> \u6216 <code>entity.get_bbox()<\/code> \u901a\u5e38\u9700\u8981\u6e32\u67d3\u5f15\u64ce\u652f\u6301\uff08\u5982 matplotlib \u6216\u81ea\u5b9a\u4e49\u5b57\u4f53\u6d4b\u91cf\uff09\u3002\u5b83\u5e76\u975e\u76f4\u63a5\u8bfb\u53d6 DXF \u7ec4\u7801\uff0c\u800c\u662f\u6839\u636e\u5b57\u4f53\u6587\u4ef6\u52a8\u6001\u8ba1\u7b97\u6bcf\u4e2a\u5b57\u7b26\u7684\u8f6e\u5ed3\u540e\u53d6\u5e76\u96c6\u3002\u56e0\u6b64\uff0c\u6ca1\u6709\u5b57\u4f53\u6587\u4ef6\u65f6 BBox \u8ba1\u7b97\u53ef\u80fd\u4e0d\u51c6\u786e\u3002<\/span>\nIn libraries like ezdxf, <code>entity.bbox()<\/code> or <code>entity.get_bbox()<\/code> typically requires a rendering engine (like matplotlib or custom font metrics). It does not directly read DXF group codes but dynamically calculates each character’s outline from the font file and takes the union. Without the font file, BBox calculation may be inaccurate.<\/span>\n<\/div>\n\n<h3>BBox \u7684\u6570\u5b66\u8868\u8fbe<\/span>BBox Mathematical Expression<\/span><\/h3>\n<pre><code># \u4f2a\u4ee3\u7801\uff1aBBox \u7ed3\u6784\nclass BBox:\n min_x: float # \u5305\u56f4\u76d2\u5de6\u8fb9\u754c\n min_y: float # \u5305\u56f4\u76d2\u4e0b\u8fb9\u754c\n min_z: float # \u5305\u56f4\u76d2\u524d\u8fb9\u754c\uff08\u901a\u5e38\u6587\u5b57\u5728 XY \u5e73\u9762\uff0cZ=0\uff09\n max_x: float # \u5305\u56f4\u76d2\u53f3\u8fb9\u754c\n max_y: float # \u5305\u56f4\u76d2\u4e0a\u8fb9\u754c\n max_z: float # \u5305\u56f4\u76d2\u540e\u8fb9\u754c\n\n @property\n def width(self) -> float:\n return self.max_x - self.min_x\n\n @property\n def height(self) -> float:\n return self.max_y - self.min_y\n\n @property\n def center(self) -> Point:\n return Point(\n (self.min_x + self.max_x) \/ 2,\n (self.min_y + self.max_y) \/ 2,\n (self.min_z + self.max_z) \/ 2\n )\n<\/code><\/pre>\n<\/section>\n\n\n<section id=\"size-methods\">\n<div class=\"section-icon\">\ud83d\udccf<\/div>\n<h2>text_size \u4e0e mtext_size \u65b9\u6cd5<\/span>text_size and mtext_size Methods<\/span><\/h2>\n\n\u5728 CAD \u7f16\u7a0b\u5e93\uff08\u5982 ezdxf\uff09\u4e2d\uff0c<code>text_size<\/code> \u548c <code>mtext_size<\/code> \u662f\u7528\u4e8e\u8ba1\u7b97\u6587\u5b57\u5b9e\u4f53\u6e32\u67d3\u5c3a\u5bf8\u7684\u5de5\u5177\u51fd\u6570\u3002\u5b83\u4eec\u5e2e\u52a9\u5f00\u53d1\u8005\u9884\u4f30\u6587\u5b57\u5728\u56fe\u7eb8\u4e0a\u7684\u5b9e\u9645\u5360\u636e\u7a7a\u95f4\u3002<\/span>In CAD programming libraries (like ezdxf), <code>text_size<\/code> and <code>mtext_size<\/code> are utility functions for calculating the rendered size of text entities. They help developers estimate the actual space text occupies on the drawing.<\/span><\/p>\n\n<h3>text_size \u65b9\u6cd5<\/span>text_size Method<\/span><\/h3>\n<code>text_size<\/code> \u4e13\u95e8\u7528\u4e8e\u5355\u884c\u6587\u5b57\uff08TEXT \u5b9e\u4f53\uff09\uff0c\u5176\u8ba1\u7b97\u903b\u8f91\u76f8\u5bf9\u7b80\u5355\uff1a<\/span><code>text_size<\/code> is designed for single-line text (TEXT entities) with relatively simple calculation logic:<\/span><\/p>\n\n<pre><code># ezdxf \u98ce\u683c\u7684 text_size \u8ba1\u7b97\u903b\u8f91\uff08\u793a\u610f\uff09\ndef text_size(text_entity, font_info) -> Tuple[float, float]:\n \"\"\"\n \u8ba1\u7b97 TEXT \u5b9e\u4f53\u7684\u6e32\u67d3\u5bbd\u5ea6\u548c\u9ad8\u5ea6\u3002\n \u8fd4\u56de: (width, height)\n \"\"\"\n text = text_entity.dxf.text # \u7ec4\u7801 1\n height = text_entity.dxf.height # \u7ec4\u7801 40\n width_factor = text_entity.dxf.width # \u7ec4\u7801 41\uff08\u9ed8\u8ba4 1.0\uff09\n oblique = text_entity.dxf.oblique # \u7ec4\u7801 51\uff08\u503e\u659c\u89d2\uff09\n\n # 1. \u83b7\u53d6\u6bcf\u4e2a\u5b57\u7b26\u5728\u6307\u5b9a\u5b57\u4f53\u4e0b\u7684\u5bbd\u5ea6\n char_widths = [font_info.get_char_width(c) for c in text]\n base_width = sum(char_widths) * height * width_factor\n\n # 2. \u503e\u659c\u4f1a\u589e\u52a0\u6709\u6548\u5bbd\u5ea6\n if oblique != 0:\n base_width += height * abs(tan(radians(oblique)))\n\n # 3. \u9ad8\u5ea6 = \u6587\u5b57\u9ad8\u5ea6 + \u4e0b\u4f38\u90e8\uff08\u5982\u679c\u6709\uff09\n # \u6ce8\u610f\uff1a\u4e0d\u540c\u5b57\u4f53\u7684 ascent\/descent \u6bd4\u4f8b\u4e0d\u540c\n actual_height = height * font_info.ascent_ratio\n\n return (base_width, actual_height)\n<\/code><\/pre>\n\n<div class=\"info-box\">\ntext_size \u7684\u5173\u952e\u53c2\u6570<\/span>Key Parameters of text_size<\/span><\/strong><br\/>\n\n– \u6587\u5b57\u5185\u5bb9<\/strong>\uff1a\u76f4\u63a5\u5f71\u54cd\u5bbd\u5ea6<br\/>\n– \u6587\u5b57\u9ad8\u5ea6<\/strong>\uff08\u7ec4\u7801 40\uff09\uff1a\u57fa\u51c6\u9ad8\u5ea6\uff0c\u5b57\u7b26\u6309\u6bd4\u4f8b\u7f29\u653e<br\/>\n– \u5bbd\u5ea6\u56e0\u5b50<\/strong>\uff08\u7ec4\u7801 41\uff09\uff1a\u6c34\u5e73\u65b9\u5411\u7684\u989d\u5916\u7f29\u653e<br\/>\n– \u503e\u659c\u89d2\u5ea6<\/strong>\uff08\u7ec4\u7801 51\uff09\uff1a\u4f7f\u6587\u5b57\u503e\u659c\uff0c\u589e\u52a0\u6709\u6548\u5bbd\u5ea6\n<\/span>\n\n– Text content:<\/strong> directly affects width<br\/>\n– Text height<\/strong> (code 40): base height, characters scale proportionally<br\/>\n– Width factor<\/strong> (code 41): additional horizontal scaling<br\/>\n– Oblique angle<\/strong> (code 51): tilts text, increasing effective width\n<\/span>\n<\/div>\n\n<h3>mtext_size \u65b9\u6cd5<\/span>mtext_size Method<\/span><\/h3>\n<code>mtext_size<\/code> \u7528\u4e8e\u591a\u884c\u6587\u5b57\uff08MTEXT \u5b9e\u4f53\uff09\uff0c\u8ba1\u7b97\u66f4\u590d\u6742\uff0c\u9700\u8981\u89e3\u6790\u683c\u5f0f\u4ee3\u7801\uff1a<\/span><code>mtext_size<\/code> is for multiline text (MTEXT entities) and requires more complex calculation involving format code parsing:<\/span><\/p>\n\n<pre><code># ezdxf \u98ce\u683c\u7684 mtext_size \u8ba1\u7b97\u903b\u8f91\uff08\u793a\u610f\uff09\ndef mtext_size(mtext_entity, font_info) -> Tuple[float, float]:\n \"\"\"\n \u8ba1\u7b97 MTEXT \u5b9e\u4f53\u7684\u6e32\u67d3\u5bbd\u5ea6\u548c\u9ad8\u5ea6\u3002\n \u8fd4\u56de: (width, height)\n \"\"\"\n content = mtext_entity.text # \u7ec4\u7801 1 + 3 \u62fc\u63a5\n nominal_height = mtext_entity.dxf.height # \u7ec4\u7801 40\uff08\u6807\u79f0\u9ad8\u5ea6\uff09\n rect_width = mtext_entity.dxf.width # \u7ec4\u7801 41\uff08\u53c2\u8003\u5bbd\u5ea6\uff09\n line_spacing = mtext_entity.dxf.line_spacing_factor # \u7ec4\u7801 44\n\n # 1. \u89e3\u6790\u683c\u5f0f\u4ee3\u7801\uff08\u5982 \\H0.5x; \u8868\u793a\u9ad8\u5ea6\u4e3a\u6807\u79f0\u7684 0.5 \u500d\uff09\n formatted_lines = parse_mtext_formatting(content)\n\n # 2. \u9010\u884c\u8ba1\u7b97\u5c3a\u5bf8\n max_line_width = 0\n total_height = 0\n for i, line in enumerate(formatted_lines):\n line_height = line.get_height(nominal_height) # \u8003\u8651 \\H \u4ee3\u7801\n line_width = calculate_line_width(line, font_info, line_height)\n max_line_width = max(max_line_width, line_width)\n\n # \u9996\u884c\u4e0d\u52a0\u95f4\u8ddd\uff0c\u540e\u7eed\u884c\u52a0\u884c\u95f4\u8ddd\n if i > 0:\n total_height += line_height * line_spacing\n else:\n total_height += line_height\n\n # 3. \u5982\u679c\u8bbe\u5b9a\u4e86\u53c2\u8003\u5bbd\u5ea6\uff0c\u5b9e\u9645\u5bbd\u5ea6 = min(\u5185\u5bb9\u5bbd\u5ea6, \u53c2\u8003\u5bbd\u5ea6)\n actual_width = max_line_width\n if rect_width > 0:\n actual_width = min(max_line_width, rect_width)\n # \u82e5\u5185\u5bb9\u88ab\u622a\u65ad\u6362\u884c\uff0c\u9ad8\u5ea6\u9700\u8981\u91cd\u65b0\u8ba1\u7b97\n if max_line_width > rect_width:\n total_height = recalc_wrapped_height(formatted_lines, rect_width)\n\n return (actual_width, total_height)\n<\/code><\/pre>\n\n<div class=\"info-box\">\nmtext_size \u7684\u5173\u952e\u53c2\u6570<\/span>Key Parameters of mtext_size<\/span><\/strong><br\/>\n\n– \u6587\u5b57\u5185\u5bb9<\/strong>\uff1a\u9700\u89e3\u6790\u5185\u5d4c\u683c\u5f0f\u4ee3\u7801\uff08\\H, \\W, \\F, \\P \u7b49\uff09<br\/>\n– \u6807\u79f0\u9ad8\u5ea6<\/strong>\uff08\u7ec4\u7801 40\uff09\uff1a\u9ed8\u8ba4\u884c\u9ad8\uff0c\u4f46\u6bcf\u884c\u53ef\u88ab\u683c\u5f0f\u4ee3\u7801\u8986\u76d6<br\/>\n– \u53c2\u8003\u5bbd\u5ea6<\/strong>\uff08\u7ec4\u7801 41\uff09\uff1a\u89e6\u53d1\u81ea\u52a8\u6362\u884c\u7684\u9608\u503c\uff0c0 \u8868\u793a\u4e0d\u6362\u884c<br\/>\n– \u884c\u95f4\u8ddd\u56e0\u5b50<\/strong>\uff08\u7ec4\u7801 44\uff09\uff1a\u63a7\u5236\u884c\u4e0e\u884c\u4e4b\u95f4\u7684\u95f4\u8ddd\u500d\u6570<br\/>\n– \u7ed8\u5236\u65b9\u5411<\/strong>\uff08\u7ec4\u7801 72\uff09\uff1a\u5f71\u54cd\u5bbd\/\u9ad8\u7684\u5b9a\u4e49\uff08\u5de6\u5230\u53f3 vs \u4e0a\u5230\u4e0b\uff09\n<\/span>\n\n– Text content:<\/strong> requires parsing inline format codes (\\H, \\W, \\F, \\P, etc.)<br\/>\n– Nominal height<\/strong> (code 40): default line height, but each line may be overridden by format codes<br\/>\n– Reference width<\/strong> (code 41): threshold for automatic wrapping, 0 means no wrapping<br\/>\n– Line spacing factor<\/strong> (code 44): controls spacing multiplier between lines<br\/>\n– Drawing direction<\/strong> (code 72): affects width\/height definitions (L-R vs T-B)\n<\/span>\n<\/div>\n\n<h3>\u5e38\u89c1 MTEXT \u683c\u5f0f\u4ee3\u7801<\/span>Common MTEXT Format Codes<\/span><\/h3>\n<div class=\"table-wrap\">\n<table>\n<thead>\n<tr>\n<th>\u4ee3\u7801<\/span>Code<\/span><\/th>\n<th>\u542b\u4e49<\/span>Meaning<\/span><\/th>\n<th>\u793a\u4f8b<\/span>Example<\/span><\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr><td><code>\\H<value>;<\/code><\/td><td>\u8bbe\u7f6e\u6587\u5b57\u9ad8\u5ea6<\/span>Set text height<\/span><\/td><td><code>\\H2.5;<\/code> \u9ad8\u5ea6\u4e3a 2.5<\/span>height=2.5<\/span><\/td><\/tr>\n<tr><td><code>\\H<value>x;<\/code><\/td><td>\u8bbe\u7f6e\u76f8\u5bf9\u9ad8\u5ea6\u500d\u6570<\/span>Set relative height multiplier<\/span><\/td><td><code>\\H0.5x;<\/code> \u9ad8\u5ea6\u4e3a\u9ed8\u8ba4\u7684\u4e00\u534a<\/span>half default height<\/span><\/td><\/tr>\n<tr><td><code>\\W<value>;<\/code><\/td><td>\u8bbe\u7f6e\u5bbd\u5ea6\u56e0\u5b50<\/span>Set width factor<\/span><\/td><td><code>\\W1.5;<\/code> \u5bbd\u5ea6\u56e0\u5b50 1.5<\/span>width factor 1.5<\/span><\/td><\/tr>\n<tr><td><code>\\F;<\/code><\/td><td>\u8bbe\u7f6e\u5b57\u4f53<\/span>Set font<\/span><\/td><td><code>\\FSimSun;<\/code> \u5b8b\u4f53<\/span>SimSun font<\/span><\/td><\/tr>\n<tr><td><code>\\C<index>;<\/code><\/td><td>\u8bbe\u7f6e\u989c\u8272\uff08AutoCAD \u989c\u8272\u7d22\u5f15\uff09<\/span>Set color (ACI)<\/span><\/td><td><code>\\C1;<\/code> \u7ea2\u8272<\/span>Red<\/span><\/td><\/tr>\n<tr><td><code>\\P<\/code><\/td><td>\u6bb5\u843d\u6362\u884c<\/span>Paragraph break<\/span><\/td><td><code>Line1\\PLine2<\/code><\/td><\/tr>\n<tr><td><code>\\S<num>^<den>;<\/code><\/td><td>\u5806\u53e0\u5206\u6570<\/span>Stacked fraction<\/span><\/td><td><code>\\S1^2;<\/code> \u4e8c\u5206\u4e4b\u4e00<\/span>1\/2<\/span><\/td><\/tr>\n<tr><td><code>\\L ... \\l<\/code><\/td><td>\u4e0b\u5212\u7ebf<\/span>Underline<\/span><\/td><td><code>\\Ltext\\l<\/code><\/td><\/tr>\n<tr><td><code>\\O ... \\o<\/code><\/td><td>\u4e0a\u5212\u7ebf<\/span>Overline<\/span><\/td><td><code>\\Otext\\o<\/code><\/td><\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n\n<div class=\"tip-box\">\n\u7f16\u7a0b\u5efa\u8bae<\/span>Programming Tip<\/span><\/strong><br\/>\n\u82e5\u4f60\u7684\u5e93\uff08\u5982 ezdxf\uff09\u63d0\u4f9b\u4e86 <code>text_size()<\/code> \u548c <code>mtext_size()<\/code>\uff0c\u4f18\u5148\u4f7f\u7528\u5e93\u81ea\u5e26\u65b9\u6cd5\u800c\u975e\u81ea\u5df1\u8ba1\u7b97\uff0c\u56e0\u4e3a\u5b57\u4f53\u6d4b\u91cf\u548c\u683c\u5f0f\u89e3\u6790\u975e\u5e38\u4f9d\u8d56\u5e95\u5c42\u5b9e\u73b0\u3002\u5982\u679c\u6ca1\u6709\u63d0\u4f9b\uff0c\u53ef\u4ee5\u4f7f\u7528 <code>matplotlib.font_manager<\/code> \u6216 <code>PIL.ImageFont<\/code> \u6765\u8fd1\u4f3c\u6d4b\u91cf\u3002<\/span>\nIf your library (like ezdxf) provides <code>text_size()<\/code> and <code>mtext_size()<\/code>, prefer the built-in methods over manual calculation, as font measurement and format parsing depend heavily on underlying implementation. If not available, you can approximate using <code>matplotlib.font_manager<\/code> or <code>PIL.ImageFont<\/code>.<\/span>\n<\/div>\n<\/section>\n\n\n<section id=\"common-errors\">\n<div class=\"section-icon\">\u26a0\ufe0f<\/div>\n<h2>\u5e38\u89c1\u9519\u8bef\u4e0e\u6ce8\u610f\u4e8b\u9879<\/span>Common Errors & Pitfalls<\/span><\/h2>\n\n<h3>\u9519\u8bef 1\uff1a\u5bf9 MTEXT \u8bfb\u53d6 halign \/ valign<\/span>Error 1: Reading halign\/valign on MTEXT<\/span><\/h3>\n<div class=\"warn-box\">\n\u95ee\u9898<\/span>Problem<\/span><\/strong><br\/>\n\u4ee3\u7801\u540c\u65f6\u904d\u5386 TEXT \u548c MTEXT\uff0c\u76f4\u63a5\u8bbf\u95ee <code>entity.dxf.halign<\/code> \u4f1a\u5728\u9047\u5230 MTEXT \u65f6\u629b\u51fa <code>AttributeError<\/code>\uff0c\u56e0\u4e3a MTEXT \u6ca1\u6709\u8fd9\u4e24\u4e2a\u5c5e\u6027\u3002<\/span>\nCode iterating over both TEXT and MTEXT and directly accessing <code>entity.dxf.halign<\/code> will raise <code>AttributeError<\/code> when encountering MTEXT, because MTEXT does not have these attributes.<\/span>\n<\/div>\n\n<pre><code># \u9519\u8bef\u4ee3\u7801 \u274c\nfor entity in msp:\n h = entity.dxf.halign # MTEXT \u4f1a\u62a5\u9519\uff01\n v = entity.dxf.valign\n\n# \u6b63\u786e\u4ee3\u7801 \u2705\nfor entity in msp:\n if entity.dxftype() == 'TEXT':\n h = entity.dxf.halign\n v = entity.dxf.valign\n elif entity.dxftype() == 'MTEXT':\n att = entity.dxf.attachment_point\n<\/code><\/pre>\n\n<h3>\u9519\u8bef 2\uff1a\u6df7\u6dc6\u9ed8\u8ba4\u63d2\u5165\u70b9<\/span>Error 2: Confusing Default Insertion Points<\/span><\/h3>\n<div class=\"warn-box\">\nProblem<\/span>\u95ee\u9898<\/span><\/strong><br\/>\n\u5c06 TEXT \u7684\u63d2\u5165\u70b9\u5f53\u4f5c\u6587\u5b57\u5de6\u4e0a\u89d2\u5904\u7406\uff0c\u5bfc\u81f4\u6587\u5b57\u4f4d\u7f6e\u5411\u4e0b\u504f\u79fb\u4e00\u4e2a\u6587\u5b57\u9ad8\u5ea6\uff1b\u6216\u5c06 MTEXT \u7684\u63d2\u5165\u70b9\u5f53\u4f5c\u5de6\u4e0a\u89d2\u5904\u7406\u65f6\u5ffd\u7565\u4e86 attachment_point \u7684\u4fee\u6539\u3002<\/span>\nTreating TEXT’s insertion point as the top-left corner causes a downward offset of one text height; or ignoring attachment_point changes when treating MTEXT’s insertion point as top-left.<\/span>\n<\/div>\n\n<h3>\u9519\u8bef 3\uff1a\u5ffd\u7565\u5bf9\u9f50\u70b9\uff08\u7ec4\u7801 11\/21\/31\uff09<\/span>Error 3: Ignoring Alignment Point (codes 11\/21\/31)<\/span><\/h3>\n\u5f53 TEXT \u7684 halign \u6216 valign \u975e\u96f6\u65f6\uff0c\u7ec4\u7801 10\/20\/30 \u4e0d\u518d\u662f\u6587\u5b57\u7684\u5b9e\u9645\u5b9a\u4f4d\u70b9\uff0c\u771f\u6b63\u7684\u5bf9\u9f50\u53c2\u8003\u70b9\u662f\u7ec4\u7801 11\/21\/31\u3002\u82e5\u53ea\u8bfb\u53d6\u63d2\u5165\u70b9\u800c\u5ffd\u7565\u5bf9\u9f50\u70b9\uff0c\u6e32\u67d3\u4f4d\u7f6e\u4f1a\u504f\u5dee\u3002<\/span>When TEXT’s halign or valign is non-zero, group codes 10\/20\/30 are no longer the actual positioning point; the true alignment reference is codes 11\/21\/31. Reading only the insertion point while ignoring the alignment point will cause rendering position errors.<\/span><\/p>\n\n<h3>\u9519\u8bef 4\uff1aMTEXT \u5185\u5bb9\u622a\u65ad<\/span>Error 4: MTEXT Content Truncation<\/span><\/h3>\nMTEXT \u7684\u5185\u5bb9\u8d85\u8fc7 250 \u5b57\u7b26\u65f6\u4f1a\u88ab\u62c6\u5206\u5230\u591a\u4e2a\u7ec4\u7801 3 \u4e2d\u3002\u53ea\u8bfb\u53d6\u7ec4\u7801 1 \u4f1a\u5bfc\u81f4\u5185\u5bb9\u4e0d\u5b8c\u6574\uff0c\u5fc5\u987b\u6309\u987a\u5e8f\u62fc\u63a5\u6240\u6709\u7ec4\u7801 3 \u7684\u503c\u3002<\/span>When MTEXT content exceeds 250 characters, it is split across multiple group code 3 entries. Reading only group code 1 will result in incomplete content; you must concatenate all group code 3 values in order.<\/span><\/p>\n\n<pre><code># ezdxf \u4f1a\u81ea\u52a8\u5904\u7406\u62fc\u63a5\uff0c\u4f46\u539f\u751f DXF \u89e3\u6790\u9700\u6ce8\u610f\n# \u6b63\u786e\u8bfb\u53d6 MTEXT \u5185\u5bb9\u7684\u903b\u8f91\uff1a\ncontent = code_1_value\nfor extra in all_code_3_values:\n content += extra\n<\/code><\/pre>\n\n<div class=\"tip-box\">\n\u6700\u4f73\u5b9e\u8df5<\/span>Best Practices<\/span><\/strong><br\/>\n\n1. \u59cb\u7ec8\u901a\u8fc7 <code>entity.dxftype()<\/code> \u5224\u65ad\u5b9e\u4f53\u7c7b\u578b\u540e\u518d\u8bbf\u95ee\u7279\u5b9a\u5c5e\u6027<br\/>\n2. TEXT \u6e32\u67d3\u65f6\u540c\u65f6\u8003\u8651\u63d2\u5165\u70b9\u548c\u5bf9\u9f50\u70b9\uff0c\u68c0\u67e5 halign\/valign \u662f\u5426\u4e3a 0<br\/>\n3. MTEXT \u8bfb\u53d6\u65f6\u62fc\u63a5\u7ec4\u7801 1 \u548c\u6240\u6709\u7ec4\u7801 3 \u7684\u5185\u5bb9<br\/>\n4. \u8ba1\u7b97 BBox \u65f6\u786e\u4fdd\u5b57\u4f53\u6587\u4ef6\u53ef\u7528\uff0c\u5426\u5219\u4f7f\u7528\u8fd1\u4f3c\u503c<br\/>\n5. \u5904\u7406\u65cb\u8f6c\u6587\u5b57\u65f6\uff0cBBox \u9700\u8981\u5728\u65cb\u8f6c\u540e\u91cd\u65b0\u8ba1\u7b97\uff08\u6216\u8ba1\u7b97\u65cb\u8f6c\u540e\u7684\u89d2\u70b9\uff09\n<\/span>\n\n1. Always check <code>entity.dxftype()<\/code> before accessing entity-specific attributes<br\/>\n2. When rendering TEXT, consider both insertion and alignment points; check if halign\/valign are 0<br\/>\n3. When reading MTEXT, concatenate code 1 with all code 3 values<br\/>\n4. Ensure font files are available when calculating BBox; otherwise use approximations<br\/>\n5. For rotated text, BBox must be recalculated after rotation (or compute rotated corner points)\n<\/span>\n<\/div>\n<\/section>\n\n<div class=\"footnotes\">\n DXF TEXT & MTEXT \u5b9e\u4f53\u53c2\u8003 | \u57fa\u4e8e AutoCAD DXF Reference \u4e0e ezdxf \u6587\u6863\u7f16\u5236<\/span>DXF TEXT & MTEXT Entity Reference | Based on AutoCAD DXF Reference and ezdxf documentation<\/span><\/p>\n<\/div>\n\n<\/div>\n\n\n<script>\nfunction switchLanguage(lang) {\n document.documentElement.lang = lang;\n document.body.className = (lang === 'en') ? 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