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POManually rendering SVG glyphs
 

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    <p>I am currently implementing a simple SVG text renderer. I am puling path information out of an SVG file for the characters I need to draw.</p> <p>This is all the appropriate information for font/characters stored in a JSON object:</p> <pre><code> window.font = { horizAdvX: 487, unitsPerEm: 2048, ascent: 1638, descent: -410, glyphs: { H: { horizAdvX: 1382, path: 'M147 14q64 133 244 604q-68 29 -90 80q19 14 135 37l27 66q85 217 115 327.5t81 391.5q81 -14 153 -73t126 -147q-8 -11 -17.5 -26t-22 -38.5t-23 -43.5t-27 -55.5t-27 -58.5l-31.5 -69t-32 -71t-35.5 -80.5t-36.5 -81.5q282 39 488 51q77 223 157.5 399.5t136.5 235.5 q42 -3 124.5 -47.5t101.5 -79.5q-69 -65 -143 -210.5t-140 -336.5q41 -38 41 -92q0 -39 -16 -71q-28 4 -76 8q-69 -219 -111.5 -425t-42.5 -319q0 -33 4 -53q-41 2 -65 15t-31 28.5t-18 32t-27 22.5q-26 9 -44.5 74.5t-18.5 110.5q0 160 104 510q-75 -5 -255 -24.5 t-253 -20.5q-166 -392 -231 -750q-73 18 -126 62.5t-98 117.5z' }, u: { horizAdvX: 1011, path: 'M174 119q0 98 16 174q43 181 146 386.5t221 291.5q44 0 99 -16t83 -48q-18 -19 -51 -68t-93 -161t-116 -244q-24 -55 -55 -162.5t-31 -156.5q0 -22 15 -37q29 11 73.5 62.5t134.5 174.5q6 9 36 49t47 64t42.5 63t44 75.5t31.5 70.5q19 51 33 84.5t49.5 91.5t77.5 98 q53 0 114 -20.5t80 -44.5q-28 -68 -104.5 -220.5t-115 -259.5t-38.5 -204q0 -51 11.5 -92t22.5 -64.5t11 -32.5q0 -3 -2 -5t-4 -2l-2 -1q-28 0 -88 24t-106 56q-35 29 -50.5 76t-15.5 90q0 44 10 74q-10 1 -52.5 -51t-95.5 -123t-67 -88q-57 -61 -88 -64q-70 3 -138.5 47.5 t-84.5 112.5z' }, // rest of chars ... </code></pre> <p>Using the excellent <a href="http://svgjs.com/" rel="nofollow">svg.js</a> library, I have managed to get this far in the rendering process:</p> <ol> <li>Draw character using path information &amp; <code>SVG.path</code> method</li> <li>Apply a fixed height to character</li> <li>Get bounding box for character path</li> <li>Transform coordinate system so y points down (coordinate system in SVG font is 'upside down')</li> <li>Draw next character using width of previous character(s) as offset</li> <li>Repeat</li> </ol> <p>This does draw text. You can see this working on this jsfiddle:</p> <p><a href="http://jsfiddle.net/dormisher/KVs7E/2/" rel="nofollow">http://jsfiddle.net/dormisher/KVs7E/2/</a></p> <p>The thing is everything is the same height, and the exact same distance apart. I need to know how to use the attributes <code>horiz-adv-x</code>, <code>unites-per-em</code> etc, found in the SVG font file, to get the correct horizontal and vertical positioning.</p> <p>At first it seems simple, <code>horiz-adv-x</code> is simply a scaling value used on the font size, so use that on the horizontal offset and hey presto! But no, doing that ends up with something looking like this:</p> <p><a href="http://jsfiddle.net/dormisher/KVs7E/3/" rel="nofollow">http://jsfiddle.net/dormisher/KVs7E/3/</a></p> <p>What I need to figure out is how the combination of the horizAdvX, and the rest of the simillar values, are used to work out horizontal advance &amp; vertical positioning. I have read through the <a href="http://www.w3.org/TR/SVG/fonts.html" rel="nofollow">W3C</a> spec but it makes little sense to me in terms of this stuff.</p> <p>Be great if anyone could help me out!</p>
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