171 lines
7.6 KiB
Groff
171 lines
7.6 KiB
Groff
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<title>textAscent() | reference | Processing.js</title>
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<span class="tagline">a port of the Processing Visualization Language</span>
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<div class="span11">
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<table cellpadding="0" cellspacing="0" border="0" class="ref-item">
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<tr class="name-row">
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<th scope="row">Name</th>
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<td><h3>textAscent()</h3></td>
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</tr>
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<tr class="pjs">
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<th scope="row">Processing.js Behavior</th>
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<td>Font support for the Canvas element varies across browsers. FireFox currently has the best support, but still uses a pre-defined set of fonts. (Documentation to follow soon.) Good alternatives to the browser's Canvas-font functions are available: such as the <a href="http://bocoup.com/processing-js/docs/index.php?page=Cross-Browser%20Canvas%20Fonts">Glyph method</a>. See also: <a href="http://jim.studt.net/canvastext/">Canvas Text</a>, <a href="http://canvas.burnttoys.net/bauhaus.html">BurntToys Bauhaus</a>.
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<br /><br /><p><b>Please use the following demos to learn how fonts can be rendered in Firefox with Processing.js: <a href="http://processingjs.org/learning/basic/letters">Letters</a>, <a href="http://processingjs.org/learning/basic/words">Words</a>, <a href="http://processingjs.org/source/text-width/text-width.html">width()</a></b></p>
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</td>
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</tr>
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<tr class="">
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<th scope="row">Examples</th>
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<td><div class="example"><img src="textAscent_.gif" alt="example pic" /><pre class="margin">PFont font;
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font = loadFont("FFScala.ttf");
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textFont(font);
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textSize(32);
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float ascent = textAscent();
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text("dp", 0, 70);
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line(0, 70-ascent, 100, 70-ascent);
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textSize(64);
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ascent = textAscent();
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text("dp", 35, 70);
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line(35, 70-ascent, 100, 70-ascent);</pre></div></td>
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</tr>
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<tr class="">
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<th scope="row">Description</th>
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<td><p>Returns ascent of the current font at its current size. This information is useful for determining the height of the font above the baseline.
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For example, adding the <b>textAscent()</b> and <b>textDescent()</b> values will give you the total height of the line.</p>
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</td>
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</tr>
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<tr class="">
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<th scope="row">Syntax</th>
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<td><pre>textAscent()</pre></td>
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</tr>
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<tr class="">
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<th scope="row">Returns</th>
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<td>Float</td>
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</tr>
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<tr class="">
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<th scope="row">Usage</th>
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<td>Web & Application</td>
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</tr>
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<tr class="">
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<th scope="row">Related</th>
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<td> <a href="textDescent_.1">textDescent()</a></td>
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</tr>
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</table>
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<div class="cclicense">
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<p>This reference is licensed under the CC BY-NC-SA 2.0 license:</p>
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Processing is an open visualization language developed by
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<a href="http://benfry.com/">Ben Fry</a> & <a href="http://reas.com/">Casey Reas</a>,
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and originally ported to Javascript by
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<a href="http://ejohn.org/blog/processingjs/">John Resig</a>.
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