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Phraseanet/www/include/jslibs/yui2.8/docs/Bezier.js.html
Alchemy 339d23c06d initial import
2011-02-16 16:09:48 +01:00

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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
<html xmlns:yui="http://yuilibrary.com/rdf/1.0/yui.rdf#">
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<title>API: animation Bezier.js (YUI Library)</title>
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<h1><a href="http://developer.yahoo.com/yui/" title="Yahoo! UI Library">Yahoo! UI Library</a></h1>
<h3>animation&nbsp; <span class="subtitle">2.8.2r1</span></h3>
<a href="./index.html" title="Yahoo! UI Library">Yahoo! UI Library</a>
&gt; <a href="./module_animation.html" title="animation">animation</a>
&gt; Bezier.js (source view)
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<div class="highlight"><pre><span class="cm">/**</span>
<span class="cm"> * Used to calculate Bezier splines for any number of control points.</span>
<span class="cm"> * @class Bezier</span>
<span class="cm"> * @namespace YAHOO.util</span>
<span class="cm"> *</span>
<span class="cm"> */</span>
<span class="nx">YAHOO</span><span class="p">.</span><span class="nx">util</span><span class="p">.</span><span class="nx">Bezier</span> <span class="o">=</span> <span class="k">new</span> <span class="kd">function</span><span class="p">()</span> <span class="p">{</span>
<span class="cm">/**</span>
<span class="cm"> * Get the current position of the animated element based on t.</span>
<span class="cm"> * Each point is an array of &quot;x&quot; and &quot;y&quot; values (0 = x, 1 = y)</span>
<span class="cm"> * At least 2 points are required (start and end).</span>
<span class="cm"> * First point is start. Last point is end.</span>
<span class="cm"> * Additional control points are optional. </span>
<span class="cm"> * @method getPosition</span>
<span class="cm"> * @param {Array} points An array containing Bezier points</span>
<span class="cm"> * @param {Number} t A number between 0 and 1 which is the basis for determining current position</span>
<span class="cm"> * @return {Array} An array containing int x and y member data</span>
<span class="cm"> */</span>
<span class="k">this</span><span class="p">.</span><span class="nx">getPosition</span> <span class="o">=</span> <span class="kd">function</span><span class="p">(</span><span class="nx">points</span><span class="p">,</span> <span class="nx">t</span><span class="p">)</span> <span class="p">{</span>
<span class="kd">var</span> <span class="nx">n</span> <span class="o">=</span> <span class="nx">points</span><span class="p">.</span><span class="nx">length</span><span class="p">;</span>
<span class="kd">var</span> <span class="nx">tmp</span> <span class="o">=</span> <span class="p">[];</span>
<span class="k">for</span> <span class="p">(</span><span class="kd">var</span> <span class="nx">i</span> <span class="o">=</span> <span class="mi">0</span><span class="p">;</span> <span class="nx">i</span> <span class="o">&lt;</span> <span class="nx">n</span><span class="p">;</span> <span class="o">++</span><span class="nx">i</span><span class="p">){</span>
<span class="nx">tmp</span><span class="p">[</span><span class="nx">i</span><span class="p">]</span> <span class="o">=</span> <span class="p">[</span><span class="nx">points</span><span class="p">[</span><span class="nx">i</span><span class="p">][</span><span class="mi">0</span><span class="p">],</span> <span class="nx">points</span><span class="p">[</span><span class="nx">i</span><span class="p">][</span><span class="mi">1</span><span class="p">]];</span> <span class="c1">// save input</span>
<span class="p">}</span>
<span class="k">for</span> <span class="p">(</span><span class="kd">var</span> <span class="nx">j</span> <span class="o">=</span> <span class="mi">1</span><span class="p">;</span> <span class="nx">j</span> <span class="o">&lt;</span> <span class="nx">n</span><span class="p">;</span> <span class="o">++</span><span class="nx">j</span><span class="p">)</span> <span class="p">{</span>
<span class="k">for</span> <span class="p">(</span><span class="nx">i</span> <span class="o">=</span> <span class="mi">0</span><span class="p">;</span> <span class="nx">i</span> <span class="o">&lt;</span> <span class="nx">n</span> <span class="o">-</span> <span class="nx">j</span><span class="p">;</span> <span class="o">++</span><span class="nx">i</span><span class="p">)</span> <span class="p">{</span>
<span class="nx">tmp</span><span class="p">[</span><span class="nx">i</span><span class="p">][</span><span class="mi">0</span><span class="p">]</span> <span class="o">=</span> <span class="p">(</span><span class="mi">1</span> <span class="o">-</span> <span class="nx">t</span><span class="p">)</span> <span class="o">*</span> <span class="nx">tmp</span><span class="p">[</span><span class="nx">i</span><span class="p">][</span><span class="mi">0</span><span class="p">]</span> <span class="o">+</span> <span class="nx">t</span> <span class="o">*</span> <span class="nx">tmp</span><span class="p">[</span><span class="nb">parseInt</span><span class="p">(</span><span class="nx">i</span> <span class="o">+</span> <span class="mi">1</span><span class="p">,</span> <span class="mi">10</span><span class="p">)][</span><span class="mi">0</span><span class="p">];</span>
<span class="nx">tmp</span><span class="p">[</span><span class="nx">i</span><span class="p">][</span><span class="mi">1</span><span class="p">]</span> <span class="o">=</span> <span class="p">(</span><span class="mi">1</span> <span class="o">-</span> <span class="nx">t</span><span class="p">)</span> <span class="o">*</span> <span class="nx">tmp</span><span class="p">[</span><span class="nx">i</span><span class="p">][</span><span class="mi">1</span><span class="p">]</span> <span class="o">+</span> <span class="nx">t</span> <span class="o">*</span> <span class="nx">tmp</span><span class="p">[</span><span class="nb">parseInt</span><span class="p">(</span><span class="nx">i</span> <span class="o">+</span> <span class="mi">1</span><span class="p">,</span> <span class="mi">10</span><span class="p">)][</span><span class="mi">1</span><span class="p">];</span>
<span class="p">}</span>
<span class="p">}</span>
<span class="k">return</span> <span class="p">[</span> <span class="nx">tmp</span><span class="p">[</span><span class="mi">0</span><span class="p">][</span><span class="mi">0</span><span class="p">],</span> <span class="nx">tmp</span><span class="p">[</span><span class="mi">0</span><span class="p">][</span><span class="mi">1</span><span class="p">]</span> <span class="p">];</span>
<span class="p">};</span>
<span class="p">};</span>
</pre></div>
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