154 lines
10 KiB
HTML
154 lines
10 KiB
HTML
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<title>API: animation Bezier.js (YUI Library)</title>
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<body id="yahoo-com">
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<div id="doc3" class="yui-t2">
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<h1>Yahoo! UI Library</h1>
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<h3>animation <span class="subtitle">2.2.2</span></h3>
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<p>
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<a href="./index.html">Yahoo! UI Library</a>
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> <a href="./module_animation.html">animation</a>
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> Bezier.js (source view)
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</p>
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<div class="highlight" ><pre><span class="c">/**</span>
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<span class="c"> * Used to calculate Bezier splines for any number of control points.</span>
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<span class="c"> * @class Bezier</span>
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<span class="c"> * @namespace YAHOO.util</span>
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<span class="c"> *</span>
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<span class="c"> */</span>
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<span class="nx">YAHOO</span><span class="o">.</span><span class="nx">util</span><span class="o">.</span><span class="nx">Bezier</span> <span class="o">=</span> <span class="k">new</span> <span class="k">function</span><span class="o">()</span> <span class="o">{</span>
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<span class="c">/**</span>
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<span class="c"> * Get the current position of the animated element based on t.</span>
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<span class="c"> * Each point is an array of "x" and "y" values (0 = x, 1 = y)</span>
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<span class="c"> * At least 2 points are required (start and end).</span>
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<span class="c"> * First point is start. Last point is end.</span>
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<span class="c"> * Additional control points are optional. </span>
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<span class="c"> * @method getPosition</span>
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<span class="c"> * @param {Array} points An array containing Bezier points</span>
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<span class="c"> * @param {Number} t A number between 0 and 1 which is the basis for determining current position</span>
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<span class="c"> * @return {Array} An array containing int x and y member data</span>
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<span class="c"> */</span>
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<span class="k">this</span><span class="o">.</span><span class="nx">getPosition</span> <span class="o">=</span> <span class="k">function</span><span class="o">(</span><span class="nx">points</span><span class="o">,</span> <span class="nx">t</span><span class="o">)</span> <span class="o">{</span>
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<span class="k">var</span> <span class="nx">n</span> <span class="o">=</span> <span class="nx">points</span><span class="o">.</span><span class="nx">length</span><span class="o">;</span>
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<span class="k">var</span> <span class="nx">tmp</span> <span class="o">=</span> <span class="o">[];</span>
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<span class="k">for</span> <span class="o">(</span><span class="k">var</span> <span class="nx">i</span> <span class="o">=</span> <span class="m">0</span><span class="o">;</span> <span class="nx">i</span> <span class="o"><</span> <span class="nx">n</span><span class="o">;</span> <span class="o">++</span><span class="nx">i</span><span class="o">){</span>
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<span class="nx">tmp</span><span class="o">[</span><span class="nx">i</span><span class="o">]</span> <span class="o">=</span> <span class="o">[</span><span class="nx">points</span><span class="o">[</span><span class="nx">i</span><span class="o">][</span><span class="m">0</span><span class="o">],</span> <span class="nx">points</span><span class="o">[</span><span class="nx">i</span><span class="o">][</span><span class="m">1</span><span class="o">]];</span> <span class="c">// save input</span>
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<span class="c"></span> <span class="o">}</span>
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<span class="k">for</span> <span class="o">(</span><span class="k">var</span> <span class="nx">j</span> <span class="o">=</span> <span class="m">1</span><span class="o">;</span> <span class="nx">j</span> <span class="o"><</span> <span class="nx">n</span><span class="o">;</span> <span class="o">++</span><span class="nx">j</span><span class="o">)</span> <span class="o">{</span>
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<span class="k">for</span> <span class="o">(</span><span class="nx">i</span> <span class="o">=</span> <span class="m">0</span><span class="o">;</span> <span class="nx">i</span> <span class="o"><</span> <span class="nx">n</span> <span class="o">-</span> <span class="nx">j</span><span class="o">;</span> <span class="o">++</span><span class="nx">i</span><span class="o">)</span> <span class="o">{</span>
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<span class="nx">tmp</span><span class="o">[</span><span class="nx">i</span><span class="o">][</span><span class="m">0</span><span class="o">]</span> <span class="o">=</span> <span class="o">(</span><span class="m">1</span> <span class="o">-</span> <span class="nx">t</span><span class="o">)</span> <span class="o">*</span> <span class="nx">tmp</span><span class="o">[</span><span class="nx">i</span><span class="o">][</span><span class="m">0</span><span class="o">]</span> <span class="o">+</span> <span class="nx">t</span> <span class="o">*</span> <span class="nx">tmp</span><span class="o">[</span><span class="nb">parseInt</span><span class="o">(</span><span class="nx">i</span> <span class="o">+</span> <span class="m">1</span><span class="o">,</span> <span class="m">10</span><span class="o">)][</span><span class="m">0</span><span class="o">];</span>
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<span class="nx">tmp</span><span class="o">[</span><span class="nx">i</span><span class="o">][</span><span class="m">1</span><span class="o">]</span> <span class="o">=</span> <span class="o">(</span><span class="m">1</span> <span class="o">-</span> <span class="nx">t</span><span class="o">)</span> <span class="o">*</span> <span class="nx">tmp</span><span class="o">[</span><span class="nx">i</span><span class="o">][</span><span class="m">1</span><span class="o">]</span> <span class="o">+</span> <span class="nx">t</span> <span class="o">*</span> <span class="nx">tmp</span><span class="o">[</span><span class="nb">parseInt</span><span class="o">(</span><span class="nx">i</span> <span class="o">+</span> <span class="m">1</span><span class="o">,</span> <span class="m">10</span><span class="o">)][</span><span class="m">1</span><span class="o">];</span>
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<span class="o">}</span>
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<span class="o">}</span>
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<span class="k">return</span> <span class="o">[</span> <span class="nx">tmp</span><span class="o">[</span><span class="m">0</span><span class="o">][</span><span class="m">0</span><span class="o">],</span> <span class="nx">tmp</span><span class="o">[</span><span class="m">0</span><span class="o">][</span><span class="m">1</span><span class="o">]</span> <span class="o">];</span>
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<span class="o">};</span>
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<span class="o">};</span>
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</pre></div>
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<h4>Modules</h4>
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<li class="selected"><a href="module_animation.html">animation</a></li>
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<li class=""><a href="module_dom.html">dom</a></li>
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<li class=""><a href="module_dragdrop.html">dragdrop</a></li>
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<li class=""><a href="module_element.html">element</a></li>
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<li class=""><a href="module_history.html">history</a></li>
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<li class=""><a href="module_yahoo.html">yahoo</a></li>
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<h4>Classes</h4>
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<ul class="content">
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<li class=""><a href="YAHOO.util.Anim.html">YAHOO.util.Anim</a></li>
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<li class=""><a href="YAHOO.util.AnimMgr.html">YAHOO.util.AnimMgr</a></li>
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<li class=""><a href="YAHOO.util.Bezier.html">YAHOO.util.Bezier</a></li>
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<li class=""><a href="YAHOO.util.ColorAnim.html">YAHOO.util.ColorAnim</a></li>
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<li class=""><a href="YAHOO.util.Easing.html">YAHOO.util.Easing</a></li>
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<li class=""><a href="YAHOO.util.Motion.html">YAHOO.util.Motion</a></li>
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<li class=""><a href="YAHOO.util.Scroll.html">YAHOO.util.Scroll</a></li>
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</ul>
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</div>
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<div class="module">
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<h4>Files</h4>
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<ul class="content">
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<li class=""><a href="Anim.js.html">Anim.js</a></li>
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<li class=""><a href="AnimMgr.js.html">AnimMgr.js</a></li>
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<li class="selected"><a href="Bezier.js.html">Bezier.js</a></li>
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<li class=""><a href="ColorAnim.js.html">ColorAnim.js</a></li>
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<li class=""><a href="Easing.js.html">Easing.js</a></li>
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<li class=""><a href="Motion.js.html">Motion.js</a></li>
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<li class=""><a href="Scroll.js.html">Scroll.js</a></li>
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</ul>
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</div>
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</div>
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</div>
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<hr />
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Copyright © 2007 Yahoo! Inc. All rights reserved.
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