cannon
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A lightweight 3D physics engine written in JavaScript.
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<em>API Docs for: 0.6.1</em>
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<h1>Heightfield Class</h1>
<div class="box meta">
<div class="extends">
Extends <a href="../classes/Shape.html" class="crosslink">Shape</a>
</div>
<div class="foundat">
Defined in: <a href="../files/src_shapes_Heightfield.js.html#l8"><code>src/shapes/Heightfield.js:8</code></a>
</div>
</div>
<div class="box intro">
<p>Heightfield shape class. Height data is given as an array. These data points are spread out evenly with a given distance.</p>
</div>
<div class="constructor">
<h2>Constructor</h2>
<div id="method_Heightfield" class="method item">
<h3 class="name"><code>Heightfield</code></h3>
<div class="args">
<span class="paren">(</span><ul class="args-list inline commas">
<li class="arg">
<code>data</code>
</li>
<li class="arg">
<code>options</code>
</li>
</ul><span class="paren">)</span>
</div>
<div class="meta">
<p>
Defined in
<a href="../files/src_shapes_Heightfield.js.html#l8"><code>src/shapes/Heightfield.js:8</code></a>
</p>
</div>
<div class="description">
</div>
<div class="params">
<h4>Parameters:</h4>
<ul class="params-list">
<li class="param">
<code class="param-name">data</code>
<span class="type">Array</span>
<div class="param-description">
<p>An array of Y values that will be used to construct the terrain.</p>
</div>
</li>
<li class="param">
<code class="param-name">options</code>
<span class="type">Object</span>
<div class="param-description">
</div>
<ul class="params-list">
<li class="param">
<code class="param-name optional">[minValue]</code>
<span class="type">Number</span>
<span class="flag optional" title="This parameter is optional.">optional</span>
<div class="param-description">
<p>Minimum value of the data points in the data array. Will be computed automatically if not given.</p>
</div>
</li>
<li class="param">
<code class="param-name optional">[maxValue]</code>
<span class="type">Number</span>
<span class="flag optional" title="This parameter is optional.">optional</span>
<div class="param-description">
<p>Maximum value.</p>
</div>
</li>
<li class="param">
<code class="param-name optional">[elementSize=0.1]</code>
<span class="type">Number</span>
<span class="flag optional" title="This parameter is optional.">optional</span>
<div class="param-description">
<p>World spacing between the data points in X direction.</p>
</div>
</li>
</ul>
</li>
</ul>
</div>
<div class="example">
<h4>Example:</h4>
<div class="example-content">
<pre class="code prettyprint"><code>// Generate some height data (y-values).
var data = [];
for(var i = 0; i < 1000; i++){
var y = 0.5 * Math.cos(0.2 * i);
data.push(y);
}
// Create the heightfield shape
var heightfieldShape = new Heightfield(data, {
elementSize: 1 // Distance between the data points in X and Y directions
});
var heightfieldBody = new Body();
heightfieldBody.addShape(heightfieldShape);
world.addBody(heightfieldBody);
</code></pre>
</div>
</div>
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<div id="classdocs" class="tabview">
<ul class="api-class-tabs">
<li class="api-class-tab index"><a href="#index">Index</a></li>
<li class="api-class-tab methods"><a href="#methods">Methods</a></li>
<li class="api-class-tab properties"><a href="#properties">Properties</a></li>
</ul>
<div>
<div id="index" class="api-class-tabpanel index">
<h2 class="off-left">Item Index</h2>
<div class="index-section methods">
<h3>Methods</h3>
<ul class="index-list methods extends">
<li class="index-item method inherited">
<a href="#method_calculateLocalInertia">calculateLocalInertia</a>
</li>
<li class="index-item method">
<a href="#method_getConvexTrianglePillar">getConvexTrianglePillar</a>
</li>
<li class="index-item method">
<a href="#method_getIndexOfPosition">getIndexOfPosition</a>
</li>
<li class="index-item method">
<a href="#method_getRectMinMax">getRectMinMax</a>
</li>
<li class="index-item method">
<a href="#method_setHeightValueAtIndex">setHeightValueAtIndex</a>
</li>
<li class="index-item method">
<a href="#method_update">update</a>
</li>
<li class="index-item method inherited">
<a href="#method_updateBoundingSphereRadius">updateBoundingSphereRadius</a>
</li>
<li class="index-item method">
<a href="#method_updateMaxValue">updateMaxValue</a>
</li>
<li class="index-item method">
<a href="#method_updateMinValue">updateMinValue</a>
</li>
<li class="index-item method inherited">
<a href="#method_volume">volume</a>
</li>
</ul>
</div>
<div class="index-section properties">
<h3>Properties</h3>
<ul class="index-list properties extends">
<li class="index-item property inherited">
<a href="#property_boundingSphereRadius">boundingSphereRadius</a>
</li>
<li class="index-item property inherited">
<a href="#property_collisionResponse">collisionResponse</a>
</li>
<li class="index-item property">
<a href="#property_data">data</a>
</li>
<li class="index-item property">
<a href="#property_elementSize">elementSize</a>
</li>
<li class="index-item property inherited">
<a href="#property_id">id</a>
</li>
<li class="index-item property inherited">
<a href="#property_material">material</a>
</li>
<li class="index-item property">
<a href="#property_maxValue">maxValue</a>
</li>
<li class="index-item property">
<a href="#property_minValue">minValue</a>
</li>
<li class="index-item property inherited">
<a href="#property_type">type</a>
</li>
</ul>
</div>
</div>
<div id="methods" class="api-class-tabpanel">
<h2 class="off-left">Methods</h2>
<div id="method_calculateLocalInertia" class="method item inherited">
<h3 class="name"><code>calculateLocalInertia</code></h3>
<span class="paren">()</span>
<span class="returns-inline">
<span class="type"><a href="../classes/Vec3.html" class="crosslink">Vec3</a></span>
</span>
<div class="meta">
<p>Inherited from
<a href="../classes/Shape.html#method_calculateLocalInertia">Shape</a>:
<a href="../files/src_shapes_Shape.js.html#l68"><code>src/shapes/Shape.js:68</code></a>
</p>
</div>
<div class="description">
<p>Calculates the inertia in the local frame for this shape.</p>
</div>
<div class="returns">
<h4>Returns:</h4>
<div class="returns-description">
<span class="type"><a href="../classes/Vec3.html" class="crosslink">Vec3</a></span>:
</div>
</div>
</div>
<div id="method_getConvexTrianglePillar" class="method item">
<h3 class="name"><code>getConvexTrianglePillar</code></h3>
<div class="args">
<span class="paren">(</span><ul class="args-list inline commas">
<li class="arg">
<code>i</code>
</li>
<li class="arg">
<code>j</code>
</li>
<li class="arg">
<code>getUpperTriangle</code>
</li>
</ul><span class="paren">)</span>
</div>
<div class="meta">
<p>
Defined in
<a href="../files/src_shapes_Heightfield.js.html#l257"><code>src/shapes/Heightfield.js:257</code></a>
</p>
</div>
<div class="description">
<p>Get a triangle in the terrain in the form of a triangular convex shape.</p>
</div>
<div class="params">
<h4>Parameters:</h4>
<ul class="params-list">
<li class="param">
<code class="param-name">i</code>
<span class="type">Integer</span>
<div class="param-description">
</div>
</li>
<li class="param">
<code class="param-name">j</code>
<span class="type">Integer</span>
<div class="param-description">
</div>
</li>
<li class="param">
<code class="param-name">getUpperTriangle</code>
<span class="type">Boolean</span>
<div class="param-description">
</div>
</li>
</ul>
</div>
</div>
<div id="method_getIndexOfPosition" class="method item">
<h3 class="name"><code>getIndexOfPosition</code></h3>
<div class="args">
<span class="paren">(</span><ul class="args-list inline commas">
<li class="arg">
<code>x</code>
</li>
<li class="arg">
<code>y</code>
</li>
<li class="arg">
<code>result</code>
</li>
<li class="arg">
<code>clamp</code>
</li>
</ul><span class="paren">)</span>
</div>
<span class="returns-inline">
<span class="type">Boolean</span>
</span>
<div class="meta">
<p>
Defined in
<a href="../files/src_shapes_Heightfield.js.html#l191"><code>src/shapes/Heightfield.js:191</code></a>
</p>
</div>
<div class="description">
<p>Get the index of a local position on the heightfield. The indexes indicate the rectangles, so if your terrain is made of N x N height data points, you will have rectangle indexes ranging from 0 to N-1.</p>
</div>
<div class="params">
<h4>Parameters:</h4>
<ul class="params-list">
<li class="param">
<code class="param-name">x</code>
<span class="type">Number</span>
<div class="param-description">
</div>
</li>
<li class="param">
<code class="param-name">y</code>
<span class="type">Number</span>
<div class="param-description">
</div>
</li>
<li class="param">
<code class="param-name">result</code>
<span class="type">Array</span>
<div class="param-description">
<p>Two-element array</p>
</div>
</li>
<li class="param">
<code class="param-name">clamp</code>
<span class="type">Boolean</span>
<div class="param-description">
<p>If the position should be clamped to the heightfield edge.</p>
</div>
</li>
</ul>
</div>
<div class="returns">
<h4>Returns:</h4>
<div class="returns-description">
<span class="type">Boolean</span>:
</div>
</div>
</div>
<div id="method_getRectMinMax" class="method item">
<h3 class="name"><code>getRectMinMax</code></h3>
<div class="args">
<span class="paren">(</span><ul class="args-list inline commas">
<li class="arg">
<code>iMinX</code>
</li>
<li class="arg">
<code>iMinY</code>
</li>
<li class="arg">
<code>iMaxX</code>
</li>
<li class="arg">
<code>iMaxY</code>
</li>
<li class="arg">
<code class="optional">[result]</code>
</li>
</ul><span class="paren">)</span>
</div>
<span class="returns-inline">
<span class="type">Array</span>
</span>
<div class="meta">
<p>
Defined in
<a href="../files/src_shapes_Heightfield.js.html#l162"><code>src/shapes/Heightfield.js:162</code></a>
</p>
</div>
<div class="description">
<p>Get max/min in a rectangle in the matrix data</p>
</div>
<div class="params">
<h4>Parameters:</h4>
<ul class="params-list">
<li class="param">
<code class="param-name">iMinX</code>
<span class="type">Integer</span>
<div class="param-description">
</div>
</li>
<li class="param">
<code class="param-name">iMinY</code>
<span class="type">Integer</span>
<div class="param-description">
</div>
</li>
<li class="param">
<code class="param-name">iMaxX</code>
<span class="type">Integer</span>
<div class="param-description">
</div>
</li>
<li class="param">
<code class="param-name">iMaxY</code>
<span class="type">Integer</span>
<div class="param-description">
</div>
</li>
<li class="param">
<code class="param-name optional">[result]</code>
<span class="type">Array</span>
<span class="flag optional" title="This parameter is optional.">optional</span>
<div class="param-description">
<p>An array to store the results in.</p>
</div>
</li>
</ul>
</div>
<div class="returns">
<h4>Returns:</h4>
<div class="returns-description">
<span class="type">Array</span>:
<p>The result array, if it was passed in. Minimum will be at position 0 and max at 1.</p>
</div>
</div>
</div>
<div id="method_setHeightValueAtIndex" class="method item">
<h3 class="name"><code>setHeightValueAtIndex</code></h3>
<div class="args">
<span class="paren">(</span><ul class="args-list inline commas">
<li class="arg">
<code>xi</code>
</li>
<li class="arg">
<code>yi</code>
</li>
<li class="arg">
<code>value</code>
</li>
</ul><span class="paren">)</span>
</div>
<div class="meta">
<p>
Defined in
<a href="../files/src_shapes_Heightfield.js.html#l136"><code>src/shapes/Heightfield.js:136</code></a>
</p>
</div>
<div class="description">
<p>Set the height value at an index. Don't forget to update maxValue and minValue after you're done.</p>
</div>
<div class="params">
<h4>Parameters:</h4>
<ul class="params-list">
<li class="param">
<code class="param-name">xi</code>
<span class="type">Integer</span>
<div class="param-description">
</div>
</li>
<li class="param">
<code class="param-name">yi</code>
<span class="type">Integer</span>
<div class="param-description">
</div>
</li>
<li class="param">
<code class="param-name">value</code>
<span class="type">Number</span>
<div class="param-description">
</div>
</li>
</ul>
</div>
</div>
<div id="method_update" class="method item">
<h3 class="name"><code>update</code></h3>
<span class="paren">()</span>
<div class="meta">
<p>
Defined in
<a href="../files/src_shapes_Heightfield.js.html#l92"><code>src/shapes/Heightfield.js:92</code></a>
</p>
</div>
<div class="description">
<p>Call whenever you change the data array.</p>
</div>
</div>
<div id="method_updateBoundingSphereRadius" class="method item inherited">
<h3 class="name"><code>updateBoundingSphereRadius</code></h3>
<span class="paren">()</span>
<span class="returns-inline">
<span class="type">Number</span>
</span>
<div class="meta">
<p>Inherited from
<a href="../classes/Shape.html#method_updateBoundingSphereRadius">Shape</a>:
<a href="../files/src_shapes_Shape.js.html#l50"><code>src/shapes/Shape.js:50</code></a>
</p>
</div>
<div class="description">
<p>Computes the bounding sphere radius. The result is stored in the property .boundingSphereRadius</p>
</div>
<div class="returns">
<h4>Returns:</h4>
<div class="returns-description">
<span class="type">Number</span>:
</div>
</div>
</div>
<div id="method_updateMaxValue" class="method item">
<h3 class="name"><code>updateMaxValue</code></h3>
<span class="paren">()</span>
<div class="meta">
<p>
Defined in
<a href="../files/src_shapes_Heightfield.js.html#l118"><code>src/shapes/Heightfield.js:118</code></a>
</p>
</div>
<div class="description">
<p>Update the .maxValue property</p>
</div>
</div>
<div id="method_updateMinValue" class="method item">
<h3 class="name"><code>updateMinValue</code></h3>
<span class="paren">()</span>
<div class="meta">
<p>
Defined in
<a href="../files/src_shapes_Heightfield.js.html#l100"><code>src/shapes/Heightfield.js:100</code></a>
</p>
</div>
<div class="description">
<p>Update the .minValue property</p>
</div>
</div>
<div id="method_volume" class="method item inherited">
<h3 class="name"><code>volume</code></h3>
<span class="paren">()</span>
<span class="returns-inline">
<span class="type">Number</span>
</span>
<div class="meta">
<p>Inherited from
<a href="../classes/Shape.html#method_volume">Shape</a>:
<a href="../files/src_shapes_Shape.js.html#l59"><code>src/shapes/Shape.js:59</code></a>
</p>
</div>
<div class="description">
<p>Get the volume of this shape</p>
</div>
<div class="returns">
<h4>Returns:</h4>
<div class="returns-description">
<span class="type">Number</span>:
</div>
</div>
</div>
</div>
<div id="properties" class="api-class-tabpanel">
<h2 class="off-left">Properties</h2>
<div id="property_boundingSphereRadius" class="property item inherited">
<h3 class="name"><code>boundingSphereRadius</code></h3>
<span class="type">Number</span>
<div class="meta">
<p>Inherited from
<a href="../classes/Shape.html#property_boundingSphereRadius">Shape</a>:
<a href="../files/src_shapes_Shape.js.html#l31"><code>src/shapes/Shape.js:31</code></a>
</p>
</div>
<div class="description">
<p>The local bounding sphere radius of this shape.</p>
</div>
</div>
<div id="property_collisionResponse" class="property item inherited">
<h3 class="name"><code>collisionResponse</code></h3>
<span class="type">Boolean</span>
<div class="meta">
<p>Inherited from
<a href="../classes/Shape.html#property_collisionResponse">Shape</a>:
<a href="../files/src_shapes_Shape.js.html#l37"><code>src/shapes/Shape.js:37</code></a>
</p>
</div>
<div class="description">
<p>Whether to produce contact forces when in contact with other bodies. Note that contacts will be generated, but they will be disabled.</p>
</div>
</div>
<div id="property_data" class="property item">
<h3 class="name"><code>data</code></h3>
<span class="type">Array</span>
<div class="meta">
<p>
Defined in
<a href="../files/src_shapes_Heightfield.js.html#l43"><code>src/shapes/Heightfield.js:43</code></a>
</p>
</div>
<div class="description">
<p>An array of numbers, or height values, that are spread out along the x axis.</p>
</div>
</div>
<div id="property_elementSize" class="property item">
<h3 class="name"><code>elementSize</code></h3>
<span class="type">Number</span>
<div class="meta">
<p>
Defined in
<a href="../files/src_shapes_Heightfield.js.html#l61"><code>src/shapes/Heightfield.js:61</code></a>
</p>
</div>
<div class="description">
<p>The width of each element</p>
</div>
</div>
<div id="property_id" class="property item inherited">
<h3 class="name"><code>id</code></h3>
<span class="type">Number</span>
<div class="meta">
<p>Inherited from
<a href="../classes/Shape.html#property_id">Shape</a>:
<a href="../files/src_shapes_Shape.js.html#l17"><code>src/shapes/Shape.js:17</code></a>
</p>
</div>
<div class="description">
<p>Identifyer of the Shape.</p>
</div>
</div>
<div id="property_material" class="property item inherited">
<h3 class="name"><code>material</code></h3>
<span class="type"><a href="../classes/Material.html" class="crosslink">Material</a></span>
<div class="meta">
<p>Inherited from
<a href="../classes/Shape.html#property_material">Shape</a>:
<a href="../files/src_shapes_Shape.js.html#l43"><code>src/shapes/Shape.js:43</code></a>
</p>
</div>
<div class="description">
</div>
</div>
<div id="property_maxValue" class="property item">
<h3 class="name"><code>maxValue</code></h3>
<span class="type">Number</span>
<div class="meta">
<p>
Defined in
<a href="../files/src_shapes_Heightfield.js.html#l49"><code>src/shapes/Heightfield.js:49</code></a>
</p>
</div>
<div class="description">
<p>Max value of the data</p>
</div>
</div>
<div id="property_minValue" class="property item">
<h3 class="name"><code>minValue</code></h3>
<span class="type">Number</span>
<div class="meta">
<p>
Defined in
<a href="../files/src_shapes_Heightfield.js.html#l55"><code>src/shapes/Heightfield.js:55</code></a>
</p>
</div>
<div class="description">
<p>Max value of the data</p>
</div>
</div>
<div id="property_type" class="property item inherited">
<h3 class="name"><code>type</code></h3>
<span class="type">Number</span>
<div class="meta">
<p>Inherited from
<a href="../classes/Shape.html#property_type">Shape</a>:
<a href="../files/src_shapes_Shape.js.html#l23"><code>src/shapes/Shape.js:23</code></a>
</p>
</div>
<div class="description">
<p>The type of this shape. Must be set to an int > 0 by subclasses.</p>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
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