p2s

<!DOCTYPE html> <html lang="en"> <head> <meta charset="utf-8"> <title>vec2 - p2.js</title> <link rel="stylesheet" href="http://yui.yahooapis.com/3.9.1/build/cssgrids/cssgrids-min.css"> <link rel="stylesheet" href="../assets/vendor/prettify/prettify-min.css"> <link rel="stylesheet" href="../assets/css/main.css" id="site_styles"> <link rel="icon" href="../assets/favicon.ico"> <script src="http://yui.yahooapis.com/combo?3.9.1/build/yui/yui-min.js"></script> </head> <body class="yui3-skin-sam"> <div id="doc"> <div id="hd" class="yui3-g header"> <div class="yui3-u-3-4"> <h1><img src="../assets/css/logo.png" title="p2.js" width="117" height="52"></h1> </div> <div class="yui3-u-1-4 version"> <em>API Docs for: 0.7.1</em> </div> </div> <div id="bd" class="yui3-g"> <div class="yui3-u-1-4"> <div id="docs-sidebar" class="sidebar apidocs"> <div id="api-list"> <h2 class="off-left">APIs</h2> <div id="api-tabview" class="tabview"> <ul class="tabs"> <li><a href="#api-classes">Classes</a></li> <li><a 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</label> </div> <div class="apidocs"> <div id="docs-main"> <div class="content"> <h1>vec2 Class</h1> <div class="box meta"> <div class="foundat"> Defined in: <a href="../files/src_math_vec2.js.html#l23"><code>src/math/vec2.js:23</code></a> </div> </div> <div class="box intro"> <p>The vec2 object from glMatrix, with some extensions and some removed methods. See <a href="http://glmatrix.net">http://glmatrix.net</a>.</p> </div> <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> </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"> <li class="index-item method"> <a href="#method_add">add</a> <span class="flag static">static</span> </li> <li class="index-item method"> <a href="#method_centroid">centroid</a> <span class="flag static">static</span> </li> <li class="index-item method"> <a href="#method_clone">clone</a> <span class="flag static">static</span> </li> <li class="index-item method"> <a href="#method_copy">copy</a> <span class="flag static">static</span> </li> <li class="index-item method"> <a href="#method_create">create</a> <span class="flag static">static</span> </li> <li class="index-item method"> <a href="#method_crossLength">crossLength</a> <span class="flag static">static</span> </li> <li class="index-item method"> <a href="#method_crossVZ">crossVZ</a> <span class="flag static">static</span> </li> <li class="index-item method"> <a href="#method_crossZV">crossZV</a> <span class="flag static">static</span> </li> <li class="index-item method"> <a href="#method_dist">dist</a> <span class="flag static">static</span> </li> <li class="index-item method"> <a href="#method_distance">distance</a> <span class="flag static">static</span> </li> <li class="index-item method"> <a href="#method_div">div</a> <span class="flag static">static</span> </li> <li class="index-item method"> <a href="#method_divide">divide</a> <span class="flag static">static</span> </li> <li class="index-item method"> <a href="#method_dot">dot</a> <span class="flag static">static</span> </li> <li class="index-item method"> <a href="#method_fromValues">fromValues</a> <span class="flag static">static</span> </li> <li class="index-item method"> <a href="#method_getLineSegmentsIntersection">getLineSegmentsIntersection</a> <span class="flag static">static</span> </li> <li class="index-item method"> <a href="#method_getLineSegmentsIntersectionFraction">getLineSegmentsIntersectionFraction</a> <span class="flag static">static</span> </li> <li class="index-item method"> <a href="#method_len">len</a> <span class="flag static">static</span> </li> <li class="index-item method"> <a href="#method_length">length</a> <span class="flag static">static</span> </li> <li class="index-item method"> <a href="#method_lerp">lerp</a> <span class="flag static">static</span> </li> <li class="index-item method"> <a href="#method_mul">mul</a> <span class="flag static">static</span> </li> <li class="index-item method"> <a href="#method_multiply">multiply</a> <span class="flag static">static</span> </li> <li class="index-item method"> <a href="#method_negate">negate</a> <span class="flag static">static</span> </li> <li class="index-item method"> <a href="#method_normalize">normalize</a> <span class="flag static">static</span> </li> <li class="index-item method"> <a href="#method_reflect">reflect</a> <span class="flag static">static</span> </li> <li class="index-item method"> <a href="#method_rotate">rotate</a> <span class="flag static">static</span> </li> <li class="index-item method"> <a href="#method_rotate90cw">rotate90cw</a> <span class="flag static">static</span> </li> <li class="index-item method"> <a href="#method_scale">scale</a> <span class="flag static">static</span> </li> <li class="index-item method"> <a href="#method_set">set</a> <span class="flag static">static</span> </li> <li class="index-item method"> <a href="#method_sqrDist">sqrDist</a> <span class="flag static">static</span> </li> <li class="index-item method"> <a href="#method_sqrLen">sqrLen</a> <span class="flag static">static</span> </li> <li class="index-item method"> <a href="#method_squaredDistance">squaredDistance</a> <span class="flag static">static</span> </li> <li class="index-item method"> <a href="#method_squaredLength">squaredLength</a> <span class="flag static">static</span> </li> <li class="index-item method"> <a href="#method_str">str</a> <span class="flag static">static</span> </li> <li class="index-item method"> <a href="#method_sub">sub</a> <span class="flag static">static</span> </li> <li class="index-item method"> <a href="#method_subtract">subtract</a> <span class="flag static">static</span> </li> <li class="index-item method"> <a href="#method_toGlobalFrame">toGlobalFrame</a> </li> <li class="index-item method"> <a href="#method_toGlobalFrame">toGlobalFrame</a> </li> <li class="index-item method"> <a href="#method_toLocalFrame">toLocalFrame</a> </li> <li class="index-item method"> <a href="#method_vectorToLocalFrame">vectorToLocalFrame</a> </li> </ul> </div> </div> <div id="methods" class="api-class-tabpanel"> <h2 class="off-left">Methods</h2> <div id="method_add" class="method item"> <h3 class="name"><code>add</code></h3> <div class="args"> <span class="paren">(</span><ul class="args-list inline commas"> <li class="arg"> <code>out</code> </li> <li class="arg"> <code>a</code> </li> <li class="arg"> <code>b</code> </li> </ul><span class="paren">)</span> </div> <span class="returns-inline"> <span class="type">Array</span> </span> <span class="flag static">static</span> <div class="meta"> <p> Defined in <a href="../files/src_math_vec2.js.html#l249"><code>src/math/vec2.js:249</code></a> </p> </div> <div class="description"> <p>Adds two vec2's</p> </div> <div class="params"> <h4>Parameters:</h4> <ul class="params-list"> <li class="param"> <code class="param-name">out</code> <span class="type">Array</span> <div class="param-description"> <p>the receiving vector</p> </div> </li> <li class="param"> <code class="param-name">a</code> <span class="type">Array</span> <div class="param-description"> <p>the first operand</p> </div> </li> <li class="param"> <code class="param-name">b</code> <span class="type">Array</span> <div class="param-description"> <p>the second operand</p> </div> </li> </ul> </div> <div class="returns"> <h4>Returns:</h4> <div class="returns-description"> <span class="type">Array</span>: <p>out</p> </div> </div> </div> <div id="method_centroid" class="method item"> <h3 class="name"><code>centroid</code></h3> <div class="args"> <span class="paren">(</span><ul class="args-list inline commas"> <li class="arg"> <code>out</code> </li> <li class="arg"> <code>a</code> </li> <li class="arg"> <code>b</code> </li> <li class="arg"> <code>c</code> </li> </ul><span class="paren">)</span> </div> <span class="returns-inline"> <span class="type">Array</span> </span> <span class="flag static">static</span> <div class="meta"> <p> Defined in <a href="../files/src_math_vec2.js.html#l161"><code>src/math/vec2.js:161</code></a> </p> </div> <div class="description"> <p>Compute centroid of a triangle spanned by vectors a,b,c. See <a href="http://easycalculation.com/analytical/learn-centroid.php">http://easycalculation.com/analytical/learn-centroid.php</a></p> </div> <div class="params"> <h4>Parameters:</h4> <ul class="params-list"> <li class="param"> <code class="param-name">out</code> <span class="type">Array</span> <div class="param-description"> </div> </li> <li class="param"> <code class="param-name">a</code> <span class="type">Array</span> <div class="param-description"> </div> </li> <li class="param"> <code class="param-name">b</code> <span class="type">Array</span> <div class="param-description"> </div> </li> <li class="param"> <code class="param-name">c</code> <span class="type">Array</span> <div class="param-description"> </div> </li> </ul> </div> <div class="returns"> <h4>Returns:</h4> <div class="returns-description"> <span class="type">Array</span>: <p>The out object</p> </div> </div> </div> <div id="method_clone" class="method item"> <h3 class="name"><code>clone</code></h3> <div class="args"> <span class="paren">(</span><ul class="args-list inline commas"> <li class="arg"> <code>a</code> </li> </ul><span class="paren">)</span> </div> <span class="returns-inline"> <span class="type">Array</span> </span> <span class="flag static">static</span> <div class="meta"> <p> Defined in <a href="../files/src_math_vec2.js.html#l191"><code>src/math/vec2.js:191</code></a> </p> </div> <div class="description"> <p>Creates a new vec2 initialized with values from an existing vector</p> </div> <div class="params"> <h4>Parameters:</h4> <ul class="params-list"> <li class="param"> <code class="param-name">a</code> <span class="type">Array</span> <div class="param-description"> <p>vector to clone</p> </div> </li> </ul> </div> <div class="returns"> <h4>Returns:</h4> <div class="returns-description"> <span class="type">Array</span>: <p>a new 2D vector</p> </div> </div> </div> <div id="method_copy" class="method item"> <h3 class="name"><code>copy</code></h3> <div class="args"> <span class="paren">(</span><ul class="args-list inline commas"> <li class="arg"> <code>out</code> </li> <li class="arg"> <code>a</code> </li> </ul><span class="paren">)</span> </div> <span class="returns-inline"> <span class="type">Array</span> </span> <span class="flag static">static</span> <div class="meta"> <p> Defined in <a href="../files/src_math_vec2.js.html#l220"><code>src/math/vec2.js:220</code></a> </p> </div> <div class="description"> <p>Copy the values from one vec2 to another</p> </div> <div class="params"> <h4>Parameters:</h4> <ul class="params-list"> <li class="param"> <code class="param-name">out</code> <span class="type">Array</span> <div class="param-description"> <p>the receiving vector</p> </div> </li> <li class="param"> <code class="param-name">a</code> <span class="type">Array</span> <div class="param-description"> <p>the source vector</p> </div> </li> </ul> </div> <div class="returns"> <h4>Returns:</h4> <div class="returns-description"> <span class="type">Array</span>: <p>out</p> </div> </div> </div> <div id="method_create" class="method item"> <h3 class="name"><code>create</code></h3> <span class="paren">()</span> <span class="returns-inline"> <span class="type">Array</span> </span> <span class="flag static">static</span> <div class="meta"> <p> Defined in <a href="../files/src_math_vec2.js.html#l178"><code>src/math/vec2.js:178</code></a> </p> </div> <div class="description"> <p>Creates a new, empty vec2</p> </div> <div class="returns"> <h4>Returns:</h4> <div class="returns-description"> <span class="type">Array</span>: <p>a new 2D vector</p> </div> </div> </div> <div id="method_crossLength" class="method item"> <h3 class="name"><code>crossLength</code></h3> <div class="args"> <span class="paren">(</span><ul class="args-list inline commas"> <li class="arg"> <code>a</code> </li> <li class="arg"> <code>b</code> </li> </ul><span class="paren">)</span> </div> <span class="returns-inline"> <span class="type">Number</span> </span> <span class="flag static">static</span> <div class="meta"> <p> Defined in <a href="../files/src_math_vec2.js.html#l32"><code>src/math/vec2.js:32</code></a> </p> </div> <div class="description"> <p>Make a cross product and only return the z component</p> </div> <div class="params"> <h4>Parameters:</h4> <ul class="params-list"> <li class="param"> <code class="param-name">a</code> <span class="type">Array</span> <div class="param-description"> </div> </li> <li class="param"> <code class="param-name">b</code> <span class="type">Array</span> <div class="param-description"> </div> </li> </ul> </div> <div class="returns"> <h4>Returns:</h4> <div class="returns-description"> <span class="type">Number</span>: </div> </div> </div> <div id="method_crossVZ" class="method item"> <h3 class="name"><code>crossVZ</code></h3> <div class="args"> <span class="paren">(</span><ul class="args-list inline commas"> <li class="arg"> <code>out</code> </li> <li class="arg"> <code>vec</code> </li> <li class="arg"> <code>zcomp</code> </li> </ul><span class="paren">)</span> </div> <span class="returns-inline"> <span class="type">Number</span> </span> <span class="flag static">static</span> <div class="meta"> <p> Defined in <a href="../files/src_math_vec2.js.html#l44"><code>src/math/vec2.js:44</code></a> </p> </div> <div class="description"> <p>Cross product between a vector and the Z component of a vector</p> </div> <div class="params"> <h4>Parameters:</h4> <ul class="params-list"> <li class="param"> <code class="param-name">out</code> <span class="type">Array</span> <div class="param-description"> </div> </li> <li class="param"> <code class="param-name">vec</code> <span class="type">Array</span> <div class="param-description"> </div> </li> <li class="param"> <code class="param-name">zcomp</code> <span class="type">Number</span> <div class="param-description"> </div> </li> </ul> </div> <div class="returns"> <h4>Returns:</h4> <div class="returns-description"> <span class="type">Number</span>: </div> </div> </div> <div id="method_crossZV" class="method item"> <h3 class="name"><code>crossZV</code></h3> <div class="args"> <span class="paren">(</span><ul class="args-list inline commas"> <li class="arg"> <code>out</code> </li> <li class="arg"> <code>zcomp</code> </li> <li class="arg"> <code>vec</code> </li> </ul><span class="paren">)</span> </div> <span class="returns-inline"> <span class="type">Number</span> </span> <span class="flag static">static</span> <div class="meta"> <p> Defined in <a href="../files/src_math_vec2.js.html#l59"><code>src/math/vec2.js:59</code></a> </p> </div> <div class="description"> <p>Cross product between a vector and the Z component of a vector</p> </div> <div class="params"> <h4>Parameters:</h4> <ul class="params-list"> <li class="param"> <code class="param-name">out</code> <span class="type">Array</span> <div class="param-description"> </div> </li> <li class="param"> <code class="param-name">zcomp</code> <span class="type">Number</span> <div class="param-description"> </div> </li> <li class="param"> <code class="param-name">vec</code> <span class="type">Array</span> <div class="param-description"> </div> </li> </ul> </div> <div class="returns"> <h4>Returns:</h4> <div class="returns-description"> <span class="type">Number</span>: </div> </div> </div> <div id="method_dist" class="method item"> <h3 class="name"><code>dist</code></h3> <span class="paren">()</span> <span class="flag static">static</span> <div class="meta"> <p> Defined in <a href="../files/src_math_vec2.js.html#l359"><code>src/math/vec2.js:359</code></a> </p> </div> <div class="description"> <p>Alias for vec2.distance</p> </div> </div> <div id="method_distance" class="method item"> <h3 class="name"><code>distance</code></h3> <div class="args"> <span class="paren">(</span><ul class="args-list inline commas"> <li class="arg"> <code>a</code> </li> <li class="arg"> <code>b</code> </li> </ul><span class="paren">)</span> </div> <span class="returns-inline"> <span class="type">Number</span> </span> <span class="flag static">static</span> <div class="meta"> <p> Defined in <a href="../files/src_math_vec2.js.html#l345"><code>src/math/vec2.js:345</code></a> </p> </div> <div class="description"> <p>Calculates the euclidian distance between two vec2's</p> </div> <div class="params"> <h4>Parameters:</h4> <ul class="params-list"> <li class="param"> <code class="param-name">a</code> <span class="type">Array</span> <div class="param-description"> <p>the first operand</p> </div> </li> <li class="param"> <code class="param-name">b</code> <span class="type">Array</span> <div class="param-description"> <p>the second operand</p> </div> </li> </ul> </div> <div class="returns"> <h4>Returns:</h4> <div class="returns-description"> <span class="type">Number</span>: <p>distance between a and b</p> </div> </div> </div> <div id="method_div" class="method item"> <h3 class="name"><code>div</code></h3> <span class="paren">()</span> <span class="flag static">static</span> <div class="meta"> <p> Defined in <a href="../files/src_math_vec2.js.html#l323"><code>src/math/vec2.js:323</code></a> </p> </div> <div class="description"> <p>Alias for vec2.divide</p> </div> </div> <div id="method_divide" class="method item"> <h3 class="name"><code>divide</code></h3> <div class="args"> <span class="paren">(</span><ul class="args-list inline commas"> <li class="arg"> <code>out</code> </li> <li class="arg"> <code>a</code> </li> <li class="arg"> <code>b</code> </li> </ul><span class="paren">)</span> </div> <span class="returns-inline"> <span class="type">Array</span> </span> <span class="flag static">static</span> <div class="meta"> <p> Defined in <a href="../files/src_math_vec2.js.html#l308"><code>src/math/vec2.js:308</code></a> </p> </div> <div class="description"> <p>Divides two vec2's</p> </div> <div class="params"> <h4>Parameters:</h4> <ul class="params-list"> <li class="param"> <code class="param-name">out</code> <span class="type">Array</span> <div class="param-description"> <p>the receiving vector</p> </div> </li> <li class="param"> <code class="param-name">a</code> <span class="type">Array</span> <div class="param-description"> <p>the first operand</p> </div> </li> <li class="param"> <code class="param-name">b</code> <span class="type">Array</span> <div class="param-description"> <p>the second operand</p> </div> </li> </ul> </div> <div class="returns"> <h4>Returns:</h4> <div class="returns-description"> <span class="type">Array</span>: <p>out</p> </div> </div> </div> <div id="method_dot" class="method item"> <h3 class="name"><code>dot</code></h3> <div class="args"> <span class="paren">(</span><ul class="args-list inline commas"> <li class="arg"> <code>a</code> </li> <li class="arg"> <code>b</code> </li> </ul><span class="paren">)</span> </div> <span class="returns-inline"> <span class="type">Number</span> </span> <span class="flag static">static</span> <div class="meta"> <p> Defined in <a href="../files/src_math_vec2.js.html#l462"><code>src/math/vec2.js:462</code></a> </p> </div> <div class="description"> <p>Calculates the dot product of two vec2's</p> </div> <div class="params"> <h4>Parameters:</h4> <ul class="params-list"> <li class="param"> <code class="param-name">a</code> <span class="type">Array</span> <div class="param-description"> <p>the first operand</p> </div> </li> <li class="param"> <code class="param-name">b</code> <span class="type">Array</span> <div class="param-description"> <p>the second operand</p> </div> </li> </ul> </div> <div class="returns"> <h4>Returns:</h4> <div class="returns-description"> <span class="type">Number</span>: <p>dot product of a and b</p> </div> </div> </div> <div id="method_fromValues" class="method item"> <h3 class="name"><code>fromValues</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> </ul><span class="paren">)</span> </div> <span class="returns-inline"> <span class="type">Array</span> </span> <span class="flag static">static</span> <div class="meta"> <p> Defined in <a href="../files/src_math_vec2.js.html#l205"><code>src/math/vec2.js:205</code></a> </p> </div> <div class="description"> <p>Creates a new vec2 initialized with the given values</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"> <p>X component</p> </div> </li> <li class="param"> <code class="param-name">y</code> <span class="type">Number</span> <div class="param-description"> <p>Y component</p> </div> </li> </ul> </div> <div class="returns"> <h4>Returns:</h4> <div class="returns-description"> <span class="type">Array</span>: <p>a new 2D vector</p> </div> </div> </div> <div id="method_getLineSegmentsIntersection" class="method item"> <h3 class="name"><code>getLineSegmentsIntersection</code></h3> <div class="args"> <span class="paren">(</span><ul class="args-list inline commas"> <li class="arg"> <code>out</code> </li> <li class="arg"> <code>p0</code> </li> <li class="arg"> <code>p1</code> </li> <li class="arg"> <code>p2</code> </li> <li class="arg"> <code>p3</code> </li> </ul><span class="paren">)</span> </div> <span class="returns-inline"> <span class="type">Boolean</span> </span> <span class="flag static">static</span> <div class="meta"> <p> Defined in <a href="../files/src_math_vec2.js.html#l516"><code>src/math/vec2.js:516</code></a> </p> </div> <div class="description"> <p>Get the intersection point between two line segments.</p> </div> <div class="params"> <h4>Parameters:</h4> <ul class="params-list"> <li class="param"> <code class="param-name">out</code> <span class="type">Array</span> <div class="param-description"> </div> </li> <li class="param"> <code class="param-name">p0</code> <span class="type">Array</span> <div class="param-description"> </div> </li> <li class="param"> <code class="param-name">p1</code> <span class="type">Array</span> <div class="param-description"> </div> </li> <li class="param"> <code class="param-name">p2</code> <span class="type">Array</span> <div class="param-description"> </div> </li> <li class="param"> <code class="param-name">p3</code> <span class="type">Array</span> <div class="param-description"> </div> </li> </ul> </div> <div class="returns"> <h4>Returns:</h4> <div class="returns-description"> <span class="type">Boolean</span>: <p>True if there was an intersection, otherwise false.</p> </div> </div> </div> <div id="method_getLineSegmentsIntersectionFraction" class="method item"> <h3 class="name"><code>getLineSegmentsIntersectionFraction</code></h3> <div class="args"> <span class="paren">(</span><ul class="args-list inline commas"> <li class="arg"> <code>p0</code> </li> <li class="arg"> <code>p1</code> </li> <li class="arg"> <code>p2</code> </li> <li class="arg"> <code>p3</code> </li> </ul><span class="paren">)</span> </div> <span class="returns-inline"> <span class="type">Number</span> </span> <span class="flag static">static</span> <div class="meta"> <p> Defined in <a href="../files/src_math_vec2.js.html#l538"><code>src/math/vec2.js:538</code></a> </p> </div> <div class="description"> <p>Get the intersection fraction between two line segments. If successful, the intersection is at p0 + t * (p1 - p0)</p> </div> <div class="params"> <h4>Parameters:</h4> <ul class="params-list"> <li class="param"> <code class="param-name">p0</code> <span class="type">Array</span> <div class="param-description"> </div> </li> <li class="param"> <code class="param-name">p1</code> <span class="type">Array</span> <div class="param-description"> </div> </li> <li class="param"> <code class="param-name">p2</code> <span class="type">Array</span> <div class="param-description"> </div> </li> <li class="param"> <code class="param-name">p3</code> <span class="type">Array</span> <div class="param-description"> </div> </li> </ul> </div> <div class="returns"> <h4>Returns:</h4> <div class="returns-description"> <span class="type">Number</span>: <p>A number between 0 and 1 if there was an intersection, otherwise -1.</p> </div> </div> </div> <div id="method_len" class="method item"> <h3 class="name"><code>len</code></h3> <span class="paren">()</span> <span class="flag static">static</span> <div class="meta"> <p> Defined in <a href="../files/src_math_vec2.js.html#l400"><code>src/math/vec2.js:400</code></a> </p> </div> <div class="description"> <p>Alias for vec2.length</p> </div> </div> <div id="method_length" class="method item"> <h3 class="name"><code>length</code></h3> <div class="args"> <span class="paren">(</span><ul class="args-list inline commas"> <li class="arg"> <code>a</code> </li> </ul><span class="paren">)</span> </div> <span class="returns-inline"> <span class="type">Number</span> </span> <span class="flag static">static</span> <div class="meta"> <p> Defined in <a href="../files/src_math_vec2.js.html#l387"><code>src/math/vec2.js:387</code></a> </p> </div> <div class="description"> <p>Calculates the length of a vec2</p> </div> <div class="params"> <h4>Parameters:</h4> <ul class="params-list"> <li class="param"> <code class="param-name">a</code> <span class="type">Array</span> <div class="param-description"> <p>vector to calculate length of</p> </div> </li> </ul> </div> <div class="returns"> <h4>Returns:</h4> <div class="returns-