pixi.js/docs/files/src_pixi_core_Polygon.js.html
Mat Groves 847eb6c48e Docs updated
Fixed issue where alpha not being set correctly in canvas spriteBatch
Fixed issue where previous stage events did not get removed correctly
2014-01-28 00:08:50 +00:00

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<h1 class="file-heading">File: src/pixi/core/Polygon.js</h1>
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<pre class="code prettyprint linenums">
/**
* @author Adrien Brault &lt;adrien.brault@gmail.com&gt;
*/
/**
* @class Polygon
* @constructor
* @param points* {Array&lt;Point&gt;|Array&lt;Number&gt;|Point...|Number...} This can be an array of Points that form the polygon,
* a flat array of numbers that will be interpreted as [x,y, x,y, ...], or the arguments passed can be
* all the points of the polygon e.g. &#x60;new PIXI.Polygon(new PIXI.Point(), new PIXI.Point(), ...)&#x60;, or the
* arguments passed can be flat x,y values e.g. &#x60;new PIXI.Polygon(x,y, x,y, x,y, ...)&#x60; where &#x60;x&#x60; and &#x60;y&#x60; are
* Numbers.
*/
PIXI.Polygon = function(points)
{
//if points isn&#x27;t an array, use arguments as the array
if(!(points instanceof Array))
points = Array.prototype.slice.call(arguments);
//if this is a flat array of numbers, convert it to points
if(typeof points[0] === &#x27;number&#x27;) {
var p = [];
for(var i = 0, il = points.length; i &lt; il; i+=2) {
p.push(
new PIXI.Point(points[i], points[i + 1])
);
}
points = p;
}
this.points = points;
};
/**
* Creates a clone of this polygon
*
* @method clone
* @return {Polygon} a copy of the polygon
*/
PIXI.Polygon.prototype.clone = function()
{
var points = [];
for (var i=0; i&lt;this.points.length; i++) {
points.push(this.points[i].clone());
}
return new PIXI.Polygon(points);
};
/**
* Checks if the x and y coords passed to this function are contained within this polygon
*
* @method contains
* @param x {Number} The X coord of the point to test
* @param y {Number} The Y coord of the point to test
* @return {Boolean} if the x/y coords are within this polygon
*/
PIXI.Polygon.prototype.contains = function(x, y)
{
var inside = false;
// use some raycasting to test hits
// https://github.com/substack/point-in-polygon/blob/master/index.js
for(var i = 0, j = this.points.length - 1; i &lt; this.points.length; j = i++) {
var xi = this.points[i].x, yi = this.points[i].y,
xj = this.points[j].x, yj = this.points[j].y,
intersect = ((yi &gt; y) !== (yj &gt; y)) &amp;&amp; (x &lt; (xj - xi) * (y - yi) / (yj - yi) + xi);
if(intersect) inside = !inside;
}
return inside;
};
// constructor
PIXI.Polygon.prototype.constructor = PIXI.Polygon;
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