266 lines
8.6 KiB
HTML
266 lines
8.6 KiB
HTML
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<h1 class="file-heading">File: src/pixi/core/Circle.js</h1>
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<div class="file">
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<pre class="code prettyprint linenums">
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/**
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* @author Chad Engler <chad@pantherdev.com>
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*/
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/**
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* The Circle object can be used to specify a hit area for displayobjects
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*
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* @class Circle
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* @constructor
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* @param x {Number} The X coord of the upper-left corner of the framing rectangle of this circle
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* @param y {Number} The Y coord of the upper-left corner of the framing rectangle of this circle
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* @param radius {Number} The radius of the circle
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*/
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PIXI.Circle = function(x, y, radius)
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{
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/**
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* @property x
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* @type Number
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* @default 0
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*/
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this.x = x || 0;
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/**
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* @property y
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* @type Number
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* @default 0
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*/
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this.y = y || 0;
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/**
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* @property radius
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* @type Number
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* @default 0
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*/
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this.radius = radius || 0;
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}
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/**
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* Creates a clone of this Circle instance
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*
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* @method clone
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* @return {Circle} a copy of the polygon
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*/
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PIXI.Circle.prototype.clone = function()
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{
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return new PIXI.Circle(this.x, this.y, this.radius);
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}
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/**
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* Checks if the x, and y coords passed to this function are contained within this circle
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*
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* @method contains
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* @param x {Number} The X coord of the point to test
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* @param y {Number} The Y coord of the point to test
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* @return {Boolean} if the x/y coords are within this polygon
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*/
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PIXI.Circle.prototype.contains = function(x, y)
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{
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if(this.radius <= 0)
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return false;
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var dx = (this.x - x),
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dy = (this.y - y),
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r2 = this.radius * this.radius;
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dx *= dx;
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dy *= dy;
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return (dx + dy <= r2);
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}
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// constructor
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PIXI.Circle.prototype.constructor = PIXI.Circle;
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</pre>
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