847eb6c48e
Fixed issue where alpha not being set correctly in canvas spriteBatch Fixed issue where previous stage events did not get removed correctly
276 lines
9.1 KiB
HTML
276 lines
9.1 KiB
HTML
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<h1 class="file-heading">File: src/pixi/core/Circle.js</h1>
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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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