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<h1 class="file-heading">File: src/pixi/geom/Circle.js</h1>
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<pre class="code prettyprint linenums">
/**
* @author Chad Engler <[email protected]>
*/
/**
* The Circle object can be used to specify a hit area for displayObjects
*
* @class Circle
* @constructor
* @param x {Number} The X coordinate of the center of this circle
* @param y {Number} The Y coordinate of the center of this circle
* @param radius {Number} The radius of the circle
*/
PIXI.Circle = function(x, y, radius)
{
/**
* @property x
* @type Number
* @default 0
*/
this.x = x || 0;
/**
* @property y
* @type Number
* @default 0
*/
this.y = y || 0;
/**
* @property radius
* @type Number
* @default 0
*/
this.radius = radius || 0;
};
/**
* Creates a clone of this Circle instance
*
* @method clone
* @return {Circle} a copy of the Circle
*/
PIXI.Circle.prototype.clone = function()
{
return new PIXI.Circle(this.x, this.y, this.radius);
};
/**
* Checks whether the x and y coordinates given are contained within this circle
*
* @method contains
* @param x {Number} The X coordinate of the point to test
* @param y {Number} The Y coordinate of the point to test
* @return {Boolean} Whether the x/y coordinates are within this Circle
*/
PIXI.Circle.prototype.contains = function(x, y)
{
if(this.radius <= 0)
return false;
var dx = (this.x - x),
dy = (this.y - y),
r2 = this.radius * this.radius;
dx *= dx;
dy *= dy;
return (dx + dy <= r2);
};
/**
* Returns the framing rectangle of the circle as a PIXI.Rectangle object
*
* @method getBounds
* @return {Rectangle} the framing rectangle
*/
PIXI.Circle.prototype.getBounds = function()
{
return new PIXI.Rectangle(this.x - this.radius, this.y - this.radius, this.radius * 2, this.radius * 2);
};
// constructor
PIXI.Circle.prototype.constructor = PIXI.Circle;
</pre>
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