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<h1 class="file-heading">File: src/pixi/geom/Polygon.js</h1>
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<pre class="code prettyprint linenums">
/**
* @author Adrien Brault <[email protected]>
*/
/**
* @class Polygon
* @constructor
* @param points* {Array<Point>|Array<Number>|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. `new PIXI.Polygon(new PIXI.Point(), new PIXI.Point(), ...)`, or the
* arguments passed can be flat x,y values e.g. `new PIXI.Polygon(x,y, x,y, x,y, ...)` where `x` and `y` are
* Numbers.
*/
PIXI.Polygon = function(points)
{
//if points isn'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(points[0] instanceof PIXI.Point)
{
var p = [];
for(var i = 0, il = points.length; i < il; i++)
{
p.push(points[i].x, points[i].y);
}
points = p;
}
this.closed = true;
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 = this.points.slice();
return new PIXI.Polygon(points);
};
/**
* Checks whether the x and y coordinates passed to this function are contained within this polygon
*
* @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 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
var length = this.points.length / 2;
for(var i = 0, j = length - 1; i < length; j = i++)
{
var xi = this.points[i * 2], yi = this.points[i * 2 + 1],
xj = this.points[j * 2], yj = this.points[j * 2 + 1],
intersect = ((yi > y) !== (yj > y)) && (x < (xj - xi) * (y - yi) / (yj - yi) + xi);
if(intersect) inside = !inside;
}
return inside;
};
// constructor
PIXI.Polygon.prototype.constructor = PIXI.Polygon;
</pre>
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