
Fixed issue where alpha not being set correctly in canvas spriteBatch Fixed issue where previous stage events did not get removed correctly
279 lines
9.9 KiB
HTML
279 lines
9.9 KiB
HTML
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<h1 class="file-heading">File: src/pixi/core/Polygon.js</h1>
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<pre class="code prettyprint linenums">
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/**
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* @author Adrien Brault <adrien.brault@gmail.com>
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*/
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/**
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* @class Polygon
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* @constructor
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* @param points* {Array<Point>|Array<Number>|Point...|Number...} This can be an array of Points that form the polygon,
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* a flat array of numbers that will be interpreted as [x,y, x,y, ...], or the arguments passed can be
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* all the points of the polygon e.g. `new PIXI.Polygon(new PIXI.Point(), new PIXI.Point(), ...)`, or the
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* arguments passed can be flat x,y values e.g. `new PIXI.Polygon(x,y, x,y, x,y, ...)` where `x` and `y` are
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* Numbers.
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*/
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PIXI.Polygon = function(points)
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{
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//if points isn't an array, use arguments as the array
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if(!(points instanceof Array))
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points = Array.prototype.slice.call(arguments);
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//if this is a flat array of numbers, convert it to points
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if(typeof points[0] === 'number') {
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var p = [];
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for(var i = 0, il = points.length; i < il; i+=2) {
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p.push(
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new PIXI.Point(points[i], points[i + 1])
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);
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}
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points = p;
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}
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this.points = points;
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};
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/**
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* Creates a clone of this polygon
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*
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* @method clone
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* @return {Polygon} a copy of the polygon
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*/
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PIXI.Polygon.prototype.clone = function()
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{
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var points = [];
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for (var i=0; i<this.points.length; i++) {
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points.push(this.points[i].clone());
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}
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return new PIXI.Polygon(points);
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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 polygon
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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.Polygon.prototype.contains = function(x, y)
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{
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var inside = false;
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// use some raycasting to test hits
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// https://github.com/substack/point-in-polygon/blob/master/index.js
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for(var i = 0, j = this.points.length - 1; i < this.points.length; j = i++) {
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var xi = this.points[i].x, yi = this.points[i].y,
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xj = this.points[j].x, yj = this.points[j].y,
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intersect = ((yi > y) !== (yj > y)) && (x < (xj - xi) * (y - yi) / (yj - yi) + xi);
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if(intersect) inside = !inside;
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}
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return inside;
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};
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// constructor
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PIXI.Polygon.prototype.constructor = PIXI.Polygon;
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</pre>
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