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href="Phaser.Tween.html">Tween</a> </li> <li class="class-depth-1"> <a href="Phaser.TweenManager.html">TweenManager</a> </li> <li class="class-depth-1"> <a href="Phaser.Utils.html">Utils</a> </li> <li class="class-depth-2"> <a href="Phaser.Utils.Debug.html">Debug</a> </li> <li class="class-depth-1"> <a href="Phaser.World.html">World</a> </li> </ul> </li> </ul> </div> </div> <div class="row-fluid"> <div class="span12"> <div id="main"> <h1 class="page-title">Source: geom/Polygon.js</h1> <section> <article> <pre class="sunlight-highlight-javascript linenums">/** * @author Richard Davey <rich@photonstorm.com> * @author Adrien Brault <adrien.brault@gmail.com> * @copyright 2014 Photon Storm Ltd. * @license {@link https://github.com/photonstorm/phaser/blob/master/license.txt|MIT License} */ /** * Creates a new Polygon. You have to provide a list of points. * 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 Phaser.Polygon(new Phaser.Point(), new Phaser.Point(), ...)`, or the * arguments passed can be flat x,y values e.g. `new Phaser.Polygon(x,y, x,y, x,y, ...)` where `x` and `y` are numbers. * * @class Phaser.Polygon * @classdesc The polygon represents a list of orderded points in space * @constructor * @param {Array<Phaser.Point>|Array<number>} points - The array of Points. */ Phaser.Polygon = function (points) { /** * @property {number} type - The base object type. */ this.type = Phaser.POLYGON; //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 (typeof points[0] === 'number') { var p = []; for (var i = 0, len = points.length; i < len; i += 2) { p.push(new Phaser.Point(points[i], points[i + 1])); } points = p; } /** * @property {array<Phaser.Point>|array<number>} points - The array of vertex Points. * @private */ this._points = points; }; Phaser.Polygon.prototype = { /** * Creates a clone of this polygon. * * @method Phaser.Polygon#clone * @return {Phaser.Polygon} A copy of the polygon. */ clone: function () { var points = []; for (var i=0; i < this.points.length; i++) { points.push(this.points[i].clone()); } return new Phaser.Polygon(points); }, /** * Checks whether the x and y coordinates are contained within this polygon. * * @method Phaser.Polygon#contains * @param {number} x - The X value of the coordinate to test. * @param {number} y - The Y value of the coordinate to test. * @return {boolean} True if the coordinates are within this polygon, otherwise false. */ contains: function (x, y) { var inside = false; // use some raycasting to test hits https://github.com/substack/point-in-polygon/blob/master/index.js for (var i = 0, j = this.points.length - 1; i < this.points.length; j = i++) { var xi = this.points[i].x; var yi = this.points[i].y; var xj = this.points[j].x; var yj = this.points[j].y; var intersect = ((yi > y) !== (yj > y)) && (x < (xj - xi) * (y - yi) / (yj - yi) + xi); if (intersect) { inside = !inside; } } return inside; } }; Phaser.Polygon.prototype.constructor = Phaser.Polygon; /* * Sets and modifies the points of this polygon. * * @name Phaser.Polygon#points * @property {array<Phaser.Point>|array<number>} points - The array of vertex points */ Object.defineProperty(Phaser.Polygon.prototype, 'points', { get: function() { return this._points; }, set: 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 (typeof points[0] === 'number') { var p = []; for (var i = 0, len = points.length; i < len; i += 2) { p.push(new Phaser.Point(points[i], points[i + 1])); } points = p; } this._points = points; } }); /** * Returns the area of the polygon. * * @name Phaser.Circle#right * @readonly */ Object.defineProperty(Phaser.Polygon.prototype, 'area', { get: function() { var p1; var p2; var avgHeight; var width; var i; var y0 = Number.MAX_VALUE; var area = 0; // Find lowest boundary for (i = 0; i < this.points.length; i++) { if (this.points[i].y < y0) { y0 = this.points[i].y; } } for (i = 0; i< this.points.length; i++) { p1 = this.points[i]; if (i === this.points.length - 1) { p2 = this.points[0]; } else { p2 = this.points[i+1]; } avgHeight = ((p1.y - y0) + (p2.y - y0)) / 2; width = p1.x - p2.x; area += avgHeight * width; } return area; } }); // Because PIXI uses its own Polygon, we'll replace it with ours to avoid duplicating code or confusion. PIXI.Polygon = Phaser.Polygon; </pre> </article> </section> </div> <div class="clearfix"></div> <footer> <span class="copyright"> Phaser Copyright © 2012-2014 Photon Storm Ltd. </span> <br /> <span class="jsdoc-message"> Documentation generated by <a href="https://github.com/jsdoc3/jsdoc">JSDoc 3.3.0-dev</a> on Tue May 20 2014 10:05:49 GMT+0100 (BST) using the <a href="https://github.com/terryweiss/docstrap">DocStrap template</a>. </span> </footer> </div> <br clear="both"> </div> </div> <script src="scripts/sunlight.js"></script> <script src="scripts/sunlight.javascript.js"></script> <script src="scripts/sunlight-plugin.doclinks.js"></script> <script src="scripts/sunlight-plugin.linenumbers.js"></script> <script src="scripts/sunlight-plugin.menu.js"></script> <script src="scripts/jquery.min.js"></script> <script src="scripts/jquery.scrollTo.js"></script> <script src="scripts/jquery.localScroll.js"></script> <script src="scripts/bootstrap-dropdown.js"></script> <script src="scripts/toc.js"></script> <script> Sunlight.highlightAll({lineNumbers:true, showMenu: true, enableDoclinks :true}); </script> <script> $( function () { $( "#toc" ).toc( { anchorName : function(i, heading, prefix) { return $(heading).attr("id") || ( prefix + i ); }, selectors : "h1,h2,h3,h4", showAndHide : false, scrollTo : 60 } ); $( "#toc>ul" ).addClass( "nav nav-pills nav-stacked" ); $( "#main span[id^='toc']" ).addClass( "toc-shim" ); } ); </script> </body> </html>