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963 lines
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<a href="Phaser.Rope.html">Rope</a>
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<a href="Phaser.SpriteBatch.html">SpriteBatch</a>
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<a href="Phaser.TilemapLayer.html">TilemapLayer</a>
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<a href="Phaser.TilemapParser.html">TilemapParser</a>
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<a href="Phaser.Tileset.html">Tileset</a>
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<a href="Phaser.TileSprite.html">TileSprite</a>
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<a href="Phaser.Time.html">Time</a>
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<a href="Phaser.Touch.html">Touch</a>
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<a href="Phaser.TweenManager.html">TweenManager</a>
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<a href="Phaser.Utils.html">Utils</a>
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<a href="Phaser.Utils.Debug.html">Debug</a>
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<a href="Phaser.World.html">World</a>
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</ul>
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<h1 class="page-title">Source: math/QuadTree.js</h1>
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<section>
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<article>
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<pre class="sunlight-highlight-javascript linenums">/**
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* @author Timo Hausmann
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* @author Richard Davey <rich@photonstorm.com>
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* @copyright 2014 Photon Storm Ltd.
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* @license {@link https://github.com/photonstorm/phaser/blob/master/license.txt|MIT License}
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*/
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/**
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* A QuadTree implementation. The original code was a conversion of the Java code posted to GameDevTuts.
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* However I've tweaked it massively to add node indexing, removed lots of temp. var creation and significantly increased performance as a result.
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* Original version at https://github.com/timohausmann/quadtree-js/
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*
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* @class Phaser.QuadTree
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* @constructor
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* @param {number} x - The top left coordinate of the quadtree.
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* @param {number} y - The top left coordinate of the quadtree.
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* @param {number} width - The width of the quadtree in pixels.
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* @param {number} height - The height of the quadtree in pixels.
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* @param {number} [maxObjects=10] - The maximum number of objects per node.
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* @param {number} [maxLevels=4] - The maximum number of levels to iterate to.
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* @param {number} [level=0] - Which level is this?
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*/
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Phaser.QuadTree = function(x, y, width, height, maxObjects, maxLevels, level) {
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/**
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* @property {number} maxObjects - The maximum number of objects per node.
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* @default
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*/
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this.maxObjects = 10;
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/**
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* @property {number} maxLevels - The maximum number of levels to break down to.
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* @default
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*/
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this.maxLevels = 4;
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/**
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* @property {number} level - The current level.
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*/
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this.level = 0;
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/**
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* @property {object} bounds - Object that contains the quadtree bounds.
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*/
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this.bounds = {};
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/**
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* @property {array} objects - Array of quadtree children.
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*/
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this.objects = [];
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/**
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* @property {array} nodes - Array of associated child nodes.
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*/
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this.nodes = [];
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/**
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* @property {array} _empty - Internal empty array.
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* @private
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*/
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this._empty = [];
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this.reset(x, y, width, height, maxObjects, maxLevels, level);
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};
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Phaser.QuadTree.prototype = {
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/**
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* Resets the QuadTree.
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*
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* @method Phaser.QuadTree#reset
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* @param {number} x - The top left coordinate of the quadtree.
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* @param {number} y - The top left coordinate of the quadtree.
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* @param {number} width - The width of the quadtree in pixels.
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* @param {number} height - The height of the quadtree in pixels.
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* @param {number} [maxObjects=10] - The maximum number of objects per node.
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* @param {number} [maxLevels=4] - The maximum number of levels to iterate to.
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* @param {number} [level=0] - Which level is this?
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*/
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reset: function (x, y, width, height, maxObjects, maxLevels, level) {
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this.maxObjects = maxObjects || 10;
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this.maxLevels = maxLevels || 4;
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this.level = level || 0;
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this.bounds = {
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x: Math.round(x),
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y: Math.round(y),
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width: width,
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height: height,
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subWidth: Math.floor(width / 2),
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subHeight: Math.floor(height / 2),
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right: Math.round(x) + Math.floor(width / 2),
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bottom: Math.round(y) + Math.floor(height / 2)
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};
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this.objects.length = 0;
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this.nodes.length = 0;
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},
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/**
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* Populates this quadtree with the children of the given Group. In order to be added the child must exist and have a body property.
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*
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* @method Phaser.QuadTree#populate
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* @param {Phaser.Group} group - The Group to add to the quadtree.
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*/
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populate: function (group) {
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group.forEach(this.populateHandler, this, true);
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},
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/**
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* Handler for the populate method.
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*
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* @method Phaser.QuadTree#populateHandler
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* @param {Phaser.Sprite|object} sprite - The Sprite to check.
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*/
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populateHandler: function (sprite) {
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if (sprite.body && sprite.exists)
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{
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this.insert(sprite.body);
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}
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},
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/**
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* Split the node into 4 subnodes
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*
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* @method Phaser.QuadTree#split
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*/
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split: function () {
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// top right node
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this.nodes[0] = new Phaser.QuadTree(this.bounds.right, this.bounds.y, this.bounds.subWidth, this.bounds.subHeight, this.maxObjects, this.maxLevels, (this.level + 1));
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// top left node
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this.nodes[1] = new Phaser.QuadTree(this.bounds.x, this.bounds.y, this.bounds.subWidth, this.bounds.subHeight, this.maxObjects, this.maxLevels, (this.level + 1));
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// bottom left node
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this.nodes[2] = new Phaser.QuadTree(this.bounds.x, this.bounds.bottom, this.bounds.subWidth, this.bounds.subHeight, this.maxObjects, this.maxLevels, (this.level + 1));
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// bottom right node
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this.nodes[3] = new Phaser.QuadTree(this.bounds.right, this.bounds.bottom, this.bounds.subWidth, this.bounds.subHeight, this.maxObjects, this.maxLevels, (this.level + 1));
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},
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/**
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* Insert the object into the node. If the node exceeds the capacity, it will split and add all objects to their corresponding subnodes.
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*
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* @method Phaser.QuadTree#insert
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* @param {Phaser.Physics.Arcade.Body|object} body - The Body object to insert into the quadtree. Can be any object so long as it exposes x, y, right and bottom properties.
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*/
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insert: function (body) {
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var i = 0;
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var index;
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// if we have subnodes ...
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if (this.nodes[0] != null)
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{
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index = this.getIndex(body);
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if (index !== -1)
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{
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this.nodes[index].insert(body);
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return;
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}
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}
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this.objects.push(body);
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if (this.objects.length > this.maxObjects && this.level < this.maxLevels)
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{
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// Split if we don't already have subnodes
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if (this.nodes[0] == null)
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{
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this.split();
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}
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// Add objects to subnodes
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while (i < this.objects.length)
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{
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index = this.getIndex(this.objects[i]);
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if (index !== -1)
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{
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// this is expensive - see what we can do about it
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this.nodes[index].insert(this.objects.splice(i, 1)[0]);
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}
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else
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{
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i++;
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}
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}
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}
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},
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/**
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* Determine which node the object belongs to.
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*
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* @method Phaser.QuadTree#getIndex
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* @param {Phaser.Rectangle|object} rect - The bounds in which to check.
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* @return {number} index - Index of the subnode (0-3), or -1 if rect cannot completely fit within a subnode and is part of the parent node.
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*/
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getIndex: function (rect) {
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// default is that rect doesn't fit, i.e. it straddles the internal quadrants
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var index = -1;
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if (rect.x < this.bounds.right && rect.right < this.bounds.right)
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{
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if (rect.y < this.bounds.bottom && rect.bottom < this.bounds.bottom)
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{
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// rect fits within the top-left quadrant of this quadtree
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index = 1;
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}
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else if (rect.y > this.bounds.bottom)
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{
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// rect fits within the bottom-left quadrant of this quadtree
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index = 2;
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}
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}
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else if (rect.x > this.bounds.right)
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{
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// rect can completely fit within the right quadrants
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if (rect.y < this.bounds.bottom && rect.bottom < this.bounds.bottom)
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{
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// rect fits within the top-right quadrant of this quadtree
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index = 0;
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}
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else if (rect.y > this.bounds.bottom)
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{
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// rect fits within the bottom-right quadrant of this quadtree
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index = 3;
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}
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}
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return index;
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},
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/**
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* Return all objects that could collide with the given Sprite or Rectangle.
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*
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* @method Phaser.QuadTree#retrieve
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* @param {Phaser.Sprite|Phaser.Rectangle} source - The source object to check the QuadTree against. Either a Sprite or Rectangle.
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* @return {array} - Array with all detected objects.
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*/
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retrieve: function (source) {
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if (source instanceof Phaser.Rectangle)
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{
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var returnObjects = this.objects;
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var index = this.getIndex(source);
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}
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else
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{
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if (!source.body)
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{
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return this._empty;
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}
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var returnObjects = this.objects;
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var index = this.getIndex(source.body);
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}
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if (this.nodes[0])
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{
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// If rect fits into a subnode ..
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if (index !== -1)
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{
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returnObjects = returnObjects.concat(this.nodes[index].retrieve(source));
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}
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else
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{
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// If rect does not fit into a subnode, check it against all subnodes (unrolled for speed)
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returnObjects = returnObjects.concat(this.nodes[0].retrieve(source));
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returnObjects = returnObjects.concat(this.nodes[1].retrieve(source));
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returnObjects = returnObjects.concat(this.nodes[2].retrieve(source));
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returnObjects = returnObjects.concat(this.nodes[3].retrieve(source));
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}
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}
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return returnObjects;
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},
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/**
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* Clear the quadtree.
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* @method Phaser.QuadTree#clear
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*/
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clear: function () {
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this.objects.length = 0;
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var i = this.nodes.length;
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while (i--)
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{
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this.nodes[i].clear();
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this.nodes.splice(i, 1);
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}
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this.nodes.length = 0;
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}
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};
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Phaser.QuadTree.prototype.constructor = Phaser.QuadTree;
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/**
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* Javascript QuadTree
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* @version 1.0
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*
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* @version 1.3, March 11th 2014
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* @author Richard Davey
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* The original code was a conversion of the Java code posted to GameDevTuts. However I've tweaked
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* it massively to add node indexing, removed lots of temp. var creation and significantly
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* increased performance as a result.
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*
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* Original version at https://github.com/timohausmann/quadtree-js/
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*/
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/**
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* @copyright © 2012 Timo Hausmann
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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</pre>
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</article>
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<footer>
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Phaser Copyright © 2012-2014 Photon Storm Ltd.
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<br />
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Documentation generated by <a href="https://github.com/jsdoc3/jsdoc">JSDoc 3.3.0-dev</a>
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