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< h1 class = "page-title" > Source: math/QuadTree.js< / h1 >
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< article >
< pre class = "sunlight-highlight-javascript linenums" > /**
* @author Richard Davey < rich@photonstorm.com>
* @copyright 2013 Photon Storm Ltd.
* @license {@link https://github.com/photonstorm/phaser/blob/master/license.txt|MIT License}
*/
/**
* Javascript QuadTree
* @version 1.0
* @author Timo Hausmann
*
* @version 1.2, September 4th 2013
* @author Richard Davey
* The original code was a conversion of the Java code posted to GameDevTuts. However I've tweaked
* it massively to add node indexing, removed lots of temp. var creation and significantly
* increased performance as a result.
*
* Original version at https://github.com/timohausmann/quadtree-js/
*/
/**
* @copyright © 2012 Timo Hausmann
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
/**
* QuadTree Constructor
*
* @class Phaser.QuadTree
* @classdesc A QuadTree implementation. The original code was a conversion of the Java code posted to GameDevTuts. However I've tweaked
* it massively to add node indexing, removed lots of temp. var creation and significantly increased performance as a result. Original version at https://github.com/timohausmann/quadtree-js/
* @constructor
* @param {Description} physicsManager - Description.
* @param {Description} x - Description.
* @param {Description} y - Description.
* @param {number} width - The width of your game in game pixels.
* @param {number} height - The height of your game in game pixels.
* @param {number} maxObjects - Description.
* @param {number} maxLevels - Description.
* @param {number} level - Description.
*/
Phaser.QuadTree = function (physicsManager, x, y, width, height, maxObjects, maxLevels, level) {
this.physicsManager = physicsManager;
this.ID = physicsManager.quadTreeID;
physicsManager.quadTreeID++;
this.maxObjects = maxObjects || 10;
this.maxLevels = maxLevels || 4;
this.level = level || 0;
this.bounds = {
x: Math.round(x),
y: Math.round(y),
width: width,
height: height,
subWidth: Math.floor(width / 2),
subHeight: Math.floor(height / 2),
right: Math.round(x) + Math.floor(width / 2),
bottom: Math.round(y) + Math.floor(height / 2)
};
this.objects = [];
this.nodes = [];
};
Phaser.QuadTree.prototype = {
/*
* Split the node into 4 subnodes
*
* @method Phaser.QuadTree#split
*/
split: function() {
this.level++;
// top right node
this.nodes[0] = new Phaser.QuadTree(this.physicsManager, this.bounds.right, this.bounds.y, this.bounds.subWidth, this.bounds.subHeight, this.maxObjects, this.maxLevels, this.level);
// top left node
this.nodes[1] = new Phaser.QuadTree(this.physicsManager, this.bounds.x, this.bounds.y, this.bounds.subWidth, this.bounds.subHeight, this.maxObjects, this.maxLevels, this.level);
// bottom left node
this.nodes[2] = new Phaser.QuadTree(this.physicsManager, this.bounds.x, this.bounds.bottom, this.bounds.subWidth, this.bounds.subHeight, this.maxObjects, this.maxLevels, this.level);
// bottom right node
this.nodes[3] = new Phaser.QuadTree(this.physicsManager, this.bounds.right, this.bounds.bottom, this.bounds.subWidth, this.bounds.subHeight, this.maxObjects, this.maxLevels, this.level);
},
/*
* Insert the object into the node. If the node
* exceeds the capacity, it will split and add all
* objects to their corresponding subnodes.
*
* @method Phaser.QuadTree#insert
* @param {object} body - Description.
*/
insert: function (body) {
var i = 0;
var index;
// if we have subnodes ...
if (this.nodes[0] != null)
{
index = this.getIndex(body);
if (index !== -1)
{
this.nodes[index].insert(body);
return;
}
}
this.objects.push(body);
if (this.objects.length > this.maxObjects & & this.level < this.maxLevels)
{
// Split if we don't already have subnodes
if (this.nodes[0] == null)
{
this.split();
}
// Add objects to subnodes
while (i < this.objects.length)
{
index = this.getIndex(this.objects[i]);
if (index !== -1)
{
// this is expensive - see what we can do about it
this.nodes[index].insert(this.objects.splice(i, 1)[0]);
}
else
{
i++;
}
}
}
},
/*
* Determine which node the object belongs to.
*
* @method Phaser.QuadTree#getIndex
* @param {object} rect - Description.
* @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.
*/
getIndex: function (rect) {
// default is that rect doesn't fit, i.e. it straddles the internal quadrants
var index = -1;
if (rect.x < this.bounds.right & & rect.right < this.bounds.right)
{
if ((rect.y < this.bounds.bottom & & rect.bottom < this.bounds.bottom))
{
// rect fits within the top-left quadrant of this quadtree
index = 1;
}
else if ((rect.y > this.bounds.bottom))
{
// rect fits within the bottom-left quadrant of this quadtree
index = 2;
}
}
else if (rect.x > this.bounds.right)
{
// rect can completely fit within the right quadrants
if ((rect.y < this.bounds.bottom & & rect.bottom < this.bounds.bottom))
{
// rect fits within the top-right quadrant of this quadtree
index = 0;
}
else if ((rect.y > this.bounds.bottom))
{
// rect fits within the bottom-right quadrant of this quadtree
index = 3;
}
}
return index;
},
/*
* Return all objects that could collide with the given object.
*
* @method Phaser.QuadTree#retrieve
* @param {object} rect - Description.
* @Return {array} - Array with all detected objects.
*/
retrieve: function (sprite) {
var returnObjects = this.objects;
sprite.body.quadTreeIndex = this.getIndex(sprite.body);
// Temp store for the node IDs this sprite is in, we can use this for fast elimination later
sprite.body.quadTreeIDs.push(this.ID);
if (this.nodes[0])
{
// if rect fits into a subnode ..
if (sprite.body.quadTreeIndex !== -1)
{
returnObjects = returnObjects.concat(this.nodes[sprite.body.quadTreeIndex].retrieve(sprite));
}
else
{
// if rect does not fit into a subnode, check it against all subnodes (unrolled for speed)
returnObjects = returnObjects.concat(this.nodes[0].retrieve(sprite));
returnObjects = returnObjects.concat(this.nodes[1].retrieve(sprite));
returnObjects = returnObjects.concat(this.nodes[2].retrieve(sprite));
returnObjects = returnObjects.concat(this.nodes[3].retrieve(sprite));
}
}
return returnObjects;
},
/*
* Clear the quadtree.
* @method Phaser.QuadTree#clear
*/
clear: function () {
this.objects = [];
for (var i = 0, len = this.nodes.length; i < len; i++)
{
// if (typeof this.nodes[i] !== 'undefined')
if (this.nodes[i])
{
this.nodes[i].clear();
delete this.nodes[i];
}
}
}
};
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