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draw.js
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258 lines (196 loc) · 4.72 KB
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/*
The MIT License
Copyright (c) 2011 Mike Chambers
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.
*/
var stage;
var circles;
var tree;
var CIRCLE_COUNT = 500;
var bounds;
var shape;
var fps;
function init()
{
if(!(!!document.createElement('canvas').getContext))
{
var d = document.getElementById("canvasContainer");
d.innerHTML = "This example requires a browser that supports the HTML5 Canvas element."
return;
}
circles = [];
var canvas = document.getElementById("canvas");
canvas.width = window.innerWidth;
canvas.height = window.innerHeight;
bounds = new Rectangle(0,0, canvas.width, canvas.height);
stage = new Stage(canvas);
shape = new Shape();
tree = new QuadTree(bounds, false, 7);
fps = new Text();
fps.x = 10;
fps.y = 15;
stage.addChild(fps);
var params = parseGetParams();
var circlesParam = params.circleCount;
if(circlesParam)
{
circleCount = parseInt(circlesParam);
if(circleCount)
{
CIRCLE_COUNT = circleCount;
}
}
initCircle2s();
stage.autoClear = false;
stage.update();
this.tick = tick_quad;
Ticker.setFPS(60);
//Ticker.setPaused(true);
Ticker.addListener(stage);
Ticker.addListener(window);
}
function initCircle2s()
{
var c;
var g;
var x, y;
//note, we are sharing the same graphics instance between all shape instances
//this saves CPU and memory, but could lead to some weird bugs, so keep that in mind
var radius;
for(var i = 0; i < CIRCLE_COUNT; i++)
{
radius = Math.ceil(Math.random() * 10) + 1;
c = new Circle2(bounds, radius);
x = Math.random() * bounds.width;
y = Math.random() * bounds.height;
if(x + c.width > bounds.width)
{
x = bounds.width - c.width - 1;
}
if(y + c.height > bounds.height)
{
y = bounds.height - c.height - 1;
}
c.x = x;
c.y = y;
stage.addChild(c);
circles.push(c);
tree.insert(c);
}
}
function updateTree()
{
//todo: call clear
//tree = new QuadTree(bounds);
//tree.insert(circles);
tree.clear();
tree.insert(circles);
}
function tick_quad()
{
//fps.text = "Balls : " + CIRCLE_COUNT + " / " + Math.round(Ticker.getMeasuredFPS()) + " fps";
for(var k = 0; k < CIRCLE_COUNT; k++)
{
circles[k].update();
}
updateTree();
var items;
var c;
var len;
var item;
var dx, dy, radii;
var colliding = false;
for(var i = 0; i < CIRCLE_COUNT; i++)
{
c = circles[i];
items = tree.retrieve(c);
len = items.length;
for(var j = 0; j < len; j++)
{
item = items[j];
if(c == item)
{
continue;
}
if(c.isColliding && item.isColliding)
{
continue;
}
dx = c.x - item.x;
dy = c.y - item.y;
radii = c.radius + item.radius;
colliding = (( dx * dx ) + ( dy * dy )) < (radii * radii);
if(!c.isColliding)
{
c.setIsColliding(colliding);
}
if(!item.isColliding)
{
item.setIsColliding(colliding);
}
}
}
stage.update();
}
function renderQuad()
{
var g = shape.graphics;
g.clear();
g.setStrokeStyle(1);
g.beginStroke("#000000");
drawNode(tree.root);
}
function drawNode(node)
{
var bounds = node._bounds;
var g = shape.graphics;
g.drawRect(
abs(bounds.x) + 0.5,
abs(bounds.y) + 0.5,
bounds.width,
bounds.height
);
var len = node.nodes.length;
for(var i = 0; i < len; i++)
{
drawNode(node.nodes[i]);
}
}
//fast Math.abs
function abs(x)
{
return (x < 0 ? -x : x);
}
function parseGetParams()
{
var getData = new Array();
var sGet = window.location.search;
if (sGet)
{
sGet = sGet.substr(1);
var sNVPairs = sGet.split("&");
for (var i = 0; i < sNVPairs.length; i++)
{
var sNV = sNVPairs[i].split("=");
var sName = sNV[0];
var sValue = sNV[1];
getData[sName] = sValue;
}
}
return getData;
}
window.onload = init;