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bouncer.html
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<!doctype html>
<html>
<head>
<style type='text/css'>
canvas {
border: 1px solid #aaa;
cursor: none;
}
</style>
<script type="text/javascript" src="jquery-1.4.3.min.js"></script>
<script type="text/javascript">
var context;
var width = 500;
var height = 500;
var survival = 0;
var bestSurvival = 0;
var x = -50;
var y = -50;
function Understanding() {
this.l = new point(0,0);
this.mass = 1;
this.tick = function() {
drawCircle(this.l,"white",10);
resetIfOob(this);
}
}
function point(x,y) {
this.x = x;
this.y = y;
}
function distance(a,b) {
var xdist = Math.abs(a.x - b.x);
var ydist = Math.abs(a.y - b.y);
xdist = xdist * xdist;
ydist = ydist * ydist;
if (Math.abs(xdist + ydist) > 0) {
return Math.sqrt(xdist + ydist);
}
return 1000;
}
function Comet() {
this.l = new point(0,0);
this.vel =
this.mass = 1;
this.vel = new point(2,3);
this.tick = function() {
drawCircle(this.l,"white",6);
resetIfOob(this);
this.l = new point(x,y);
}
}
var c = new Comet();
function randomPoint() {
goalX = Math.random() * width;
goalY = Math.random() * height;
return new point(goalX, goalY);
}
function oob(a) {
if (a.l.x > width + 10 || a.l.x < -10 || a.l.y < -10 || a.l.y > height + 10) {
return true;
}
return false;
}
function resetIfOob(a) {
if (oob(a)) {
a.l = randomPoint();
a.vel = new point(0,0);
};
}
function drawCircle(p,colour,radius) {
context.fillStyle = colour;
context.beginPath();
context.arc(p.x,p.y,radius,0,Math.PI*2,true);
context.closePath();
context.fill();
}
function setBackground() {
context.clearRect(0, 0, width, height);
context.fillStyle = "black";
context.fillRect(0,0,width,height);
}
function combineVel(a, b) {
return new point (a.x+b.x,a.y+b.y);
}
function getAngle(a,b) {
var dist = distance(a,b);
if (dist == 0) {
return new point(0,0);
}
var distX = Math.abs(a.x-b.x) / dist;
var distY = Math.abs(a.y-b.y) / dist;
if (b.x < a.x) {
distX = -distX;
}
if (b.y < a.y) {
distY = -distY;
}
return new point(distX,distY);
}
function gravitize(a,b, multiplier) {
if (distance(a.l, b.l) > 3) {
var dx = a.l.x - b.l.x;
var dy = a.l.y - b.l.y;
var distx = Math.pow(dx,2);
var disty = Math.pow(dy,2);
if (distx + disty == 0) {
distx = .001;
disty = .001;
}
var dist = Math.sqrt(distx+disty);
if (dist == 0) {
dist = 1;
}
var forceY = Math.abs(dy) / Math.pow(dist,2) * a.mass;
var forceX = Math.abs(dx) / Math.pow(dist,2) * a.mass;
forceX = forceX * multiplier;
forceY = forceY * multiplier;
if (dy < 0) {
forceY = forceY * -1;
}
if (dx < 0) {
forceX = forceX * -1;
}
}
b.vel = combineVel(b.vel, new point(forceX,forceY));
}
function Star() {
this.l = randomPoint();
var rand = randomPoint();
var angle = getAngle(this.l,rand);
this.vel = new point (angle.x * 3, angle.y * 3);
this.highlighted = false;
this.tick = function() {
this.l = combineVel(this.l, this.vel);
drawCircle(this.l,"red",3);
if (oob(this)) {
var speed = Math.random() * 5;
speed = speed + 2;
var toC = getAngle(this.l, c.l);
this.vel = new point (toC.x * speed, toC.y * speed);
};
}
}
var stars = [];
function setupStars(starCount) {
for (var i = 0; i < starCount; i++) {
var s = new Star();
s.l = randomPoint();
stars.push(s);
};
}
function starLoop() {
for (var i = 0; i < stars.length; i++) {
var s = stars[i];
s.tick();
if (distance(s.l,c.l) < 10) {
if (survival > bestSurvival) {
bestSurvival = survival;
}
survival = 0;
}
}
}
function findClosestObjectToPoint(point, array) {
var dist = 10000;
var object = array[0];
for (var i = 0; i < array.length; i++) {
var objectDist = distance(array[i].l, point);
array[i].highlighted = false;
if (objectDist < dist) {
dist = objectDist;
object = array[i];
}
object.highlighted = true;
return object;
}
function cometLoop() {
c.tick();
}
function drawScore() {
survival++;
context.fillStyle = "white";
context.fillText(survival + " | " + bestSurvival,width / 2,height - 20);
}
function draw() {
setBackground();
var cursor = point(x,y);
starLoop();
cometLoop();
drawScore();
}
function setup() {
setupStars(50);
}
$(document).ready(function() {
var address = location.href;
console.log(location.href);
//send to server?
var canvas = $('#canvas');
context = canvas.get(0).getContext('2d');
setup();
setInterval(draw, 30);
canvas.mousemove(function(e) {
var mousex = e.pageX - canvas.offset().left;
var mousey = e.pageY - canvas.offset().top;
mousex -= width/2;
mousey -= width/2;
var angle = 0;
var mouse = new point(mousex, mousey);
x = mouse.x * Math.cos(angle) - mouse.y * Math.sin(angle) + width/2;
y = mouse.x * Math.sin(angle) + mouse.y * Math.cos(angle) + height/2;
});
});
</script>
</head>
<body>
<canvas id='canvas' width=500 height=500></canvas>
</body>
</html>