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kinetictension.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 coordinatesCollected = 0;
var cords = [];
var cord = new Target();
cord.vel = new point(-2,-2);
var extras = [];
var x = -50;
var y = -50;
var cordX = 0;
var cordY = 0;
var start;
var hitDist = 20;
var understanding = new Understanding();
function point(x,y) {
this.x = x;
this.y = y;
}
function randomPoint() {
goalY = Math.random() * width/2 + width/4;
goalY = Math.random() * height/2 + height/4;
return new point(goalY, goalY);
}
function resetIfOob(a) {
if (a.l.x > width + 10 || a.l.x < -10 || a.l.y < -10 || a.l.y > height + 10) {
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 Understanding() {
this.l = new point(0,0);
this.mass = 1;
this.tick = function() {
drawCircle(this.l,"white",10);
resetIfOob(this);
}
}
function Target() {
this.l = new point(0,0);
this.vel = new point(0,0);
this.mass = 8;
this.tick = function() {
drawCircle(this.l,"green",10);
this.l = combineVel(this.l, this.vel);
resetIfOob(this);
}
}
function Extras() {
this.l = new point(0,0);
this.vel = new point(Math.random() * 3, Math.random() * 3);
this.mass = 3;
this.tick = function() {
drawCircle(this.l,"orange",10);
this.l = combineVel(this.l, this.vel);
resetIfOob(this);
}
}
function generateExtras(num) {
for (var i = 0; i < num; i++) {
extras.push(new Extras());
extras[i].l = randomPoint();
}
}
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 distance(a,b) {
var xdist = (a.x + b.x) * (a.x + b.x);
var ydist = (a.y + b.y) * (a.y + b.y);
return Math.sqrt(xdist * ydist);
}
function gravitize(a,b, multiplier) {
if (distance(a.l, b.l) > 2) {
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 useGravity() {
for (var i = 0; i < extras.length; i++) {
extras[i].tick();
gravitize(extras[i], cord, 1);
gravitize(cord, extras[i], 1);
gravitize(understanding, cord, -1);
for (var ii = 0; ii < extras.length; ii++) {
if (i != ii) {
gravitize(extras[i], extras[ii], 1);
}
}
};
}
function drawScore() {
context.fillStyle = "white";
context.fillText("Coordinates collected: " + coordinatesCollected, 0,height - 20);
}
function resetExtras() {
for (var i = 0; i < extras.length; i++) {
var extra = extras[i];
extra.l = randomPoint();
}
}
function cordTouched(cord) {
coordinatesCollected = coordinatesCollected + 1;
cords.push(new point(cord.l.x, cord.l.y));
moveCord();
}
function collisionCheck() {
// for (var i = 0; i < extras.length; i++) {
// var extra = extras[i];
// if (Math.abs(x - extra.l.x) < hitDist && Math.abs(y - extra.l.y) < hitDist) {
// // moveCord();
// }
// }
}
function drawCords() {
for (var i = 0; i < cords.length; i++) {
var coord = cords[i];
drawCircle(coord,"red",10); }
}
function draw() {
setBackground();
var cursor = point(x,y);
understanding.tick();
cord.tick();
drawScore();
useGravity();
collisionCheck();
if (Math.abs(x - cord.l.x) < hitDist && Math.abs(y - cord.l.y) < hitDist) {
cordTouched(cord);
}
drawCords();
}
function moveCord() {
cordY = Math.random() * width/2 + width/4;
cordY = Math.random() * height/2 + height/4;
cord.l = new point(cordY,cordY);
cord.vel = new point(0,0);
}
function getTime() {
return new Date().getTime() / 1000;
}
function elapsedTime() {
return getTime() - start;
}
$(document).ready(function() {
start = getTime();
moveCord();
var canvas = $('#canvas');
context = canvas.get(0).getContext('2d');
generateExtras(2);
canvas.click(function(e) {
var mousex = e.pageX - canvas.offset().left;
var mousey = e.pageY - canvas.offset().top;
console.log(mousex + " " + mousey);
});
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;
understanding.l = new point(x,y);
});
setInterval(draw, 10);
});
</script>
</head>
<body>
<canvas id='canvas' width=500 height=500></canvas>
</body>
</html>