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slinger.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 fury = new Fury();
fury.vel = new point(1,1);
var extras = [];
var x = -50;
var y = -50;
var cordX = 0;
var cordY = 0;
var start;
var hitDist = 20;
var life = new Life();
function point(x,y) {
this.x = x;
this.y = y;
}
life.vel = new point(1,1);
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 Life() {
this.l = new point(0,0);
this.mass = 8;
this.vel = new point(1,1);
this.tick = function() {
drawCircle(this.l,"green",10);
resetIfOob(this);
var dist = distance(this.l, fury.l);
dist = 300 - dist;
var newMass = dist / 30;
if (newMass < 8) {
newMass = 8;
} else if (newMass > 30) {
newMass = 30;
}
}
}
function Fury() {
this.l = new point(100,100);
this.vel = new point(3,2);
this.mass = 1;
this.tick = function() {
drawCircle(this.l,"red",10);
gravitize(this, life, 1);
this.l = combineVel(this.l, this.vel);
}
}
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 Monster() {
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 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 GetAngle(initialp, secondp) {
var distvar = ((initialp.x - secondp.x) * (initialp.x - secondp.x));
var distvar2 = ((initialp.y - secondp.y) * (initialp.y - secondp.y));
if (distvar + distvar2 == 0){
distvar = 1;
distvar2 = 3;
}
var veldistance = Math.sqrt((distvar+distvar2));
distvar = ((Math.abs(initialp.x-secondp.x))/veldistance);
distvar2 = ((Math.abs(initialp.y-secondp.y))/veldistance);
if (secondp.x < initialp.x){
console.log("reverse x");
distvar = -distvar;
}
console.log(secondp.x + "///" + initialp.x);
console.log(secondp.y + "///" + initialp.y);
if (secondp.y < initialp.y){
console.log("reverse y");
distvar2 = -distvar2;
}
var fvel = new point(distvar,distvar2);
return fvel;
}
function homeElastic() {
var ballToMouse = GetAngle(fury.l, life.l);
fury.l = combineVel(fury.l, ballToMouse);
}
function draw() {
setBackground();
var cursor = point(x,y);
life.tick();
fury.tick();
// gravitize(life,fury,1);
homeElastic();
}
function getTime() {
return new Date().getTime() / 1000;
}
function elapsedTime() {
return getTime() - start;
}
$(document).ready(function() {
start = getTime();
var canvas = $('#canvas');
context = canvas.get(0).getContext('2d');
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;
life.l = new point(x,y);
});
setInterval(draw, 10);
});
</script>
</head>
<body>
<canvas id='canvas' width=500 height=500></canvas>
</body>
</html>