Permalink
Switch branches/tags
Nothing to show
Find file Copy path
Fetching contributors…
Cannot retrieve contributors at this time
85 lines (76 sloc) 2.55 KB
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>Bubbles 1</title>
<link rel="stylesheet" href="../include/style.css">
</head>
<body>
<header>
Example from <a href="http://amzn.com/1430236655?tag=html5anim-20"><em>Foundation HTML5 Animation with JavaScript</em></a>
</header>
<canvas id="canvas" width="400" height="400"></canvas>
<script src="../include/utils.js"></script>
<script src="./classes/ball.js"></script>
<script>
window.onload = function () {
var canvas = document.getElementById('canvas'),
context = canvas.getContext('2d'),
centerBall = new Ball(100, "#cccccc"),
balls = [],
numBalls = 10,
spring = 0.03,
bounce = -1;
centerBall.x = canvas.width / 2;
centerBall.y = canvas.height / 2;
for (var ball, i = 0; i < numBalls; i++) {
ball = new Ball(Math.random() * 40 + 5, Math.random() * 0xffffff);
ball.x = Math.random() * canvas.width / 2;
ball.y = Math.random() * canvas.height / 2;
ball.vx = Math.random() * 6 - 3;
ball.vy = Math.random() * 6 - 3;
balls.push(ball);
}
function move (ball) {
ball.x += ball.vx;
ball.y += ball.vy;
if (ball.x + ball.radius > canvas.width) {
ball.x = canvas.width - ball.radius;
ball.vx *= bounce;
} else if (ball.x - ball.radius < 0) {
ball.x = ball.radius;
ball.vx *= bounce;
}
if (ball.y + ball.radius > canvas.height) {
ball.y = canvas.height - ball.radius;
ball.vy *= bounce;
} else if (ball.y - ball.radius < 0) {
ball.y = ball.radius;
ball.vy *= bounce;
}
}
function draw (ball) {
var dx = ball.x - centerBall.x,
dy = ball.y - centerBall.y,
dist = Math.sqrt(dx * dx + dy * dy),
min_dist = ball.radius + centerBall.radius;
if (dist < min_dist) {
var angle = Math.atan2(dy, dx),
tx = centerBall.x + Math.cos(angle) * min_dist,
ty = centerBall.y + Math.sin(angle) * min_dist;
ball.vx += (tx - ball.x) * spring;
ball.vy += (ty - ball.y) * spring;
}
ball.draw(context);
}
(function drawFrame () {
window.requestAnimationFrame(drawFrame, canvas);
context.clearRect(0, 0, canvas.width, canvas.height);
balls.forEach(move);
balls.forEach(draw);
centerBall.draw(context);
}());
};
</script>
</body>
</html>