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<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>Removal</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>
<textarea id="log"></textarea>
<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'),
log = document.getElementById('log'),
balls = [],
numBalls = 10;
for (var ball, i = 0; i < numBalls; i++) {
ball = new Ball(20);
ball.id = "ball" + i;
ball.x = Math.random() * canvas.width;
ball.y = Math.random() * canvas.height;
ball.vx = Math.random() * 2 - 1;
ball.vy = Math.random() * 2 - 1;
balls.push(ball);
}
function draw (ball, pos) {
ball.x += ball.vx;
ball.y += ball.vy;
if (ball.x - ball.radius > canvas.width ||
ball.x + ball.radius < 0 ||
ball.y - ball.radius > canvas.height ||
ball.y + ball.radius < 0) {
balls.splice(pos, 1); //remove ball from array
if (balls.length > 0) {
log.value = "Removed " + ball.id;
} else {
log.value = "All gone!";
}
}
ball.draw(context);
}
(function drawFrame () {
window.requestAnimationFrame(drawFrame, canvas);
context.clearRect(0, 0, canvas.width, canvas.height);
var i = balls.length;
while (i--) {
draw(balls[i], i);
}
}());
};
</script>
</body>
</html>