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<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>Easing 3D</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/ball3d.js"></script>
<script>
window.onload = function () {
var canvas = document.getElementById('canvas'),
context = canvas.getContext('2d'),
ball = new Ball3d(),
tx = Math.random() * 500 - 250,
ty = Math.random() * 500 - 250,
tz = Math.random() * 500,
easing = 0.1,
fl = 250,
vpX = canvas.width / 2,
vpY = canvas.height / 2;
(function drawFrame () {
window.requestAnimationFrame(drawFrame, canvas);
context.clearRect(0, 0, canvas.width, canvas.height);
var dx = tx - ball.xpos,
dy = ty - ball.ypos,
dz = tz - ball.zpos,
dist = Math.sqrt(dx * dx + dy * dy + dz * dz);
ball.xpos += dx * easing;
ball.ypos += dy * easing;
ball.zpos += dz * easing;
if (dist < 1) {
tx = Math.random() * 500 - 250;
ty = Math.random() * 500 - 250;
tz = Math.random() * 500;
}
if (ball.zpos > -fl) {
var scale = fl / (fl + ball.zpos);
ball.scaleX = ball.scaleY = scale;
ball.x = vpX + ball.xpos * scale;
ball.y = vpY + ball.ypos * scale;
ball.visible = true;
} else {
ball.visible = false;
}
if (ball.visible) {
ball.draw(context);
}
}());
};
</script>
</body>
</html>