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<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>Velocity 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>
<aside>Arrow keys move circle on x and y axis, shift/control key along the z-axis.</aside>
<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'),
ball = new Ball(),
xpos = 0,
ypos = 0,
zpos = 0,
vx = 0,
vy = 0,
vz = 0,
friction = 0.98,
fl = 250,
vpX = canvas.width / 2,
vpY = canvas.height / 2;
window.addEventListener('keydown', function (event) {
switch (event.keyCode) {
case 38: //up
vy -= 1;
break;
case 40: //down
vy += 1;
break;
case 37: //left
vx -= 1;
break;
case 39: //right
vx += 1;
break;
case 16: //shift
vz += 1;
break;
case 17: //control
vz -= 1;
break;
}
}, false);
(function drawFrame () {
window.requestAnimationFrame(drawFrame, canvas);
context.clearRect(0, 0, canvas.width, canvas.height);
xpos += vx;
ypos += vy;
zpos += vz;
vx *= friction;
vy *= friction;
vz *= friction;
if (zpos > -fl) {
var scale = fl / (fl + zpos);
ball.scaleX = ball.scaleY = scale;
ball.x = vpX + xpos * scale;
ball.y = vpY + ypos * scale;
ball.visible = true;
} else {
ball.visible = false;
}
if (ball.visible) {
ball.draw(context);
}
}());
};
</script>
</body>
</html>