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<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>Ship Sim 2</title>
<link rel="stylesheet" href="../include/style.css">
<style>
#canvas {
background-color: #000000;
}
</style>
</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>Press left and right arrow keys to rotate ship, up to add thrust.</aside>
<script src="../include/utils.js"></script>
<script src="./classes/ship.js"></script>
<script>
window.onload = function () {
var canvas = document.getElementById('canvas'),
context = canvas.getContext('2d'),
ship = new Ship(),
vr = 0,
vx = 0,
vy = 0,
thrust = 0;
ship.x = canvas.width / 2;
ship.y = canvas.height / 2;
window.addEventListener('keydown', function (event) {
switch (event.keyCode) {
case 37: //left
vr = -3;
break;
case 39: //right
vr = 3;
break;
case 38: //up
thrust = 0.05;
ship.showFlame = true;
break;
}
}, false);
window.addEventListener('keyup', function () {
vr = 0;
thrust = 0;
ship.showFlame = false;
}, false);
(function drawFrame () {
window.requestAnimationFrame(drawFrame, canvas);
context.clearRect(0, 0, canvas.width, canvas.height);
ship.rotation += vr * Math.PI / 180;
var angle = ship.rotation, //in radians
ax = Math.cos(angle) * thrust,
ay = Math.sin(angle) * thrust,
left = 0,
right = canvas.width,
top = 0,
bottom = canvas.height;
vx += ax;
vy += ay;
ship.x += vx;
ship.y += vy;
//screen wrapping
if (ship.x - ship.width / 2 > right) {
ship.x = left - ship.width / 2;
} else if (ship.x + ship.width / 2 < left) {
ship.x = right + ship.width / 2;
}
if (ship.y - ship.height / 2 > bottom) {
ship.y = top - ship.height / 2;
} else if (ship.y < top - ship.height / 2) {
ship.y = bottom + ship.height / 2;
}
ship.draw(context);
}());
};
</script>
</body>
</html>