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dom-game-2.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8" />
<title>DOM Game - Part 2</title>
<style>
body {
margin:0;
padding:0;
background:#888;
}
.playArea {
width:800px;
height:500px;
background:#000;
border:10px solid #333;
margin:30px auto 0;
box-shadow:5px 5px 10px #444;
position:relative;
overflow:hidden;
}
.ship {
width:50px;
height:50px;
background:blue;
position:absolute;
}
.laser {
width:4px;
height:20px;
background:red;
position:absolute;
}
</style>
</head>
<body>
<script>
(function () {
var playArea = document.createElement('div'),
ship = document.createElement('div'),
shipPos = {
x: 0,
y: 0
},
shipSpeed = 4,
key = {
right: false,
left: false,
up: false,
down: false
},
shipWidth = ship.offsetWidth,
shipHeight = ship.offsetHeight,
lasers = [],
laserSpeed = 4,
max_lasers = 5;
document.body.appendChild(playArea);
playArea.classList.add('playArea');
playArea.appendChild(ship);
ship.classList.add('ship');
shipPos.x = (playArea.offsetWidth / 2) - (ship.offsetWidth / 2);
shipPos.y = playArea.offsetHeight - (ship.offsetHeight * 2);
playArea.leftBoundary = 0;
playArea.rightBoundary = playArea.offsetWidth - ship.offsetWidth - 20;
playArea.topBoundary = 0;
playArea.bottomBoundary = playArea.offsetHeight - ship.offsetHeight - 20;
function moveShip() {
if (key.right === true) {
shipPos.x += shipSpeed;
} else if (key.left === true) {
shipPos.x -= shipSpeed;
}
if (key.up === true) {
shipPos.y -= shipSpeed;
} else if (key.down === true) {
shipPos.y += shipSpeed;
}
if (shipPos.x < playArea.leftBoundary) {
shipPos.x = playArea.leftBoundary;
}
if (shipPos.x > playArea.rightBoundary) {
shipPos.x = playArea.rightBoundary;
}
if (shipPos.y < playArea.topBoundary) {
shipPos.y = playArea.topBoundary;
}
if (shipPos.y > playArea.bottomBoundary) {
shipPos.y = playArea.bottomBoundary;
}
ship.style.left = shipPos.x + 'px';
ship.style.top = shipPos.y + 'px';
}
function Laser() {
return document.createElement('div');
}
function moveLasers() {
for (var i = 0; i < lasers.length; i++) {
lasers[i][1] -= laserSpeed;
lasers[i][0].style.top = lasers[i][1] + 'px';
if (parseInt(lasers[i][0].style.top) < playArea.topBoundary) {
playArea.removeChild(lasers[i][0]);
lasers.splice(i, 1);
}
}
}
function keyDown(e) {
if (e.keyCode === 39) {
key.right = true;
} else if (e.keyCode === 37) {
key.left = true;
}
if (e.keyCode === 38) {
key.up = true;
} else if (e.keyCode === 40) {
key.down = true;
}
if (e.keyCode === 88) {
if (lasers.length < max_lasers) {
var laser = Laser();
lasers.push([laser, shipPos.y]);
playArea.appendChild(lasers[lasers.length - 1][0]);
lasers[lasers.length - 1][0].classList.add('laser');
lasers[lasers.length - 1][0].style.top = lasers[lasers.length - 1][1] + 'px';
lasers[lasers.length - 1][0].style.left = shipPos.x + 25 + 'px';
}
}
}
function keyUp(e) {
if (e.keyCode === 39) {
key.right = false;
} else if (e.keyCode === 37) {
key.left = false;
}
if (e.keyCode === 38) {
key.up = false;
} else if (e.keyCode === 40) {
key.down = false;
}
}
document.addEventListener('keydown', keyDown, false);
document.addEventListener('keyup', keyUp, false);
function loop() {
moveShip();
moveLasers();
setTimeout(loop, 1000/60);
}
loop();
})();
</script>
</body>
</html>