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pong.html
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<!doctype html>
<html>
<head>
<title>JS1k, 1k demo submission [id]</title>
<meta charset="utf-8" />
</head>
<body>
<canvas id="c"></canvas>
<script type="text/javascript">
(function (document, getElementsByTagName, innerHTML, start) {
document.write('<br/><a href="#">'+start+'</a><p></p>');
var // constants
c = document[getElementsByTagName]('canvas')[0],
body = document[getElementsByTagName]('body')[0],
scoredisplay = document[getElementsByTagName]('p')[0],
button = document[getElementsByTagName]('a')[0],
width = 480,
height = 360,
paddleWidth = 60,
ballSize = 12,
paddleY = 349,
points = 'Points:',
// variables
paddleX,
ballX,
ballY,
ballDX,
ballDY,
pong = c.getContext("2d"),
running = 0,
score = 0,
pause = 1;
// functions
function draw() {
// paddle
pong.fillRect(paddleX,paddleY-6,paddleWidth,ballSize);
// ball
pong.beginPath();
pong.arc(ballX, ballY, ballSize, 0, 7, 1);
pong.fill();
}
function redraw() {
var cont = 1;
if(!pause) {
pong.clearRect(0, 0, width, height);
ballX += ballDX;
ballY += ballDY;
if(ballY < ballSize) {
ballDY *= -1;
ballY += ballDY;
}
if(ballX < ballSize || ballX >= width - ballSize) {
ballDX *= -1;
ballX += ballDX;
}
if(ballY > paddleY - 18 && ballY < height - 5 && ballX >= paddleX && ballX <= paddleX + paddleWidth) {
ballDY *= -1;
ballY += ballDY;
ballDX += (ballX - paddleX - 30) / 5;
scoredisplay[innerHTML] = points + ++score;
}
draw();
if(!(ballY > height - ballSize))
setTimeout(redraw, 33);
else {
scoredisplay[innerHTML] += '-GAME OVER';
pause = 1;
running = 0;
button[innerHTML] = start;
}
}
}
function init() {
paddleX = 210;
ballX = 234;
ballY = 17;
ballDX = 1.5;
ballDY = 8;
score = 0;
scoredisplay[innerHTML] = points + score;
}
function startGame() {
if(!running)
init();
running = 1;
if(pause) {
button[innerHTML] = 'Pause';
setTimeout(redraw, 33);
} else
button[innerHTML] = 'Continue';
pause=!pause;
}
c.width = width;
c.height = height;
c.style.border = 'solid #000';
button.onclick = startGame;
init();
draw();
document.onkeypress = document.onkeydown = document.onkeyup = function(e) {
if(!pause) {
if(e.keyCode==37 && paddleX > 0)
paddleX -= 7;
else if(e.keyCode==39 && paddleX + paddleWidth < width)
paddleX += 7;
}
};
})(document, 'getElementsByTagName', 'innerHTML', 'Start');
</script>
</body>
</html>