140 lines
3.7 KiB
HTML
140 lines
3.7 KiB
HTML
<!DOCTYPE html>
|
|
<html>
|
|
<head>
|
|
<meta charset="utf-8">
|
|
<title></title>
|
|
<style type="text/css">
|
|
body {
|
|
background-color: black;
|
|
}
|
|
canvas {
|
|
display: block;
|
|
width: 640px;
|
|
height: 480px;
|
|
margin: 50px auto;
|
|
image-rendering: pixelated;
|
|
}
|
|
div { color: white; }
|
|
</style>
|
|
</head>
|
|
<body">
|
|
<div><span id="fps">0</span> <span id="look">0</span> <span id="altura">0</span></div>
|
|
<canvas id="canvas" width="320" height="240"></canvas>
|
|
|
|
<script type="text/javascript">
|
|
|
|
// variables generals
|
|
var delta = 0;
|
|
var lastRender = Date.now();
|
|
var canvas = document.getElementById("canvas");
|
|
var canvasWidth = canvas.width;
|
|
var canvasHeight = canvas.height;
|
|
var ctx = canvas.getContext('2d');
|
|
var imageData = ctx.getImageData(0, 0, canvasWidth, canvasHeight);
|
|
|
|
var buf = new ArrayBuffer(imageData.data.length);
|
|
var buf8 = new Uint8ClampedArray(buf);
|
|
var data = new Uint32Array(buf);
|
|
|
|
var leftPressed = false;
|
|
var upPressed = false;
|
|
var rightPressed = false;
|
|
var downPressed = false;
|
|
|
|
var width = 320; // logical canvas width
|
|
var height = 240; // logical canvas height
|
|
|
|
var nowTime = Date.now();
|
|
var lastTime = nowTime;
|
|
var dt = 0;
|
|
|
|
// capturem els events de teclat
|
|
document.addEventListener('keydown', function(event) {
|
|
if (event.keyCode == 37) { leftPressed = true; event.preventDefault(); }
|
|
else if (event.keyCode == 38) { upPressed = true; event.preventDefault(); }
|
|
else if (event.keyCode == 39) { rightPressed = true; event.preventDefault(); }
|
|
else if (event.keyCode == 40) { downPressed = true; event.preventDefault(); }
|
|
});
|
|
document.addEventListener('keyup', function(event) {
|
|
if (event.keyCode == 37) { leftPressed = false; event.preventDefault(); }
|
|
else if (event.keyCode == 38) { upPressed = false; event.preventDefault(); }
|
|
else if (event.keyCode == 39) { rightPressed = false; event.preventDefault(); }
|
|
else if (event.keyCode == 40) { downPressed = false; event.preventDefault(); }
|
|
});
|
|
|
|
// variables especifiques del joc
|
|
var dw = 0;
|
|
var w;
|
|
var cw;
|
|
var center;
|
|
var line;
|
|
var effect;
|
|
var carX = 0;
|
|
|
|
render();
|
|
|
|
// Bucle del joc
|
|
function render() {
|
|
|
|
// Pinta el fondo
|
|
for (var i = 0; i < 160*canvasWidth; ++i) { data[i] = 0xfffd8a00; }
|
|
|
|
// Pinta la carretera
|
|
cw = 0;
|
|
w = 240;
|
|
for (var y = 240; y >= 160; --y) {
|
|
line = 80 - 240 + y;
|
|
effect = line / 80;
|
|
center = 160 + (carX*effect);
|
|
dw += 0.01;
|
|
cw = dw + 240 / (y - 160);
|
|
w -= 2.88;
|
|
if (w > 0 ) {
|
|
var start = Math.floor(center-w);
|
|
var end = Math.floor(center+w);
|
|
for (var x = 0; x < 320; ++x) {
|
|
if ((x < start) || (x > end)) {
|
|
data[y * canvasWidth + x] = (cw % 8 > 4) ? 0xffcad8ee : 0xffc0cee0;
|
|
} else {
|
|
var coef = (x-start)/(w*2);
|
|
if ((coef < 0.05) ||
|
|
(coef > 0.95) ||
|
|
((coef > 0.33) && (coef < 0.35)) ||
|
|
((coef > 0.64) && (coef < 0.66))) {
|
|
data[y * canvasWidth + x] = (cw % 8 > 4) ? 0xffffffff : 0xff989898;
|
|
} else {
|
|
data[y * canvasWidth + x] = (cw % 8 > 4) ? 0xff909090 : 0xff989898;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
// Volcar el array de pixels al canvas
|
|
imageData.data.set(buf8);
|
|
ctx.putImageData(imageData, 0, 0);
|
|
requestAnimationFrame(render);
|
|
|
|
// updatar els fps
|
|
delta++;
|
|
if (Date.now() - lastRender >= 1000) {
|
|
lastRender = Date.now();
|
|
document.getElementById("fps").innerHTML = delta + " fps";
|
|
delta = 0;
|
|
}
|
|
|
|
// updatar el delta time
|
|
lastTime = nowTime;
|
|
nowTime = Date.now();
|
|
dt = nowTime - lastTime;
|
|
|
|
// si s'han pulsat tecles, fem coses
|
|
if (leftPressed) { carX += 10;}
|
|
if (rightPressed) { carX -= 10;}
|
|
|
|
if (upPressed) {}
|
|
if (downPressed) {}
|
|
}
|
|
</script>
|
|
</body>
|
|
</html> |