158 lines
4.4 KiB
HTML
158 lines
4.4 KiB
HTML
<!DOCTYPE html>
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<html>
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<head>
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<meta charset="utf-8">
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<title></title>
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<style type="text/css">
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body {
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background-color: black;
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}
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canvas {
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display: block;
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width: 640px;
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height: 480px;
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margin: 50px auto;
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image-rendering: pixelated;
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}
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div { color: white; }
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</style>
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</head>
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<body">
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<div><span id="fps">0</span> <span id="look">0</span> <span id="altura">0</span></div>
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<canvas id="canvas" width="320" height="240"></canvas>
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<script type="text/javascript">
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// variables generals
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var delta = 0;
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var lastRender = Date.now();
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var canvas = document.getElementById("canvas");
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var canvasWidth = canvas.width;
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var canvasHeight = canvas.height;
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var ctx = canvas.getContext('2d');
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var imageData = ctx.getImageData(0, 0, canvasWidth, canvasHeight);
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var buf = new ArrayBuffer(imageData.data.length);
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var buf8 = new Uint8ClampedArray(buf);
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var data = new Uint32Array(buf);
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var leftPressed = false;
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var upPressed = false;
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var rightPressed = false;
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var downPressed = false;
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var width = 320; // logical canvas width
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var height = 240; // logical canvas height
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var nowTime = Date.now();
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var lastTime = nowTime;
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var dt = 0;
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// capturem els events de teclat
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document.addEventListener('keydown', function(event) {
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if (event.keyCode == 37) { leftPressed = true; event.preventDefault(); }
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else if (event.keyCode == 38) { upPressed = true; event.preventDefault(); }
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else if (event.keyCode == 39) { rightPressed = true; event.preventDefault(); }
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else if (event.keyCode == 40) { downPressed = true; event.preventDefault(); }
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});
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document.addEventListener('keyup', function(event) {
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if (event.keyCode == 37) { leftPressed = false; event.preventDefault(); }
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else if (event.keyCode == 38) { upPressed = false; event.preventDefault(); }
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else if (event.keyCode == 39) { rightPressed = false; event.preventDefault(); }
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else if (event.keyCode == 40) { downPressed = false; event.preventDefault(); }
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});
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// variables especifiques del joc
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var dw = 0;
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var w;
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var cw;
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var center;
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var line;
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var effect;
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var carX = 0;
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var curve;
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var cc;
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var ccc;
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render();
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// Bucle del joc
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function render() {
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// Pinta el fondo
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for (var i = 0; i < 160*canvasWidth; ++i) { data[i] = 0xfffd8a00; }
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// Pinta la carretera
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cw = 0;
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w = 240;
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curve = 0;
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cc = 0;
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ccc = 0;
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//factor = 1.7;
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for (var y = 240; y >= 160; --y) {
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line = 80 - 240 + y;
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effect = line / 80;
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if (y < 210) ccc += 0.004;
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// fake'm unes curves cada 1000 unitats:
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if ((cw%1000) > 50 && (cw%1000) < 100) cc += ccc; // del punt 50 al 100, curva a la esquerra
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if ((cw%1000) > 200 && (cw%1000) < 250) cc -= ccc; // del 200 al 250, curva a la dreta
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if ((cw%1000) > 350 && (cw%1000) < 375) cc += ccc; // del 350 al 375 curva a la esquerra...
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if ((cw%1000) > 375 && (cw%1000) < 400) cc -= ccc; // ...seguida de curva a la dreta, fent 'ese'
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//if (y < 200) cc -= ccc;
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curve += cc;
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//if (y > 170) curve = (240 / (y-150 ))*4;
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center = 160 + (carX*effect) - curve;
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dw += 0.01;
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cw = dw + 240 / (y - 160);
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//factor *= 1.005;
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//factor *= 0.98;
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w -= 2.88;// * factor;
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if (w > 0 ) {
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var start = Math.floor(center-w);
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var end = Math.floor(center+w);
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for (var x = 0; x < 320; ++x) {
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if ((x < start) || (x > end)) {
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data[y * canvasWidth + x] = (cw % 8 > 4) ? 0xffcad8ee : 0xffc0cee0;
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} else {
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var coef = (x-start)/(w*2);
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if ((coef < 0.05) ||
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(coef > 0.95) ||
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((coef > 0.33) && (coef < 0.35)) ||
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((coef > 0.64) && (coef < 0.66))) {
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data[y * canvasWidth + x] = (cw % 8 > 4) ? 0xffffffff : 0xff989898;
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} else {
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data[y * canvasWidth + x] = (cw % 8 > 4) ? 0xff909090 : 0xff989898;
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}
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}
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}
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}
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}
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// Volcar el array de pixels al canvas
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imageData.data.set(buf8);
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ctx.putImageData(imageData, 0, 0);
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requestAnimationFrame(render);
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// updatar els fps
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delta++;
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if (Date.now() - lastRender >= 1000) {
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lastRender = Date.now();
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document.getElementById("fps").innerHTML = delta + " fps";
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delta = 0;
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}
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// updatar el delta time
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lastTime = nowTime;
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nowTime = Date.now();
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dt = nowTime - lastTime;
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// si s'han pulsat tecles, fem coses
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if (leftPressed) { carX += 10;}
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if (rightPressed) { carX -= 10;}
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if (upPressed) {}
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if (downPressed) {}
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}
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</script>
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</body>
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</html> |