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Ingy döt Net 2023-07-01 11:58:00 -04:00
parent 7387c8f97b
commit cb5bb5e222
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Task/Image-noise/JavaScript/image-noise.js Normal file
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<body>
<canvas id='c'></canvas>
<script>
var canvas = document.getElementById('c');
var ctx = canvas.getContext('2d');
var w = canvas.width = 320;
var h = canvas.height = 240;
var t1 = new Date().getTime();
var frame_count = 0;
ctx.font = 'normal 400 24px/2 Unknown Font, sans-serif';
var img = ctx.createImageData(w, h);
var index_init = 0;
for (var x = 0; x < w; x++) {
for (var y = 0; y < h; y++) {
img.data[index_init + 3] = 255; // alpha
index_init += 4;
}
}
function animate() {
var index = 0;
for (var x = 0; x < w; x++) {
for (var y = 0; y < h; y++) {
var value = (Math.random() > 0.5) ? 255 : 0;
img.data[index ] = value;
img.data[index + 1] = value;
img.data[index + 2] = value;
// alpha channel is constant
index += 4;
}
}
ctx.putImageData(img, 0, 0);
frame_count++;
if (frame_count % 50 == 0) {
var fps = frame_count / (new Date().getTime() - t1) * 1000;
window.status = fps.toFixed(2) + " fps";
}
setTimeout(animate, 0);
}
animate();
</script>
</body>