59 lines
1.1 KiB
JavaScript
59 lines
1.1 KiB
JavaScript
var counter = 0;
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var PIXEL_SIZE = 4;
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var temp_1 = 0;
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function init()
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{
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setInterval('render()',50);
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}
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function dist(a, b, c, d)
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{
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return Math.sqrt((a - c) * (a - c) + (b - d) * (b - d));
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}
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function render()
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{
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var canvas = document.getElementById('tutorial');
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canvas.resize(128, 128);
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var ctx = canvas.getContext('2d');
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ctx.save();
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var time = counter * 5;
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for( y = 0; y < 128; y+=PIXEL_SIZE) {
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for( x = 0 ; x < 128; x+=PIXEL_SIZE) {
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var temp_val = Math.floor(Math.sin(dist(x + time, y, 128.0, 128.0) / 8.0)
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+ Math.sin(dist(x, y, 64.0, 64.0) / 8.0)
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+ Math.sin(dist(x, y + time / 7, 192.0, 64) / 7.0)
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+ Math.sin(dist(x, y, 192.0, 100.0) / 8.0));
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var temp_col = Math.floor((2 + temp_val) * 50);
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var rand_red = temp_col * 3;
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var rand_green = temp_col ;
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var rand_blue = 128 - temp_col;
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ctx.fillStyle = "rgb("+rand_red+","+rand_green+","+rand_blue+")";
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ctx.fillRect(x,y,PIXEL_SIZE,PIXEL_SIZE);
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}
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}
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ctx.restore();
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counter++;
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}
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init();
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