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