plasma.js Example File

  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();