plasma.js Example File | Qt Script

Qt 5.9 | Qt Script | Context2D Example | plasma.js Example File

Qt 5.9.2 Reference Documentation

# plasma.js Example File

script/context2d/scripts/plasma.js

      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();