text: export default function (context, width, height, stepSize) {
      var grey = false;
      for (var x = 0; x < width; x += stepSize) {
          for (var y = 0; y < height; y += stepSize) {
              if (!(grey = !grey))
                  continue;
              context.fillRect(x, y, stepSize, stepSize);
          }
          grey = !grey;
      }
  };