code: function img_update() {
          if(!root.is('no_steps')) {
              new_canvas();
          }
          contextoList[quizJS.getCanvasIndex(root)].drawImage(canvas, 0, 0);
          context.clearRect(0, 0, canvas.width, canvas.height);
      }
docs: This function draws the #imageTemp canvas on top of #imageView, after which #imageTemp is cleared. This function is called each time when the user completes a drawing operation.