code: function (color, point) {
              var ctx = this._canvas.getContext('2d');
  
              ctx.beginPath();
              ctx.fillStyle = color;
              ctx.strokeStyle = color;
              ctx.lineWidth = 0.5;
  
              ctx.arc(point.x, point.y, 5, 0, 2 * Math.PI, false);
              ctx.fill();
  
              ctx.beginPath();
              ctx.moveTo(point.x - 50, point.y);
              ctx.lineTo(point.x + 50, point.y);
              ctx.stroke();
  
              ctx.beginPath();
              ctx.moveTo(point.x, point.y - 50);
              ctx.lineTo(point.x, point.y + 50);
              ctx.stroke();
          }
docs: Helper function for drawing a cross mark
  @param color
  @param point