docs: function generateVLine(operand) {
                  var shape = new kity.Path(), // * 0.9 是为了在视觉上使斜线部分不至于太高
                  h = operand.getHeight() * .9, drawer = shape.getDrawer();
                  drawer.moveTo(tan15 * h, 0);
                  drawer.lineTo(0, h);
                  drawer.lineBy(sin15 * SHAPE_DATA_WIDTH * 3, cos15 * SHAPE_DATA_WIDTH * 3);
                  drawer.lineBy(tan15 * h + sin15 * SHAPE_DATA_WIDTH * 3, -(h + 3 * SHAPE_DATA_WIDTH * cos15));
                  drawer.close();
                  return shape.fill("black");
              }