code: function rotatePaths(paths, angle) {
              if (!angle) {
                  return paths;
              }
  
              var bound = computeBoundingBox.computePath.apply(null, paths);
  
              var cx = bound.x + (bound.width) / 2;
              var cy = bound.y + (bound.height) / 2;
  
              paths.forEach(function (p) {
                  pathRotate(p, angle, cx, cy);
              });
  
              return paths;
          }
docs: 旋转路径
  
  @param {Array} paths 路径数组
  @param {number} angle 弧度
  @return {Array} 变换后的路径