text: /**
   * @file 路径旋转
   * @author mengke01(kekee000@gmail.com)
   */
  
  
  
  
  /**
   * 对path坐标进行调整
   *
   * @param {Object} contour 坐标点
   * @param {number} angle 角度
   * @param {number} centerX x偏移
   * @param {number} centerY y偏移
   *
   * @return {Object} contour 坐标点
   */
  function pathRotate(contour, angle, centerX, centerY) {
      angle = angle === undefined ? 0 : angle;
      var x = centerX || 0;
      var y = centerY || 0;
      var cos = Math.cos(angle);
      var sin = Math.sin(angle);
      var px;
      var py;
      var p;
  
      // x1=cos(angle)*x-sin(angle)*y;
      // y1=cos(angle)*y+sin(angle)*x;
      for (var i = 0, l = contour.length; i < l; i++) {
          p = contour[i];
          px = cos * (p.x - x) - sin * (p.y - y);
          py = cos * (p.y - y) + sin * (p.x - x);
          p.x = px + x;
          p.y = py + y;
      }
  
      return contour;
  }
  
  module.exports = pathRotate;
      
  