code: function parsePoints(points) {
      var coord = this._coord;
      var rst = [];
      Util.each(points, function (point) {
        rst.push(coord.convertPoint(point));
      });
      return rst;
    }
docs: 0～1 points 转 画布 points
  @param  {points} points 节点集合
  @return {points} points 转换后的多个节点