var Path = require("../Path");

var dataUtil = require("../../core/utils/data_structure_util");

var _constants = require("../../graphic/constants");

var mathSin = _constants.mathSin;
var mathCos = _constants.mathCos;
var PI2 = _constants.PI2;
var PI = _constants.PI;

function _typeof(obj) { "@babel/helpers - typeof"; if (typeof Symbol === "function" && typeof Symbol.iterator === "symbol") { _typeof = function _typeof(obj) { return typeof obj; }; } else { _typeof = function _typeof(obj) { return obj && typeof Symbol === "function" && obj.constructor === Symbol && obj !== Symbol.prototype ? "symbol" : typeof obj; }; } return _typeof(obj); }

function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }

function _defineProperties(target, props) { for (var i = 0; i < props.length; i++) { var descriptor = props[i]; descriptor.enumerable = descriptor.enumerable || false; descriptor.configurable = true; if ("value" in descriptor) descriptor.writable = true; Object.defineProperty(target, descriptor.key, descriptor); } }

function _createClass(Constructor, protoProps, staticProps) { if (protoProps) _defineProperties(Constructor.prototype, protoProps); if (staticProps) _defineProperties(Constructor, staticProps); return Constructor; }

function _possibleConstructorReturn(self, call) { if (call && (_typeof(call) === "object" || typeof call === "function")) { return call; } return _assertThisInitialized(self); }

function _assertThisInitialized(self) { if (self === void 0) { throw new ReferenceError("this hasn't been initialised - super() hasn't been called"); } return self; }

function _getPrototypeOf(o) { _getPrototypeOf = Object.setPrototypeOf ? Object.getPrototypeOf : function _getPrototypeOf(o) { return o.__proto__ || Object.getPrototypeOf(o); }; return _getPrototypeOf(o); }

function _inherits(subClass, superClass) { if (typeof superClass !== "function" && superClass !== null) { throw new TypeError("Super expression must either be null or a function"); } subClass.prototype = Object.create(superClass && superClass.prototype, { constructor: { value: subClass, writable: true, configurable: true } }); if (superClass) _setPrototypeOf(subClass, superClass); }

function _setPrototypeOf(o, p) { _setPrototypeOf = Object.setPrototypeOf || function _setPrototypeOf(o, p) { o.__proto__ = p; return o; }; return _setPrototypeOf(o, p); }

/**
 * @class qrenderer.graphic.shape.Star 
 * n角星（n>3）
 * @docauthor 大漠穷秋 <damoqiongqiu@126.com>
 */
var defaultConfig = {
  /**
   * @property {String} type
   */
  type: 'star',
  shape: {
    cx: 0,
    cy: 0,
    n: 3,
    r0: null,
    r: 0
  }
};

var Star =
/*#__PURE__*/
function (_Path) {
  _inherits(Star, _Path);

  /**
   * @method constructor Star
   * @param {Object} options 
   */
  function Star(options) {
    _classCallCheck(this, Star);

    return _possibleConstructorReturn(this, _getPrototypeOf(Star).call(this, dataUtil.merge(defaultConfig, options, true)));
  }
  /**
   * @method buildPath
   * 绘制元素路径
   * @param {Object} ctx 
   * @param {String} shape 
   */


  _createClass(Star, [{
    key: "buildPath",
    value: function buildPath(ctx, shape) {
      var n = shape.n;

      if (!n || n < 2) {
        return;
      }

      var x = shape.cx;
      var y = shape.cy;
      var r = shape.r;
      var r0 = shape.r0; // 如果未指定内部顶点外接圆半径，则自动计算

      if (r0 == null) {
        r0 = n > 4 // 相隔的外部顶点的连线的交点，
        // 被取为内部交点，以此计算r0
        ? r * mathCos(2 * PI / n) / mathCos(PI / n) // 二三四角星的特殊处理
        : r / 3;
      }

      var dStep = PI / n;
      var deg = -PI / 2;
      var xStart = x + r * mathCos(deg);
      var yStart = y + r * mathSin(deg);
      deg += dStep; // 记录边界点，用于判断inside

      ctx.moveTo(xStart, yStart);

      for (var i = 0, end = n * 2 - 1, ri; i < end; i++) {
        ri = i % 2 === 0 ? r0 : r;
        ctx.lineTo(x + ri * mathCos(deg), y + ri * mathSin(deg));
        deg += dStep;
      }

      ctx.closePath();
    }
  }]);

  return Star;
}(Path);

module.exports = Star;