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

var vec2 = require("../../core/utils/vector");

var curveUtil = require("../../core/utils/curve_util");

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

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.BezierCurve 
 * 贝塞尔曲线
 * @docauthor 大漠穷秋 <damoqiongqiu@126.com>
 */
var defaultConfig = {
  /**
   * @property {String} type
   */
  type: 'bezier-curve',
  shape: {
    x1: 0,
    y1: 0,
    x2: 0,
    y2: 0,
    cpx1: 0,
    cpy1: 0,
    percent: 1
  },
  style: {
    stroke: '#000',
    fill: null
  }
};
var out = [];

function someVectorAt(shape, t, isTangent) {
  var cpx2 = shape.cpx2;
  var cpy2 = shape.cpy2;

  if (cpx2 === null || cpy2 === null) {
    return [(isTangent ? curveUtil.cubicDerivativeAt : curveUtil.cubicAt)(shape.x1, shape.cpx1, shape.cpx2, shape.x2, t), (isTangent ? curveUtil.cubicDerivativeAt : curveUtil.cubicAt)(shape.y1, shape.cpy1, shape.cpy2, shape.y2, t)];
  } else {
    return [(isTangent ? curveUtil.quadraticDerivativeAt : curveUtil.quadraticAt)(shape.x1, shape.cpx1, shape.x2, t), (isTangent ? curveUtil.quadraticDerivativeAt : curveUtil.quadraticAt)(shape.y1, shape.cpy1, shape.y2, t)];
  }
}

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

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

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


  _createClass(BezierCurve, [{
    key: "buildPath",
    value: function buildPath(ctx, shape) {
      var x1 = shape.x1;
      var y1 = shape.y1;
      var x2 = shape.x2;
      var y2 = shape.y2;
      var cpx1 = shape.cpx1;
      var cpy1 = shape.cpy1;
      var cpx2 = shape.cpx2;
      var cpy2 = shape.cpy2;
      var percent = shape.percent;

      if (percent === 0) {
        return;
      }

      ctx.moveTo(x1, y1);

      if (cpx2 == null || cpy2 == null) {
        if (percent < 1) {
          curveUtil.quadraticSubdivide(x1, cpx1, x2, percent, out);
          cpx1 = out[1];
          x2 = out[2];
          curveUtil.quadraticSubdivide(y1, cpy1, y2, percent, out);
          cpy1 = out[1];
          y2 = out[2];
        }

        ctx.quadraticCurveTo(cpx1, cpy1, x2, y2);
      } else {
        if (percent < 1) {
          curveUtil.cubicSubdivide(x1, cpx1, cpx2, x2, percent, out);
          cpx1 = out[1];
          cpx2 = out[2];
          x2 = out[3];
          curveUtil.cubicSubdivide(y1, cpy1, cpy2, y2, percent, out);
          cpy1 = out[1];
          cpy2 = out[2];
          y2 = out[3];
        }

        ctx.bezierCurveTo(cpx1, cpy1, cpx2, cpy2, x2, y2);
      }
    }
    /**
     * Get point at percent
     * @param  {Number} t
     * @return {Array<Number>}
     */

  }, {
    key: "pointAt",
    value: function pointAt(t) {
      return someVectorAt(this.shape, t, false);
    }
    /**
     * Get tangent at percent
     * @param  {Number} t
     * @return {Array<Number>}
     */

  }, {
    key: "tangentAt",
    value: function tangentAt(t) {
      var p = someVectorAt(this.shape, t, true);
      return vec2.normalize(p, p);
    }
  }]);

  return BezierCurve;
}(Path);

module.exports = BezierCurve;