text: import _upperFirst from "lodash/upperFirst";
  
  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 _extends() { _extends = Object.assign || function (target) { for (var i = 1; i < arguments.length; i++) { var source = arguments[i]; for (var key in source) { if (Object.prototype.hasOwnProperty.call(source, key)) { target[key] = source[key]; } } } return target; }; return _extends.apply(this, arguments); }
  
  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 _createSuper(Derived) { return function () { var Super = _getPrototypeOf(Derived), result; if (_isNativeReflectConstruct()) { var NewTarget = _getPrototypeOf(this).constructor; result = Reflect.construct(Super, arguments, NewTarget); } else { result = Super.apply(this, arguments); } return _possibleConstructorReturn(this, result); }; }
  
  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 _isNativeReflectConstruct() { if (typeof Reflect === "undefined" || !Reflect.construct) return false; if (Reflect.construct.sham) return false; if (typeof Proxy === "function") return true; try { Date.prototype.toString.call(Reflect.construct(Date, [], function () {})); return true; } catch (e) { return false; } }
  
  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); }
  
  /**
   * @fileOverview Curve
   */
  import React, { PureComponent } from 'react';
  import { symbol as shapeSymbol, symbolCircle, symbolCross, symbolDiamond, symbolSquare, symbolStar, symbolTriangle, symbolWye } from 'd3-shape';
  import classNames from 'classnames';
  import { filterProps } from '../util/types';
  var symbolFactories = {
    symbolCircle: symbolCircle,
    symbolCross: symbolCross,
    symbolDiamond: symbolDiamond,
    symbolSquare: symbolSquare,
    symbolStar: symbolStar,
    symbolTriangle: symbolTriangle,
    symbolWye: symbolWye
  };
  var RADIAN = Math.PI / 180;
  
  var getSymbolFactory = function getSymbolFactory(type) {
    var name = "symbol".concat(_upperFirst(type));
    return symbolFactories[name] || symbolCircle;
  };
  
  var calculateAreaSize = function calculateAreaSize(size, sizeType, type) {
    if (sizeType === 'area') {
      return size;
    }
  
    switch (type) {
      case 'cross':
        return 5 * size * size / 9;
  
      case 'diamond':
        return 0.5 * size * size / Math.sqrt(3);
  
      case 'square':
        return size * size;
  
      case 'star':
        {
          var angle = 18 * RADIAN;
          return 1.25 * size * size * (Math.tan(angle) - Math.tan(angle * 2) * Math.pow(Math.tan(angle), 2));
        }
  
      case 'triangle':
        return Math.sqrt(3) * size * size / 4;
  
      case 'wye':
        return (21 - 10 * Math.sqrt(3)) * size * size / 8;
  
      default:
        return Math.PI * size * size / 4;
    }
  };
  
  var Symbols = /*#__PURE__*/function (_PureComponent) {
    _inherits(Symbols, _PureComponent);
  
    var _super = _createSuper(Symbols);
  
    function Symbols() {
      _classCallCheck(this, Symbols);
  
      return _super.apply(this, arguments);
    }
  
    _createClass(Symbols, [{
      key: "getPath",
  
      /**
       * Calculate the path of curve
       * @return {String} path
       */
      value: function getPath() {
        var _this$props = this.props,
            size = _this$props.size,
            sizeType = _this$props.sizeType,
            type = _this$props.type;
        var symbolFactory = getSymbolFactory(type);
        var symbol = shapeSymbol().type(symbolFactory).size(calculateAreaSize(size, sizeType, type));
        return symbol();
      }
    }, {
      key: "render",
      value: function render() {
        var _this$props2 = this.props,
            className = _this$props2.className,
            cx = _this$props2.cx,
            cy = _this$props2.cy,
            size = _this$props2.size;
  
        if (cx === +cx && cy === +cy && size === +size) {
          return /*#__PURE__*/React.createElement("path", _extends({}, filterProps(this.props, true), {
            className: classNames('recharts-symbols', className),
            transform: "translate(".concat(cx, ", ").concat(cy, ")"),
            d: this.getPath()
          }));
        }
  
        return null;
      }
    }]);
  
    return Symbols;
  }(PureComponent);
  
  Symbols.defaultProps = {
    type: 'circle',
    size: 64,
    sizeType: 'area'
  };
  
  Symbols.registerSymbol = function (key, factory) {
    symbolFactories["symbol".concat(_upperFirst(key))] = factory;
  };
  
  export default Symbols;