react-simple-pie-chart/build/npm/pie_chart.js

A React component to generate simple pie charts.

'use strict';

var _createClass = (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); } } return function (Constructor, protoProps, staticProps) { if (protoProps) defineProperties(Constructor.prototype, protoProps); if (staticProps) defineProperties(Constructor, staticProps); return Constructor; }; })();

Object.defineProperty(exports, "__esModule", {
  value: true
});

var _react = require('react');

var _react2 = _interopRequireDefault(_react);

var _propTypes = require('prop-types');

var _propTypes2 = _interopRequireDefault(_propTypes);

function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }

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

function _possibleConstructorReturn(self, call) { if (!self) { throw new ReferenceError("this hasn't been initialised - super() hasn't been called"); } return call && (typeof call === "object" || typeof call === "function") ? call : self; }

function _inherits(subClass, superClass) { if (typeof superClass !== "function" && superClass !== null) { throw new TypeError("Super expression must either be null or a function, not " + typeof superClass); } subClass.prototype = Object.create(superClass && superClass.prototype, { constructor: { value: subClass, enumerable: false, writable: true, configurable: true } }); if (superClass) Object.setPrototypeOf ? Object.setPrototypeOf(subClass, superClass) : subClass.__proto__ = superClass; }

var size = 100;
var radCircumference = Math.PI * 2;
var center = size / 2;
var radius = center - 1; // padding to prevent clipping

/**
 * @param {Object[]} slices
 * @return {Object[]}
 */
function renderPaths(slices) {
  var total = slices.reduce(function (totalValue, _ref) {
    var value = _ref.value;
    return totalValue + value;
  }, 0);

  var radSegment = 0;
  var lastX = radius;
  var lastY = 0;

  return slices.map(function (_ref2, index) {
    var color = _ref2.color;
    var value = _ref2.value;

    // Should we just draw a circle?
    if (value === total) {
      return _react2.default.createElement('circle', {
        r: radius,
        cx: center,
        cy: center,
        fill: color,
        key: index
      });
    }

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

    var valuePercentage = value / total;

    // Should the arc go the long way round?
    var longArc = valuePercentage <= 0.5 ? 0 : 1;

    radSegment += valuePercentage * radCircumference;
    var nextX = Math.cos(radSegment) * radius;
    var nextY = Math.sin(radSegment) * radius;

    // d is a string that describes the path of the slice.
    // The weirdly placed minus signs [eg, (-(lastY))] are due to the fact
    // that our calculations are for a graph with positive Y values going up,
    // but on the screen positive Y values go down.
    var d = ['M ' + center + ',' + center, 'l ' + lastX + ',' + -lastY, 'a' + radius + ',' + radius, '0', longArc + ',0', nextX - lastX + ',' + -(nextY - lastY), 'z'].join(' ');

    lastX = nextX;
    lastY = nextY;

    return _react2.default.createElement('path', { d: d, fill: color, key: index });
  });
}

/**
 * Generates an SVG pie chart.
 * @see {http://wiki.scribus.net/canvas/Making_a_Pie_Chart}
 */

var PieChart = (function (_React$Component) {
  _inherits(PieChart, _React$Component);

  function PieChart() {
    _classCallCheck(this, PieChart);

    return _possibleConstructorReturn(this, Object.getPrototypeOf(PieChart).apply(this, arguments));
  }

  _createClass(PieChart, [{
    key: 'render',

    /**
     * @return {Object}
     */
    value: function render() {
      var border = this.props.borderWidth > 0 ? _react2.default.createElement('circle', {
        cx: center,
        cy: center,
        r: radius,
        stroke: this.props.borderColor,
        strokeWidth: this.props.borderWidth,
        fill: 'transparent'
      }) : null;

      return _react2.default.createElement(
        'svg',
        { viewBox: '0 0 ' + size + ' ' + size },
        _react2.default.createElement(
          'g',
          { transform: 'rotate(-90 ' + center + ' ' + center + ')' },
          renderPaths(this.props.slices)
        ),
        border
      );
    }
  }]);

  return PieChart;
})(_react2.default.Component);

exports.default = PieChart;

PieChart.propTypes = {
  slices: _propTypes2.default.arrayOf(_propTypes2.default.shape({
    color: _propTypes2.default.string.isRequired, // hex color
    value: _propTypes2.default.number.isRequired
  })).isRequired,
  borderColor: _propTypes2.default.string,
  borderWidth: _propTypes2.default.number
};

PieChart.defaultProps = {
  borderColor: '#FFFFFF',
  borderWidth: 0
};
module.exports = exports['default'];