react-svg-line-chart/lib/components/Path/index.js

A lightweight responsive line chart component for React using only SVG

"use strict";

exports.__esModule = true;

var _templateObject = _taggedTemplateLiteralLoose(["\n  fill: ", ";\n  opacity: ", ";\n  stroke: none;\n"], ["\n  fill: ", ";\n  opacity: ", ";\n  stroke: none;\n"]),
    _templateObject2 = _taggedTemplateLiteralLoose(["\n  fill: none;\n  opacity: ", ";\n  stroke-width: ", ";\n  stroke: ", ";\n"], ["\n  fill: none;\n  opacity: ", ";\n  stroke-width: ", ";\n  stroke: ", ";\n"]);

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

var _propTypes2 = _interopRequireDefault(_propTypes);

var _react = require("react");

var _react2 = _interopRequireDefault(_react);

var _styledComponents = require("styled-components");

var _styledComponents2 = _interopRequireDefault(_styledComponents);

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; }

function _taggedTemplateLiteralLoose(strings, raw) { strings.raw = raw; return strings; }

var SvgArea = _styledComponents2.default.path(_templateObject, function (props) {
  return props.color;
}, function (props) {
  return props.opacity;
});

var SvgPath = _styledComponents2.default.path(_templateObject2, function (props) {
  return props.opacity;
}, function (props) {
  return props.width;
}, function (props) {
  return props.color;
});

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

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

    return _possibleConstructorReturn(this, _React$Component.apply(this, arguments));
  }

  Path.prototype.getBasisPoint = function getBasisPoint(i) {
    var _props = this.props,
        data = _props.data,
        pathSmoothing = _props.pathSmoothing;

    var totalData = data.length - 1;
    var iPoint = i < 0 ? 0 : i > totalData ? totalData : i;
    var point = data[iPoint];
    var ratio = 1 - pathSmoothing;
    var tangent = iPoint / totalData;
    var firstPoint = data[0];
    var distance = {
      x: data[totalData].x - firstPoint.x,
      y: data[totalData].y - firstPoint.y
    };
    return {
      x: ratio * point.x + (1 - ratio) * (firstPoint.x + tangent * distance.x),
      y: ratio * point.y + (1 - ratio) * (firstPoint.y + tangent * distance.y)
    };
  };

  Path.prototype.getCurvePath = function getCurvePath(i) {
    var _props2 = this.props,
        getX = _props2.getX,
        getY = _props2.getY;

    var pCurrent = this.getBasisPoint(i);
    var pMinus1 = this.getBasisPoint(i - 1);
    var pMinus2 = this.getBasisPoint(i - 2);

    var x1 = (2 * pMinus2.x + pMinus1.x) / 3;
    var y1 = (2 * pMinus2.y + pMinus1.y) / 3;
    var x2 = (pMinus2.x + 2 * pMinus1.x) / 3;
    var y2 = (pMinus2.y + 2 * pMinus1.y) / 3;
    var x3 = (pMinus2.x + 4 * pMinus1.x + pCurrent.x) / 6;
    var y3 = (pMinus2.y + 4 * pMinus1.y + pCurrent.y) / 6;

    return "C\n      " + getX(x1) + "\n      " + getY(y1) + "\n      " + getX(x2) + "\n      " + getY(y2) + "\n      " + getX(x3) + "\n      " + getY(y3) + "\n    ";
  };

  Path.prototype.getLinePath = function getLinePath(point) {
    var _props3 = this.props,
        getX = _props3.getX,
        getY = _props3.getY;

    return "L " + getX(point.x) + " " + getY(point.y);
  };

  Path.prototype.getPath = function getPath() {
    var _this2 = this;

    var _props4 = this.props,
        data = _props4.data,
        getX = _props4.getX,
        getY = _props4.getY,
        pathSmoothing = _props4.pathSmoothing;

    var isSmooth = pathSmoothing !== null && pathSmoothing >= 0 && pathSmoothing <= 1 && data.length > 1;
    var d = data.reduce(function (acc, point, i) {
      var partialPath = isSmooth ? _this2.getCurvePath(i) : _this2.getLinePath(point);
      return i === 0 ? "M " + getX(point.x) + " " + getY(point.y) + " " : acc + " " + partialPath + " ";
    }, "");

    if (isSmooth) {
      d += this.getCurvePath(data.length);
      d += "L " + getX(data[data.length - 1].x) + " " + getY(data[data.length - 1].y) + " ";
    }

    return d;
  };

  Path.prototype.getAreaPath = function getAreaPath() {
    var _props5 = this.props,
        data = _props5.data,
        getX = _props5.getX,
        getY = _props5.getY;

    return "\n      " + this.getPath() + "\n      L " + getX(data[data.length - 1].x) + " " + getY(0) + "\n      L " + getX(data[0].x) + " " + getY(0) + "\n    ";
  };

  Path.prototype.render = function render() {
    var _props6 = this.props,
        areaColor = _props6.areaColor,
        areaOpacity = _props6.areaOpacity,
        areaVisible = _props6.areaVisible,
        pathColor = _props6.pathColor,
        pathOpacity = _props6.pathOpacity,
        pathVisible = _props6.pathVisible,
        pathWidth = _props6.pathWidth;

    return pathVisible || areaVisible ? _react2.default.createElement(
      "g",
      null,
      pathVisible && _react2.default.createElement(SvgPath, {
        d: this.getPath(),
        opacity: pathOpacity,
        color: pathColor,
        width: pathWidth
      }),
      areaVisible && _react2.default.createElement(SvgArea, {
        d: this.getAreaPath(),
        color: areaColor,
        opacity: areaOpacity
      })
    ) : null;
  };

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

Path.propTypes = process.env.NODE_ENV !== "production" ? {
  areaColor: _propTypes2.default.string,
  areaOpacity: _propTypes2.default.number,
  areaVisible: _propTypes2.default.bool,
  data: _propTypes2.default.arrayOf(_propTypes2.default.shape({
    x: _propTypes2.default.number,
    y: _propTypes2.default.number
  })).isRequired,
  getX: _propTypes2.default.func,
  getY: _propTypes2.default.func,
  pathColor: _propTypes2.default.string,
  pathOpacity: _propTypes2.default.number,
  pathSmoothing: _propTypes2.default.number,
  pathVisible: _propTypes2.default.bool,
  pathWidth: _propTypes2.default.number
} : {};

Path.defaultProps = {
  areaColor: "#34495e",
  areaOpacity: 0.5,
  areaVisible: false,
  getX: function getX(x) {
    return x;
  },
  getY: function getY(y) {
    return y;
  },
  pathColor: "#34495e",
  pathOpacity: 1,
  pathSmoothing: null,
  pathVisible: true,
  pathWidth: 2
};

exports.default = Path;
module.exports = exports["default"];