A custom layer for heatmaps in react-leaflet. 

A custom layer for heatmaps in react-leaflet

jeremiahrhall

opengov_dev

react-leaflet-heatmap-layer

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- Fix getMaxZoom returning props.radius instead of props.maxZoom, fix misnamed call to getMax instead of getMaxZoom in redraw()

- adds an `onStatsUpdate` prop which is called on redraw with a { min, max } object containing the min and max number of items found for a single coordinate

- Add `fitBoundsOnUpdate` prop to indicate that the map should fit the data in the map on update

- Fix an issue with the gradient property being applied

var _react2 = _interopRequireDefault(_react);

var _reactDom2 = _interopRequireDefault(_reactDom);

var _lodash2 = _interopRequireDefault(_lodash);

var _lodash4 = _interopRequireDefault(_lodash3);

var _lodash5 = require('lodash.foreach');

var _lodash6 = _interopRequireDefault(_lodash5);

var _lodash8 = _interopRequireDefault(_lodash7);

var _lodash10 = _interopRequireDefault(_lodash9);

var _lodash12 = _interopRequireDefault(_lodash11);

var _lodash14 = _interopRequireDefault(_lodash13);

var _lodash15 = require('lodash.isnumber');

var _lodash16 = _interopRequireDefault(_lodash15);

var _leaflet2 = _interopRequireDefault(_leaflet);

var _reactLeaflet = require('react-leaflet');

var _simpleheat2 = _interopRequireDefault(_simpleheat);

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; }

  return (0, _lodash10.default)(arr, isValid).length === arr.length;

  return !(0, _lodash16.default)(num) && !num;

  return isInvalid(loc.lng) || isInvalid(loc.lat);

var HeatmapLayer = function (_MapLayer) {

    return _possibleConstructorReturn(this, _MapLayer.apply(this, arguments));

  HeatmapLayer.prototype.componentDidMount = function componentDidMount() {

    this.leafletElement = _reactDom2.default.findDOMNode(this.refs.container);

    this.props.map.getPanes().overlayPane.appendChild(this.leafletElement);

    this._heatmap = (0, _simpleheat2.default)(this.leafletElement);

  HeatmapLayer.prototype.getMaxZoom = function getMaxZoom(props) {

  HeatmapLayer.prototype.getMinOpacity = function getMinOpacity(props) {

  HeatmapLayer.prototype.getBlur = function getBlur(props) {

  HeatmapLayer.prototype.getHeatmapProps = function getHeatmapProps() {

      minOpacity: this.getMinOpacity(this.props),

      maxZoom: this.getMaxZoom(this.props),

      radius: this.getRadius(this.props),

  HeatmapLayer.prototype.componentWillReceiveProps = function componentWillReceiveProps(nextProps) {

    this.updateHeatmapProps(this.getHeatmapProps(nextProps));

  HeatmapLayer.prototype.updateHeatmapProps = function updateHeatmapProps(nextProps) {

    if (nextProps.radius && (!this.props || nextProps.radius !== this.props.radius)) {

      this._heatmap.radius(nextProps.radius);

      this._heatmap.gradient(nextProps.gradient);

    if (nextProps.max && (!this.props || nextProps.max !== this.props.max)) {

  HeatmapLayer.prototype.componentWillUnmount = function componentWillUnmount() {

    this.props.map.getPanes().overlayPane.removeChild(this.leafletElement);

  HeatmapLayer.prototype.fitBounds = function fitBounds() {

    var lngs = (0, _lodash2.default)(points, this.props.longitudeExtractor);

    var lats = (0, _lodash2.default)(points, this.props.latitudeExtractor);

    var ne = { lng: (0, _lodash14.default)(lngs), lat: (0, _lodash14.default)(lats) };

    var sw = { lng: (0, _lodash12.default)(lngs), lat: (0, _lodash12.default)(lats) };

    if (shouldIgnoreLocation(ne) || shouldIgnoreLocation(sw)) {

    this.props.map.fitBounds(_leaflet2.default.latLngBounds(_leaflet2.default.latLng(sw), _leaflet2.default.latLng(ne)));

  HeatmapLayer.prototype.componentDidUpdate = function componentDidUpdate() {

  HeatmapLayer.prototype.shouldComponentUpdate = function shouldComponentUpdate() {

  HeatmapLayer.prototype.attachEvents = function attachEvents() {

    if (map.options.zoomAnimation && _leaflet2.default.Browser.any3d) {

      map.on('zoomanim', this._animateZoom, this);

  HeatmapLayer.prototype._animateZoom = function _animateZoom(e) {

    var scale = this.props.map.getZoomScale(e.zoom);

    var offset = this.props.map._getCenterOffset(e.center)._multiplyBy(-scale).subtract(this.props.map._getMapPanePos());

    if (_leaflet2.default.DomUtil.setTransform) {

      _leaflet2.default.DomUtil.setTransform(this.refs.container, offset, scale);

      this.refs.container.style[_leaflet2.default.DomUtil.TRANSFORM] = _leaflet2.default.DomUtil.getTranslateString(offset) + ' scale(' + scale + ')';

  HeatmapLayer.prototype.reset = function reset() {

    var topLeft = this.props.map.containerPointToLayerPoint([0, 0]);

    _leaflet2.default.DomUtil.setPosition(this.refs.container, topLeft);

    var maxZoom = this.props.maxZoom === undefined ? this.props.map.getMaxZoom() : this.getMax(this.props);

    var maxZoom = this.props.maxZoom === undefined ? this.props.map.getMaxZoom() : this.getMaxZoom(this.props);

    var v = 1 / Math.pow(2, Math.max(0, Math.min(maxZoom - this.props.map.getZoom(), 12)));

    var panePos = this.props.map._getMapPanePos();

    var getLat = this.props.latitudeExtractor;

    var getLng = this.props.longitudeExtractor;

    var getIntensity = this.props.intensityExtractor;

    var inBounds = function inBounds(p, bounds) {

    var filterUndefined = function filterUndefined(r) {

      return (0, _lodash10.default)(r, function (c) {

    var roundResults = function roundResults(results) {

      return (0, _lodash4.default)(results, function (result, row) {

        return (0, _lodash2.default)(filterUndefined(row), function (cell, key, row) {

          return [Math.round(cell[0]), Math.round(cell[1]), Math.min(cell[2], maxIntensity), cell[3]];

    var accumulateInGrid = function accumulateInGrid(points, leafletMap, bounds) {

      return (0, _lodash4.default)(points, function (grid, point) {

        var latLng = [getLat(point), getLng(point)];

        if (isInvalidLatLngArray(latLng)) {

        var p = leafletMap.latLngToContainerPoint(latLng);

        var x = Math.floor((p.x - offsetX) / cellSize) + 2;

        var y = Math.floor((p.y - offsetY) / cellSize) + 2;

          cell[0] = (cell[0] * cell[2] + p.x * k) / (cell[2] + k); // x

          cell[1] = (cell[1] * cell[2] + p.y * k) / (cell[2] + k); // y

		@@ -0,1 +1,5 @@
		# 0.2.1 Release

		- Fix getMaxZoom returning props.radius instead of props.maxZoom, fix misnamed call to getMax instead of getMaxZoom in redraw()

		# 0.2.0 Release
		@@ -2,0 +6,0 @@

		@@ -117,3 +117,3 @@ 'use strict';
		HeatmapLayer.prototype.getMaxZoom = function getMaxZoom(props) {
		return props.radius \|\| 18;
		return props.maxZoom \|\| 18;
		};
		@@ -240,3 +240,3 @@

		var maxZoom = this.props.maxZoom === undefined ? this.props.map.getMaxZoom() : this.getMax(this.props);
		var maxZoom = this.props.maxZoom === undefined ? this.props.map.getMaxZoom() : this.getMaxZoom(this.props);

		@@ -243,0 +243,0 @@ var v = 1 / Math.pow(2, Math.max(0, Math.min(maxZoom - this.props.map.getZoom(), 12)));

		{
		"name": "react-leaflet-heatmap-layer",
		"version": "0.2.0",
		"version": "0.2.1",
		"description": "A custom layer for heatmaps in react-leaflet",
		@@ -5,0 +5,0 @@ "main": "lib/HeatmapLayer.js",

		@@ -113,3 +113,3 @@ import React from 'react';
		getMaxZoom(props) {
		return props.radius \|\| 18;
		return props.maxZoom \|\| 18;
		}
		@@ -241,3 +241,3 @@
		? this.props.map.getMaxZoom()
		: this.getMax(this.props);
		: this.getMaxZoom(this.props);

		@@ -244,0 +244,0 @@ const v = 1 / Math.pow(

Improved metrics