kepler.gl/dist/deckgl-layers/hexagon-layer/hexagon-aggregator.js

kepler.gl is a webgl based application to visualize large scale location data in the browser

'use strict';

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

var _d3Hexbin = require('d3-hexbin');

/**
 * Use d3-hexbin to performs hexagonal binning from geo points to hexagons
 * @param {Array} data - array of points
 * @param {Number} radius - hexagon radius in meter
 * @param {function} getPosition - get points lon lat
 * @param {Object} viewport - current viewport object

 * @return {Object} - hexagons and countRange
 */
function pointToHexbin(_ref, viewport) {
  var data = _ref.data,
      radius = _ref.radius,
      getPosition = _ref.getPosition;

  // get hexagon radius in mercator world unit
  var radiusInPixel = getRadiusInPixel(radius, viewport);

  // add world space coordinates to points
  // filter empty bins
  var screenPoints = data.reduce(function (accu, pt) {
    var lat = getPosition(pt)[1];
    var lng = getPosition(pt)[0];

    if (!Number.isFinite(lat) || !Number.isFinite(lng)) {
      return accu;
    }

    accu.push(Object.assign({
      screenCoord: viewport.projectFlat(getPosition(pt))
    }, pt));

    return accu;
  }, []);

  var newHexbin = (0, _d3Hexbin.hexbin)().radius(radiusInPixel).x(function (d) {
    return d.screenCoord[0];
  }).y(function (d) {
    return d.screenCoord[1];
  });

  var hexagonBins = newHexbin(screenPoints);

  return {
    hexagons: hexagonBins.map(function (hex, index) {
      return {
        centroid: viewport.unprojectFlat([hex.x, hex.y]),
        points: hex,
        index: index
      };
    })
  };
}

/**
 * Get radius in mercator world space coordinates from meter
 * @param {Number} radius - in meter
 * @param {Object} viewport - current viewport object

 * @return {Number} radius in mercator world spcae coordinates
 */
// Copyright (c) 2018 Uber Technologies, Inc.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.

function getRadiusInPixel(radius, viewport) {
  var _viewport$getDistance = viewport.getDistanceScales(),
      pixelsPerMeter = _viewport$getDistance.pixelsPerMeter;

  // x, y distance should be the same


  return radius * pixelsPerMeter[0];
}
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