kepler.gl/dist/layers/hexagon-layer/hexagon-utils.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.hexagonToPolygonGeo = hexagonToPolygonGeo;

var _deck = require('deck.gl');

function hexagonToPolygonGeo(_ref, properties, radius, mapState) {
  var object = _ref.object;

  var viewport = new _deck.WebMercatorViewport(mapState);

  var screenCenter = viewport.projectFlat(object.centroid);

  var _viewport$getDistance = viewport.getDistanceScales(),
      pixelsPerMeter = _viewport$getDistance.pixelsPerMeter;

  var pixRadius = radius * pixelsPerMeter[0];

  var coordinates = [];

  for (var i = 0; i < 6; i++) {
    var vertex = hex_corner(screenCenter, pixRadius, i);
    coordinates.push(viewport.unprojectFlat(vertex));
  }

  coordinates.push(coordinates[0]);

  return {
    geometry: {
      coordinates: coordinates,
      type: 'LineString'
    },
    properties: properties
  };
} // 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 hex_corner(center, radius, i) {
  var angle_deg = 60 * i + 30;
  var angle_rad = Math.PI / 180 * angle_deg;

  return [center[0] + radius * Math.cos(angle_rad), center[1] + radius * Math.sin(angle_rad)];
}
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