kepler.gl/src/layers/dist/hexagon-layer/hexagon-utils.js

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

"use strict";

var _interopRequireDefault = require("@babel/runtime/helpers/interopRequireDefault");
Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.hexagonToPolygonGeo = hexagonToPolygonGeo;
var _core = require("@deck.gl/core");
var _console = _interopRequireDefault(require("global/console"));
// SPDX-License-Identifier: MIT
// Copyright contributors to the kepler.gl project

function hexagonToPolygonGeo(object, properties, radius, mapState, coordinate) {
  var viewport = new _core.WebMercatorViewport(mapState);
  var pos = object.position || coordinate;
  var position = pos ? Array.from(pos) : null;
  if (!position || position.length < 2) {
    return null;
  }
  var screenCenter = viewport.projectFlat(position);
  var _viewport$getDistance = viewport.getDistanceScales(position),
    unitsPerMeter = _viewport$getDistance.unitsPerMeter;
  if (!Array.isArray(unitsPerMeter)) {
    _console["default"].warn("unitsPerMeter is undefined");
    return null;
  }
  var pixRadius = radius * unitsPerMeter[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
  };
}
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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