An IITC plugin that displays portal counts for different s2 cell levels

s2-portal-counts.user.js

// ==UserScript==
// @id             iitc-plugin-s2-portal-counts@MzHub
// @name           IITC plugin: s2 Portal Counts
// @category       Portal Info
// @version        0.1.0
// @namespace      https://github.com/jonatkins/ingress-intel-total-conversion
// @description    Displays portal counts for different s2 cell levels
// @include        https://www.ingress.com/intel*
// @include        http://www.ingress.com/intel*
// @match          https://www.ingress.com/intel*
// @match          http://www.ingress.com/intel*
// @grant          none
// ==/UserScript==

function wrapper() {

  // Ensure plugin framework exists, even if IITC is not yet loaded
  if (typeof window.plugin !== 'function') {
    window.plugin = function() {};
  }

  window.plugin.s2PortalCounts = function() {};

  window.plugin.s2PortalCounts.setup = setup;

  if (window.iitcLoaded && typeof window.plugin.s2PortalCounts.setup === 'function') {
    window.plugin.s2PortalCounts.setup();
  }
  else if (window.bootPlugins) {
    window.bootPlugins.push(window.plugin.s2PortalCounts.setup);
  }
  else {
    window.bootPlugins = [window.plugin.s2PortalCounts.setup];
  }

  function setup() {

    var scriptEl;

    scriptEl = document.createElement('script');
    scriptEl.src = 'https://cdn.rawgit.com/dcodeIO/long.js/master/dist/long.min.js';
    document.body.appendChild(scriptEl);

    scriptEl = document.createElement('script');
    scriptEl.src = 'https://cdn.rawgit.com/hunterjm/s2-geometry.js/0cc25036/src/s2geometry.js';
    document.body.appendChild(scriptEl);

    var maxLevel = 20;
    var minLevel = 13;
    var isActive = false;
    var polygons = [];

    map.on('click', handleMapClick);

    function S2CellId_lsb(idAsLong) {
      return idAsLong.and(idAsLong.negate());
    }
    function S2CellId_RangeMin(idAsLong) {
      return idAsLong.sub(S2CellId_lsb(idAsLong).subtract(1));
    }
    function S2CellId_RangeMax(idAsLong) {
      return idAsLong.add(S2CellId_lsb(idAsLong).subtract(1));
    }
    function S2CellId_Contains(idAsLongA, idAsLongB) {
      return S2CellId_RangeMin(idAsLongA).lte(idAsLongB) && idAsLongB.lte(S2CellId_RangeMax(idAsLongA));
    }

    function latlngToCellId(latlng, level) {
      if (level === undefined) {
        level = 30;
      }
      var idAsLong = getIdAsLongFromLatlng(latlng, level);
      var idAsHex = idAsLong.toString(16);
      var idTruncated = idAsHex.replace(/0+$/, '');
      return idTruncated;
    }

    function getIdAsLongFromLatlng(latlng, level) {
      if (level === undefined) {
        level = 30;
      }
      var cellKey = S2.S2Cell.latLngToKey(latlng.lat, latlng.lng, level);
      var idAsDecimalString = S2.keyToId(cellKey);
      var idAsLong = dcodeIO.Long.fromString(idAsDecimalString);
      return idAsLong;
    }

    function getCorners(latlng, level) {
      if (level === undefined) {
        level = 30;
      }
      var cell = S2.S2Cell.FromLatLng(latlng, level);
      var corners = cell.getCornerLatLngs();
      return corners;
    }

    function getContainedPortals(latlng, level) {
      if (level === undefined) {
        level = 30;
      }
      var containedPortals = [];
      var idAsLong = getIdAsLongFromLatlng(latlng, level);
      var portalCellIdAsLong;
      var portalId;
      var portal;
      for (portalId in portals) {
        portal = portals[portalId];
        if (portal.cellIdAsLong === undefined) {
          portal.cellIdAsLong = getIdAsLongFromLatlng(portal._latlng);
        }
        if (S2CellId_Contains(idAsLong, portal.cellIdAsLong)) {
          containedPortals.push(portal);
        }
      }
      return containedPortals;
    }

    function handleMapClick(e) {
      var i;
      var len;
      var level;
      var polygon;

      if (isActive) {
        len = polygons.length;
        for (i = 0; i < len; i++) {
          map.removeLayer(polygons[i]);
        }
        isActive = false;
        return;
      }

      isActive = true;

      for (level = minLevel; level <= maxLevel; level++) {
        polygon = L.polygon(getCorners(e.latlng, level), {
          color: 'red',
          weight: level == 14 || level == 15 || level == 17 ? 3 : 1,
          opacity: 1,
          fillOpacity: 0.05,
        }).addTo(map);
        polygon._origLatlng = e.latlng;
        polygon._origLevel = level;
        polygon.on('click', handlePolygonClick);
        polygon.bindPopup('Level ' + level);
        polygons.push(polygon);
      }
    }

    function handlePolygonClick() {
      var containedPortalCount = getContainedPortals(this._origLatlng, this._origLevel).length;
      this.bindPopup('Level ' + this._origLevel + ' cell<br>Portals: ' + containedPortalCount);
    }

  }

}

// Inject plugin into page
var script = document.createElement('script');
script.appendChild(document.createTextNode('(' + wrapper + ')();'));
(document.body || document.head || document.documentElement).appendChild(script);

Line 41:
scriptEl.src = 'https://cdn.rawgit.com/dcodeIO/long.js/master/dist/long.js';