openstreetmap-website/app/assets/javascripts/map.js.erb

// Leaflet extensions
L.extend(L.LatLngBounds.prototype, {
  getSouthLat: function () {
    return this._southWest.lat;
  },

  getWestLng: function () {
    return this._southWest.lng;
  },

  getNorthLat: function () {
    return this._northEast.lat;
  },

  getEastLng: function () {
    return this._northEast.lng;
  },

  toBBOX: function () {
    var decimal = 6;
    var mult = Math.pow(10, decimal);
    var xmin = Math.round(this.getWestLng() * mult) / mult;
    var ymin = Math.round(this.getSouthLat() * mult) / mult;
    var xmax = Math.round(this.getEastLng() * mult) / mult;
    var ymax = Math.round(this.getNorthLat() * mult) / mult;
    return xmin + "," + ymin + "," + xmax + "," + ymax;
  },

  getSize: function () {
    return (this._northEast.lat - this._southWest.lat) *
           (this._northEast.lng - this._southWest.lng);
  }
});

L.extend(L.Bounds.prototype, {
  getWidth: function () {
   return this.max.x - this.min.x;
  },

  getHeight: function () {
   return this.max.y - this.min.y;
  }
});

L.Icon.Default.imagePath = <%= "#{asset_prefix}/images".to_json %>;

var map;

var layers = [
  {
    klass: L.OSM.Mapnik,
    attribution: "",
    keyid: "mapnik",
    layerCode: "M",
    name: I18n.t("javascripts.map.base.standard")
  },
  {
    klass: L.OSM.CycleMap,
    attribution: "Tiles courtesy of <a href='http://www.opencyclemap.org/' target='_blank'>Andy Allan</a>",
    keyid: "cyclemap",
    layerCode: "C",
    name: I18n.t("javascripts.map.base.cycle_map")
  },
  {
    klass: L.OSM.TransportMap,
    attribution: "Tiles courtesy of <a href='http://www.opencyclemap.org/' target='_blank'>Andy Allan</a>",
    keyid: "transportmap",
    layerCode: "T",
    name: I18n.t("javascripts.map.base.transport_map")
  },
  {
    klass: L.OSM.MapQuestOpen,
    attribution: "Tiles courtesy of <a href='http://www.mapquest.com/' target='_blank'>MapQuest</a> <img src='http://developer.mapquest.com/content/osm/mq_logo.png'>",
    keyid: "mapquest",
    layerCode: "Q",
    name: I18n.t("javascripts.map.base.mapquest")
  }
];

function createMap(divName, options) {
  options = $.extend({zoomControl: true, panZoomControl: true, layerControl: true}, options);

  map = L.map(divName, $.extend({}, options, {panControl: false, zoomsliderControl: false, maxZoom: 18}));

  if (map.attributionControl) {
    map.attributionControl.setPrefix('');
  }

  if (options.panZoomControl) {
    new L.Control.Pan().addTo(map);
    new L.Control.Zoomslider({stepHeight: 7}).addTo(map);
  }

  var layersControl = L.control.layers();

  if (options.layerControl) {
    layersControl.addTo(map);
    map.layersControl = layersControl;
  }

  for (var i = 0; i < layers.length; i++) {
    layers[i].layer = new (layers[i].klass)(layers[i]);
    layersControl.addBaseLayer(layers[i].layer, layers[i].name);
  }

  layers[0].layer.addTo(map);

  $("#" + divName).on("resized", function () {
    map.invalidateSize();
  });

  return map;
}

function getUserIcon(url) {
  return L.icon({
    iconUrl: url || <%= asset_path('marker-red.png').to_json %>,
    iconSize: [25, 41],
    iconAnchor: [12, 41],
    popupAnchor: [1, -34],
    shadowUrl: <%= asset_path('images/marker-shadow.png').to_json %>,
    shadowSize: [41, 41]
  });
}

function addObjectToMap(object, zoom, callback) {
  $.ajax({
    url: OSM.apiUrl(object),
    dataType: "xml",
    success: function (xml) {
      var layer = new L.OSM.DataLayer(xml, {
        style: {
          strokeColor: "blue",
          strokeWidth: 3,
          strokeOpacity: 0.5,
          fillOpacity: 0.2,
          fillColor: "lightblue",
          pointRadius: 6
        }
      });

      var bounds = layer.getBounds();

      if (zoom) {
        map.fitBounds(bounds);
      }

      if (callback) {
        callback(bounds);
      }

      layer.addTo(map);
    }
  });
}

function addBoxToMap(bounds) {
  var box = L.rectangle(bounds, {
    weight: 2,
    color: '#e90',
    fillOpacity: 0
  });

  box.addTo(map);

  return box;
}

function getMapBaseLayer() {
  for (var i = 0; i < layers.length; i++) {
    if (map.hasLayer(layers[i].layer)) {
      return layers[i];
    }
  }
}

function getMapLayers() {
  for (var i = 0; i < layers.length; i++) {
    if (map.hasLayer(layers[i].layer)) {
      return layers[i].layerCode;
    }
  }

  return "";
}

function setMapLayers(layerConfig) {
  var foundLayer = false;
  for (var i = 0; i < layers.length; i++) {
    if (layerConfig.indexOf(layers[i].layerCode) >= 0) {
      map.addLayer(layers[i].layer);
      foundLayer = true;
    } else {
      map.removeLayer(layers[i].layer);
    }
  }
  if (!foundLayer) {
    map.addLayer(layers[0].layer);
  }
}