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+/* Copyright (c) 2006-2013 by OpenLayers Contributors (see authors.txt for
+ * full list of contributors). Published under the 2-clause BSD license.
+ * See license.txt in the OpenLayers distribution or repository for the
+ * full text of the license. */
+
+
+/**
+ * @requires OpenLayers/Layer/Google.js
+ */
+
+/**
+ * Constant: OpenLayers.Layer.Google.v3
+ *
+ * Mixin providing functionality specific to the Google Maps API v3.
+ *
+ * To use this layer, you must include the GMaps v3 API in your html.
+ *
+ * Note that this layer configures the google.maps.map object with the
+ * "disableDefaultUI" option set to true. Using UI controls that the Google
+ * Maps API provides is not supported by the OpenLayers API.
+ */
+OpenLayers.Layer.Google.v3 = {
+
+ /**
+ * Constant: DEFAULTS
+ * {Object} It is not recommended to change the properties set here. Note
+ * that Google.v3 layers only work when sphericalMercator is set to true.
+ *
+ * (code)
+ * {
+ * sphericalMercator: true,
+ * projection: "EPSG:900913"
+ * }
+ * (end)
+ */
+ DEFAULTS: {
+ sphericalMercator: true,
+ projection: "EPSG:900913"
+ },
+
+ /**
+ * APIProperty: animationEnabled
+ * {Boolean} If set to true, the transition between zoom levels will be
+ * animated (if supported by the GMaps API for the device used). Set to
+ * false to match the zooming experience of other layer types. Default
+ * is true. Note that the GMaps API does not give us control over zoom
+ * animation, so if set to false, when zooming, this will make the
+ * layer temporarily invisible, wait until GMaps reports the map being
+ * idle, and make it visible again. The result will be a blank layer
+ * for a few moments while zooming.
+ */
+ animationEnabled: true,
+
+ /**
+ * Method: loadMapObject
+ * Load the GMap and register appropriate event listeners.
+ */
+ loadMapObject: function() {
+ if (!this.type) {
+ this.type = google.maps.MapTypeId.ROADMAP;
+ }
+ var mapObject;
+ var cache = OpenLayers.Layer.Google.cache[this.map.id];
+ if (cache) {
+ // there are already Google layers added to this map
+ mapObject = cache.mapObject;
+ // increment the layer count
+ ++cache.count;
+ } else {
+ // this is the first Google layer for this map
+ // create GMap
+ var center = this.map.getCenter();
+ var container = document.createElement('div');
+ container.className = "olForeignContainer";
+ container.style.width = '100%';
+ container.style.height = '100%';
+ mapObject = new google.maps.Map(container, {
+ center: center ?
+ new google.maps.LatLng(center.lat, center.lon) :
+ new google.maps.LatLng(0, 0),
+ zoom: this.map.getZoom() || 0,
+ mapTypeId: this.type,
+ disableDefaultUI: true,
+ keyboardShortcuts: false,
+ draggable: false,
+ disableDoubleClickZoom: true,
+ scrollwheel: false,
+ streetViewControl: false
+ });
+ var googleControl = document.createElement('div');
+ googleControl.style.width = '100%';
+ googleControl.style.height = '100%';
+ mapObject.controls[google.maps.ControlPosition.TOP_LEFT].push(googleControl);
+
+ // cache elements for use by any other google layers added to
+ // this same map
+ cache = {
+ googleControl: googleControl,
+ mapObject: mapObject,
+ count: 1
+ };
+ OpenLayers.Layer.Google.cache[this.map.id] = cache;
+ }
+ this.mapObject = mapObject;
+ this.setGMapVisibility(this.visibility);
+ },
+
+ /**
+ * APIMethod: onMapResize
+ */
+ onMapResize: function() {
+ if (this.visibility) {
+ google.maps.event.trigger(this.mapObject, "resize");
+ }
+ },
+
+ /**
+ * Method: setGMapVisibility
+ * Display the GMap container and associated elements.
+ *
+ * Parameters:
+ * visible - {Boolean} Display the GMap elements.
+ */
+ setGMapVisibility: function(visible) {
+ var cache = OpenLayers.Layer.Google.cache[this.map.id];
+ var map = this.map;
+ if (cache) {
+ var type = this.type;
+ var layers = map.layers;
+ var layer;
+ for (var i=layers.length-1; i>=0; --i) {
+ layer = layers[i];
+ if (layer instanceof OpenLayers.Layer.Google &&
+ layer.visibility === true && layer.inRange === true) {
+ type = layer.type;
+ visible = true;
+ break;
+ }
+ }
+ var container = this.mapObject.getDiv();
+ if (visible === true) {
+ if (container.parentNode !== map.div) {
+ if (!cache.rendered) {
+ var me = this;
+ google.maps.event.addListenerOnce(this.mapObject, 'tilesloaded', function() {
+ cache.rendered = true;
+ me.setGMapVisibility(me.getVisibility());
+ me.moveTo(me.map.getCenter());
+ });
+ } else {
+ map.div.appendChild(container);
+ cache.googleControl.appendChild(map.viewPortDiv);
+ google.maps.event.trigger(this.mapObject, 'resize');
+ }
+ }
+ this.mapObject.setMapTypeId(type);
+ } else if (cache.googleControl.hasChildNodes()) {
+ map.div.appendChild(map.viewPortDiv);
+ map.div.removeChild(container);
+ }
+ }
+ },
+
+ /**
+ * Method: getMapContainer
+ *
+ * Returns:
+ * {DOMElement} the GMap container's div
+ */
+ getMapContainer: function() {
+ return this.mapObject.getDiv();
+ },
+
+ //
+ // TRANSLATION: MapObject Bounds <-> OpenLayers.Bounds
+ //
+
+ /**
+ * APIMethod: getMapObjectBoundsFromOLBounds
+ *
+ * Parameters:
+ * olBounds - {<OpenLayers.Bounds>}
+ *
+ * Returns:
+ * {Object} A MapObject Bounds, translated from olBounds
+ * Returns null if null value is passed in
+ */
+ getMapObjectBoundsFromOLBounds: function(olBounds) {
+ var moBounds = null;
+ if (olBounds != null) {
+ var sw = this.sphericalMercator ?
+ this.inverseMercator(olBounds.bottom, olBounds.left) :
+ new OpenLayers.LonLat(olBounds.bottom, olBounds.left);
+ var ne = this.sphericalMercator ?
+ this.inverseMercator(olBounds.top, olBounds.right) :
+ new OpenLayers.LonLat(olBounds.top, olBounds.right);
+ moBounds = new google.maps.LatLngBounds(
+ new google.maps.LatLng(sw.lat, sw.lon),
+ new google.maps.LatLng(ne.lat, ne.lon)
+ );
+ }
+ return moBounds;
+ },
+
+
+ /************************************
+ * *
+ * MapObject Interface Controls *
+ * *
+ ************************************/
+
+
+ // LonLat - Pixel Translation
+
+ /**
+ * APIMethod: getMapObjectLonLatFromMapObjectPixel
+ *
+ * Parameters:
+ * moPixel - {Object} MapObject Pixel format
+ *
+ * Returns:
+ * {Object} MapObject LonLat translated from MapObject Pixel
+ */
+ getMapObjectLonLatFromMapObjectPixel: function(moPixel) {
+ var size = this.map.getSize();
+ var lon = this.getLongitudeFromMapObjectLonLat(this.mapObject.center);
+ var lat = this.getLatitudeFromMapObjectLonLat(this.mapObject.center);
+ var res = this.map.getResolution();
+
+ var delta_x = moPixel.x - (size.w / 2);
+ var delta_y = moPixel.y - (size.h / 2);
+
+ var lonlat = new OpenLayers.LonLat(
+ lon + delta_x * res,
+ lat - delta_y * res
+ );
+
+ if (this.wrapDateLine) {
+ lonlat = lonlat.wrapDateLine(this.maxExtent);
+ }
+ return this.getMapObjectLonLatFromLonLat(lonlat.lon, lonlat.lat);
+ },
+
+ /**
+ * APIMethod: getMapObjectPixelFromMapObjectLonLat
+ *
+ * Parameters:
+ * moLonLat - {Object} MapObject LonLat format
+ *
+ * Returns:
+ * {Object} MapObject Pixel transtlated from MapObject LonLat
+ */
+ getMapObjectPixelFromMapObjectLonLat: function(moLonLat) {
+ var lon = this.getLongitudeFromMapObjectLonLat(moLonLat);
+ var lat = this.getLatitudeFromMapObjectLonLat(moLonLat);
+ var res = this.map.getResolution();
+ var extent = this.map.getExtent();
+ return this.getMapObjectPixelFromXY((1/res * (lon - extent.left)),
+ (1/res * (extent.top - lat)));
+ },
+
+
+ /**
+ * APIMethod: setMapObjectCenter
+ * Set the mapObject to the specified center and zoom
+ *
+ * Parameters:
+ * center - {Object} MapObject LonLat format
+ * zoom - {int} MapObject zoom format
+ */
+ setMapObjectCenter: function(center, zoom) {
+ if (this.animationEnabled === false && zoom != this.mapObject.zoom) {
+ var mapContainer = this.getMapContainer();
+ google.maps.event.addListenerOnce(
+ this.mapObject,
+ "idle",
+ function() {
+ mapContainer.style.visibility = "";
+ }
+ );
+ mapContainer.style.visibility = "hidden";
+ }
+ this.mapObject.setOptions({
+ center: center,
+ zoom: zoom
+ });
+ },
+
+
+ // Bounds
+
+ /**
+ * APIMethod: getMapObjectZoomFromMapObjectBounds
+ *
+ * Parameters:
+ * moBounds - {Object} MapObject Bounds format
+ *
+ * Returns:
+ * {Object} MapObject Zoom for specified MapObject Bounds
+ */
+ getMapObjectZoomFromMapObjectBounds: function(moBounds) {
+ return this.mapObject.getBoundsZoomLevel(moBounds);
+ },
+
+ /************************************
+ * *
+ * MapObject Primitives *
+ * *
+ ************************************/
+
+
+ // LonLat
+
+ /**
+ * APIMethod: getMapObjectLonLatFromLonLat
+ *
+ * Parameters:
+ * lon - {Float}
+ * lat - {Float}
+ *
+ * Returns:
+ * {Object} MapObject LonLat built from lon and lat params
+ */
+ getMapObjectLonLatFromLonLat: function(lon, lat) {
+ var gLatLng;
+ if(this.sphericalMercator) {
+ var lonlat = this.inverseMercator(lon, lat);
+ gLatLng = new google.maps.LatLng(lonlat.lat, lonlat.lon);
+ } else {
+ gLatLng = new google.maps.LatLng(lat, lon);
+ }
+ return gLatLng;
+ },
+
+ // Pixel
+
+ /**
+ * APIMethod: getMapObjectPixelFromXY
+ *
+ * Parameters:
+ * x - {Integer}
+ * y - {Integer}
+ *
+ * Returns:
+ * {Object} MapObject Pixel from x and y parameters
+ */
+ getMapObjectPixelFromXY: function(x, y) {
+ return new google.maps.Point(x, y);
+ }
+
+};
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