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