db17be34f6
git-svn-id: http://svn.openlayers.org/tags/openlayers/release-2.4-rc1@3001 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf
385 lines
11 KiB
JavaScript
385 lines
11 KiB
JavaScript
/* Copyright (c) 2006 MetaCarta, Inc., published under a modified BSD license.
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* See http://svn.openlayers.org/trunk/openlayers/release-license.txt
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* for the full text of the license. */
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/**
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* @class
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*
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* @requires OpenLayers/Layer/EventPane.js
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* @requires OpenLayers/Layer/FixedZoomLevels.js
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*/
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OpenLayers.Layer.Google = OpenLayers.Class.create();
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OpenLayers.Layer.Google.prototype =
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OpenLayers.Class.inherit( OpenLayers.Layer.EventPane,
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OpenLayers.Layer.FixedZoomLevels, {
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/** @final @type int */
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MIN_ZOOM_LEVEL: 0,
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/** @final @type int */
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MAX_ZOOM_LEVEL: 19,
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/** Hardcode these resolutions so that they are more closely
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* tied with the standard wms projection
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*
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* @final @type Array(float) */
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RESOLUTIONS: [1.40625,0.703125,0.3515625,0.17578125,0.087890625,0.0439453125,0.02197265625,0.010986328125,0.0054931640625,0.00274658203125,0.001373291015625,0.0006866455078125,0.00034332275390625,0.000171661376953125,0.0000858306884765625,0.00004291534423828125,.00002145767211914062,.00001072883605957031,.00000536441802978515,.00000268220901489257],
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/** @type GMapType */
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type: null,
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/**
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* @constructor
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*
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* @param {String} name
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*/
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initialize: function(name, options) {
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OpenLayers.Layer.EventPane.prototype.initialize.apply(this, arguments);
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OpenLayers.Layer.FixedZoomLevels.prototype.initialize.apply(this,
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arguments);
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this.addContainerPxFunction();
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},
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/** Load the GMap and register appropriate event listeners. If we can't
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* load GMap2, then display a warning message.
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*
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* @private
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*/
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loadMapObject:function() {
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//has gmaps library has been loaded?
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try {
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// create GMap, hide nav controls
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this.mapObject = new GMap2( this.div );
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// move the ToS and branding stuff up to the pane
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// thanks a *mil* Erik for thinking of this
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var poweredBy = this.div.lastChild;
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this.div.removeChild(poweredBy);
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this.pane.appendChild(poweredBy);
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poweredBy.className = "olLayerGooglePoweredBy gmnoprint";
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poweredBy.style.left = "";
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poweredBy.style.bottom = "";
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var termsOfUse = this.div.lastChild;
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this.div.removeChild(termsOfUse);
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this.pane.appendChild(termsOfUse);
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termsOfUse.className = "olLayerGoogleCopyright";
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termsOfUse.style.right = "";
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termsOfUse.style.bottom = "";
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} catch (e) {
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// do not crash
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}
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},
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/** Overridden from EventPane because if a map type has been specified,
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* we need to attach a listener for the first moveend -- this is how
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* we will know that the map has been centered. Only once the map has
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* been centered is it safe to change the gmap object's map type.
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*
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* @param {OpenLayers.Map} map
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*/
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setMap: function(map) {
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OpenLayers.Layer.EventPane.prototype.setMap.apply(this, arguments);
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if (this.type != null) {
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this.map.events.register("moveend", this, this.setMapType);
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}
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},
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/** The map has been centered, and a map type was specified, so we
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* set the map type on the gmap object, then unregister the listener
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* so that we dont keep doing this every time the map moves.
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*
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* @private
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*/
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setMapType: function() {
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if (this.mapObject.getCenter() != null) {
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this.mapObject.setMapType(this.type);
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this.map.events.unregister("moveend", this, this.setMapType);
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}
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},
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/**
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* @param {Event} evt
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*/
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onMapResize: function() {
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this.mapObject.checkResize();
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},
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/**
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* @param {OpenLayers.Bounds} bounds
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*
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* @returns Corresponding zoom level for a specified Bounds.
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* If mapObject is not loaded or not centered, returns null
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* @type int
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*
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getZoomForExtent: function (bounds) {
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var zoom = null;
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if (this.mapObject != null) {
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var moBounds = this.getMapObjectBoundsFromOLBounds(bounds);
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var moZoom = this.getMapObjectZoomFromMapObjectBounds(moBounds);
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//make sure zoom is within bounds
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var moZoom = Math.min(Math.max(moZoom, this.minZoomLevel),
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this.maxZoomLevel);
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zoom = this.getOLZoomFromMapObjectZoom(moZoom);
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}
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return zoom;
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},
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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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* @param {Object} moBounds
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*
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* @returns An OpenLayers.Bounds, translated from the passed-in
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* MapObject Bounds
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* Returns null if null value is passed in
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* @type OpenLayers.Bounds
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*/
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getOLBoundsFromMapObjectBounds: function(moBounds) {
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var olBounds = null;
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if (moBounds != null) {
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var sw = moBounds.getSouthWest();
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var ne = moBounds.getNorthEast();
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olBounds = new OpenLayers.Bounds(sw.lng(),
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sw.lat(),
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ne.lng(),
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ne.lat() );
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}
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return olBounds;
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},
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/**
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* @param {OpenLayers.Bounds} olBounds
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*
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* @returns A MapObject Bounds, translated from olBounds
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* Returns null if null value is passed in
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* @type Object
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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 = new GLatLng(olBounds.bottom, olBounds.left);
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var ne = new GLatLng(olBounds.top, olBounds.right);
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moBounds = new GLatLngBounds(sw, ne);
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}
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return moBounds;
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},
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/** Hack-on function because GMAPS does not give it to us
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*
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* @param {GLatLng} gLatLng
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*
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* @returns A GPoint specifying gLatLng translated into "Container" coords
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* @type GPoint
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*/
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addContainerPxFunction: function() {
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if (typeof GMap2 != "undefined" && !GMap2.fromLatLngToContainerPixel) {
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GMap2.prototype.fromLatLngToContainerPixel = function(gLatLng) {
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// first we translate into "DivPixel"
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var gPoint = this.fromLatLngToDivPixel(gLatLng);
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// locate the sliding "Div" div
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// it seems like "b" is the main div
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var div = this.b.firstChild.firstChild;
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// adjust by the offset of "Div" and voila!
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gPoint.x += div.offsetLeft;
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gPoint.y += div.offsetTop;
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return gPoint;
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};
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}
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},
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/**
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* @return String with information on why layer is broken, how to get
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* it working.
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* @type String
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*/
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getWarningHTML:function() {
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var html = "";
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html += "The Google Layer was unable to load correctly.<br>";
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html += "<br>";
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html += "To get rid of this message, select a new BaseLayer "
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html += "in the layer switcher in the upper-right corner.<br>";
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html += "<br>";
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html += "Most likely, this is because the Google Maps library";
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html += " script was either not included, or does not contain the";
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html += " correct API key for your site.<br>";
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html += "<br>";
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html += "Developers: For help getting this working correctly, ";
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html += "<a href='http://trac.openlayers.org/wiki/Google' "
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html += "target='_blank'>";
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html += "click here";
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html += "</a>";
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return html;
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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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// Get&Set Center, Zoom
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/** Set the mapObject to the specified center and zoom
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*
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* @param {Object} center MapObject LonLat format
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* @param {int} zoom MapObject zoom format
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*/
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setMapObjectCenter: function(center, zoom) {
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this.mapObject.setCenter(center, zoom);
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},
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/**
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* @returns the mapObject's current center in Map Object format
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* @type Object
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*/
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getMapObjectCenter: function() {
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return this.mapObject.getCenter();
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},
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/**
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* @returns the mapObject's current zoom, in Map Object format
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* @type int
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*/
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getMapObjectZoom: function() {
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return this.mapObject.getZoom();
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},
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// LonLat - Pixel Translation
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/**
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* @param {Object} moPixel MapObject Pixel format
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*
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* @returns MapObject LonLat translated from MapObject Pixel
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* @type Object
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*/
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getMapObjectLonLatFromMapObjectPixel: function(moPixel) {
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return this.mapObject.fromContainerPixelToLatLng(moPixel);
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},
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/**
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* @param {Object} moPixel MapObject Pixel format
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*
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* @returns MapObject Pixel translated from MapObject LonLat
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* @type Object
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*/
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getMapObjectPixelFromMapObjectLonLat: function(moLonLat) {
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return this.mapObject.fromLatLngToContainerPixel(moLonLat);
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},
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// Bounds
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/**
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* @param {Object} moBounds MapObject Bounds format
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*
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* @returns MapObject Zoom for specified MapObject Bounds
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* @type Object
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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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* @param {Object} moLonLat MapObject LonLat format
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*
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* @returns Longitude of the given MapObject LonLat
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* @type float
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*/
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getLongitudeFromMapObjectLonLat: function(moLonLat) {
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return moLonLat.lng();
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},
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/**
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* @param {Object} moLonLat MapObject LonLat format
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*
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* @returns Latitude of the given MapObject LonLat
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* @type float
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*/
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getLatitudeFromMapObjectLonLat: function(moLonLat) {
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return moLonLat.lat();
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},
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/**
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* @param {int} lon float
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* @param {int} lat float
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*
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* @returns MapObject LonLat built from lon and lat params
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* @type Object
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*/
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getMapObjectLonLatFromLonLat: function(lon, lat) {
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return new GLatLng(lat, lon);
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},
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// Pixel
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/**
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* @param {Object} moPixel MapObject Pixel format
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*
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* @returns X value of the MapObject Pixel
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* @type int
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*/
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getXFromMapObjectPixel: function(moPixel) {
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return moPixel.x;
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},
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/**
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* @param {Object} moPixel MapObject Pixel format
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*
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* @returns Y value of the MapObject Pixel
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* @type int
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*/
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getYFromMapObjectPixel: function(moPixel) {
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return moPixel.y;
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},
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/**
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* @param {int} x
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* @param {int} y
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*
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* @returns MapObject Pixel from x and y parameters
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* @type Object
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*/
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getMapObjectPixelFromXY: function(x, y) {
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return new GPoint(x, y);
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},
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/** @final @type String */
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CLASS_NAME: "OpenLayers.Layer.Google"
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});
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