e4b7c6de53
git-svn-id: http://svn.openlayers.org/trunk/openlayers@6442 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf
521 lines
15 KiB
JavaScript
521 lines
15 KiB
JavaScript
/* Copyright (c) 2006-2008 MetaCarta, Inc., published under the Clear BSD
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* license. See http://svn.openlayers.org/trunk/openlayers/license.txt for the
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* full text of the license. */
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/**
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* @requires OpenLayers/Layer/SphericalMercator.js
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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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/**
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* Class: OpenLayers.Layer.Google
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*
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* Inherits from:
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* - <OpenLayers.Layer.SphericalMercator>
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* - <OpenLayers.Layer.EventPane>
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* - <OpenLayers.Layer.FixedZoomLevels>
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*/
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OpenLayers.Layer.Google = OpenLayers.Class(
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OpenLayers.Layer.EventPane,
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OpenLayers.Layer.FixedZoomLevels, {
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/**
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* Constant: MIN_ZOOM_LEVEL
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* {Integer} 0
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*/
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MIN_ZOOM_LEVEL: 0,
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/**
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* Constant: MAX_ZOOM_LEVEL
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* {Integer} 19
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*/
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MAX_ZOOM_LEVEL: 19,
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/**
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* Constant: RESOLUTIONS
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* {Array(Float)} 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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RESOLUTIONS: [
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1.40625,
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0.703125,
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0.3515625,
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0.17578125,
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0.087890625,
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0.0439453125,
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0.02197265625,
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0.010986328125,
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0.0054931640625,
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0.00274658203125,
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0.001373291015625,
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0.0006866455078125,
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0.00034332275390625,
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0.000171661376953125,
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0.0000858306884765625,
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0.00004291534423828125,
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0.00002145767211914062,
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0.00001072883605957031,
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0.00000536441802978515,
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0.00000268220901489257
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],
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/**
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* APIProperty: type
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* {GMapType}
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*/
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type: null,
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/**
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* APIProperty: sphericalMercator
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* {Boolean} Should the map act as a mercator-projected map? This will
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* cause all interactions with the map to be in the actual map
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* projection, which allows support for vector drawing, overlaying
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* other maps, etc.
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*/
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sphericalMercator: false,
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/**
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* Constructor: OpenLayers.Layer.Google
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*
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* Parameters:
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* name - {String} A name for the layer.
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* options - {Object} An optional object whose properties will be set
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* on the layer.
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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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if (this.sphericalMercator) {
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OpenLayers.Util.extend(this, OpenLayers.Layer.SphericalMercator);
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this.initMercatorParameters();
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}
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},
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/**
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* Method: loadMapObject
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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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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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//can we do smooth panning? (some versions don't)
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if ( !this.mapObject.G || !this.mapObject.G.qb ||
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(typeof this.mapObject.G.qb != "function") ) {
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this.dragPanMapObject = null;
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}
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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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/**
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* APIMethod: setMap
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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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* Parameters:
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* map - {<OpenLayers.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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/**
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* Method: setMapType
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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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setMapType: function() {
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if (this.mapObject.getCenter() != null) {
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// Support for custom map types.
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if (OpenLayers.Util.indexOf(this.mapObject.getMapTypes(),
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this.type) == -1) {
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this.mapObject.addMapType(this.type);
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}
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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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* APIMethod: onMapResize
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*
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* Parameters:
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* evt - {Event}
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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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* APIMethod: getZoomForExtent
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*
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* Parameters:
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* bounds - {<OpenLayers.Bounds>}
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*
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* Returns:
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* {Integer} 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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*
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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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* APIMethod: getOLBoundsFromMapObjectBounds
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*
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* Parameters:
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* moBounds - {Object}
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*
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* Returns:
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* {<OpenLayers.Bounds>} An <OpenLayers.Bounds>, translated from the
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* passed-in MapObject Bounds.
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* Returns null if null value is passed in.
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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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if (this.sphericalMercator) {
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sw = this.forwardMercator(sw.lng(), sw.lat());
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ne = this.forwardMercator(ne.lng(), ne.lat());
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} else {
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sw = new OpenLayers.LonLat(sw.lng(), sw.lat());
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ne = new OpenLayers.LonLat(ne.lng(), ne.lat());
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}
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olBounds = new OpenLayers.Bounds(sw.lon,
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sw.lat,
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ne.lon,
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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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* 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 GLatLngBounds(new GLatLng(sw.lat, sw.lon),
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new GLatLng(ne.lat, ne.lon));
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}
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return moBounds;
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},
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/**
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* Method: addContainerPxFunction
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* Hack-on function because GMAPS does not give it to us
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*
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* Parameters:
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* gLatLng - {GLatLng}
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*
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* Returns:
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* {GPoint} A GPoint specifying gLatLng translated into "Container" coords
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*/
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addContainerPxFunction: function() {
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if ( (typeof GMap2 != "undefined") &&
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!GMap2.prototype.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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var div = this.getContainer().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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* APIMethod: getWarningHTML
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*
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* Returns:
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* {String} String with information on why layer is broken, how to get
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* it working.
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*/
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getWarningHTML:function() {
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return OpenLayers.i18n("googleWarning");
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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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/**
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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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this.mapObject.setCenter(center, zoom);
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},
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/**
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* APIMethod: dragPanMapObject
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*
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* Parameters:
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* dX - {Integer}
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* dY - {Integer}
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*/
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dragPanMapObject: function(dX, dY) {
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var newX = this.mapObject.G.left - dX;
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var newY = this.mapObject.G.top + dY;
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this.mapObject.G.qb(newX, newY);
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},
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/**
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* APIMethod: getMapObjectCenter
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*
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* Returns:
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* {Object} The mapObject's current center in Map Object format
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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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* APIMethod: getMapObjectZoom
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*
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* Returns:
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* {Integer} The mapObject's current zoom, in Map Object format
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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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* 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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return this.mapObject.fromContainerPixelToLatLng(moPixel);
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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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return this.mapObject.fromLatLngToContainerPixel(moLonLat);
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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: getLongitudeFromMapObjectLonLat
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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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* {Float} Longitude of the given MapObject LonLat
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*/
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getLongitudeFromMapObjectLonLat: function(moLonLat) {
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return this.sphericalMercator ?
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this.forwardMercator(moLonLat.lng(), moLonLat.lat()).lon :
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moLonLat.lng();
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},
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/**
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* APIMethod: getLatitudeFromMapObjectLonLat
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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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* {Float} Latitude of the given MapObject LonLat
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*/
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getLatitudeFromMapObjectLonLat: function(moLonLat) {
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var lat = this.sphericalMercator ?
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this.forwardMercator(moLonLat.lng(), moLonLat.lat()).lat :
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moLonLat.lat();
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return lat;
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},
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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 GLatLng(lonlat.lat, lonlat.lon);
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} else {
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gLatLng = new GLatLng(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: getXFromMapObjectPixel
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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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* {Integer} X value of the MapObject Pixel
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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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* APIMethod: getYFromMapObjectPixel
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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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* {Integer} Y value of the MapObject Pixel
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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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* 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 GPoint(x, y);
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},
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CLASS_NAME: "OpenLayers.Layer.Google"
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});
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