bada3d98a1
git-svn-id: http://svn.openlayers.org/branches/openlayers/2.9@10175 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf
749 lines
23 KiB
JavaScript
749 lines
23 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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* @requires OpenLayers/Console.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} 21
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*/
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MAX_ZOOM_LEVEL: 21,
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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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0.0000013411045074462891,
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0.00000067055225372314453
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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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* Property: dragObject
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* {GDraggableObject} Since 2.93, Google has exposed the ability to get
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* the maps GDraggableObject. We can now use this for smooth panning
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*/
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dragObject: null,
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/**
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* Property: termsOfUse
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* {DOMElement} Div for Google's copyright and terms of use link
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*/
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termsOfUse: null,
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/**
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* Property: poweredBy
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* {DOMElement} Div for Google's powered by logo and link
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*/
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poweredBy: null,
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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: clone
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* Create a clone of this layer
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*
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* Returns:
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* {<OpenLayers.Layer.Google>} An exact clone of this layer
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*/
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clone: function() {
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/**
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* This method isn't intended to be called by a subclass and it
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* doesn't call the same method on the superclass. We don't call
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* the super's clone because we don't want properties that are set
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* on this layer after initialize (i.e. this.mapObject etc.).
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*/
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return new OpenLayers.Layer.Google(
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this.name, this.getOptions()
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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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if (!this.type) {
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this.type = G_NORMAL_MAP;
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}
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var mapObject, termsOfUse, poweredBy;
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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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termsOfUse = cache.termsOfUse;
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poweredBy = cache.poweredBy;
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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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var container = this.map.viewPortDiv;
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var div = document.createElement("div");
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div.id = this.map.id + "_GMap2Container";
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div.style.position = "absolute";
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div.style.width = "100%";
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div.style.height = "100%";
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container.appendChild(div);
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// create GMap and shuffle elements
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try {
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mapObject = new GMap2(div);
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// move the ToS and branding stuff up to the container div
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termsOfUse = div.lastChild;
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container.appendChild(termsOfUse);
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termsOfUse.style.zIndex = "1100";
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termsOfUse.style.right = "";
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termsOfUse.style.bottom = "";
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termsOfUse.className = "olLayerGoogleCopyright";
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poweredBy = div.lastChild;
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container.appendChild(poweredBy);
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poweredBy.style.zIndex = "1100";
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poweredBy.style.right = "";
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poweredBy.style.bottom = "";
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poweredBy.className = "olLayerGooglePoweredBy gmnoprint";
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} catch (e) {
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OpenLayers.Console.error(e);
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return;
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}
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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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OpenLayers.Layer.Google.cache[this.map.id] = {
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mapObject: mapObject,
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termsOfUse: termsOfUse,
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poweredBy: poweredBy,
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count: 1
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};
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}
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this.mapObject = mapObject;
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this.termsOfUse = termsOfUse;
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this.poweredBy = poweredBy;
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// ensure this layer type is one of the mapObject 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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//since v 2.93 getDragObject is now available.
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if(typeof mapObject.getDragObject == "function") {
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this.dragObject = mapObject.getDragObject();
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} else {
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this.dragPanMapObject = null;
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}
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if(this.isBaseLayer === false) {
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this.setGMapVisibility(this.div.style.display !== "none");
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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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onMapResize: function() {
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// workaround for resizing of invisible or not yet fully loaded layers
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// where GMap2.checkResize() does not work. We need to load the GMap
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// for the old div size, then checkResize(), and then call
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// layer.moveTo() to trigger GMap.setCenter() (which will finish
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// the GMap initialization).
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if(this.visibility && this.mapObject.isLoaded()) {
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this.mapObject.checkResize();
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} else {
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if(!this._resized) {
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var layer = this;
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var handle = GEvent.addListener(this.mapObject, "load", function() {
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GEvent.removeListener(handle);
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delete layer._resized;
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layer.mapObject.checkResize();
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layer.moveTo(layer.map.getCenter(), layer.map.getZoom());
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});
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}
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this._resized = true;
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}
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},
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/**
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* APIMethod: setVisibility
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* Set the visibility flag for the layer and hide/show & redraw
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* accordingly. Fire event unless otherwise specified
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*
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* Note that visibility is no longer simply whether or not the layer's
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* style.display is set to "block". Now we store a 'visibility' state
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* property on the layer class, this allows us to remember whether or
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* not we *desire* for a layer to be visible. In the case where the
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* map's resolution is out of the layer's range, this desire may be
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* subverted.
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*
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* Parameters:
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* visible - {Boolean} Display the layer (if in range)
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*/
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setVisibility: function(visible) {
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this.setGMapVisibility(visible);
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// sharing a map container, opacity has to be set per layer
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var opacity = this.opacity == null ? 1 : this.opacity;
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OpenLayers.Layer.EventPane.prototype.setVisibility.apply(this, arguments);
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this.setOpacity(opacity);
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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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if (cache) {
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var container = this.mapObject.getContainer();
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if (visible === true) {
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this.mapObject.setMapType(this.type);
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container.style.display = "";
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this.termsOfUse.style.left = "";
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this.termsOfUse.style.display = "";
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this.poweredBy.style.display = "";
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cache.displayed = this.id;
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} else {
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if (cache.displayed === this.id) {
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delete cache.displayed;
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}
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if (!cache.displayed) {
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container.style.display = "none";
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this.termsOfUse.style.display = "none";
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// move ToU far to the left in addition to setting display
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// to "none", because at the end of the GMap2 load
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// sequence, display: none will be unset and ToU would be
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// visible after loading a map with a google layer that is
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// initially hidden.
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this.termsOfUse.style.left = "-9999px";
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this.poweredBy.style.display = "none";
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}
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}
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}
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},
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/**
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* APIMethod: setOpacity
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* Sets the opacity for the entire layer (all images)
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*
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* Parameter:
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* opacity - {Float}
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*/
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setOpacity: function(opacity) {
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if (opacity !== this.opacity) {
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if (this.map != null) {
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this.map.events.triggerEvent("changelayer", {
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layer: this,
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property: "opacity"
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});
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}
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this.opacity = opacity;
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}
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// Though this layer's opacity may not change, we're sharing a container
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// and need to update the opacity for the entire container.
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if (this.getVisibility()) {
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var container = this.mapObject.getContainer();
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OpenLayers.Util.modifyDOMElement(
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container, null, null, null, null, null, null, opacity
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);
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}
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},
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/**
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* APIMethod: destroy
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* Clean up this layer.
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*/
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destroy: function() {
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/**
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* We have to override this method because the event pane destroy
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* deletes the mapObject reference before removing this layer from
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* the map.
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*/
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if (this.map) {
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this.setGMapVisibility(false);
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var cache = OpenLayers.Layer.Google.cache[this.map.id];
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if (cache && cache.count <= 1) {
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this.removeGMapElements(false);
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}
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}
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OpenLayers.Layer.EventPane.prototype.destroy.apply(this, arguments);
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},
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/**
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* Method: removeGMapElements
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* Remove all elements added to the dom. This should only be called if
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* this is the last of the Google layers for the given map.
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*/
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removeGMapElements: function() {
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var cache = OpenLayers.Layer.Google.cache[this.map.id];
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if (cache) {
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// remove shared elements from dom
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var container = this.mapObject && this.mapObject.getContainer();
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if (container && container.parentNode) {
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container.parentNode.removeChild(container);
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}
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var termsOfUse = cache.termsOfUse;
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if (termsOfUse && termsOfUse.parentNode) {
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termsOfUse.parentNode.removeChild(termsOfUse);
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}
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var poweredBy = cache.poweredBy;
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if (poweredBy && poweredBy.parentNode) {
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poweredBy.parentNode.removeChild(poweredBy);
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}
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}
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},
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/**
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* APIMethod: removeMap
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* On being removed from the map, also remove termsOfUse and poweredBy divs
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*
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* Parameters:
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* map - {<OpenLayers.Map>}
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*/
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removeMap: function(map) {
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// hide layer before removing
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if (this.visibility && this.mapObject) {
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this.setGMapVisibility(false);
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}
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// check to see if last Google layer in this map
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var cache = OpenLayers.Layer.Google.cache[map.id];
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if (cache) {
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if (cache.count <= 1) {
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this.removeGMapElements();
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delete OpenLayers.Layer.Google.cache[map.id];
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} else {
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// decrement the layer count
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--cache.count;
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}
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}
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// remove references to gmap elements
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delete this.termsOfUse;
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delete this.poweredBy;
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delete this.mapObject;
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delete this.dragObject;
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OpenLayers.Layer.EventPane.prototype.removeMap.apply(this, arguments);
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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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*/
|
|
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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|
*
|
|
* Returns:
|
|
* {String} String with information on why layer is broken, how to get
|
|
* it working.
|
|
*/
|
|
getWarningHTML:function() {
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|
return OpenLayers.i18n("googleWarning");
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|
},
|
|
|
|
|
|
/************************************
|
|
* *
|
|
* MapObject Interface Controls *
|
|
* *
|
|
************************************/
|
|
|
|
|
|
// Get&Set Center, Zoom
|
|
|
|
/**
|
|
* 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) {
|
|
this.mapObject.setCenter(center, zoom);
|
|
},
|
|
|
|
/**
|
|
* APIMethod: dragPanMapObject
|
|
*
|
|
* Parameters:
|
|
* dX - {Integer}
|
|
* dY - {Integer}
|
|
*/
|
|
dragPanMapObject: function(dX, dY) {
|
|
this.dragObject.moveBy(new GSize(-dX, dY));
|
|
},
|
|
|
|
/**
|
|
* APIMethod: getMapObjectCenter
|
|
*
|
|
* Returns:
|
|
* {Object} The mapObject's current center in Map Object format
|
|
*/
|
|
getMapObjectCenter: function() {
|
|
return this.mapObject.getCenter();
|
|
},
|
|
|
|
/**
|
|
* APIMethod: getMapObjectZoom
|
|
*
|
|
* Returns:
|
|
* {Integer} The mapObject's current zoom, in Map Object format
|
|
*/
|
|
getMapObjectZoom: function() {
|
|
return this.mapObject.getZoom();
|
|
},
|
|
|
|
|
|
// LonLat - Pixel Translation
|
|
|
|
/**
|
|
* APIMethod: getMapObjectLonLatFromMapObjectPixel
|
|
*
|
|
* Parameters:
|
|
* moPixel - {Object} MapObject Pixel format
|
|
*
|
|
* Returns:
|
|
* {Object} MapObject LonLat translated from MapObject Pixel
|
|
*/
|
|
getMapObjectLonLatFromMapObjectPixel: function(moPixel) {
|
|
return this.mapObject.fromContainerPixelToLatLng(moPixel);
|
|
},
|
|
|
|
/**
|
|
* APIMethod: getMapObjectPixelFromMapObjectLonLat
|
|
*
|
|
* Parameters:
|
|
* moLonLat - {Object} MapObject LonLat format
|
|
*
|
|
* Returns:
|
|
* {Object} MapObject Pixel transtlated from MapObject LonLat
|
|
*/
|
|
getMapObjectPixelFromMapObjectLonLat: function(moLonLat) {
|
|
return this.mapObject.fromLatLngToContainerPixel(moLonLat);
|
|
},
|
|
|
|
|
|
// 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: getLongitudeFromMapObjectLonLat
|
|
*
|
|
* Parameters:
|
|
* moLonLat - {Object} MapObject LonLat format
|
|
*
|
|
* Returns:
|
|
* {Float} Longitude of the given MapObject LonLat
|
|
*/
|
|
getLongitudeFromMapObjectLonLat: function(moLonLat) {
|
|
return this.sphericalMercator ?
|
|
this.forwardMercator(moLonLat.lng(), moLonLat.lat()).lon :
|
|
moLonLat.lng();
|
|
},
|
|
|
|
/**
|
|
* APIMethod: getLatitudeFromMapObjectLonLat
|
|
*
|
|
* Parameters:
|
|
* moLonLat - {Object} MapObject LonLat format
|
|
*
|
|
* Returns:
|
|
* {Float} Latitude of the given MapObject LonLat
|
|
*/
|
|
getLatitudeFromMapObjectLonLat: function(moLonLat) {
|
|
var lat = this.sphericalMercator ?
|
|
this.forwardMercator(moLonLat.lng(), moLonLat.lat()).lat :
|
|
moLonLat.lat();
|
|
return lat;
|
|
},
|
|
|
|
/**
|
|
* 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 GLatLng(lonlat.lat, lonlat.lon);
|
|
} else {
|
|
gLatLng = new GLatLng(lat, lon);
|
|
}
|
|
return gLatLng;
|
|
},
|
|
|
|
// Pixel
|
|
|
|
/**
|
|
* APIMethod: getXFromMapObjectPixel
|
|
*
|
|
* Parameters:
|
|
* moPixel - {Object} MapObject Pixel format
|
|
*
|
|
* Returns:
|
|
* {Integer} X value of the MapObject Pixel
|
|
*/
|
|
getXFromMapObjectPixel: function(moPixel) {
|
|
return moPixel.x;
|
|
},
|
|
|
|
/**
|
|
* APIMethod: getYFromMapObjectPixel
|
|
*
|
|
* Parameters:
|
|
* moPixel - {Object} MapObject Pixel format
|
|
*
|
|
* Returns:
|
|
* {Integer} Y value of the MapObject Pixel
|
|
*/
|
|
getYFromMapObjectPixel: function(moPixel) {
|
|
return moPixel.y;
|
|
},
|
|
|
|
/**
|
|
* APIMethod: getMapObjectPixelFromXY
|
|
*
|
|
* Parameters:
|
|
* x - {Integer}
|
|
* y - {Integer}
|
|
*
|
|
* Returns:
|
|
* {Object} MapObject Pixel from x and y parameters
|
|
*/
|
|
getMapObjectPixelFromXY: function(x, y) {
|
|
return new GPoint(x, y);
|
|
},
|
|
|
|
CLASS_NAME: "OpenLayers.Layer.Google"
|
|
});
|
|
|
|
/**
|
|
* Property: OpenLayers.Layer.Google.cache
|
|
* {Object} Cache for elements that should only be created once per map.
|
|
*/
|
|
OpenLayers.Layer.Google.cache = {};
|