629e62b82b
git-svn-id: http://svn.openlayers.org/trunk/openlayers@949 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf
492 lines
15 KiB
JavaScript
492 lines
15 KiB
JavaScript
/* Copyright (c) 2006 MetaCarta, Inc., published under the BSD license.
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* See http://svn.openlayers.org/trunk/openlayers/license.txt for the full
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* text of the license. */
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// @require: OpenLayers/Layer.js
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if (typeof GMap2 != "undefined") {
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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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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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* @class
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*/
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OpenLayers.Layer.Google = Class.create();
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OpenLayers.Layer.Google.prototype = Object.extend( new OpenLayers.Layer(), {
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/** @type Boolean */
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isFixed: true,
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/** @type GMap2 gmap stores the Google Map element */
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gmap:null,
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/** @type Boolean */
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dragging:false,
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// OPTIONS
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/** @type int */
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minZoomLevel: -1,
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/** @type int */
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maxZoomLevel: 16,
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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.prototype.initialize.apply(this, arguments);
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if (this.maxExtent == null) {
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this.maxExtent = new OpenLayers.Bounds(-180, -90, 180, 90);
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}
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},
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/**
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*
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*/
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destroy: function() {
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this.gmap = null;
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OpenLayers.Layer.prototype.destroy.apply(this, arguments);
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},
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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.prototype.setMap.apply(this, arguments);
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// once our layer has been added to the map, we can create the vemap
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this.map.events.register("addlayer", this, this.loadGMap);
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},
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/** Google layer is a base class if the GMap loaded correctly.
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* @type Boolean
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*/
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isBaseLayer: function() {
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return (this.gmap != null);
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},
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/** Assuming we are not dragging (in which case GMaps moving itself)
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* we need to move the gmap to the new center/zoom
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*
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* @param {OpenLayers.Bounds} bounds
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* @param {Boolean} zoomChanged
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* @param {Boolean} minor
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*/
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moveTo:function(bounds, zoomChanged, minor) {
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if ((this.gmap != null) && (!this.dragging)) {
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var newCenter = this.map.getCenter();
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var newZoom = this.map.getZoom();
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if (newCenter != null) {
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var gCenter = this.gmap.getCenter();
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var gZoom = this.gmap.getZoom();
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var currentCenter = this.getOLLonLatFromGLatLng(gCenter);
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var currentZoom = this.getOLZoomFromGZoom(gZoom);
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if ( (!newCenter.equals(currentCenter)) ||
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(newZoom != currentZoom) ) {
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this.gmap.setCenter(this.getGLatLngFromOLLonLat(newCenter),
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this.getGZoomFromOLZoom(newZoom));
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}
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}
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}
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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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*/
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loadGMap: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.gmap = new GMap2(this.div);
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// this causes the GMap to set itself to Map's center/zoom
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this.moveTo();
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// catch pans and zooms from GMap
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GEvent.addListener(this.gmap,
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"moveend",
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this.catchPanZoom.bindAsEventListener(this));
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// attach to the drag start and end and we<77>ll set a flag so that
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// we dont get recursivity. this is because when we call setCenter(),
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// it calls moveTo() on all layers
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GEvent.addListener(this.gmap,
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"dragstart",
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this.dragStart.bindAsEventListener(this));
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GEvent.addListener(this.gmap,
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"dragend",
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this.dragEnd.bindAsEventListener(this));
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// catch pans and zooms from GMap
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GEvent.addListener(this.gmap,
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"drag",
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this.catchPanZoom.bindAsEventListener(this));
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} catch (e) {
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this.loadWarningMessage();
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}
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},
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/** If we can't load the GMap, then display an error message to the
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* user and tell them where to go for help.
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*
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* @private
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*
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*/
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loadWarningMessage:function() {
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this.div.style.backgroundColor = "red";
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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, click on the Google Layer's "
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html += "tab 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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var viewSize = this.map.getSize();
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msgW = Math.min(viewSize.w, 300);
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msgH = Math.min(viewSize.h, 200);
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var size = new OpenLayers.Size(msgW, msgH);
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var centerPx = new OpenLayers.Pixel(viewSize.w/2, viewSize.h/2);
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var topLeft = centerPx.add(-size.w/2, -size.h/2);
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var div = OpenLayers.Util.createDiv("gmapsWarning",
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topLeft,
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size,
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null,
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null,
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null,
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"auto");
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div.style.padding = "7px";
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div.style.backgroundColor = "yellow";
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div.innerHTML = html;
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this.div.appendChild(div);
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},
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/**
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* @private
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*/
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dragStart: function() {
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this.dragging = true;
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},
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/**
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* @private
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*/
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dragEnd: function() {
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this.dragging = false;
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},
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/** When GMap recenters itself (when user doubleclicks or draggs it) we
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* need to update our Map -- and all the other layers
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*
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* @private
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*
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* @param {event} e
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*/
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catchPanZoom: function(e) {
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var gCenter = this.gmap.getCenter();
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var gZoom = this.gmap.getZoom();
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var olCenter = this.getOLLonLatFromGLatLng(gCenter);
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var olZoom = this.getOLZoomFromGZoom(gZoom);
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this.map.setCenter(olCenter, olZoom);
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},
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/********************************************************/
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/* */
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/* Baselayer Functions */
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/* */
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/********************************************************/
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/**
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* @param {OpenLayers.Pixel} viewPortPx
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*
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* @returns An OpenLayers.LonLat which is the passed-in view port
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* OpenLayers.Pixel, translated into lon/lat by GMAPS
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* If gmap is not loaded or not centered, returns null
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* @type OpenLayers.LonLat
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*/
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getLonLatFromViewPortPx: function (viewPortPx) {
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var lonlat = null;
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if ((this.gmap != null) && (this.gmap.getCenter() != null)) {
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var gPoint = this.getGPointFromOLPixel(viewPortPx);
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var gLatLng = this.gmap.fromContainerPixelToLatLng(gPoint)
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lonlat = this.getOLLonLatFromGLatLng(gLatLng);
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}
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return lonlat;
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},
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/**
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* @param {OpenLayers.LonLat} lonlat
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*
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* @returns An OpenLayers.Pixel which is the passed-in OpenLayers.LonLat,
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* translated into view port pixels BY GMAPS
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* If gmap is not loaded or not centered, returns null
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* @type OpenLayers.Pixel
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*/
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getViewPortPxFromLonLat: function (lonlat) {
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var viewPortPx = null;
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if ((this.gmap != null) && (this.gmap.getCenter() != null)) {
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var gLatLng = this.getGLatLngFromOLLonLat(lonlat);
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// note we use special hacked function here
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var gPoint = this.gmap.fromLatLngToContainerPixel(gLatLng);
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viewPortPx = this.getOLPixelFromGPoint(gPoint);
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}
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return viewPortPx;
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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 gmap 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.gmap != null) && (this.gmap.getCenter() != null)) {
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var gBounds = this.getGLatLngBoundsFromOLBounds(bounds);
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var gZoom = this.gmap.getBoundsZoomLevel(gBounds);
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zoom = this.getOLZoomFromGZoom(gZoom);
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}
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return zoom;
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},
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/**
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* @returns A Bounds object which represents the lon/lat bounds of the
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* current viewPort.
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* If gmap is not loaded, returns null
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* @type OpenLayers.Bounds
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*/
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getExtent: function () {
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var extent = null;
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if (this.gmap != null) {
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if (this.gmap.getCenter() == null) {
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this.moveTo();
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}
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var gLatLngBounds = this.gmap.getBounds();
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extent = this.getOLBoundsFromGLatLngBounds(gLatLngBounds);
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}
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return extent;
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},
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/********************************************************/
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/* */
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/* Translation Functions */
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/* */
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/* The following functions translate GMaps and OL */
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/* formats for Pixel, LonLat, Bounds, and Zoom */
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/* */
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/********************************************************/
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//
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// TRANSLATION: GZoom <-> OpenLayers Zoom
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//
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/**
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* @param {int} gZoom
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*
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* @returns An OpenLayers Zoom level, translated from the passed in gZoom
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* Returns null if null value is passed in
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* @type int
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*/
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getOLZoomFromGZoom: function(gZoom) {
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var zoom = null;
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if (gZoom != null) {
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zoom = gZoom - 1;
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}
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return zoom;
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},
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/**
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* @param {int} olZoom
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*
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* @returns A GZoom level, translated from the passed in olZoom
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* Returns null if null value is passed in
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* @type int
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*/
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getGZoomFromOLZoom: function(olZoom) {
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var zoom = null;
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if (olZoom != null) {
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zoom = olZoom + 1;
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}
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return zoom;
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},
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//
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// TRANSLATION: GLatLng <-> LonLat
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//
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/**
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* @param {GLatLng} gLatLng
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*
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* @returns An OpenLayers.LonLat, translated from the passed in GLatLng
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* Returns null if null value is passed in
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* @type OpenLayers.LonLat
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*/
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getOLLonLatFromGLatLng: function(gLatLng) {
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var olLonLat = null;
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if (gLatLng != null) {
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olLonLat = new OpenLayers.LonLat(gLatLng.lng(), gLatLng.lat());
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}
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return olLonLat;
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},
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/**
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* @param {OpenLayers.LonLat} olLonLat
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*
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* @returns A GLatLng, translated from the passed in OpenLayers.LonLat
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* Returns null if null value is passed in
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* @type GLatLng
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*/
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getGLatLngFromOLLonLat: function(olLonLat) {
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var gLatLng = null;
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if (olLonLat != null) {
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gLatLng = new GLatLng(olLonLat.lat, olLonLat.lon);
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}
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return gLatLng;
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},
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//
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// TRANSLATION: GPoint <-> OpenLayers.Pixel
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//
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/**
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* @param {GPoint} gPoint
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*
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* @returns An OpenLayers.Pixel, translated from the passed in GPoint
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* Returns null if null value is passed in
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* @type OpenLayers.Pixel
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*/
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getOLPixelFromGPoint: function(gPoint) {
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var olPixel = null;
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if (gPoint != null) {
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olPixel = new OpenLayers.Pixel(gPoint.x, gPoint.y);
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}
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return olPixel;
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},
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/**
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* @param {OpenLayers.Pixel} olPixel
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*
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* @returns A GPoint, translated from the passed in OpenLayers.Pixel
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* Returns null if null value is passed in
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* @type GPoint
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*/
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getGPointFromOLPixel: function(olPixel) {
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var gPoint = null;
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if (olPixel != null) {
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gPoint = new GPoint(olPixel.x, olPixel.y);
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}
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return gPoint;
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},
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//
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// TRANSLATION: GLatLngBounds <-> OpenLayers.Bounds
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//
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/**
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* @param {GLatLngBounds} gLatLngBounds
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*
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* @returns An OpenLayers.Bounds, translated from gLatLngBounds
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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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getOLBoundsFromGLatLngBounds: function(gLatLngBounds) {
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var olBounds = null;
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if (gLatLngBounds != null) {
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var sw = gLatLngBounds.getSouthWest();
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var ne = gLatLngBounds.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 GLatLngBounds, translated from olBounds
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* Returns null if null value is passed in
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* @type GLatLngBounds
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*/
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getGLatLngBoundsFromOLBounds: function(olBounds) {
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var gLatLngBounds = 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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gLatLngBounds = new GLatLngBounds(sw, ne);
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}
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return gLatLngBounds;
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},
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/** @final @type String */
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CLASS_NAME: "OpenLayers.Layer.Google"
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}); |