afeb15b3e7
git-svn-id: http://svn.openlayers.org/trunk/openlayers@832 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf
361 lines
9.9 KiB
JavaScript
361 lines
9.9 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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// load Google map control script
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// this key was generated for: http://openlayers.python-hosting.com/testing/euzuro/
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document.write("<script src='http://maps.google.com/maps?file=api&v=2&key=ABQIAAAAmQ3udCHPQVB_9T_edFZ7YRRRlP-tOiFgaSzksg_0w1dphL9c5BTfdJMKT91b0UJGibNcWEM0Q5-O1w'></script>");
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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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* @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 always a base class.
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* @type Boolean
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*/
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isBaseLayer: function() {
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return true;
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},
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/**
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* @param {OpenLayers.Bounds} bounds
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* @param {Boolean} zoomChanged
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*/
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moveTo:function(bounds, zoomChanged) {
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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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/**
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*
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*/
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loadGMap:function() {
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// create div and set to same size as map
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var gDiv = OpenLayers.Util.createDiv(this.name);
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var sz = this.map.getSize();
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gDiv.style.width = sz.w;
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gDiv.style.height = sz.h;
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this.div.appendChild(gDiv);
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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 the events fall through
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// the gmaps div and into the main layer div
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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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},
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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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/**
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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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* @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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* @type OpenLayers.LonLat
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*/
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getLonLatFromViewPortPx: function (viewPortPx) {
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var gPoint = this.getGPointFromOLPixel(viewPortPx);
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var gLatLng = this.gmap.fromDivPixelToLatLng(gPoint)
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return this.getOLLonLatFromGLatLng(gLatLng);
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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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* @type OpenLayers.Pixel
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*/
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getViewPortPxFromLonLat: function (lonlat) {
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var gLatLng = this.getGLatLngFromOLLonLat(lonlat);
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var gPoint = this.gmap.fromLatLngToDivPixel(gLatLng)
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return this.getOLPixelFromGPoint(gPoint);
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},
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/**
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* @param {OpenLayers.Bounds} bounds
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*
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* @return {int}
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*/
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getZoomForExtent: function (bounds) {
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var gBounds = this.getGLatLngBoundsFromOLBounds(bounds);
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var gZoom = this.gmap.getBoundsZoomLevel(gBounds);
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return this.getOLZoomFromGZoom(gZoom);
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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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* @type OpenLayers.Bounds
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*/
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getExtent: function () {
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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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return this.getOLBoundsFromGLatLngBounds(gLatLngBounds);
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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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* @type int
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*/
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getOLZoomFromGZoom: function(gZoom) {
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return (gZoom - 1);
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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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* @type int
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*/
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getGZoomFromOLZoom: function(olZoom) {
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return (olZoom + 1);
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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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* @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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* @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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* @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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* @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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* @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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* @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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});
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