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| Viewing file: Select action/file-type: /* Copyright (c) 2006-2010 by OpenLayers Contributors (see authors.txt for
* full list of contributors). Published under the Clear BSD license.
* See http://svn.openlayers.org/trunk/openlayers/license.txt for the
* full text of the license. */
/**
* @requires OpenLayers/Layer/SphericalMercator.js
* @requires OpenLayers/Layer/EventPane.js
* @requires OpenLayers/Layer/FixedZoomLevels.js
*/
/**
* Class: OpenLayers.Layer.Google
*
* Inherits from:
* - <OpenLayers.Layer.SphericalMercator>
* - <OpenLayers.Layer.EventPane>
* - <OpenLayers.Layer.FixedZoomLevels>
*/
OpenLayers.Layer.Google = OpenLayers.Class(
OpenLayers.Layer.EventPane,
OpenLayers.Layer.FixedZoomLevels, {
/**
* Constant: MIN_ZOOM_LEVEL
* {Integer} 0
*/
MIN_ZOOM_LEVEL: 0,
/**
* Constant: MAX_ZOOM_LEVEL
* {Integer} 21
*/
MAX_ZOOM_LEVEL: 21,
/**
* Constant: RESOLUTIONS
* {Array(Float)} Hardcode these resolutions so that they are more closely
* tied with the standard wms projection
*/
RESOLUTIONS: [
1.40625,
0.703125,
0.3515625,
0.17578125,
0.087890625,
0.0439453125,
0.02197265625,
0.010986328125,
0.0054931640625,
0.00274658203125,
0.001373291015625,
0.0006866455078125,
0.00034332275390625,
0.000171661376953125,
0.0000858306884765625,
0.00004291534423828125,
0.00002145767211914062,
0.00001072883605957031,
0.00000536441802978515,
0.00000268220901489257,
0.0000013411045074462891,
0.00000067055225372314453
],
/**
* APIProperty: type
* {GMapType}
*/
type: null,
/**
* APIProperty: wrapDateLine
* {Boolean} Allow user to pan forever east/west. Default is true.
* Setting this to false only restricts panning if
* <sphericalMercator> is true.
*/
wrapDateLine: true,
/**
* APIProperty: sphericalMercator
* {Boolean} Should the map act as a mercator-projected map? This will
* cause all interactions with the map to be in the actual map
* projection, which allows support for vector drawing, overlaying
* other maps, etc.
*/
sphericalMercator: false,
/**
* Property: version
* {Number} The version of the Google Maps API
*/
version: null,
/**
* Constructor: OpenLayers.Layer.Google
*
* Parameters:
* name - {String} A name for the layer.
* options - {Object} An optional object whose properties will be set
* on the layer.
*/
initialize: function(name, options) {
options = options || {};
if(!options.version) {
options.version = typeof GMap2 === "function" ? "2" : "3";
}
var mixin = OpenLayers.Layer.Google["v" +
options.version.replace(/\./g, "_")];
if (mixin) {
OpenLayers.Util.applyDefaults(options, mixin);
} else {
throw "Unsupported Google Maps API version: " + options.version;
}
OpenLayers.Util.applyDefaults(options, mixin.DEFAULTS);
if (options.maxExtent) {
options.maxExtent = options.maxExtent.clone();
}
OpenLayers.Layer.EventPane.prototype.initialize.apply(this,
[name, options]);
OpenLayers.Layer.FixedZoomLevels.prototype.initialize.apply(this,
[name, options]);
if (this.sphericalMercator) {
OpenLayers.Util.extend(this, OpenLayers.Layer.SphericalMercator);
this.initMercatorParameters();
}
},
/**
* Method: clone
* Create a clone of this layer
*
* Returns:
* {<OpenLayers.Layer.Google>} An exact clone of this layer
*/
clone: function() {
/**
* This method isn't intended to be called by a subclass and it
* doesn't call the same method on the superclass. We don't call
* the super's clone because we don't want properties that are set
* on this layer after initialize (i.e. this.mapObject etc.).
*/
return new OpenLayers.Layer.Google(
this.name, this.getOptions()
);
},
/**
* APIMethod: setVisibility
* Set the visibility flag for the layer and hide/show & redraw
* accordingly. Fire event unless otherwise specified
*
* Note that visibility is no longer simply whether or not the layer's
* style.display is set to "block". Now we store a 'visibility' state
* property on the layer class, this allows us to remember whether or
* not we *desire* for a layer to be visible. In the case where the
* map's resolution is out of the layer's range, this desire may be
* subverted.
*
* Parameters:
* visible - {Boolean} Display the layer (if in range)
*/
setVisibility: function(visible) {
// sharing a map container, opacity has to be set per layer
var opacity = this.opacity == null ? 1 : this.opacity;
OpenLayers.Layer.EventPane.prototype.setVisibility.apply(this, arguments);
this.setOpacity(opacity);
},
/**
* APIMethod: display
* Hide or show the Layer
*
* Parameters:
* display - {Boolean}
*/
display: function(visible) {
if (!this._dragging) {
this.setGMapVisibility(visible);
}
OpenLayers.Layer.EventPane.prototype.display.apply(this, arguments);
},
/**
* Method: moveTo
*
* Parameters:
* bound - {<OpenLayers.Bounds>}
* zoomChanged - {Boolean} Tells when zoom has changed, as layers have to
* do some init work in that case.
* dragging - {Boolean}
*/
moveTo: function(bounds, zoomChanged, dragging) {
this._dragging = dragging;
OpenLayers.Layer.EventPane.prototype.moveTo.apply(this, arguments);
delete this._dragging;
},
/**
* APIMethod: setOpacity
* Sets the opacity for the entire layer (all images)
*
* Parameter:
* opacity - {Float}
*/
setOpacity: function(opacity) {
if (opacity !== this.opacity) {
if (this.map != null) {
this.map.events.triggerEvent("changelayer", {
layer: this,
property: "opacity"
});
}
this.opacity = opacity;
}
// Though this layer's opacity may not change, we're sharing a container
// and need to update the opacity for the entire container.
if (this.getVisibility()) {
var container = this.getMapContainer();
OpenLayers.Util.modifyDOMElement(
container, null, null, null, null, null, null, opacity
);
}
},
/**
* APIMethod: destroy
* Clean up this layer.
*/
destroy: function() {
/**
* We have to override this method because the event pane destroy
* deletes the mapObject reference before removing this layer from
* the map.
*/
if (this.map) {
this.setGMapVisibility(false);
var cache = OpenLayers.Layer.Google.cache[this.map.id];
if (cache && cache.count <= 1) {
this.removeGMapElements();
}
}
OpenLayers.Layer.EventPane.prototype.destroy.apply(this, arguments);
},
/**
* Method: removeGMapElements
* Remove all elements added to the dom. This should only be called if
* this is the last of the Google layers for the given map.
*/
removeGMapElements: function() {
var cache = OpenLayers.Layer.Google.cache[this.map.id];
if (cache) {
// remove shared elements from dom
var container = this.mapObject && this.getMapContainer();
if (container && container.parentNode) {
container.parentNode.removeChild(container);
}
var termsOfUse = cache.termsOfUse;
if (termsOfUse && termsOfUse.parentNode) {
termsOfUse.parentNode.removeChild(termsOfUse);
}
var poweredBy = cache.poweredBy;
if (poweredBy && poweredBy.parentNode) {
poweredBy.parentNode.removeChild(poweredBy);
}
}
},
/**
* APIMethod: removeMap
* On being removed from the map, also remove termsOfUse and poweredBy divs
*
* Parameters:
* map - {<OpenLayers.Map>}
*/
removeMap: function(map) {
// hide layer before removing
if (this.visibility && this.mapObject) {
this.setGMapVisibility(false);
}
// check to see if last Google layer in this map
var cache = OpenLayers.Layer.Google.cache[map.id];
if (cache) {
if (cache.count <= 1) {
this.removeGMapElements();
delete OpenLayers.Layer.Google.cache[map.id];
} else {
// decrement the layer count
--cache.count;
}
}
// remove references to gmap elements
delete this.termsOfUse;
delete this.poweredBy;
delete this.mapObject;
delete this.dragObject;
OpenLayers.Layer.EventPane.prototype.removeMap.apply(this, arguments);
},
//
// TRANSLATION: MapObject Bounds <-> OpenLayers.Bounds
//
/**
* APIMethod: getOLBoundsFromMapObjectBounds
*
* Parameters:
* moBounds - {Object}
*
* Returns:
* {<OpenLayers.Bounds>} An <OpenLayers.Bounds>, translated from the
* passed-in MapObject Bounds.
* Returns null if null value is passed in.
*/
getOLBoundsFromMapObjectBounds: function(moBounds) {
var olBounds = null;
if (moBounds != null) {
var sw = moBounds.getSouthWest();
var ne = moBounds.getNorthEast();
if (this.sphericalMercator) {
sw = this.forwardMercator(sw.lng(), sw.lat());
ne = this.forwardMercator(ne.lng(), ne.lat());
} else {
sw = new OpenLayers.LonLat(sw.lng(), sw.lat());
ne = new OpenLayers.LonLat(ne.lng(), ne.lat());
}
olBounds = new OpenLayers.Bounds(sw.lon,
sw.lat,
ne.lon,
ne.lat );
}
return olBounds;
},
/**
* APIMethod: getWarningHTML
*
* Returns:
* {String} String with information on why layer is broken, how to get
* it working.
*/
getWarningHTML:function() {
return OpenLayers.i18n("googleWarning");
},
/************************************
* *
* MapObject Interface Controls *
* *
************************************/
// Get&Set Center, Zoom
/**
* 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();
},
/************************************
* *
* 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;
},
// 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;
},
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 = {};
/**
* Constant: OpenLayers.Layer.Google.v2
*
* Mixin providing functionality specific to the Google Maps API v2.
*/
OpenLayers.Layer.Google.v2 = {
/**
* Property: termsOfUse
* {DOMElement} Div for Google's copyright and terms of use link
*/
termsOfUse: null,
/**
* Property: poweredBy
* {DOMElement} Div for Google's powered by logo and link
*/
poweredBy: null,
/**
* Property: dragObject
* {GDraggableObject} Since 2.93, Google has exposed the ability to get
* the maps GDraggableObject. We can now use this for smooth panning
*/
dragObject: null,
/**
* Method: loadMapObject
* Load the GMap and register appropriate event listeners. If we can't
* load GMap2, then display a warning message.
*/
loadMapObject:function() {
if (!this.type) {
this.type = G_NORMAL_MAP;
}
var mapObject, termsOfUse, poweredBy;
var cache = OpenLayers.Layer.Google.cache[this.map.id];
if (cache) {
// there are already Google layers added to this map
mapObject = cache.mapObject;
termsOfUse = cache.termsOfUse;
poweredBy = cache.poweredBy;
// increment the layer count
++cache.count;
} else {
// this is the first Google layer for this map
var container = this.map.viewPortDiv;
var div = document.createElement("div");
div.id = this.map.id + "_GMap2Container";
div.style.position = "absolute";
div.style.width = "100%";
div.style.height = "100%";
container.appendChild(div);
// create GMap and shuffle elements
try {
mapObject = new GMap2(div);
// move the ToS and branding stuff up to the container div
termsOfUse = div.lastChild;
container.appendChild(termsOfUse);
termsOfUse.style.zIndex = "1100";
termsOfUse.style.right = "";
termsOfUse.style.bottom = "";
termsOfUse.className = "olLayerGoogleCopyright";
poweredBy = div.lastChild;
container.appendChild(poweredBy);
poweredBy.style.zIndex = "1100";
poweredBy.style.right = "";
poweredBy.style.bottom = "";
poweredBy.className = "olLayerGooglePoweredBy gmnoprint";
} catch (e) {
throw(e);
}
// cache elements for use by any other google layers added to
// this same map
OpenLayers.Layer.Google.cache[this.map.id] = {
mapObject: mapObject,
termsOfUse: termsOfUse,
poweredBy: poweredBy,
count: 1
};
}
this.mapObject = mapObject;
this.termsOfUse = termsOfUse;
this.poweredBy = poweredBy;
// ensure this layer type is one of the mapObject types
if (OpenLayers.Util.indexOf(this.mapObject.getMapTypes(),
this.type) === -1) {
this.mapObject.addMapType(this.type);
}
//since v 2.93 getDragObject is now available.
if(typeof mapObject.getDragObject == "function") {
this.dragObject = mapObject.getDragObject();
} else {
this.dragPanMapObject = null;
}
if(this.isBaseLayer === false) {
this.setGMapVisibility(this.div.style.display !== "none");
}
},
/**
* APIMethod: onMapResize
*/
onMapResize: function() {
// workaround for resizing of invisible or not yet fully loaded layers
// where GMap2.checkResize() does not work. We need to load the GMap
// for the old div size, then checkResize(), and then call
// layer.moveTo() to trigger GMap.setCenter() (which will finish
// the GMap initialization).
if(this.visibility && this.mapObject.isLoaded()) {
this.mapObject.checkResize();
} else {
if(!this._resized) {
var layer = this;
var handle = GEvent.addListener(this.mapObject, "load", function() {
GEvent.removeListener(handle);
delete layer._resized;
layer.mapObject.checkResize();
layer.moveTo(layer.map.getCenter(), layer.map.getZoom());
});
}
this._resized = true;
}
},
/**
* Method: setGMapVisibility
* Display the GMap container and associated elements.
*
* Parameters:
* visible - {Boolean} Display the GMap elements.
*/
setGMapVisibility: function(visible) {
var cache = OpenLayers.Layer.Google.cache[this.map.id];
if (cache) {
var container = this.mapObject.getContainer();
if (visible === true) {
this.mapObject.setMapType(this.type);
container.style.display = "";
this.termsOfUse.style.left = "";
this.termsOfUse.style.display = "";
this.poweredBy.style.display = "";
cache.displayed = this.id;
} else {
if (cache.displayed === this.id) {
delete cache.displayed;
}
if (!cache.displayed) {
container.style.display = "none";
this.termsOfUse.style.display = "none";
// move ToU far to the left in addition to setting display
// to "none", because at the end of the GMap2 load
// sequence, display: none will be unset and ToU would be
// visible after loading a map with a google layer that is
// initially hidden.
this.termsOfUse.style.left = "-9999px";
this.poweredBy.style.display = "none";
}
}
}
},
/**
* Method: getMapContainer
*
* Returns:
* {DOMElement} the GMap container's div
*/
getMapContainer: function() {
return this.mapObject.getContainer();
},
//
// TRANSLATION: MapObject Bounds <-> OpenLayers.Bounds
//
/**
* APIMethod: getMapObjectBoundsFromOLBounds
*
* Parameters:
* olBounds - {<OpenLayers.Bounds>}
*
* Returns:
* {Object} A MapObject Bounds, translated from olBounds
* Returns null if null value is passed in
*/
getMapObjectBoundsFromOLBounds: function(olBounds) {
var moBounds = null;
if (olBounds != null) {
var sw = this.sphericalMercator ?
this.inverseMercator(olBounds.bottom, olBounds.left) :
new OpenLayers.LonLat(olBounds.bottom, olBounds.left);
var ne = this.sphericalMercator ?
this.inverseMercator(olBounds.top, olBounds.right) :
new OpenLayers.LonLat(olBounds.top, olBounds.right);
moBounds = new GLatLngBounds(new GLatLng(sw.lat, sw.lon),
new GLatLng(ne.lat, ne.lon));
}
return moBounds;
},
/************************************
* *
* 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));
},
// 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: 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: getMapObjectPixelFromXY
*
* Parameters:
* x - {Integer}
* y - {Integer}
*
* Returns:
* {Object} MapObject Pixel from x and y parameters
*/
getMapObjectPixelFromXY: function(x, y) {
return new GPoint(x, y);
}
};
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