OpenLayers.Layer.Google

Provides a wrapper for Google’s Maps API Normally the Terms of Use for this API do not allow wrapping, but Google have provided written consent to OpenLayers for this - see email in http://osgeo-org.1560.n6.nabble.com/Google-Maps-API-Terms-of-Use-changes-tp4910013p4911981.html

Inherits from

Summary
OpenLayers.Layer.GoogleProvides a wrapper for Google’s Maps API Normally the Terms of Use for this API do not allow wrapping, but Google have provided written consent to OpenLayers for this - see email in http://osgeo-org.1560.n6.nabble.com/Google-Maps-API-Terms-of-Use-changes-tp4910013p4911981.html
Constants
MIN_ZOOM_LEVEL{Integer} 0
MAX_ZOOM_LEVEL{Integer} 21
RESOLUTIONS{Array(Float)} Hardcode these resolutions so that they are more closely tied with the standard wms projection
Properties
type{GMapType}
wrapDateLine{Boolean} Allow user to pan forever east/west.
sphericalMercator{Boolean} Should the map act as a mercator-projected map? 
useTiltImages{Boolean} Should Google use 45° (tilt) imagery when available or should it stick to the 0° overhead view? 
version{Number} The version of the Google Maps API
Constructor
OpenLayers.Layer.Google
Functions
cloneCreate a clone of this layer
setVisibilitySet the visibility flag for the layer and hide/show & redraw accordingly.
displayHide or show the Layer
moveTo
setOpacitySets the opacity for the entire layer (all images)
destroyClean up this layer.
removeGMapElementsRemove all elements added to the dom.
removeMapOn being removed from the map, also remove termsOfUse and poweredBy divs
getOLBoundsFromMapObjectBounds
getWarningHTML{String} String with information on why layer is broken, how to get it working.
getMapObjectCenter{Object} The mapObject’s current center in Map Object format
getMapObjectZoom{Integer} The mapObject’s current zoom, in Map Object format
getLongitudeFromMapObjectLonLat
getLatitudeFromMapObjectLonLat
getXFromMapObjectPixel
getYFromMapObjectPixel
Properties
OpenLayers.Layer.Google.cache{Object} Cache for elements that should only be created once per map.

Constants

MIN_ZOOM_LEVEL

{Integer} 0

MAX_ZOOM_LEVEL

{Integer} 21

RESOLUTIONS

{Array(Float)} Hardcode these resolutions so that they are more closely tied with the standard wms projection

Properties

type

{GMapType}

wrapDateLine

{Boolean} Allow user to pan forever east/west.  Default is true.  Setting this to false only restricts panning if sphericalMercator is true.

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.

useTiltImages

{Boolean} Should Google use 45° (tilt) imagery when available or should it stick to the 0° overhead view?  While tilt images look impressive, the changed viewing angle can cause the misalignment of overlay layers.

version

{Number} The version of the Google Maps API

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.

Functions

clone

clone: function()

Create a clone of this layer

Returns

{OpenLayers.Layer.Google} An exact clone of this layer

setVisibility

setVisibility: function(visible)

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)

display

display: function(visible)

Hide or show the Layer

Parameters

visible{Boolean}

moveTo

moveTo: function(bounds,
zoomChanged,
dragging)

Parameters

bounds{OpenLayers.Bounds}
zoomChanged{Boolean} Tells when zoom has changed, as layers have to do some init work in that case.
dragging{Boolean}

setOpacity

setOpacity: function(opacity)

Sets the opacity for the entire layer (all images)

Parameters

opacity{Float}

destroy

destroy: function()

Clean up this layer.

removeGMapElements

removeGMapElements: function()

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.

removeMap

removeMap: function(map)

On being removed from the map, also remove termsOfUse and poweredBy divs

Parameters

map{OpenLayers.Map}

getOLBoundsFromMapObjectBounds

getOLBoundsFromMapObjectBounds: function(moBounds)

Parameters

moBounds{Object}

Returns

{OpenLayers.Bounds} An OpenLayers.Bounds, translated from the passed-in MapObject Bounds.  Returns null if null value is passed in.

getWarningHTML

getWarningHTML:function()

Returns

{String} String with information on why layer is broken, how to get it working.

getMapObjectCenter

getMapObjectCenter: function()

Returns

{Object} The mapObject’s current center in Map Object format

getMapObjectZoom

getMapObjectZoom: function()

Returns

{Integer} The mapObject’s current zoom, in Map Object format

getLongitudeFromMapObjectLonLat

getLongitudeFromMapObjectLonLat: function(moLonLat)

Parameters

moLonLat{Object} MapObject LonLat format

Returns

{Float} Longitude of the given MapObject LonLat

getLatitudeFromMapObjectLonLat

getLatitudeFromMapObjectLonLat: function(moLonLat)

Parameters

moLonLat{Object} MapObject LonLat format

Returns

{Float} Latitude of the given MapObject LonLat

getXFromMapObjectPixel

getXFromMapObjectPixel: function(moPixel)

Parameters

moPixel{Object} MapObject Pixel format

Returns

{Integer} X value of the MapObject Pixel

getYFromMapObjectPixel

getYFromMapObjectPixel: function(moPixel)

Parameters

moPixel{Object} MapObject Pixel format

Returns

{Integer} Y value of the MapObject Pixel

Properties

OpenLayers.Layer.Google.cache

{Object} Cache for elements that should only be created once per map.

clone: function()
Create a clone of this layer
setVisibility: function(visible)
Set the visibility flag for the layer and hide/show & redraw accordingly.
display: function(visible)
Hide or show the Layer
moveTo: function(bounds,
zoomChanged,
dragging)
setOpacity: function(opacity)
Sets the opacity for the entire layer (all images)
destroy: function()
Clean up this layer.
removeGMapElements: function()
Remove all elements added to the dom.
removeMap: function(map)
On being removed from the map, also remove termsOfUse and poweredBy divs
getOLBoundsFromMapObjectBounds: function(moBounds)
getWarningHTML:function()
{String} String with information on why layer is broken, how to get it working.
getMapObjectCenter: function()
{Object} The mapObject’s current center in Map Object format
getMapObjectZoom: function()
{Integer} The mapObject’s current zoom, in Map Object format
getLongitudeFromMapObjectLonLat: function(moLonLat)
getLatitudeFromMapObjectLonLat: function(moLonLat)
getXFromMapObjectPixel: function(moPixel)
getYFromMapObjectPixel: function(moPixel)
A mixin for layers that wraps up the pieces necessary to have a coordinate conversion for working with commercial APIs which use a spherical mercator projection.
Base class for 3rd party layers, providing a DOM element which isolates the 3rd-party layer from mouse events.
Some Layers will already have established zoom levels (like google or ve).
{Boolean} Should the map act as a mercator-projected map? 
Instances of this class represent bounding boxes.
Instances of OpenLayers.Map are interactive maps embedded in a web page.
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