[OpenLayers-Users] Info on Google Maps Terrain layer (G_PHYSICAL_MAP)

[Arnd Wippermann]

Hi Dave,

great patch. I have applied the patch and tested with Google Maps Version
2.93. It seems to work.

MfG
Arnd Wippermann
http://gis.ibbeck.de/ginfo/



overstdr wrote:
> 
> 
> Christopher Schmidt-4 wrote:
>> 
>> On Wed, Dec 12, 2007 at 11:03:34PM +0100, Arnd Wippermann wrote:
>>> Hi,
>>> 
>>> Google Maps have a new layer
>>> (http://googlemapsapi.blogspot.com/2007/12/v294-terrain-and-new-maptypecontr
>>> ol-to.html). With API 2.93 you can request a terrain layer. Looks quite
>>> good. I have tested it with OpenLayers. But now with API 2.93 the
>>> flickering
>>> while panning is returned.
>> 
>> Yep. There is no API method for what we abuse the Google Maps API to do,
>> so we're tied to the version of Google Maps that I was able to find
>> already reverse engineered -- specifically, the version used by MapBuzz.
>> 
>> It would be nice if Google could provide a method to do what we
>> currently hack, or something providing similar functionality: 
>> 
>> http://trac.openlayers.org/browser/trunk/openlayers/lib/OpenLayers/Layer/Google.js#L346
>> 
>> Until then, we're going to be stuck with the single version of the
>> Google Maps API.
>> 
>> Regards,
>> -- 
>> Christopher Schmidt
>> MetaCarta
>> _______________________________________________
>> Users mailing list
>> Users at openlayers.org
>> http://openlayers.org/mailman/listinfo/users
>> 
>> 
> 
> 
> Hi,
> 
> I think I have found another "hack" that solves the flickering panning
> problem with v 2.93...below are the changes I have made to
> OpenLayers.Layer.Google.js:
> 
> Line 123:
>             //can we do smooth panning? (some versions don't) (overstdr:
> modified to handle 2.93)
>             if ( !this.mapObject.G || (!this.mapObject.G.qb &&
> !this.mapObject.G.vb) ||
>                  (typeof this.mapObject.G.qb != "function" && typeof
> this.mapObject.G.vb != "function")) {
>                 this.dragPanMapObject = null;
>             }
>     
> LINE 358:
> dragPanMapObject: function(dX, dY) {
>         var newX = this.mapObject.G.left - dX;
>         var newY = this.mapObject.G.top + dY;
>         if(this.mapObject.G.qb) {
>         	this.mapObject.G.qb(newX, newY);
>         } else if(this.mapObject.G.vb) {
>         	this.mapObject.G.vb(newX, newY);
>         }
>     }
> 
> As you can see the main change I made was just to check if G.vb exists
> instead of G.qb...it appears 2.93 uses .vb rather than .qb...Definately
> test before using...i still need to apply to become a developer for
> OpenLayers, so I havent posted this ticket/fix to CVS.
> 
> Regards,
> 
> Dave Overstrom
> Terra Solutions Group, LLC
> 

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