Add zoomOffset to Google Layer

[landry]

Followup to  http://trac.osgeo.org/openlayers/ticket/2616, that'd be nice to have a similar feature for Google Layers, ie allowing one to use a map with a smaller maxExtent (ie not the whole world) and being able to display only a subset of Google layers.

As of now, if i have a map with numZoomLevels=12 and maxResolution=2445.9849046875, when i add a google layer the zoom level on it is wrong, while it could be 'fixed' by adding zoomOffset.

[ahocevar]

You can do this already with OpenLayers.Layer.GoogleNG. Please try it out, and close this ticket if your issue is resolved. http://openlayers.org/dev/examples/google-ng.html and http://openlayers.org/dev/examples/bing-tiles-restrictedzoom.html. A combination of the two should get you there.

[landry]

Oh, awesome. I can't really use/try it atm as i'm more or less constrained to ol 2.10, but sure it fixes the issue since XYZ supports zoomOffset and GoogleNG inherits from it.