[fusion-trac] #486: Base map layers show in wrong places working with Bing Maps

[Fusion]

#486: Base map layers show in wrong places working with Bing Maps
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   Reporter:  christinebao  |       Owner:  madair  
       Type:  defect        |      Status:  assigned
   Priority:  P2            |   Milestone:  2.3     
  Component:  MapGuide      |     Version:  2.0     
   Severity:  Critical      |    Keywords:          
External_id:  1432080       |       State:  New     
    Browser:  All           |          Os:  All     
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Comment(by jng):

 Attached is a patch to make fusion check if a given
 OpenLayers.Layer.MapGuide object has a scale list equivalent to the Google
 Layer Scale list, if so it tacks on a bUsesCommercialLayerScaleList
 property to indicate this.

 The basemap switcher widget has been modified to include a list of offsets
 to apply based on the given layer selected. When a commerical layer
 switches, any OpenLayers.Layer.MapGuide objects whose
 bUsesCommercialLayerScaleList flag is set will have their zoomOffset set
 to the associated offset in this list.

 This makes the given map line up correctly for all supported base layers.
 I could not confirm Yahoo map support due to lack of API key.

 This patch is not 100% perfect, there is some minor visual artifacts as a
 layer gets switched, there may be excessive redraw() calls as part of
 initialising the basemap switcher. But it produces the intended results:
 your MG tiled layers lining up with your MG untiled layers and the
 commerical layer if (and only if) your tiled maps are using the Google
 Commerical Layer scale list

 Please review (especially if this changes also work with Yahoo layers)

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Ticket URL: <http://trac.osgeo.org/fusion/ticket/486#comment:26>
Fusion <http://trac.osgeo.org/fusion>
Fusion is a web-mapping application development framework for MapServer and MapGuide OS.