[fusion-trac] #113: Can't zoom out beyond initial map view

[Fusion]

#113: Can't zoom out beyond initial map view
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 Reporter:  andrewd   |         Owner:  madair
     Type:  defect    |        Status:  new   
 Priority:  P2        |     Milestone:  2.0   
Component:  Core      |       Version:  SVN   
 Severity:  Critical  |    Resolution:        
 Keywords:            |   External_id:        
    State:  New       |       Browser:  All   
       Os:  All       |  
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Changes (by pagameba):

  * milestone:  1.1 => 2.0

Comment:

 As far as I understand, there are two places where you can specify an
 extent related to the map (ignoring for the moment that you can also set
 predefined scales):

  * In the map definition, you can set an initial view
  * In the application definition (flexible layout), you can choose to use
 the map's initial view OR set a custom view.

 There is nowhere to specify what the maximum extent of the data or map
 view is.  I suppose that we could determine a maximum scale from
 inspecting the scale range of the layers in the map (these are already
 processed per layer for legend purposes).

 We have had requests to support the concept of a maximum extent for the
 map (so users can't pan beyond a certain point) which also translates into
 a maximum scale for zooming out and I think this makes sense.  The way we
 chose to implement this was to use the initial view in the Map definition
 as the maximum extent of the map and the custom view in the flexible
 layout/application definition as the starting point.  This allows the same
 map definition to have different starting points for different
 applications, which is fairly flexible but can require a bit more
 configuration.

 Perhaps a reasonable compromise would be to have a setting in the
 ApplicationDefinition that would allow you to choose to have a limited
 extent based on the map's initial view.  This wouldn't be supported in
 Studio obviously, but perhaps we could convince Kenneth to put it in
 Maestro :)

 We should also look at employing the layer's scale ranges for determining
 the maximum scale for zooming.

 This is too much work for 1.1.

-- 
Ticket URL: <http://trac.osgeo.org/fusion/ticket/113#comment:11>
Fusion <http://trac.osgeo.org/fusion>
Fusion is a web-mapping application development framework for MapServer and MapGuide OS.