[mapguide-trac] #1986: Stylization: allow retrieving visibility information

[MapGuide Open Source]

#1986: Stylization: allow retrieving visibility information
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   Reporter:  danstoica    |       Owner:       
       Type:  enhancement  |      Status:  new  
   Priority:  low          |   Milestone:       
  Component:  General      |     Version:  2.1.0
   Severity:  trivial      |    Keywords:       
External_id:               |  
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 Let's assume a layer has range styles or thematic rules. The Default
 Stylizer checks these constrains for feature and may decide not to draw.
 The issue is on the client side because these rules are owned by the
 Stylizer and the client needs a way to filter out the invisible features.

 The solution is to expose these rules. The proposal is to add 2 public new
 methods on the Default Stylizer class:

 // Returns true if a valid range was found. Returns false otherwise.
 virtual bool HasValidScaleRange
 (MdfModel::VectorLayerDefinition* layer, double mapScale);

 // Returns a Filter containing the combined thematic rules.
 // Returns NULL in case there are no rules.
 virtual FdoFilter * GetRulesFilter(MdfModel::VectorLayerDefinition* layer,
 double mapScale);

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Ticket URL: <http://trac.osgeo.org/mapguide/ticket/1986>
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