[mapguide-trac] #401: Fix AdvancedPlacement handling

[MapGuide Open Source]

#401: Fix AdvancedPlacement handling
------------------------------+---------------------------------------------
   Reporter:  waltweltonlair  |       Owner:  waltweltonlair
       Type:  defect          |      Status:  new           
   Priority:  high            |   Milestone:                
  Component:  General         |     Version:                
   Severity:  minor           |    Keywords:                
External_id:  1036670         |  
------------------------------+---------------------------------------------
 The !LayerDefinition schema supports an !AdvancedPlacement element on
 !TextSymbol.  This element determines whether labels are positioned using
 an advanced placement algorithm.  In particular, it determines if labels
 on polylines follow the contour of the polyline.

 In prior versions of !MapGuide this element has never been persisted, even
 though the default behavior was to enable the advanced placement algorithm
 for polyline labels.  Going forward we want to start using this element to
 control whether advanced placement occurs, while at the same time allow
 legacy maps to draw unchanged.

 Old maps are missing the !AdvancedPlacement element, and therefore the
 lack of this element implies the advanced placement option be enabled by
 default.  This was already fixed in changeset 2681.  In order to specify
 that a map not use advanced placement, we will tweak the behavior of the
 !ScaleLimit subelement.  If this element is 0.0 or less then advanced
 placement is off.  If greater than 0.0 then advanced placement is on.  We
 must update !MdfParser to always save the !AdvancedPlacement / !ScaleLimit
 elements.

-- 
Ticket URL: <https://trac.osgeo.org/mapguide/ticket/401>
MapGuide Open Source <http://mapguide.osgeo.org/>
MapGuide Open Source Internals