[mapguide-trac] #351: Annotation of Linear Features

[MapGuide Open Source]

#351: Annotation of Linear Features
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   Reporter:  TonyB              |       Owner:                          
       Type:  enhancement        |      Status:  new                     
   Priority:  medium             |   Milestone:                          
  Component:  Rendering Service  |     Version:  1.2.0                   
   Severity:  minor              |    Keywords:  label, lines, annotation
External_id:                     |  
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 Overall, MGO annotation is great, with some smart placement algorithms.
 But one of those, annotation across multiple linear segments, does get
 messy in certain situations.

 Some examples (see attached images):

 1. Here it works well by splitting a street name over two adjacent
 segments (for lack of space)

 2. But here the algorithm prefers traversing two segments over placing the
 text separately on each segment as it has to the right.

 3. And again here, the algorithm favours multiple segments (using a little
 “traffic circle” in the middle of two large segments)

 Suggested resolution: calculate the mean angular orientation of adjacent
 segments, and if it is greater than a predefined minimum (20 or 30
 degrees?), do NOT annotate across their common node.

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Ticket URL: <http://trac.osgeo.org/mapguide/ticket/351>
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