[GRASS-dev] [GRASS GIS] #2143: d.legend: add option to output legend definition as text

[GRASS GIS]

#2143: d.legend: add option to output legend definition as text
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 Reporter:  wenzeslaus             |       Owner:  grass-dev@…              
     Type:  enhancement            |      Status:  new                      
 Priority:  trivial                |   Milestone:  7.0.0                    
Component:  Display                |     Version:  svn-trunk                
 Keywords:  d.legend, text output  |    Platform:  All                      
      Cpu:  All                    |  
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Comment(by wenzeslaus):

 Replying to [comment:1 hamish]:
 >
 > see r.colors.out (which does most of you are asking for in this ticket I
 think) and the approach taken by various grass6 addon modules:
 r.colors.out_sld (Mapserver), r.colors.out_vtk (Paraview/VisIt), r.out.gmt
 (also creates the GMT color table), and r.out.gdal.
 >
 > .. or for something local/custom just parse the $MAPSET/colr/ file
 directly.
 >
 I was not testing these but it seems to me that I would end up in re-
 implementing `d.legend`, e.g. when putting there labels or when forcing
 other types of legend than the map would use by default.

 > I haven't looked at it in a while, but I imagine the HTML display driver
 might have some web-friendly code in it too?
 >
 Last time when I was testing HTML driver I got the impression that it
 supports only HTML tag map and that even this is not finished. Probably
 the big issue is what HTML driver is supposed to do anyway? Legend
 rendered as what in HTML and how this fits together with HTML tag map. But
 this is different topic.

 > Do you have specific plans on how you'd use the output? or is this more
 a general idea?
 >
 The motivation was the ability to create legend for HTML pages, or
 alternatively LaTeX reports. But the idea is general, e.g. font and
 generally handling of labels could be important for any output which is
 trying to be something more than an raster image.

 > As the primary author of the current d.legend I'm not exactly
 enthusiastic about messing too much with what is already working well.
 It's a complicated monolith, and I'd appreciate anyone thinking about
 changing it to please contact me first for advice. (or the change will
 risk be dropped like the fontscale option soon will be)
 >
 Adding there text output is actually trying to avoid the need for bigger
 changes in `d.legend` (some super visualizations can be then done
 outside).

 ''The other things are related to wiki:GSoC/2014, so they should be
 discussed at mailing list, or the ideas should be updated directly when it
 is clear.''

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Ticket URL: <http://trac.osgeo.org/grass/ticket/2143#comment:3>
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