[GRASS-dev] [GRASS GIS] #3014: Add ticks to continuous raster legend

[GRASS GIS]

#3014: Add ticks to continuous raster legend
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  Reporter:  annakrat     |      Owner:  grass-dev@…
      Type:  enhancement  |     Status:  new
  Priority:  normal       |  Milestone:  7.3.0
 Component:  Display      |    Version:  svn-trunk
Resolution:               |   Keywords:  d.legend, gsoc2016, cartography
       CPU:  Unspecified  |   Platform:  All
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Comment (by annakrat):

 Thanks, I tested it and it works very well. I have couple of suggestions:

 * if you compare the default before and after this change, the white
 border is now transparent, so that should be changed back. Also if you
 test categorical data, the black/white border is switched (inner is black,
 should be white). The current default legend size is wider than the
 previous one, that should be fixed as well.

 * drawing ticks should be optional, implement for example '-t' flag.
 Question is if it should draw the ticks by default or not. Let's switch
 them off by default for now.

 * the vertical centering of the labels and ticks is not quite perfect, I
 wonder if it could be improved

 * I thought more about the names of the new parameters and decided
 `label_values` and `label_step` would fit more to `labelnum`

 * the `-c` flag should always hide all the numbers, it is actually useful
 mostly with categorical data

 * I think when option `label_value` or `label_step` is used, `labelnum`
 should be ignored. So the min max values won't be displayed. I hope we
 could get some feedback from other users what kind of behavior would be
 more natural.

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Ticket URL: <https://trac.osgeo.org/grass/ticket/3014#comment:4>
GRASS GIS <https://grass.osgeo.org>