[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):

 Replying to [comment:1 lazaa]:
 > Currently legend has ticks in regular intervals depend on
 {{{labelnum}}}. The aim is to add option e.g. {{{steps=100}}} for display
 label every hundred or {{{labels_at=[list of values]}}} to add one or more
 labels at specific values? (value would have to be min < label_at < max)

 Start with drawing the tick marks based on `labelnum`. You should probably
 center the label at the tick.

 If we want to further complicate it, there is couple of options. For
 example, we could have a parameter `tick_value` (or something similar)
 where user would specify values where to plot the ticks and labels.

 Another option is to add `tick_step` which would create ticks based on the
 step. But the `tick_start` may be needed to know where to draw the first
 one.

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Ticket URL: <https://trac.osgeo.org/grass/ticket/3014#comment:2>
GRASS GIS <https://grass.osgeo.org>