#600: d.vect: add new size_column=, rotation_column= options
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Reporter: hamish | Owner: grass-dev@lists.osgeo.org
Type: enhancement | Status: new
Priority: normal | Milestone: 6.5.0
Component: Vector | Version: svn-develbranch6
Keywords: d.vect | Platform: All
Cpu: All |
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Hi,
it would be nice if d.vect had two new options for display of
points/icons: size_column= and rotation_column=.
I think to do it we'd just have to clone the code from the existing
rgb_column=, wcolumn= options, then: (as in d.graph)
{{{
- S_stroke(Symb, size, 0.0, 0);
+ S_stroke(Symb, size, double rotation, 0);
}}}
angle is measured in degrees CCW from East.
we'd have to verify that cats with NULL attributes for rotation angle use
rotation=0.0 and not just whatever the angle of the last cat was. I guess
that the wcolumn= option already has code to check that the given column
is numeric.
workaround using d.graph:
{{{
#spearfish dataset
#create example values using the cat number for angle
# rotation is measured in degrees CCW from East
g.copy vect=archsites,test_rotate
v.db.addcol test_rotate column='rotation double precision'
v.db.update test_rotate column=rotation value='CAT'
v.out.ascii test_rotate column=rotation | \
awk -F'|' '{printf("rotation %s\nsymbol geology/strike_triangle 12 %s
%s black black\n", $4, $1, $2)}' \
> test_rotate_graph.rules
d.graph -m test_rotate_graph.rules
d.vect test_rotate disp=cat yref=top
}}}
thanks,
Hamish
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Ticket URL: <https://trac.osgeo.org/grass/ticket/600>
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