On 14/09/15 15:53, Vaclav Petras wrote:
Hi,
is there some documentation on how to use the display library, i.e. how
to write a d.* module?
I imagine you looked at
https://grass.osgeo.org/programming7/displaylib.html ?
I've tried reading d.vect code but I miss the
general rules and concepts like how to set color or which coordinates
Have you checked display_shape() in shape.c and the individual display_*
functions in the relevant files (area.c, line.c) for the different types
of features ?
The color is set with D_RGB_color which takes a color struct as input.
Then the feature is drawn with
D_polygon_abs/D_polyline_abs/D_polydots_abs which take the coordinates
from the line struct Points which is filled with info using
Vect_read_line().
should be used when as well as information which functions should be
used in which case like what is the difference between D_symbol and
D_symbol2.
From the programmer's manual section on D_Symbol2:
"The same as D_symbol(), but it uses a primary and secondary color
instead of line and fill color. "
Moritz
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