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Date: Fri, 30 Nov 90 15:26+0100
From: firstname.lastname@example.org (Hans Nieters)
The call of draw-polygon does not produce visible output in case of thickness 1
for skew lines in genera-8
(graphics::draw-polygon '(100 100 100 200 300 200 200 100) :thickness 1 :filled nil)
Since it works for genera 7, i am surprised. Can it be repaired?
Use :thickness 0, which in the new graphics substrate of Genera 8 is the
'device minimum' rather than 'exact' thickness. Using thickness 1 is supposed
to give you exactly displayed lines, which may not be possible at all angles.
My theory about why thickness 1 'shouldn't' work: If you assume square pixels,
then the width of a non-vertical or horizontal line is greater than the
horizontal or vertical width of a pixel; for a 45 degree angle line, the width
of the line might be interpreted as (sqrt 2) pixels.
- From: email@example.com (Hans Nieters)