psxy -Sm plots inside-out arrowheads for end angles close to 180 degrees
|Target version:||Candidate for next bugfix release|
Using the math angle option of psxy with an arrowhead for angles close to 180 degrees results in one of the sides of the arrowhead to be plotted as a large (near?-)circular curve going around the origin of the angle vector, instead of the very short curve needed to close the arrowhead.
Here is example code:
echo 0 0 1 0 175 | gmt psxy -R-4/4/-4/4 -JX5c/5c -Sm0.2c+e+p++g-+r -W1.5p,red -Gblue -Bxa1 -Bya1 > test.ps