Hello, I want do add an arrow *tip* to a line with the same angle.
I have tried this:
from pylab import *
from matplotlib import collections, transforms
def MyArrow(ax, x, y, ang, scale=50, over=.5, color='k'):
ar = [(0,0), (-.5,-over), (0,1), (.5,-over), (0,0)]
col = collections.PolyCollection(
[ar],
offsets=(x, y),
transOffset=ax.transData,
color=color
)
col.set_transform(transforms.Affine2D().rotate(ang).scale(scale))
ax.add_collection(col)
plot([0,1,2], '.-', lw=2)
MyArrow(gca(), .5, .5, -pi/4)
draw()
and I get an arrow tip without the same line angle :-( See the attached
image.
Can you help me to get the right transformation?
Thanks,
Friedrich
<<attachment: arrow.png>>
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