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[Bug]: Capstyle has no effect on FancyArrow #22340

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mapfiable opened this issue Jan 28, 2022 · 5 comments
Closed

[Bug]: Capstyle has no effect on FancyArrow #22340

mapfiable opened this issue Jan 28, 2022 · 5 comments
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status: needs clarification Issues that need more information to resolve.

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@mapfiable
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Bug summary

I was trying to create a FancyArrow with a butt, but changing the capstyle has no effect. I guess this is related to #13641?

Code for reproduction

import matplotlib.pyplot as plt
from matplotlib.patches import FancyArrow


fig, ax = plt.subplots()
for i, cs in enumerate(['butt', 'round', 'projecting']):
    arrow = FancyArrow(0, 0+i, 1, 0, width=0.1, capstyle=cs)
    ax.add_patch(arrow)

ax.relim()
ax.autoscale_view()
fig.show()

Actual outcome

grafik

Expected outcome

Something similar to this:

grafik

Additional information

No response

Operating system

No response

Matplotlib Version

3.5.1

Matplotlib Backend

No response

Python version

No response

Jupyter version

No response

Installation

pip
@jklymak
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jklymak commented Jan 28, 2022

I'm confused - there are no caps in the arrow patches, so where would you expect those styles to have effect?

@jklymak jklymak added the status: needs clarification Issues that need more information to resolve. label Jan 28, 2022
@mapfiable
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Ooh, ok. But then what is the non-pointy end of the arrow called? I thought that's the cap. But I guess in that case I missunderstood the kwarg. What is it supposed to do instead then / in what case does it have an effect? Also, does that mean I cannot get a FancyArrow with a round butt?

@jklymak
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jklymak commented Jan 28, 2022

Fancy Arrow is a patch, and the lines outlining the patch are what have a cap style and join style. Those do not affect the shape of the patch. I don't see that FancyArrow allows different tail shapes, and the head shapes are restricted to width and length. So if you want a different shape, you will have to make a PolygonPatch and pass the path yourself.

@mapfiable
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Ah, ok, I get it now, sorry. I also found this FancyArrow demo, but it never had anything to do with FancyArrows, did it? The new version doesn't mention FancyArrow anymore (except in the url), so I guess it only works for annotation arrows? If not, I guess it would be nice to have something like .-> defining an arrow with a round tail.

@jklymak
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jklymak commented Jan 28, 2022

OK, lets close this, and if you would like to make a feature request, that would be great...

@jklymak jklymak closed this as completed Jan 28, 2022
@mapfiable mapfiable mentioned this issue Jan 28, 2022
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@jklymak @mapfiable