Saving png with text and border=True leads to artifacts

[chudlerk]

Take the following simple code

import ultraplot as uplt

fig,ax = uplt.subplots()
ax.text(
    .5,.5,
    'ABCDEFGHIJKLMNOPQRSTUVWXYZ',
    ha='center',
    color='w',  
    border=True,
    bordercolor='k',
    borderwidth=3,
    )
fig.savefig('C:/Users/kchudler/Downloads/fig_w_border_arg.png')

The figure displays fine on my display. However, if I open the saved png, I see that some of the letters have these weird pointy artifacts in the letter borders:

If I use path_effects instead, the artifacts do not appear:

import matplotlib.patheffects as pe
import ultraplot as uplt

fig,ax = uplt.subplots()
ax.text(
    .5,.5,
    'ABCDEFGHIJKLMNOPQRSTUVWXYZ',
    ha='center',
    color='w',  
    path_effects=[pe.withStroke(linewidth=3, foreground='k')],
    )
fig.savefig('C:/Users/kchudler/Downloads/fig_w_patheffects.png')

[cvanelteren]

Thanks for reporting! Will have a look at this. On the top of my head, I am not sure what UltraPlot does with the text stuff.

[cvanelteren]

Ok the issue is the mismatch in the default borderstyle. We use "miter" by default, if you swtich to "bevel" the issue dissapears, i.e.

import ultraplot as uplt
fig, ax = uplt.subplots()
ax.text(
     .5, .5, "ABCDEFGHIJKLMNOPQRSTUVWXYZ",
     ha="center",
     color="w",
     border=True,
     bordercolor="k",
     borderwidth=3,
     borderstyle="round",  # or "bevel"
 )
fig.save("test.png")

[cvanelteren]

I think we should change this to "bevel" and have an rc param for this

[cvanelteren]

The figure displays fine on my display. However, if I open the saved png, I see that some of the letters have these weird pointy artifacts in the letter borders:

for me it looks jagged in the miter case on screen as well as on the image