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[Bug]: hatch inconsistency between PDF and png #22862

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caizixian opened this issue Apr 19, 2022 · 3 comments
Closed

[Bug]: hatch inconsistency between PDF and png #22862

caizixian opened this issue Apr 19, 2022 · 3 comments
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backend: pdf status: confirmed bug status: duplicate topic: hatch

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@caizixian
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Bug summary

When drawing with hatches, dots show up in PDF as circles but they render fine as PNGs.

Code for reproduction

import matplotlib.pyplot as plt

fig, ax = plt.subplots(figsize=(6, 3))
ax.bar([1], height=4, hatch=".")
plt.savefig("demo.pdf")

fig, ax = plt.subplots(figsize=(6, 3))
ax.bar([1], height=4, hatch=".")
plt.savefig("demo.png", dpi=300)

Actual outcome

PDF
demo.pdf
PDF converted as png
demo

PNG
demo

Expected outcome

The PNG and the PDF should look the same.

Additional information

No response

Operating system

macOS 12.3.1

Matplotlib Version

3.4.3

Matplotlib Backend

module://matplotlib_inline.backend_inline (inside jupyter notebook), PDF backend when generating PDF

Python version

Python 3.8.9

Jupyter version

6.4.0

Installation

pip
@oscargus
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oscargus commented Apr 19, 2022 •
edited
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This seems to be a problem for filled hatches. Same with '*'.

Maybe related to #3841 and #16052

@banarni
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banarni commented Jul 4, 2022

Just an additional observation for the backend-experts: A custom patch without facecolor is rendered correctly. Additionally, an edgecolor is only necessary for png export, not for pdf.

Code

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

fig, ax = plt.subplots(figsize=(6, 3))
bar = ax.bar([1], height=4, hatch=".", label="auto")
patch_custom_1 = Patch(label="custom - with fc", hatch=".", edgecolor="k")
patch_custom_2 = Patch(label="custom - without fc", hatch=".", edgecolor="k", facecolor="None")
patch_custom_3 = Patch(label="custom - without fc and ec", hatch=".", edgecolor="None", facecolor="None")

leg = plt.legend(handles=[bar, patch_custom_1, patch_custom_2, patch_custom_3], labelspacing=2, borderpad=1)
for patch in leg.get_patches():
    patch.set_height(20)
    patch.set_y(-7)

plt.xlim([0, 5])
plt.savefig("demo.pdf")

fig, ax = plt.subplots(figsize=(6, 3))
bar = ax.bar([1], height=4, hatch=".", label="auto")
patch_custom_1 = Patch(label="custom - with fc", hatch=".", edgecolor="k")
patch_custom_2 = Patch(label="custom - without fc", hatch=".", edgecolor="k", facecolor="None")
patch_custom_3 = Patch(label="custom - without fc and ec", hatch=".", edgecolor="None", facecolor="None")

leg = plt.legend(handles=[bar, patch_custom_1, patch_custom_2, patch_custom_3], labelspacing=2, borderpad=1)
for patch in leg.get_patches():
    patch.set_height(20)
    patch.set_y(-7)

plt.xlim([0, 5])
plt.savefig("demo.png", dpi=300)

Output

PDF (demo.pdf)
demo_pdf

PNG
demo

@QuLogic
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QuLogic commented Jul 4, 2022

This is a duplicate of #10034.

@QuLogic QuLogic closed this as completed Jul 4, 2022
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backend: pdf status: confirmed bug status: duplicate topic: hatch
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@QuLogic @caizixian @oscargus @banarni