Description
Bug report
Bug summary
We noticed weird border issues after upgrading matplotlib from 3.0.3 to higher versions. I tried searching through the open issues but I couldn't find a matching one. I also tried looking through the changelog for 3.1.0 but nothing stood out.
Code for reproduction
This is a bit simplified version of what we're doing on production:
import io
from matplotlib.figure import Figure
from matplotlib.patches import Arc, Rectangle
from matplotlib.backends.backend_agg import FigureCanvasAgg as FigureCanvas
graph_path = "/tmp/foobar.png"
PITCH_WIDTH = 65
PITCH_LENGTH = 105
PITCH_SCALE = 8
# Create example pitch graph
fig = Figure(figsize=(PITCH_WIDTH / PITCH_SCALE, PITCH_LENGTH / PITCH_SCALE))
ax = fig.subplots()
ax.set_facecolor("#1e1e1e")
ax.set_xlim(0, PITCH_WIDTH)
ax.set_ylim(0, PITCH_LENGTH)
pitch_borders = Rectangle(
(0, 0),
width=PITCH_WIDTH,
height=PITCH_LENGTH,
color="#ffffff",
fill=False,
lw=2,
zorder=10,
)
ax.add_patch(pitch_borders)
halfway_line = Rectangle(
(0, PITCH_LENGTH / 2),
width=PITCH_WIDTH,
height=0,
color="#ffffff",
fill=False,
lw=2,
zorder=0,
)
ax.add_patch(halfway_line)
centre_circle = Arc(
(PITCH_WIDTH / 2, PITCH_LENGTH / 2),
width=18,
height=18,
color="#ffffff",
theta1=0,
theta2=360,
lw=2,
zorder=0,
)
ax.add_patch(centre_circle)
ax.get_xaxis().set_visible(False)
ax.get_yaxis().set_visible(False)
# Export it to bytes buffer
buffer = io.BytesIO()
canvas = FigureCanvas(fig)
canvas.print_figure(buffer, dpi=150, bbox_inches="tight", pad_inches=0)
buffer.seek(0)
# Save buffer to a file
with open(graph_path, "wb") as f:
f.write(buffer.getvalue())Actual outcome
On versions newer then 3.0.3 you can see weird borders on left and bottom side.
On version 3.1.3:
On version 3.2.1:
Expected outcome
On version 3.0.3 it works as expected, without the weird borders:
We're not sure if it's something we're doing wrong (so a fix for matplotlib was a regression for us) or is there a bigger bug there.
Matplotlib version
- Operating system: OS X 10.14.6
- Matplotlib version: 3.2.1 (and 3.1.3)
- Matplotlib backend (
print(matplotlib.get_backend())): this returnsTkAgg, but we explicitly useAggvia.FigureCanvasAgg - Python version: 3.7.7
- Jupyter version (if applicable): n/a
- Other libraries: n/a
Python installed via pyenv, matplotlib installed via pip inside a virtualenv. No other extra libraries.