Closed
Description
Bug report
Bug summary
when the GUI blocks (either via plt.pause(...) or plt.show(block=True)) the size of the figure changes, and when it is saved to file the dimensions are mismatched to the ones set by set_size_inches(..)
Code for reproduction
import imageio
import numpy as np
FORCE_IMAGE_RESIZE_ON_PAUSE = False
# Switch backends
import matplotlib
if False:
matplotlib.use("Qt5Agg")
else:
matplotlib.use("TkAgg")
import matplotlib.pyplot as plt
import matplotlib
from sys import platform, version
print("backend ", matplotlib.get_backend() )
print("matplotlib ", matplotlib.__version__)
print("python ", version.split(" ")[0])
print("OS ", platform)
class Figure:
size_figure_inches = 8.0 #< size of full figure
size_world_half = 2 #< size of world (centered 0)
def __init__(self, fid):
self.fig = plt.figure(fid)
self.canvas = self.fig.canvas
#--- specify figure
sfi = self.size_figure_inches
self.fig.set_size_inches(sfi, sfi)
self.fig.set_dpi(100)
# --- specify axis
self.ax = self.fig.add_axes([0, 0, 1, 1]) # < (full image)
# TODO bug https://github.com/matplotlib/matplotlib/issues/10566
def pause(self, time):
plt.pause(time)
if FORCE_IMAGE_RESIZE_ON_PAUSE:
sfi = self.size_figure_inches
self.fig.set_size_inches(sfi, sfi)
def plot2(self, P):
x = P[:, 0]
y = P[:, 1]
self.ax.plot(x, y)
#------------------------------------------------------------------------------------------
t = np.arange(0.0, 2.0, 0.01)
s = 1 + np.sin(2*np.pi*t)
x = np.cos(2*np.pi*t)
y = np.sin(2*np.pi*t)
M_restpose = np.vstack([x,y]).transpose()
fig = Figure(1)
offs = np.arange(-1, +1, 1)
for i, off in enumerate(offs):
print("(1) Figure size for test%d " % i, fig.fig.get_size_inches())
fig.ax.cla()
print("(2) Figure size for test%d " % i, fig.fig.get_size_inches())
fig.plot2(M_restpose)
print("(3) Figure size for test%d " % i, fig.fig.get_size_inches())
fig.fig.savefig("./test%d.png" % i)
print(" Png size:", imageio.imread("./test%d.png"%i).shape)
print("(4) Figure size for test%d " % i, fig.fig.get_size_inches())
fig.pause(1)
print("(5) Figure size for test%d " % i, fig.fig.get_size_inches())
print("\n")Actual outcome
backend TkAgg
matplotlib 2.2.0rc1
python 3.5.3
OS linux
(1) Figure size for test0 [8. 8.]
(2) Figure size for test0 [8. 8.]
(3) Figure size for test0 [8. 8.]
Png size: (800, 800, 4)
(4) Figure size for test0 [8. 8.]
(5) Figure size for test0 [8. 7.66]
(1) Figure size for test1 [8. 7.66]
(2) Figure size for test1 [8. 7.66]
(3) Figure size for test1 [8. 7.66]
Png size: (766, 800, 4)
(4) Figure size for test1 [8. 7.66]
(5) Figure size for test1 [8. 7.66]
note: using Qt5 as backend doesn't cause problem:
backend Qt5Agg
matplotlib 2.2.0rc1
python 3.5.3
OS linux
(1) Figure size for test0 [8. 8.]
(2) Figure size for test0 [8. 8.]
(3) Figure size for test0 [8. 8.]
Png size: (800, 800, 4)
(4) Figure size for test0 [8. 8.]
(5) Figure size for test0 [8. 8.]
(1) Figure size for test1 [8. 8.]
(2) Figure size for test1 [8. 8.]
(3) Figure size for test1 [8. 8.]
Png size: (800, 800, 4)
(4) Figure size for test1 [8. 8.]
(5) Figure size for test1 [8. 8.]
note: replacing plt.pause(.1) with plt.show(block=False) gives:
backend: TkAgg
(1) Figure size for test0 [8. 8.]
(2) Figure size for test0 [8. 8.]
(3) Figure size for test0 [8. 8.]
Png size: (800, 800, 4)
(4) Figure size for test0 [8. 8.]
(5) Figure size for test0 [8. 8.]
(1) Figure size for test1 [8. 8.]
(2) Figure size for test1 [8. 8.]
(3) Figure size for test1 [8. 8.]
Png size: (800, 800, 4)
(4) Figure size for test1 [8. 8.]
(5) Figure size for test1 [8. 8.]
Image size should not change.
Matplotlib version
- Operating system: debian
- Matplotlib version: 2.2.0rc1 (installed w/ pip)
- Matplotlib backend (
print(matplotlib.get_backend())): TkAgg - Python version: 3.5
- Jupyter version (if applicable): N/A
- Other libraries: