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Description
Bug report
Bug summary
fig.savefig(...) changes the size of the figure it is trying to save to file
minor note: problem doesn't occur when size_figure_inches<=5
Code for reproduction
import numpy as np
import matplotlib
import matplotlib.pyplot as plt
FORCE_RESIZE_WINDOW = False
class Figure:
size_figure_inches = 10.0 #< size of full figure
size_world_half = 5 #< 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)
self.cla()
def cla(self):
if FORCE_RESIZE_WINDOW:
sfi = self.size_figure_inches
self.fig.set_size_inches(sfi, sfi)
self.fig.set_dpi(100)
# --- clear axis (resets limits)
plt.cla()
# --- set limits
swh = self.size_world_half
self.ax.set_ylim(-swh, +swh)
self.ax.set_xlim(-swh, +swh)
#--- setup grid
self.ax.set_xticks(range(-swh, +swh))
self.ax.set_yticks(range(-swh, +swh))
self.ax.grid(color='k')
self.ax.grid(True)
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()
print("backend: ", matplotlib.get_backend() )
fig = Figure(1)
offs = np.arange(-1, +1, .25)
for i, off in enumerate(offs):
fig.cla()
fig.plot2(M_restpose)
fig.fig.savefig("./test%d.png" % i)
plt.pause(.1)
print("Figure size for test%d " % i, fig.fig.get_size_inches())Actual outcome
backend: TkAgg
Figure size for test0 [10. 9.66]
Figure size for test1 [10. 9.32]
Figure size for test2 [10. 8.98]
Figure size for test3 [10. 8.64]
Figure size for test4 [10. 8.3]
Figure size for test5 [10. 7.96]
Figure size for test6 [10. 7.62]
Figure size for test7 [10. 7.28]
Below the images generated by test0 and test7
Expected outcome
Image size should not change.
Result can be achieved by setting FORCE_RESIZE_WINDOW=True in the code above.
The terminal output is then:
backend: TkAgg
Figure size for test0 [10. 9.66]
Figure size for test1 [10. 9.66]
Figure size for test2 [10. 9.66]
Figure size for test3 [10. 9.66]
Figure size for test4 [10. 9.66]
Figure size for test5 [10. 9.66]
Figure size for test6 [10. 9.66]
Figure size for test7 [10. 9.66]
While the script reports 9.66in in height, note the outputted files are correctly 1000x1000 as shown below:
Matplotlib version
- Operating system: debian
- Matplotlib version: 2.1.2 (installed w/ pip)
- Matplotlib backend (
print(matplotlib.get_backend())): TkAgg - Python version: 3.5
- Jupyter version (if applicable): N/A
- Other libraries:
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