Closed
Description
Bug report
Bug summary
My app worked well in previous matplotlib versions. After upgrading to 2.1.0, it is completely broken, flooded with QWidget::repaint: Recursive repaint detected messages.
Code for reproduction
import matplotlib as mpl
import matplotlib.lines
from matplotlib.backends.backend_qt5agg import FigureCanvasQTAgg
class Qt5Canvas(FigureCanvasQTAgg):
def __init__(self, parent=None, aspect_ratio=3/4, dpi=96,
width=None, height=None):
if width is not None:
figsize = (width, height)
else:
figsize = mpl.figure.figaspect(aspect_ratio)
fig = mpl.figure.Figure(figsize=figsize, dpi=dpi)
super().__init__(fig)
self.fig = fig
self.ax = fig.add_subplot(111)
self.setParent(parent)
class TestMplBug:
def __init__(self):
self.artist = None
self.canvas = None
self._blit_region = None
self._drawed = False
def set_canvas(self, canvas):
self.canvas = canvas
self.canvas.mpl_connect('draw_event', self._on_mpl_draw)
def _on_mpl_draw(self, event):
self._drawed = True
self.blit_update()
def draw(self):
self._on_draw()
self.canvas.draw()
def _on_draw(self):
if self.artist is None:
import numpy as np
x = np.arange(0.0, 3.0, 0.01)
y = np.sin(2*np.pi*x)
line = mpl.lines.Line2D(x, y, color='red', animated=True)
self.canvas.ax.add_line(line)
self.artist = line
def blit_update(self):
if self.canvas is None:
return
self.canvas.ax.draw_artist(self.artist)
if self._drawed:
self.canvas.blit()
def main():
from PyQt5 import QtWidgets, QtCore, QtGui
import sys
app = QtWidgets.QApplication.instance()
if app is None:
app = QtWidgets.QApplication(sys.argv)
t = TestMplBug()
q = Qt5Canvas()
t.set_canvas(q)
t.draw()
t.canvas.show()
try:
__IPYTHON__
except NameError as e:
app.exec_()
return t
if __name__ == '__main__':
main()Actual outcome
QWidget::repaint: Recursive repaint detected
<many similar entries omited...>
QWidget::repaint: Recursive repaint detected
Traceback (most recent call last):
File "/home/statistician/.local/lib/python3.6/site-packages/matplotlib/backends/backend_qt5agg.py", line 149, in __draw_idle_agg
self.draw()
File "/home/statistician/.local/lib/python3.6/site-packages/matplotlib/backends/backend_qt5agg.py", line 127, in draw
super(FigureCanvasQTAggBase, self).draw()
File "/home/statistician/.local/lib/python3.6/site-packages/matplotlib/backends/backend_agg.py", line 430, in draw
self.figure.draw(self.renderer)
File "/home/statistician/.local/lib/python3.6/site-packages/matplotlib/artist.py", line 55, in draw_wrapper
return draw(artist, renderer, *args, **kwargs)
File "/home/statistician/.local/lib/python3.6/site-packages/matplotlib/figure.py", line 1295, in draw
renderer, self, artists, self.suppressComposite)
File "/home/statistician/.local/lib/python3.6/site-packages/matplotlib/image.py", line 138, in _draw_list_compositing_images
a.draw(renderer)
File "/home/statistician/.local/lib/python3.6/site-packages/matplotlib/artist.py", line 55, in draw_wrapper
return draw(artist, renderer, *args, **kwargs)
File "/home/statistician/.local/lib/python3.6/site-packages/matplotlib/axes/_base.py", line 2399, in draw
mimage._draw_list_compositing_images(renderer, self, artists)
File "/home/statistician/.local/lib/python3.6/site-packages/matplotlib/image.py", line 138, in _draw_list_compositing_images
a.draw(renderer)
File "/home/statistician/.local/lib/python3.6/site-packages/matplotlib/artist.py", line 55, in draw_wrapper
return draw(artist, renderer, *args, **kwargs)
File "/home/statistician/.local/lib/python3.6/site-packages/matplotlib/axis.py", line 1133, in draw
ticks_to_draw = self._update_ticks(renderer)
File "/home/statistician/.local/lib/python3.6/site-packages/matplotlib/axis.py", line 974, in _update_ticks
tick_tups = list(self.iter_ticks())
File "/home/statistician/.local/lib/python3.6/site-packages/matplotlib/axis.py", line 917, in iter_ticks
majorLocs = self.major.locator()
File "/home/statistician/.local/lib/python3.6/site-packages/matplotlib/ticker.py", line 1957, in __call__
return self.tick_values(vmin, vmax)
File "/home/statistician/.local/lib/python3.6/site-packages/matplotlib/ticker.py", line 1965, in tick_values
locs = self._raw_ticks(vmin, vmax)
File "/home/statistician/.local/lib/python3.6/site-packages/matplotlib/ticker.py", line 1907, in _raw_ticks
nbins = np.clip(self.axis.get_tick_space(),
File "/home/statistician/.local/lib/python3.6/site-packages/matplotlib/axis.py", line 2039, in get_tick_space
tick = self._get_tick(True)
File "/home/statistician/.local/lib/python3.6/site-packages/matplotlib/axis.py", line 1748, in _get_tick
return XTick(self.axes, 0, '', major=major, **tick_kw)
File "/home/statistician/.local/lib/python3.6/site-packages/matplotlib/axis.py", line 152, in __init__
self.apply_tickdir(tickdir)
File "/home/statistician/.local/lib/python3.6/site-packages/matplotlib/axis.py", line 403, in apply_tickdir
self.stale = True
File "/home/statistician/.local/lib/python3.6/site-packages/matplotlib/artist.py", line 241, in stale
self.stale_callback(self, val)
File "/home/statistician/.local/lib/python3.6/site-packages/matplotlib/artist.py", line 68, in _stale_axes_callback
self.axes.stale = val
File "/home/statistician/.local/lib/python3.6/site-packages/matplotlib/artist.py", line 241, in stale
self.stale_callback(self, val)
File "/home/statistician/.local/lib/python3.6/site-packages/matplotlib/figure.py", line 56, in _stale_figure_callback
self.figure.stale = val
RecursionError: maximum recursion depth exceeded while calling a Python object
QWidget::paintEngine: Should no longer be called
QPainter::begin: Paint device returned engine == 0, type: 1
QPainter::end: Painter not active, aborted
<many similar entries omited...>
QWidget::paintEngine: Should no longer be called
QPainter::begin: Paint device returned engine == 0, type: 1
QPainter::end: Painter not active, aborted
Expected outcome
Draw properly as in previous versions.
Matplotlib version
- Operating system: Arch Linux
- Matplotlib version: 2.1.0 (installed from pip)
- Matplotlib backend (
print(matplotlib.get_backend())): qt5 - Python version: 3.6.2
- Jupyter version (if applicable):
- Other libraries:
Metadata
Metadata
Assignees
Labels
No labels