diff --git a/lib/matplotlib/backends/backend_qt5.py b/lib/matplotlib/backends/backend_qt5.py
index 1265479d2ead..0642dcfab87a 100644
--- a/lib/matplotlib/backends/backend_qt5.py
+++ b/lib/matplotlib/backends/backend_qt5.py
@@ -486,7 +486,7 @@ def drawRectangle(self, rect):
# Draw the zoom rectangle to the QPainter. _draw_rect_callback needs
# to be called at the end of paintEvent.
if rect is not None:
- x0, y0, w, h = [pt / self._dpi_ratio for pt in rect]
+ x0, y0, w, h = [int(pt / self._dpi_ratio) for pt in rect]
x1 = x0 + w
y1 = y0 + h
def _draw_rect_callback(painter):
diff --git a/lib/matplotlib/backends/backend_qt5agg.py b/lib/matplotlib/backends/backend_qt5agg.py
index 2d4d636d4018..11b60378ac39 100644
--- a/lib/matplotlib/backends/backend_qt5agg.py
+++ b/lib/matplotlib/backends/backend_qt5agg.py
@@ -38,45 +38,46 @@ def paintEvent(self, event):
return
painter = QtGui.QPainter(self)
-
- # See documentation of QRect: bottom() and right() are off by 1, so use
- # left() + width() and top() + height().
- rect = event.rect()
- # scale rect dimensions using the screen dpi ratio to get
- # correct values for the Figure coordinates (rather than QT5's coords)
- width = rect.width() * self._dpi_ratio
- height = rect.height() * self._dpi_ratio
- left, top = self.mouseEventCoords(rect.topLeft())
- # shift the "top" by the height of the image to get the
- # correct corner for our coordinate system
- bottom = top - height
- # same with the right side of the image
- right = left + width
- # create a buffer using the image bounding box
- bbox = Bbox([[left, bottom], [right, top]])
- reg = self.copy_from_bbox(bbox)
- buf = cbook._unmultiplied_rgba8888_to_premultiplied_argb32(
- memoryview(reg))
-
- # clear the widget canvas
- painter.eraseRect(rect)
-
- qimage = QtGui.QImage(buf, buf.shape[1], buf.shape[0],
- QtGui.QImage.Format_ARGB32_Premultiplied)
- if hasattr(qimage, 'setDevicePixelRatio'):
- # Not available on Qt4 or some older Qt5.
- qimage.setDevicePixelRatio(self._dpi_ratio)
- # set origin using original QT coordinates
- origin = QtCore.QPoint(rect.left(), rect.top())
- painter.drawImage(origin, qimage)
- # Adjust the buf reference count to work around a memory
- # leak bug in QImage under PySide on Python 3.
- if QT_API in ('PySide', 'PySide2'):
- ctypes.c_long.from_address(id(buf)).value = 1
-
- self._draw_rect_callback(painter)
-
- painter.end()
+ try:
+ # See documentation of QRect: bottom() and right() are off
+ # by 1, so use left() + width() and top() + height().
+ rect = event.rect()
+ # scale rect dimensions using the screen dpi ratio to get
+ # correct values for the Figure coordinates (rather than
+ # QT5's coords)
+ width = rect.width() * self._dpi_ratio
+ height = rect.height() * self._dpi_ratio
+ left, top = self.mouseEventCoords(rect.topLeft())
+ # shift the "top" by the height of the image to get the
+ # correct corner for our coordinate system
+ bottom = top - height
+ # same with the right side of the image
+ right = left + width
+ # create a buffer using the image bounding box
+ bbox = Bbox([[left, bottom], [right, top]])
+ reg = self.copy_from_bbox(bbox)
+ buf = cbook._unmultiplied_rgba8888_to_premultiplied_argb32(
+ memoryview(reg))
+
+ # clear the widget canvas
+ painter.eraseRect(rect)
+
+ qimage = QtGui.QImage(buf, buf.shape[1], buf.shape[0],
+ QtGui.QImage.Format_ARGB32_Premultiplied)
+ if hasattr(qimage, 'setDevicePixelRatio'):
+ # Not available on Qt4 or some older Qt5.
+ qimage.setDevicePixelRatio(self._dpi_ratio)
+ # set origin using original QT coordinates
+ origin = QtCore.QPoint(rect.left(), rect.top())
+ painter.drawImage(origin, qimage)
+ # Adjust the buf reference count to work around a memory
+ # leak bug in QImage under PySide on Python 3.
+ if QT_API in ('PySide', 'PySide2'):
+ ctypes.c_long.from_address(id(buf)).value = 1
+
+ self._draw_rect_callback(painter)
+ finally:
+ painter.end()
def print_figure(self, *args, **kwargs):
super().print_figure(*args, **kwargs)
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