@@ -38,45 +38,46 @@ def paintEvent(self, event):
3838return
3939
4040painter = QtGui .QPainter (self )
41-
42- # See documentation of QRect: bottom() and right() are off by 1, so use
43- # left() + width() and top() + height().
44- rect = event .rect ()
45- # scale rect dimensions using the screen dpi ratio to get
46- # correct values for the Figure coordinates (rather than QT5's coords)
47- width = rect .width ()* self ._dpi_ratio
48- height = rect .height ()* self ._dpi_ratio
49- left ,top = self .mouseEventCoords (rect .topLeft ())
50- # shift the "top" by the height of the image to get the
51- # correct corner for our coordinate system
52- bottom = top - height
53- # same with the right side of the image
54- right = left + width
55- # create a buffer using the image bounding box
56- bbox = Bbox ([[left ,bottom ], [right ,top ]])
57- reg = self .copy_from_bbox (bbox )
58- buf = cbook ._unmultiplied_rgba8888_to_premultiplied_argb32 (
59- memoryview (reg ))
60-
61- # clear the widget canvas
62- painter .eraseRect (rect )
63-
64- qimage = QtGui .QImage (buf ,buf .shape [1 ],buf .shape [0 ],
65- QtGui .QImage .Format_ARGB32_Premultiplied )
66- if hasattr (qimage ,'setDevicePixelRatio' ):
67- # Not available on Qt4 or some older Qt5.
68- qimage .setDevicePixelRatio (self ._dpi_ratio )
69- # set origin using original QT coordinates
70- origin = QtCore .QPoint (rect .left (),rect .top ())
71- painter .drawImage (origin ,qimage )
72- # Adjust the buf reference count to work around a memory
73- # leak bug in QImage under PySide on Python 3.
74- if QT_API in ('PySide' ,'PySide2' ):
75- ctypes .c_long .from_address (id (buf )).value = 1
76-
77- self ._draw_rect_callback (painter )
78-
79- painter .end ()
41+ try :
42+ # See documentation of QRect: bottom() and right() are off
43+ # by 1, so use left() + width() and top() + height().
44+ rect = event .rect ()
45+ # scale rect dimensions using the screen dpi ratio to get
46+ # correct values for the Figure coordinates (rather than
47+ # QT5's coords)
48+ width = rect .width ()* self ._dpi_ratio
49+ height = rect .height ()* self ._dpi_ratio
50+ left ,top = self .mouseEventCoords (rect .topLeft ())
51+ # shift the "top" by the height of the image to get the
52+ # correct corner for our coordinate system
53+ bottom = top - height
54+ # same with the right side of the image
55+ right = left + width
56+ # create a buffer using the image bounding box
57+ bbox = Bbox ([[left ,bottom ], [right ,top ]])
58+ reg = self .copy_from_bbox (bbox )
59+ buf = cbook ._unmultiplied_rgba8888_to_premultiplied_argb32 (
60+ memoryview (reg ))
61+
62+ # clear the widget canvas
63+ painter .eraseRect (rect )
64+
65+ qimage = QtGui .QImage (buf ,buf .shape [1 ],buf .shape [0 ],
66+ QtGui .QImage .Format_ARGB32_Premultiplied )
67+ if hasattr (qimage ,'setDevicePixelRatio' ):
68+ # Not available on Qt4 or some older Qt5.
69+ qimage .setDevicePixelRatio (self ._dpi_ratio )
70+ # set origin using original QT coordinates
71+ origin = QtCore .QPoint (rect .left (),rect .top ())
72+ painter .drawImage (origin ,qimage )
73+ # Adjust the buf reference count to work around a memory
74+ # leak bug in QImage under PySide on Python 3.
75+ if QT_API in ('PySide' ,'PySide2' ):
76+ ctypes .c_long .from_address (id (buf )).value = 1
77+
78+ self ._draw_rect_callback (painter )
79+ finally :
80+ painter .end ()
8081
8182def blit (self ,bbox = None ):
8283# docstring inherited