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PyQT5 Backend Partial Redraw Fix #14456

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Merged
merged 4 commits into from
Aug 29, 2019
Merged

PyQT5 Backend Partial Redraw Fix #14456

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bbc1497
Fixing bounding box for QT5.
pshriwise Jun 5, 2019
7db54c0
Using different corner to avoid off-by-one issue.
pshriwise Jun 5, 2019
3c5cbd8
Adding comment on scaling of coords.
pshriwise Jun 5, 2019
13237c2
Added clarity on bounding box construction.
pshriwise Aug 27, 2019
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26 changes: 16 additions & 10 deletions lib/matplotlib/backends/backend_qt5agg.py
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Original file line number Diff line number Diff line change
Expand Up @@ -38,16 +38,21 @@ def paintEvent(self, event):

painter = QtGui.QPainter(self)

rect = event.rect()
left = rect.left()
top = rect.top()
width = rect.width()
height = rect.height()
# See documentation of QRect: bottom() and right() are off by 1, so use
# left() + width() and top() + height().
bbox = Bbox(
[[left, self.renderer.height - (top + height * self._dpi_ratio)],
[left + width * self._dpi_ratio, self.renderer.height - top]])
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())
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Can you leave a comment in the code about why we are calling this?

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Yeah for sure. Good call.

# 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))
Expand All @@ -60,8 +65,9 @@ def paintEvent(self, event):
if hasattr(qimage, 'setDevicePixelRatio'):
# Not available on Qt4 or some older Qt5.
qimage.setDevicePixelRatio(self._dpi_ratio)
origin = QtCore.QPoint(left, top)
painter.drawImage(origin / self._dpi_ratio, qimage)
# 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'):
Expand Down