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FIX: properly mix blitting + redraw in Qt4Agg/Qt5Agg #8948

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FIX: properly mix blitting + redraw in Qt4Agg/Qt5Agg #8948

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10 changes: 9 additions & 1 deletion lib/matplotlib/backends/backend_qt5agg.py
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Original file line number Diff line number Diff line change
Expand Up @@ -37,6 +37,10 @@ def __init__(self, figure):
self._agg_draw_pending = False
self._bbox_queue = []
self._drawRect = None
# used to keep track if there has been a whole-canvas
# render since the last paint event (which moves the
# pixels to the screen)
self.__full_redraw = True

def drawRectangle(self, rect):
if rect is not None:
Expand All @@ -63,13 +67,14 @@ def paintEvent(self, e):

painter = QtGui.QPainter(self)

if self._bbox_queue:
if not self.__full_redraw and self._bbox_queue:
bbox_queue = self._bbox_queue
else:
painter.eraseRect(self.rect())
bbox_queue = [
Bbox([[0, 0], [self.renderer.width, self.renderer.height]])]
self._bbox_queue = []
self.__full_redraw = False
for bbox in bbox_queue:
l, b, r, t = map(int, bbox.extents)
w = r - l
Expand Down Expand Up @@ -103,6 +108,9 @@ def draw(self):
# The Agg draw is done here; delaying causes problems with code that
# uses the result of the draw() to update plot elements.
super(FigureCanvasQTAggBase, self).draw()
# flip this bit so in the paint event we know to ignore any
# blit requests
self.__full_redraw = True
self.update()

def draw_idle(self):
Expand Down