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Initial HiDPI support for qt5agg backend #6389

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Initial HiDPI support for qt5agg backend #6389

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31 changes: 14 additions & 17 deletions lib/matplotlib/backends/backend_qt5.py
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Original file line number Diff line number Diff line change
Expand Up @@ -249,10 +249,14 @@ def leaveEvent(self, event):
QtWidgets.QApplication.restoreOverrideCursor()
FigureCanvasBase.leave_notify_event(self, guiEvent=event)

def mouseEventCoords(self, pos):
x = pos.x() * self.devicePixelRatio()
# flip y so y=0 is bottom of canvas
y = self.figure.bbox.height - pos.y() * self.devicePixelRatio()
return x, y

def mousePressEvent(self, event):
x = event.pos().x()
# flipy so y=0 is bottom of canvas
y = self.figure.bbox.height - event.pos().y()
x, y = self.mouseEventCoords(event.pos())
button = self.buttond.get(event.button())
if button is not None:
FigureCanvasBase.button_press_event(self, x, y, button,
Expand All @@ -261,9 +265,7 @@ def mousePressEvent(self, event):
print('button pressed:', event.button())

def mouseDoubleClickEvent(self, event):
x = event.pos().x()
# flipy so y=0 is bottom of canvas
y = self.figure.bbox.height - event.pos().y()
x, y = self.mouseEventCoords(event.pos())
button = self.buttond.get(event.button())
if button is not None:
FigureCanvasBase.button_press_event(self, x, y,
Expand All @@ -273,16 +275,12 @@ def mouseDoubleClickEvent(self, event):
print('button doubleclicked:', event.button())

def mouseMoveEvent(self, event):
x = event.x()
# flipy so y=0 is bottom of canvas
y = self.figure.bbox.height - event.y()
x, y = self.mouseEventCoords(event)
FigureCanvasBase.motion_notify_event(self, x, y, guiEvent=event)
# if DEBUG: print('mouse move')

def mouseReleaseEvent(self, event):
x = event.x()
# flipy so y=0 is bottom of canvas
y = self.figure.bbox.height - event.y()
x, y = self.mouseEventCoords(event)
button = self.buttond.get(event.button())
if button is not None:
FigureCanvasBase.button_release_event(self, x, y, button,
Expand All @@ -291,9 +289,7 @@ def mouseReleaseEvent(self, event):
print('button released')

def wheelEvent(self, event):
x = event.x()
# flipy so y=0 is bottom of canvas
y = self.figure.bbox.height - event.y()
x, y = self.mouseEventCoords(event)
# from QWheelEvent::delta doc
if event.pixelDelta().x() == 0 and event.pixelDelta().y() == 0:
steps = event.angleDelta().y() / 120
Expand Down Expand Up @@ -323,8 +319,9 @@ def keyReleaseEvent(self, event):
print('key release', key)

def resizeEvent(self, event):
w = event.size().width()
h = event.size().height()
dpi_ratio = getattr(self, '_dpi_ratio', 1)
w = event.size().width() * dpi_ratio
h = event.size().height() * dpi_ratio
if DEBUG:
print('resize (%d x %d)' % (w, h))
print("FigureCanvasQt.resizeEvent(%d, %d)" % (w, h))
Expand Down
3 changes: 3 additions & 0 deletions lib/matplotlib/backends/backend_qt5agg.py
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Original file line number Diff line number Diff line change
Expand Up @@ -100,6 +100,7 @@ def paintEvent(self, e):
qImage = QtGui.QImage(stringBuffer, self.renderer.width,
self.renderer.height,
QtGui.QImage.Format_ARGB32)
qImage.setDevicePixelRatio(self._dpi_ratio)
# get the rectangle for the image
rect = qImage.rect()
p = QtGui.QPainter(self)
Expand Down Expand Up @@ -135,6 +136,7 @@ def paintEvent(self, e):
stringBuffer = reg.to_string_argb()
qImage = QtGui.QImage(stringBuffer, w, h,
QtGui.QImage.Format_ARGB32)
qImage.setDevicePixelRatio(self._dpi_ratio)
# Adjust the stringBuffer reference count to work
# around a memory leak bug in QImage() under PySide on
# Python 3.x
Expand Down Expand Up @@ -222,6 +224,7 @@ def __init__(self, figure):
super(FigureCanvasQTAgg, self).__init__(figure=figure)
self._drawRect = None
self.blitbox = []
self._dpi_ratio = self.devicePixelRatio()
self.setAttribute(QtCore.Qt.WA_OpaquePaintEvent)


Expand Down