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Qt5: Fix event positions on HiDPI screens. #8144

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Merged
merged 1 commit into from
Mar 15, 2017
Merged

Qt5: Fix event positions on HiDPI screens. #8144

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11 changes: 9 additions & 2 deletions 11 lib/matplotlib/backends/backend_qt5.py
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Original file line number Diff line number Diff line change
Expand Up @@ -263,9 +263,16 @@ def leaveEvent(self, event):
FigureCanvasBase.leave_notify_event(self, guiEvent=event)

def mouseEventCoords(self, pos):
x = pos.x() * self._dpi_ratio
"""
Calculate mouse coordinates in logical pixels.

Qt5 and Matplotlib use logical pixels, but the figure is scaled to
physical pixels for rendering. Also, the origin is different and needs
to be corrected.
"""
x = pos.x()
# flip y so y=0 is bottom of canvas
y = self.figure.bbox.height - pos.y() * self._dpi_ratio
y = self.figure.bbox.height / self._dpi_ratio - pos.y()
return x, y

def mousePressEvent(self, event):
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