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Qt5: Fix event positions on HiDPI screens. #8144

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merged 1 commit into from
Mar 15, 2017
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Qt5: Fix event positions on HiDPI screens. #8144

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11 changes: 9 additions & 2 deletions 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):
Expand Down