Pass HighDPI info from Qt5 to underlying Agg figure.

QuLogic · QuLogic · commit f599034f55cc · 2016-11-24T03:09:38.000-05:00
diff --git a/lib/matplotlib/backends/backend_qt5.py b/lib/matplotlib/backends/backend_qt5.py
@@ -243,6 +243,11 @@ def __init__(self, figure):
         w, h = self.get_width_height()
         self.resize(w, h)
 
+    def get_width_height(self):
+        dpi_ratio = self.devicePixelRatio()
+        w, h = FigureCanvasBase.get_width_height(self)
+        return int(w / dpi_ratio), int(h / dpi_ratio)
+
     def enterEvent(self, event):
         FigureCanvasBase.enter_notify_event(self, guiEvent=event)
 
@@ -320,7 +325,7 @@ def keyReleaseEvent(self, event):
             print('key release', key)
 
     def resizeEvent(self, event):
-        dpi_ratio = getattr(self, '_dpi_ratio', 1)
+        dpi_ratio = self.devicePixelRatio()
         w = event.size().width() * dpi_ratio
         h = event.size().height() * dpi_ratio
         if DEBUG:
diff --git a/lib/matplotlib/backends/backend_qt5agg.py b/lib/matplotlib/backends/backend_qt5agg.py
@@ -229,6 +229,11 @@ def __init__(self, figure):
         self._drawRect = None
         self.blitbox = []
         self._dpi_ratio = self.devicePixelRatio()
+        # We don't want to scale up the figure DPI more than once.
+        # Note, we don't handle a signal for changing DPI yet.
+        if not hasattr(self.figure, '_original_dpi'):
+            self.figure._original_dpi = self.figure.dpi
+        self.figure.dpi = self._dpi_ratio * self.figure._original_dpi
         self.setAttribute(QtCore.Qt.WA_OpaquePaintEvent)
 
 
