Add High DPI performance test for reproducing #83

qwt/tests/test_highdpi.py

@@ -0,0 +1,35 @@
+# -*- coding: utf-8 -*-
+#
+# Licensed under the terms of the PyQwt License
+# Copyright (C) 2003-2009 Gerard Vermeulen, for the original PyQwt example
+# Copyright (c) 2015 Pierre Raybaut, for the PyQt5/PySide port and further
+# developments (e.g. ported to PythonQwt API)
+# (see LICENSE file for more details)
+
+SHOW = True  # Show test in GUI-based test launcher
+
+import os
+
+import pytest
+
+from qwt.tests import utils
+from qwt.tests.test_simple import SimplePlot
+
+# Performance should be the same with "1" and "2" scale factors:
+# (as of today, this is not the case, but it has to be fixed in the future:
+#  https://github.com/PlotPyStack/PythonQwt/issues/83)
+os.environ["QT_SCALE_FACTOR"] = "2"
+
+
+class HighDPIPlot(SimplePlot):
+    NUM_POINTS = 5000000  # 5 million points needed to test high DPI support
+
+
+@pytest.mark.skip(reason="This test is not relevant for the automated test suite")
+def test_highdpi():
+    """Test high DPI support"""
+    utils.test_widget(HighDPIPlot, (800, 480))
+
+
+if __name__ == "__main__":
+    test_highdpi()

qwt/tests/test_simple.py

@@ -20,6 +20,7 @@
 
 
 class SimplePlot(qwt.QwtPlot):
+    NUM_POINTS = 100
     TEST_EXPORT = True
 
     def __init__(self):
@@ -30,13 +31,11 @@ def __init__(self):
         self.setAxisTitle(qwt.QwtPlot.yLeft, "Y-axis")
         self.enableAxis(self.xBottom)
         self.setCanvasBackground(Qt.white)
-        canvas = self.canvas()
-        canvas.setBorderRadius(50)
 
         qwt.QwtPlotGrid.make(self, color=Qt.lightGray, width=0, style=Qt.DotLine)
 
         # insert a few curves
-        x = np.arange(0.0, 10.0, 0.1)
+        x = np.linspace(0.0, 10.0, self.NUM_POINTS)
         qwt.QwtPlotCurve.make(x, np.sin(x), "y = sin(x)", self, linecolor="red")
         qwt.QwtPlotCurve.make(x, np.cos(x), "y = cos(x)", self, linecolor="blue")