Using QtPy*: tested on PyQt4, PyQt5, Python 2.7, Python 3.4+

Still fails with PySide2

* instead of internal qwt.qt layer

Author: PierreRaybaut

README.md

@@ -82,6 +82,7 @@ for more details on API limitations when comparing to Qwt.
 ### Requirements ###
 - Python >=2.6 or Python >=3.2
 - PyQt4 >=4.4 or PyQt5 >= 5.5
+- QtPy
 - NumPy >= 1.5
 
 ## Installation

doc/installation.rst

@@ -7,6 +7,7 @@ Dependencies
 Requirements:
     * Python 2.x (x>=6) or 3.x (x>=2)
     * PyQt4 4.x (x>=3 ; recommended x>=4) or PyQt5 5.x (x>=5)
+    * QtPy
     * NumPy 1.x (x>=5)
     * Sphinx 1.x (x>=1) for documentation generation
 

doc/plot_example.py

@@ -1,7 +1,7 @@
 import qwt
 import numpy as np
 
-app = qwt.qt.QtGui.QApplication([])
+app = qtpy.QtGui.QApplication([])
 x = np.linspace(-10, 10, 500)
 plot = qwt.QwtPlot("Trigonometric functions")
 plot.insertLegend(qwt.QwtLegend(), qwt.QwtPlot.BottomLegend)

doc/symbol_path_example.py

@@ -1,5 +1,5 @@
-from qwt.qt.QtGui import QApplication, QPen, QPainterPath, QTransform
-from qwt.qt.QtCore import Qt, QPointF
+from qtpy.QtGui import QApplication, QPen, QPainterPath, QTransform
+from qtpy.QtCore import Qt, QPointF
 from qwt import QwtPlot, QwtPlotCurve, QwtSymbol
 import numpy as np
 import os.path as osp

qwt/__init__.py

@@ -33,37 +33,37 @@
 
 import warnings
 
-from .plot import QwtPlot
-from .symbol import QwtSymbol as QSbl  # see deprecated section
-from .scale_engine import QwtLinearScaleEngine, QwtLogScaleEngine
-from .text import QwtText
-from .plot_canvas import QwtPlotCanvas
-from .plot_curve import QwtPlotCurve as QPC  # see deprecated section
-from .plot_curve import QwtPlotItem
-from .scale_map import QwtScaleMap
-from .interval import QwtInterval
-from .legend import QwtLegend, QwtLegendData, QwtLegendLabel
-from .plot_marker import QwtPlotMarker
-from .plot_grid import QwtPlotGrid as QPG  # see deprecated section
-from .color_map import QwtLinearColorMap
-
-from .toqimage import array_to_qimage as toQImage
-
-from .scale_div import QwtScaleDiv
-from .scale_draw import QwtScaleDraw
-from .scale_draw import QwtAbstractScaleDraw
-from .painter import QwtPainter
-
-from .plot_series import (
+from qwt.plot import QwtPlot
+from qwt.symbol import QwtSymbol as QSbl  # see deprecated section
+from qwt.scale_engine import QwtLinearScaleEngine, QwtLogScaleEngine
+from qwt.text import QwtText
+from qwt.plot_canvas import QwtPlotCanvas
+from qwt.plot_curve import QwtPlotCurve as QPC  # see deprecated section
+from qwt.plot_curve import QwtPlotItem
+from qwt.scale_map import QwtScaleMap
+from qwt.interval import QwtInterval
+from qwt.legend import QwtLegend, QwtLegendData, QwtLegendLabel
+from qwt.plot_marker import QwtPlotMarker
+from qwt.plot_grid import QwtPlotGrid as QPG  # see deprecated section
+from qwt.color_map import QwtLinearColorMap
+
+from qwt.toqimage import array_to_qimage as toQImage
+
+from qwt.scale_div import QwtScaleDiv
+from qwt.scale_draw import QwtScaleDraw
+from qwt.scale_draw import QwtAbstractScaleDraw
+from qwt.painter import QwtPainter
+
+from qwt.plot_series import (
     QwtSeriesData,
     QwtPointArrayData,
     QwtSeriesStore,
     QwtPlotSeriesItem,
 )
 
-from .plot_renderer import QwtPlotRenderer
+from qwt.plot_renderer import QwtPlotRenderer
 
-from .plot_directpainter import QwtPlotDirectPainter
+from qwt.plot_directpainter import QwtPlotDirectPainter
 
 
 ## ============================================================================
@@ -127,7 +127,7 @@ def draw(self, painter, *args):
             "please rely on `drawSymbol` and `drawSymbols` instead",
             RuntimeWarning,
         )
-        from .qt.QtCore import QPointF
+        from qtpy.QtCore import QPointF
 
         if len(args) == 2:
             self.drawSymbols(painter, [QPointF(*args)])

qwt/_math.py

@@ -7,7 +7,7 @@
 
 from __future__ import division
 
-from .qt.QtCore import qFuzzyCompare
+from qtpy.QtCore import qFuzzyCompare
 
 import math
 

qwt/color_map.py

@@ -28,8 +28,8 @@
    :members:
 """
 
-from .qt.QtGui import QColor, qRed, qGreen, qBlue, qRgb, qRgba, qAlpha
-from .qt.QtCore import Qt, qIsNaN
+from qtpy.QtGui import QColor, qRed, qGreen, qBlue, qRgb, qRgba, qAlpha
+from qtpy.QtCore import Qt, qIsNaN
 
 
 class ColorStop(object):

qwt/column_symbol.py

@@ -5,10 +5,10 @@
 # Copyright (c) 2015 Pierre Raybaut, for the Python translation/optimization
 # (see LICENSE file for more details)
 
-from .interval import QwtInterval
+from qwt.interval import QwtInterval
 
-from .qt.QtGui import QPolygonF, QPalette
-from .qt.QtCore import QRectF, Qt
+from qtpy.QtGui import QPolygonF, QPalette
+from qtpy.QtCore import QRectF, Qt
 
 
 def qwtDrawBox(p, rect, pal, lw):

qwt/dyngrid_layout.py

@@ -15,8 +15,8 @@
    :members:
 """
 
-from .qt.QtGui import QLayout
-from .qt.QtCore import Qt, QRect, QSize
+from qtpy.QtWidgets import QLayout
+from qtpy.QtCore import Qt, QRect, QSize
 
 
 class QwtDynGridLayout_PrivateData(object):

qwt/graphic.py

@@ -13,18 +13,18 @@
    :members:
 """
 
-from .null_paintdevice import QwtNullPaintDevice
-from .painter_command import QwtPainterCommand
+from qwt.null_paintdevice import QwtNullPaintDevice
+from qwt.painter_command import QwtPainterCommand
 
-from .qt.QtGui import (
+from qtpy.QtGui import (
     QPainter,
     QPainterPathStroker,
     QPaintEngine,
     QPixmap,
     QTransform,
     QImage,
 )
-from .qt.QtCore import Qt, QRectF, QSizeF, QSize, QPointF, QRect
+from qtpy.QtCore import Qt, QRectF, QSizeF, QSize, QPointF, QRect
 
 import numpy as np