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PythonQwt Releases

Version 0.12.7

  • Fixed random crashes (segfaults) on Linux related to conflicts between Qt and Python reference counting mechanisms:
    • This issue was only happening on Linux, and only with Python 3.12, probably due to changes in Python garbage collector behavior introduced in Python 3.12. Moreover, it was only triggered with an extensive test suite, such as the one provided by the PlotPy project.
    • The solution was to derive all private classes containing Qt objects from QObject instead of object, in order to let Qt manage the reference counting of its objects.
    • This change was applied to the following classes:
      • QwtLinearColorMap_PrivateData
      • QwtColumnSymbol_PrivateData
      • QwtDynGridLayout_PrivateData
      • QwtGraphic_PrivateData
      • QwtLegendLabel_PrivateData
      • QwtNullPaintDevice_PrivateData
      • QwtPlotCanvas_PrivateData
      • QwtPlotDirectPainter_PrivateData
      • QwtPlotGrid_PrivateData
      • QwtPlotLayout_PrivateData
      • QwtPlotMarker_PrivateData
      • QwtPlotRenderer_PrivateData
      • QwtPlot_PrivateData
      • QwtAbstractScaleDraw_PrivateData
      • QwtScaleDraw_PrivateData
      • QwtScaleWidget_PrivateData
      • QwtSymbol_PrivateData
      • QwtText_PrivateData
  • Removed deprecated code regarding PyQt4 compatibility

Version 0.12.6

  • Fixed random crashes (segfaults) on Linux related to Qt objects stored in cache data structures (QwtText and QwtSymbol)

  • Test suite can simply be run with pytest and specific configuration (conftest.py) will be taken into account (previously, the test suite has to be run with pytest qwt in order to be successfully configured)

Version 0.12.5

  • Add support for NumPy 2.0:
    • Use numpy.asarray instead of numpy.array(..., copy=False)
    • Update requirements to remove the NumPy version upper bound constraint

Version 0.12.4

  • Fixed segmentation fault issue reported in the PlotPy project:
    • See PlotPy's Issue #13 for the original issue.
    • The issue was caused by the QwtSymbol class constructor, and more specifically by its private data object, which instanciated an empty QtPainterPath object, causing a segmentation fault on Linux, Python 3.12 and PyQt5.

Version 0.12.3

  • Fixed Fatal Python error issue reported in the PlotPy project:
    • See PlotPy's Issue #11 for the original issue, even if the problem is not directly pointed out in the issue comments.
    • The issue was caused by the QwtAbstractScaleDraw cache mechanism, which was keeping references to QSizeF objects that were deleted by the garbage collector at some point. This was causing a segmentation fault, but only on Linux, and only when executing the PlotPy test suite in a specific order.
    • Thanks to @yuzibo for helping to reproduce the issue and providing a test case, that is the PlotPy Debian package build process.

Version 0.12.2

For this release, test coverage is 72%.

  • Preparing for NumPy V2 compatibility: this is a work in progress, as NumPy V2 is not yet released. In the meantime, requirements have been updated to exclude NumPy V2.
  • Fix QwtPlot.axisInterval (was raising AttributeError)
  • Removed unnecessary dependencies (pytest-qt, pytest-cov)
  • Moved conftest.py to project root
  • Project code formatting: using ruff instead of black and isort

Version 0.12.1

  • Fixed ColorStops.stops method (was returning a copy of the list of stops instead of the list itself)

Version 0.12.0

  • 30% performance improvement (measured by qwt.tests.test_loadtest) by optimizing the QwtAbstractScaleDraw.tickLabel method:
    • Suppressed an unnecessary call to QFont.textSize (which can be quite slow)
    • Cached the text size with the label QwtText object
  • Added support for margins in QwtPlot (see Issue #82):
    • Default margins are set to 0.05 (5% of the plot area) at each side of the plot
    • Margins are adjustable for each plot axis using QwtPlot.setAxisMargin (and QwtPlot.axisMargin to get the current value)
  • Added an additional margin to the left of ticks labels: this margin is set to one character width, to avoid the labels to be truncated while keeping a tight layout
  • Slighly improved the new flat style (see V0.7.0) by selecting default fonts
  • API breaking change: QwtLinearColorMap.colorStops now returns a list of ColorStop objects instead of the list of stop values

Version 0.11.2

  • Fixed TypeError on QwtPlotLayout.minimumSizeHint

Version 0.11.1

  • Fixed remaining QwtPainter.drawPixmap call

Version 0.11.0

  • Dropped support for Python 3.7 and earlier
  • Dropped support for PyQt4 and PySide2
  • Removed unnecessary argument numPoints in QwtSymbol.drawSymbols and QwtSymbol.renderSymbols methods
  • QwtPlotCanvas: fixed BackingStore feature (paintAttribute)

Version 0.10.6

  • Qt6 support:
    • Handled all occurences of deprecated QWidget.getContentsMargins method.
    • Removed references to NonCosmeticDefaultPen
    • Fixed QApplication.desktop AttributeError
    • Fixed QPrinter.HighResolution AttributeError on Linux
    • Fixed QPrinter.setColorMode AttributeError on PyQt6/Linux
    • Fixed QPrinter.setOrientation deprecation issue
    • Fixed QPrinter.setPaperSize deprecation issue
  • Improved unit tests:
    • Ensure that tests are entirely executed before quitting (in unattended mode)
    • Added more tests on qwt.symbols
    • Added tests on qwt.plot_renderer
  • qwt.plot_renderer: fixed resolution type
  • qwt.symbols: fixed QPointF type mismatch
  • Removed CHM help file generation (obsolete)

Version 0.10.5

  • Issue #81 - Signal disconnection issue with PySide 6.5.3

Version 0.10.4

  • Issue #80 - Print to PDF: AttributeError: 'NoneType' object has no attribute 'getContentsMargins'

Version 0.10.3

  • Issue #79 - TypeError: unexpected type 'QSize' (thanks to @luc-j-bourhis)

  • Moved project to the PlotPyStack organization.

  • Unit tests: added support for pytest and coverage (60% coverage as of today)

  • Issue #74 - TypeError: QwtPlotDict.init() [...] with PySide 6.5.0

  • Issue #77 - AttributeError: 'XXX' object has no attribute '_QwtPlot__data'

  • Issue #72 - AttributeError: 'QwtScaleWidget' object has no attribute 'maxMajor' / 'maxMinor' / 'stepSize'

  • Issue #76 - [PySide] AttributeError: 'QwtPlotCanvas' object has no attribute 'Sunken'

  • Issue #63 - TypeError: 'PySide2.QtCore.QRect' object is not subscriptable

Version 0.10.2

  • Fixed type mismatch issues on Linux

Version 0.10.1

  • Added support for PyQt6.

Version 0.10.0

  • Added support for QtPy 2 and PySide6.
  • Dropped support for Python 2.

Version 0.9.2

  • Curve plotting: added support for numpy.float32 data type.

Version 0.9.1

  • Added load test showing a large number of plots (eventually highlights performance issues).
  • Fixed event management in QwtPlot and removed unnecessary QEvent.LayoutRequest emission in QwtScaleWidget (caused high CPU usage with guiqwt.ImageWidget).
  • QwtScaleDiv: fixed ticks initialization when passing all arguments to constructor.
  • tests/image.py: fixed overriden updateLegend signature.

Version 0.9.0

  • QwtPlot: set the autoReplot option at False by default, to avoid time consuming implicit plot updates.
  • Added QwtPlotItem.setIcon and QwtPlotItem.icon method for setting and getting the icon associated to the plot item (as of today, this feature is not strictly needed in PythonQwt: this has been implemented for several use cases in higher level libraries (see PR #61).
  • Removed unused QwtPlotItem.defaultIcon method.
  • Added various minor optimizations for axes/ticks drawing features.
  • Fixed QwtPlot.canvasMap when axisScaleDiv returns None.
  • Fixed alias np.float which is deprecated in NumPy 1.20.

Version 0.8.3

  • Fixed simple plot examples (setup.py & plot.py's doc page) following the introduction of the new QtPy dependency (Qt compatibility layer) since V0.8.0.

Version 0.8.2

  • Added new GUI-based test script PythonQwt-py3 to run the test launcher.
  • Added command-line options to the PythonQwt-tests-py3 script to run all the tests simultenously in unattended mode (--mode unattended) or to update all the screenshots (--mode screenshots).
  • Added internal scripts for automated test in virtual environments with both PyQt5 and PySide2.

Version 0.8.1

  • PySide2 support was significatively improved betwen PythonQwt V0.8.0 and V0.8.1 thanks to the new qwt.qwt_curve.array2d_to_qpolygonf function.

Version 0.8.0

  • Added PySide2 support: PythonQwt is now compatible with Python 2.7, Python 3.4+, PyQt4, PyQt5 and PySide2!

Version 0.7.1

  • Changed QwtPlotItem.detachItems signature: removed unnecessary "autoDelete" argument, initialiazing "rtti" argument to None (remove all items)
  • Improved Qt universal support (PyQt5, ...)

Version 0.7.0

  • Added convenience functions for creating usual objects (curve, grid, marker, ...):

    • QwtPlotCurve.make
    • QwtPlotMarker.make
    • QwtPlotGrid.make
    • QwtSymbol.make
    • QwtText.make

  • Added new test launcher with screenshots (automatically generated)

  • Removed guidata dependency thanks to the new specific GUI-based test launcher

  • Updated documentation (added more examples, using automatically generated screenshots)

  • QwtPlot: added "flatStyle" option, a PythonQwt-exclusive feature improving default plot style (without margin, more compact and flat look) -- option is enabled by default

  • QwtAbstractScaleDraw: added option to set the tick color lighter factor for each tick type (minor, medium, major) -- this feature is used with the new flatStyle option

  • Fixed obvious errors (+ poor implementations) in untested code parts

  • Major code cleaning and formatting

Version 0.6.2

  • Fixed Python crash occuring at exit when deleting objects (Python 3 only)

  • Moved documentation to https://docs.readthedocs.io/

  • Added unattended tests with multiple versions of WinPython:

    • WinPython-32bit-2.7.6.4
    • WinPython-64bit-2.7.6.4
    • WinPython-64bit-3.4.4.3
    • WinPython-64bit-3.4.4.3Qt5
    • WPy64-3680
    • WPy64-3771
    • WPy64-3830

  • Added PyQt4/PyQt5/PySide automatic switch depending on installed libraries

Version 0.6.1

  • Fixed rounding issue with PythonQwt scale engine (0...1000 is now divided in 200-size steps, as in both Qwt and PyQwt)
  • Removed unnecessary mask on scaleWidget (this closes #35)
  • CurveBenchmark.py: fixed TypeError with numpy.linspace (NumPy=1.18)

Version 0.6.0

  • Ported changes from Qwt 6.1.2 to Qwt 6.1.5
  • QwtPlotCanvas.setPaintAttribute: fixed PyQt4 compatibility issue for BackingStore paint attribute
  • Fixed DataDemo.py test script (was crashing ; this closes #41)
  • QwtPainterClass.drawBackground: fixed obvious bug in untested code (this closes #51)
  • qwtFillBackground: fixed obvious bug in untested code (this closes #50)
  • QwtPainterClass.fillPixmap: fixed obvious bug in untested code (this closes #49)
  • QwtStyleSheetRecorder: fixed obvious bug in untested code (this closes #47, closes #48 and closes #52)
  • Added "plot without margins" test for Issue #35

Version 0.5.5

  • QwtScaleMap.invTransform_scalar: avoid divide by 0
  • Avoid error when computing ticks: when the axis was so small that no tick could be drawn, an exception used to be raised

Version 0.5.4

Fixed an annoying bug which caused scale widget (axis ticks in particular) to be misaligned with canvas grid: the user was forced to resize the plot widget as a workaround

Version 0.5.3

  • Better handling of infinity and NaN values in scales (removed NumPy warnings)
  • Now handling infinity and NaN values in series data: removing points that can't be drawn
  • Fixed logarithmic scale engine: presence of values <= 0 was slowing down series data plotting

Version 0.5.2

  • Added CHM documentation to wheel package
  • Fixed QwtPlotRenderer.setDiscardFlag/setLayoutFlag args
  • Fixed QwtPlotItem.setItemInterest args
  • Fixed QwtPlot.setAxisAutoScale/setAutoReplot args

Version 0.5.1

  • Fixed Issue #22: fixed scale issues in CurveDemo2.py and ImagePlotDemo.py
  • QwtPlotCurve: sticks were not drawn correctly depending on orientation
  • QwtInterval: avoid overflows with NumPy scalars
  • Fixed Issue #28: curve shading was broken since v0.5.0
  • setup.py: using setuptools "entry_points" instead of distutils "scripts"
  • Showing curves/plots number in benchmarks to avoid any misinterpretation (see Issue #26)
  • Added Python2/Python3 scripts for running tests

Version 0.5.0

  • Various optimizations
  • Major API simplification, taking into account the feature that won't be implemented (fitting, rounding, weeding out points, clipping, etc.)
  • Added QwtScaleDraw.setLabelAutoSize/labelAutoSize methods to set the new auto size option (see documentation)
  • QwtPainter: removed unused methods drawRoundFrame, drawImage and drawPixmap

Version 0.4.0

  • Color bar: fixed axis ticks shaking when color bar is enabled
  • Fixed QwtPainter.drawColorBar for horizontal color bars (typo)
  • Restored compatibility with original Qwt signals (QwtPlot, ...)

Version 0.3.0

Renamed the project (python-qwt --> PythonQwt), for various reasons.

Version 0.2.1

Fixed Issue #23: "argument numPoints is not implemented" error was showing up when calling QwtSymbol.drawSymbol(symbol, QPoint(x, y)).

Version 0.2.0

Added docstrings in all Python modules and a complete documentation based on Sphinx. See the Overview section for API limitations when comparing to Qwt.

Version 0.1.1

Fixed Issue #21 (blocking issue only on non-Windows platforms when building the package): typo in "PythonQwt-tests" script name (in setup script)

Version 0.1.0

First alpha public release.