1qwtchangelog(3)                Qwt User's Guide                qwtchangelog(3)
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NAME

6       qwtchangelog - What's new in Qwt 6.2
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Qt >= 4.8

10       Support for Qt < Qt 4.8 has been dropped, support for Qt6 has been
11       added.
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Includes

14       Include files, that match the class names are available now. So it is
15       possible to write '#include <QwtPlot>' now instead of 'include
16       qwt_plot.h'
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QwtPolar has become part of Qwt

19       The QwtPolar project ( https://qwtpolar.sourceforge.io ) has been
20       integrated into Qwt.
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MathML Text Renderer has become its own project

23       The code can be found at https://github.com/uwerat/qwt-mml-dev now and
24       is intended to become a standalone lib.
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Spline

27       The broken implementation of QwtSpline has been replaced by a bunch of
28       classes offering all sort of functionalities around splines.
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30       The most popular spline approximation/interpolation algos have been
31       implemented:
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33       - Basis
34       - Cardinal
35       - ParabolicBlending
36       - Akima
37       - The one used in a proprietory office package
38       - Cubic
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Better OpenGL support

42       QwtPlotOpenGLCanvas added to support rendering to a QOpenGLWidget
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New plot items

45       - QwtPlotVectorField
46         A new type of plot item for vector fields
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48       - QwtPlotGraphicItem
49         An item displaying a QwtGraphic image ( f.e used by QwtPlotSvgItem )
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QwtPlotCurve

52       - QwtPlotCurve::FilterPointsAggressive
53         A fast weeding algo for huge datasets with increasing x or y values
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55       - QwtPlotCurve::closestPoint
56         Is virtual now
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58       - Line Clipping
59         Includes the painter clip now
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61       - QwtValuePointData
62         A new type of data added, where the x values are the index
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64       - QwtPlotCurve::setSamples
65         more type of setters
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QwtPlotSpectrogram

68       - QwtPlotSpectrogram::setColorTableSize
69         Using individual RGB tables
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71       - QwtRasterData::setInterval/interval
72         API cleanup
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74       - QwtHueColorMap, QwtSaturationValueColorMap
75         New type of color maps
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77       - QwtMatrixRasterData::BicubicInterpolation
78         Implementation of bicubic interpolation added
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80       - Handling of NaN values
81         NaN values are interpreted as gaps, when QwtRasterData::WithoutGaps
82         is not set
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Other changes

85       - QwtPlotRenderer
86         Using QPdfWriter instead of QPrinter, where possible
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88       - Handling of Unknown Paint Engines
89         Not aligning unknown paint engines ( f.e EMF ), QwtNullPaintDevice is not using
90         QPaintEngine::User anymore
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92       - QwtTransform::LogMin/LogMax
93         LOG_MIN/LOG_MAX have been reomed ( values differ !
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95       - qwt_compat.h
96         Removed
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98       - qwtFuzzyGreaterOrEqual/qwtFuzzyLessOrEqual
99         Removed
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101       - qwtGetMin/qwtGetMax
102         Removed
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104Version 6.2.0                   Sun Jul 18 2021                qwtchangelog(3)