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

NAME
       qwtchangelog - What's new in Qwt 6.2


Qt >= 4.8
       Support for Qt < Qt 4.8 has been dropped, support for Qt6 has been
       added.

Includes
       Include files, that match the class names are available now. So it is
       possible to write '#include <QwtPlot>' now instead of 'include
       qwt_plot.h'

QwtPolar has become part of Qwt
       The QwtPolar project ( https://qwtpolar.sourceforge.io ) has been
       integrated into Qwt.

MathML Text Renderer has become its own project
       The code can be found at https://github.com/uwerat/qwt-mml-dev now and
       is intended to become a standalone lib.

Spline
       The broken implementation of QwtSpline has been replaced by a bunch of
       classes offering all sort of functionalities around splines.

       The most popular spline approximation/interpolation algos have been
       implemented:

       - Basis
       - Cardinal
       - ParabolicBlending
       - Akima
       - The one used in a proprietory office package
       - Cubic


Better OpenGL support
       QwtPlotOpenGLCanvas added to support rendering to a QOpenGLWidget

New plot items
       - QwtPlotVectorField
         A new type of plot item for vector fields

       - QwtPlotGraphicItem
         An item displaying a QwtGraphic image ( f.e used by QwtPlotSvgItem )

QwtPlotCurve
       - QwtPlotCurve::FilterPointsAggressive
         A fast weeding algo for huge datasets with increasing x or y values

       - QwtPlotCurve::closestPoint
         Is virtual now

       - Line Clipping
         Includes the painter clip now

       - QwtValuePointData
         A new type of data added, where the x values are the index

       - QwtPlotCurve::setSamples
         more type of setters

QwtPlotSpectrogram
       - QwtPlotSpectrogram::setColorTableSize
         Using individual RGB tables

       - QwtRasterData::setInterval/interval
         API cleanup

       - QwtHueColorMap, QwtSaturationValueColorMap
         New type of color maps

       - QwtMatrixRasterData::BicubicInterpolation
         Implementation of bicubic interpolation added

       - Handling of NaN values
         NaN values are interpreted as gaps, when QwtRasterData::WithoutGaps
         is not set

Other changes
       - QwtPlotRenderer
         Using QPdfWriter instead of QPrinter, where possible

       - Handling of Unknown Paint Engines
         Not aligning unknown paint engines ( f.e EMF ), QwtNullPaintDevice is not using
         QPaintEngine::User anymore

       - QwtTransform::LogMin/LogMax
         LOG_MIN/LOG_MAX have been reomed ( values differ !

       - qwt_compat.h
         Removed

       - qwtFuzzyGreaterOrEqual/qwtFuzzyLessOrEqual
         Removed

       - qwtGetMin/qwtGetMax
         Removed

Version 6.2.0                   Sun Jul 18 2021                qwtchangelog(3)