Qt >= 4.8
Support for Qt < Qt 4.8 has been dropped, support for Qt6 has been added.
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.
The broken implementation of QwtSpline has been replaced by a bunch of classes offering all sort of functionalities around splines.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::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::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
- 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