.TH "qwtchangelog" 3 "Sun Jul 18 2021" "Version 6.2.0" "Qwt User's Guide" \" -*- nroff -*-
.ad l
.nh
.SH NAME
qwtchangelog \- What's new in Qwt 6\&.2 

.SH "Qt >= 4\&.8"
.PP
Support for Qt < Qt 4\&.8 has been dropped, support for Qt6 has been added\&.
.SH "Includes"
.PP
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'
.SH "QwtPolar has become part of Qwt"
.PP
The QwtPolar project ( https://qwtpolar.sourceforge.io ) has been integrated into Qwt\&.
.SH "MathML Text Renderer has become its own project"
.PP
The code can be found at https://github.com/uwerat/qwt-mml-dev now and is intended to become a standalone lib\&.
.SH "Spline"
.PP
The broken implementation of \fBQwtSpline\fP has been replaced by a bunch of classes offering all sort of functionalities around splines\&.
.PP
The most popular spline approximation/interpolation algos have been implemented: 
.PP
.nf
- Basis
- Cardinal
- ParabolicBlending
- Akima
- The one used in a proprietory office package
- Cubic

.fi
.PP
 
.SH "Better OpenGL support"
.PP
\fBQwtPlotOpenGLCanvas\fP added to support rendering to a QOpenGLWidget
.SH "New plot items"
.PP
.PP
.nf
- QwtPlotVectorField
  A new type of plot item for vector fields

- QwtPlotGraphicItem
  An item displaying a QwtGraphic image ( f.e used by QwtPlotSvgItem )
.fi
.PP
 
.SH "QwtPlotCurve"
.PP
.PP
.nf
- 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
.fi
.PP
 
.SH "QwtPlotSpectrogram"
.PP
.PP
.nf
- 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
.fi
.PP
 
.SH "Other changes"
.PP
.PP
.nf
- 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
.fi
.PP