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&#160;<span id="projectnumber">6.2.0</span>
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<div class="title">What's new in Qwt 6.2 </div> </div>
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<div class="toc"><h3>Table of Contents</h3>
<ul><li class="level1"><a href="#PLATFORM">Qt &gt;= 4.8</a></li>
<li class="level1"><a href="#Class">Includes</a></li>
<li class="level1"><a href="#POLAR">QwtPolar has become part of Qwt</a></li>
<li class="level1"><a href="#MATHML">MathML Text Renderer has become its own project</a></li>
<li class="level1"><a href="#SPLINES">Spline</a></li>
<li class="level1"><a href="#OPENGL">Better OpenGL support</a></li>
<li class="level1"><a href="#ITEMS">New plot items</a></li>
<li class="level1"><a href="#CURVE">QwtPlotCurve</a></li>
<li class="level1"><a href="#SPECTROGRAM">QwtPlotSpectrogram</a></li>
<li class="level1"><a href="#OTHERS">Other changes</a></li>
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<div class="textblock"><h1><a class="anchor" id="PLATFORM"></a>
Qt &gt;= 4.8</h1>
<p>Support for Qt &lt; Qt 4.8 has been dropped, support for Qt6 has been added.</p>
<h1><a class="anchor" id="Class"></a>
Includes</h1>
<p>Include files, that match the class names are available now. So it is possible to write "#include &lt;QwtPlot&gt;" now instead of "include qwt_plot.h"</p>
<h1><a class="anchor" id="POLAR"></a>
QwtPolar has become part of Qwt</h1>
<p>The QwtPolar project ( <a href="https://qwtpolar.sourceforge.io">https://qwtpolar.sourceforge.io</a> ) has been integrated into Qwt.</p>
<h1><a class="anchor" id="MATHML"></a>
MathML Text Renderer has become its own project</h1>
<p>The code can be found at <a href="https://github.com/uwerat/qwt-mml-dev">https://github.com/uwerat/qwt-mml-dev</a> now and is intended to become a standalone lib.</p>
<h1><a class="anchor" id="SPLINES"></a>
Spline</h1>
<p>The broken implementation of <a class="el" href="class_qwt_spline.html" title="Base class for all splines.">QwtSpline</a> has been replaced by a bunch of classes offering all sort of functionalities around splines.</p>
<p>The most popular spline approximation/interpolation algos have been implemented: </p><pre class="fragment">- Basis
- Cardinal
- ParabolicBlending
- Akima
- The one used in a proprietory office package
- Cubic
</pre> <h1><a class="anchor" id="OPENGL"></a>
Better OpenGL support</h1>
<p><a class="el" href="class_qwt_plot_open_g_l_canvas.html" title="An alternative canvas for a QwtPlot derived from QOpenGLWidget.">QwtPlotOpenGLCanvas</a> added to support rendering to a QOpenGLWidget</p>
<h1><a class="anchor" id="ITEMS"></a>
New plot items</h1>
<pre class="fragment">- QwtPlotVectorField
A new type of plot item for vector fields
- QwtPlotGraphicItem
An item displaying a QwtGraphic image ( f.e used by QwtPlotSvgItem )
</pre> <h1><a class="anchor" id="CURVE"></a>
QwtPlotCurve</h1>
<pre class="fragment">- 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
</pre> <h1><a class="anchor" id="SPECTROGRAM"></a>
QwtPlotSpectrogram</h1>
<pre class="fragment">- 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
</pre> <h1><a class="anchor" id="OTHERS"></a>
Other changes</h1>
<pre class="fragment">- 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
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