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examples/polarspectrogram/PlotWindow.cpp

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+/*****************************************************************************
+ * Qwt Polar Examples - Copyright (C) 2008   Uwe Rathmann
+ * This file may be used under the terms of the 3-clause BSD License
+ *****************************************************************************/
+
+#include "Plot.h"
+#include "PlotWindow.h"
+
+#include <QwtScaleEngine>
+#include <QwtRasterData>
+#include <QwtPolarSpectrogram>
+#include <QwtScaleWidget>
+#include <QwtColorMap>
+
+#include <QLayout>
+
+namespace
+{
+    class ColorMap : public QwtLinearColorMap
+    {
+      public:
+        ColorMap()
+            : QwtLinearColorMap( Qt::darkBlue, Qt::yellow )
+        {
+#if 1
+            addColorStop( 0.00, Qt::black );
+            addColorStop( 0.05, Qt::darkRed );
+#else
+            addColorStop( 0.05, Qt::blue );
+#endif
+            addColorStop( 0.3, Qt::cyan );
+            addColorStop( 0.6, Qt::green );
+            addColorStop( 0.98, Qt::red );
+        }
+    };
+}
+
+PlotWindow::PlotWindow( QWidget* parent )
+    : QWidget( parent )
+{
+    m_plot = new Plot();
+
+    m_colorScale = new QwtScaleWidget();
+    m_colorScale->setAlignment( QwtScaleDraw::RightScale );
+    m_colorScale->setColorBarEnabled( true );
+
+    QwtText title( "Intensity" );
+    QFont font = m_colorScale->font();
+    font.setBold( true );
+    title.setFont( font );
+    m_colorScale->setTitle( title );
+
+    const QwtInterval interval =
+        m_plot->spectrogram()->data()->interval( Qt::ZAxis );
+
+    m_colorScale->setColorMap( interval, new ColorMap() );
+    m_plot->spectrogram()->setColorMap( new ColorMap() );
+
+    QwtLinearScaleEngine scaleEngine;
+    m_colorScale->setScaleDiv(
+        scaleEngine.divideScale( interval.minValue(), interval.maxValue(), 8, 5 ) );
+
+    int startDist, endDist;
+    m_colorScale->getBorderDistHint( startDist, endDist );
+    m_colorScale->setBorderDist( startDist, endDist );
+
+    QHBoxLayout* layout = new QHBoxLayout( this );
+    layout->addWidget( m_plot, 10 );
+    layout->addWidget( m_colorScale, 10 );
+}