133 lines
3.7 KiB
C++
133 lines
3.7 KiB
C++
/*****************************************************************************
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* Qwt Examples - Copyright (C) 2002 Uwe Rathmann
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* This file may be used under the terms of the 3-clause BSD License
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*****************************************************************************/
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#include "MainWindow.h"
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#include "Plot.h"
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#include "TransformPlot.h"
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#include <QwtTransform>
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#include <QwtMath>
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#include <QSplitter>
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namespace
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{
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class TransformPos : public QwtTransform
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{
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public:
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TransformPos( double pos, double range, double factor )
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: m_position( pos )
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, m_range( range )
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, m_factor( factor )
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, m_powRange( std::pow( m_range, m_factor ) )
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{
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}
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virtual double transform( double value ) const QWT_OVERRIDE
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{
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const double v1 = m_position - m_range;
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const double v2 = v1 + 2 * m_range;
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if ( value <= v1 )
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{
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return value;
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}
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if ( value >= v2 )
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{
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return v1 + 2 * m_powRange + value - v2;
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}
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double v;
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if ( value <= m_position )
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{
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v = v1 + std::pow( value - v1, m_factor );
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}
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else
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{
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v = v1 + 2 * m_powRange - std::pow( v2 - value, m_factor );
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}
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return v;
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}
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virtual double invTransform( double value ) const QWT_OVERRIDE
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{
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const double v1 = m_position - m_range;
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const double v2 = v1 + 2 * m_powRange;
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if ( value < v1 )
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{
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return value;
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}
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if ( value >= v2 )
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{
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return value + 2 * ( m_range - m_powRange );
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}
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double v;
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if ( value <= v1 + m_powRange )
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{
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v = v1 + std::pow( value - v1, 1.0 / m_factor );
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}
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else
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{
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v = m_position + m_range - std::pow( v2 - value, 1.0 / m_factor );
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}
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return v;
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}
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virtual QwtTransform* copy() const QWT_OVERRIDE
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{
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return new TransformPos( m_position, m_range, m_factor );
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}
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private:
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const double m_position;
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const double m_range;
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const double m_factor;
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const double m_powRange;
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};
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}
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MainWindow::MainWindow( QWidget* parent ):
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QMainWindow( parent )
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{
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QSplitter* splitter = new QSplitter( Qt::Vertical );
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m_transformPlot = new TransformPlot( splitter );
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m_transformPlot->insertTransformation( "Square Root",
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QColor( "DarkSlateGray" ), new QwtPowerTransform( 0.5 ) );
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m_transformPlot->insertTransformation( "Linear",
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QColor( "Peru" ), new QwtNullTransform() );
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m_transformPlot->insertTransformation( "Cubic",
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QColor( "OliveDrab" ), new QwtPowerTransform( 3.0 ) );
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m_transformPlot->insertTransformation( "Power 10",
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QColor( "Indigo" ), new QwtPowerTransform( 10.0 ) );
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m_transformPlot->insertTransformation( "Log",
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QColor( "SteelBlue" ), new QwtLogTransform() );
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m_transformPlot->insertTransformation( "At 400",
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QColor( "Crimson" ), new TransformPos( 400.0, 100.0, 1.4 ) );
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const QwtPlotItemList curves =
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m_transformPlot->itemList( QwtPlotItem::Rtti_PlotCurve );
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if ( !curves.isEmpty() )
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m_transformPlot->setLegendChecked( curves[ 2 ] );
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m_plot = new Plot( splitter );
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m_plot->setTransformation( new QwtPowerTransform( 3.0 ) );
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setCentralWidget( splitter );
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connect( m_transformPlot, SIGNAL(selected(QwtTransform*)),
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m_plot, SLOT(setTransformation(QwtTransform*)) );
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}
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#include "moc_MainWindow.cpp"
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