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#include "transformplot.h"
#include <qwt_curve_fitter.h>
#include <qwt_plot_curve.h>
#include <qwt_point_data.h>
#include <qwt_transform.h>
#include <qwt_legend.h>
#include <qwt_legend_label.h>
class TransformData: public QwtSyntheticPointData
{
public:
TransformData( QwtTransform *transform ):
QwtSyntheticPointData( 200 ),
d_transform( transform )
{
}
virtual ~TransformData()
{
delete d_transform;
}
const QwtTransform *transform() const
{
return d_transform;
}
virtual double y( double x ) const
{
const double min = 10.0;
const double max = 1000.0;
const double value = min + x * ( max - min );
const double s1 = d_transform->transform( min );
const double s2 = d_transform->transform( max );
const double s = d_transform->transform( value );
return ( s - s1 ) / ( s2 - s1 );
}
private:
QwtTransform *d_transform;
};
TransformPlot::TransformPlot( QWidget *parent ):
QwtPlot( parent )
{
setTitle( "Transformations" );
setCanvasBackground( Qt::white );
setAxisScale( QwtPlot::xBottom, 0.0, 1.0 );
setAxisScale( QwtPlot::yLeft, 0.0, 1.0 );
QwtLegend *legend = new QwtLegend();
legend->setDefaultItemMode( QwtLegendData::Checkable );
insertLegend( legend, QwtPlot::RightLegend );
connect( legend, SIGNAL( checked( const QVariant &, bool, int ) ),
this, SLOT( legendChecked( const QVariant &, bool ) ) );
}
void TransformPlot::insertTransformation(
const QString &title, const QColor &color, QwtTransform *transform )
{
QwtPlotCurve *curve = new QwtPlotCurve( title );
curve->setRenderHint( QwtPlotItem::RenderAntialiased, true );
curve->setPen( color, 2 );
curve->setData( new TransformData( transform ) );
curve->attach( this );
}
void TransformPlot::legendChecked( const QVariant &itemInfo, bool on )
{
QwtPlotItem *plotItem = infoToItem( itemInfo );
setLegendChecked( plotItem );
if ( on && plotItem->rtti() == QwtPlotItem::Rtti_PlotCurve )
{
QwtPlotCurve *curve = static_cast<QwtPlotCurve *>( plotItem );
TransformData *curveData = static_cast<TransformData *>( curve->data() );
Q_EMIT selected( curveData->transform()->copy() );
}
}
void TransformPlot::setLegendChecked( QwtPlotItem *plotItem )
{
const QwtPlotItemList items = itemList();
for ( int i = 0; i < items.size(); i++ )
{
QwtPlotItem *item = items[ i ];
if ( item->testItemAttribute( QwtPlotItem::Legend ) )
{
QwtLegend *lgd = qobject_cast<QwtLegend *>( legend() );
QwtLegendLabel *label = qobject_cast< QwtLegendLabel *>(
lgd->legendWidget( itemToInfo( item ) ) );
if ( label )
{
lgd->blockSignals( true );
label->setChecked( item == plotItem );
lgd->blockSignals( false );
}
}
}
}
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