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#include <qlabel.h>
#include <qlayout.h>
#include <qwt_knob.h>
#include <qwt_scale_engine.h>
#include <qwt_transform.h>
#include "knobbox.h"
KnobBox::KnobBox( QWidget *parent, int knobType ):
QWidget( parent )
{
d_knob = createKnob( knobType );
d_knob->setKnobWidth( 100 );
d_label = new QLabel( this );
d_label->setAlignment( Qt::AlignCenter );
QVBoxLayout *layout = new QVBoxLayout( this );;
layout->setSpacing( 0 );
layout->addWidget( d_knob, 10 );
layout->addWidget( d_label );
layout->addStretch( 10 );
connect( d_knob, SIGNAL( valueChanged( double ) ),
this, SLOT( setNum( double ) ) );
setNum( d_knob->value() );
}
QwtKnob *KnobBox::createKnob( int knobType ) const
{
QwtKnob *knob = new QwtKnob();
knob->setTracking( true );
switch( knobType )
{
case 0:
{
knob->setKnobStyle( QwtKnob::Sunken );
knob->setMarkerStyle( QwtKnob::Nub );
knob->setWrapping( true );
knob->setNumTurns( 4 );
knob->setScaleStepSize( 10.0 );
knob->setScale( 0, 400 );
knob->setTotalSteps( 400 );
break;
}
case 1:
{
knob->setKnobStyle( QwtKnob::Sunken );
knob->setMarkerStyle( QwtKnob::Dot );
break;
}
case 2:
{
knob->setKnobStyle( QwtKnob::Sunken );
knob->setMarkerStyle( QwtKnob::Tick );
QwtLinearScaleEngine *scaleEngine = new QwtLinearScaleEngine( 2 );
scaleEngine->setTransformation( new QwtPowerTransform( 2 ) );
knob->setScaleEngine( scaleEngine );
QList< double > ticks[ QwtScaleDiv::NTickTypes ];
ticks[ QwtScaleDiv::MajorTick ] << 0 << 4
<< 16 << 32 << 64 << 96 << 128;
ticks[ QwtScaleDiv::MediumTick ] << 24 << 48 << 80 << 112;
ticks[ QwtScaleDiv::MinorTick ]
<< 0.5 << 1 << 2
<< 7 << 10 << 13
<< 20 << 28
<< 40 << 56
<< 72 << 88
<< 104 << 120;
knob->setScale( QwtScaleDiv( 0, 128, ticks ) );
knob->setTotalSteps( 100 );
knob->setStepAlignment( false );
knob->setSingleSteps( 1 );
knob->setPageSteps( 5 );
break;
}
case 3:
{
knob->setKnobStyle( QwtKnob::Flat );
knob->setMarkerStyle( QwtKnob::Notch );
knob->setScaleEngine( new QwtLogScaleEngine() );
knob->setScaleStepSize( 1.0 );
knob->setScale( 0.1, 1000.0 );
knob->setScaleMaxMinor( 10 );
break;
}
case 4:
{
knob->setKnobStyle( QwtKnob::Raised );
knob->setMarkerStyle( QwtKnob::Dot );
knob->setWrapping( true );
break;
}
case 5:
{
knob->setKnobStyle( QwtKnob::Styled );
knob->setMarkerStyle( QwtKnob::Triangle );
knob->setTotalAngle( 180.0 );
knob->setScale( 100, -100 );
break;
}
}
return knob;
}
void KnobBox::setNum( double v )
{
QString text;
text.setNum( v, 'f', 2 );
d_label->setText( text );
}
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