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#include "knob.h"
#include <qwt_math.h>
#include <qpen.h>
#include <qwt_knob.h>
#include <qwt_round_scale_draw.h>
#include <qwt_scale_engine.h>
#include <qlabel.h>
#include <qevent.h>
Knob::Knob( const QString &title, double min, double max, QWidget *parent ):
QWidget( parent )
{
QFont font( "Helvetica", 10 );
d_knob = new QwtKnob( this );
d_knob->setFont( font );
QwtScaleDiv scaleDiv =
d_knob->scaleEngine()->divideScale( min, max, 5, 3 );
QList<double> ticks = scaleDiv.ticks( QwtScaleDiv::MajorTick );
if ( ticks.size() > 0 && ticks[0] > min )
{
if ( ticks.first() > min )
ticks.prepend( min );
if ( ticks.last() < max )
ticks.append( max );
}
scaleDiv.setTicks( QwtScaleDiv::MajorTick, ticks );
d_knob->setScale( scaleDiv );
d_knob->setKnobWidth( 50 );
font.setBold( true );
d_label = new QLabel( title, this );
d_label->setFont( font );
d_label->setAlignment( Qt::AlignTop | Qt::AlignHCenter );
setSizePolicy( QSizePolicy::MinimumExpanding,
QSizePolicy::MinimumExpanding );
connect( d_knob, SIGNAL( valueChanged( double ) ),
this, SIGNAL( valueChanged( double ) ) );
}
QSize Knob::sizeHint() const
{
QSize sz1 = d_knob->sizeHint();
QSize sz2 = d_label->sizeHint();
const int w = qMax( sz1.width(), sz2.width() );
const int h = sz1.height() + sz2.height();
int off = qCeil( d_knob->scaleDraw()->extent( d_knob->font() ) );
off -= 15; // spacing
return QSize( w, h - off );
}
void Knob::setValue( double value )
{
d_knob->setValue( value );
}
double Knob::value() const
{
return d_knob->value();
}
void Knob::setTheme( const QColor &color )
{
d_knob->setPalette( color );
}
QColor Knob::theme() const
{
return d_knob->palette().color( QPalette::Window );
}
void Knob::resizeEvent( QResizeEvent *event )
{
const QSize sz = event->size();
const QSize hint = d_label->sizeHint();
d_label->setGeometry( 0, sz.height() - hint.height(),
sz.width(), hint.height() );
const int knobHeight = d_knob->sizeHint().height();
int off = qCeil( d_knob->scaleDraw()->extent( d_knob->font() ) );
off -= 15; // spacing
d_knob->setGeometry( 0, d_label->pos().y() - knobHeight + off,
sz.width(), knobHeight );
}
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