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#include "ampfrm.h"
#include <qwt_knob.h>
#include <qwt_thermo.h>
#include <qwt_round_scale_draw.h>
#include <qwt_math.h>
#include <qlayout.h>
#include <qlabel.h>
#include <qfont.h>
#include <qpen.h>
#include <qevent.h>
#if QT_VERSION < 0x040600
#define qFastSin(x) ::sin(x)
#define qFastCos(x) ::cos(x)
#endif
class Knob: public QWidget
{
public:
Knob( const QString &title, double min, double max, QWidget *parent ):
QWidget( parent )
{
d_knob = new QwtKnob( this );
d_knob->setScale( min, max );
d_knob->setTotalSteps( 0 ); // disable
d_knob->setScaleMaxMajor( 10 );
d_knob->setKnobStyle( QwtKnob::Raised );
d_knob->setKnobWidth( 50 );
d_knob->setBorderWidth( 2 );
d_knob->setMarkerStyle( QwtKnob::Notch );
d_knob->setMarkerSize( 8 );
d_knob->scaleDraw()->setTickLength( QwtScaleDiv::MinorTick, 4 );
d_knob->scaleDraw()->setTickLength( QwtScaleDiv::MediumTick, 4 );
d_knob->scaleDraw()->setTickLength( QwtScaleDiv::MajorTick, 6 );
d_label = new QLabel( title, this );
d_label->setAlignment( Qt::AlignTop | Qt::AlignHCenter );
setSizePolicy( QSizePolicy::MinimumExpanding,
QSizePolicy::MinimumExpanding );
}
virtual QSize 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 -= 10; // spacing
return QSize( w, h - off );
}
void setValue( double value )
{
d_knob->setValue( value );
}
double value() const
{
return d_knob->value();
}
protected:
virtual void resizeEvent( QResizeEvent *e )
{
const QSize sz = e->size();
int h = d_label->sizeHint().height();
d_label->setGeometry( 0, sz.height() - h, sz.width(), h );
h = d_knob->sizeHint().height();
int off = qCeil( d_knob->scaleDraw()->extent( d_knob->font() ) );
off -= 10; // spacing
d_knob->setGeometry( 0, d_label->pos().y() - h + off,
sz.width(), h );
}
private:
QwtKnob *d_knob;
QLabel *d_label;
};
class Thermo: public QWidget
{
public:
Thermo( const QString &title, QWidget *parent ):
QWidget( parent )
{
d_thermo = new QwtThermo( this );
d_thermo->setPipeWidth( 6 );
d_thermo->setScale( -40, 10 );
d_thermo->setFillBrush( Qt::green );
d_thermo->setAlarmBrush( Qt::red );
d_thermo->setAlarmLevel( 0.0 );
d_thermo->setAlarmEnabled( true );
QLabel *label = new QLabel( title, this );
label->setAlignment( Qt::AlignTop | Qt::AlignLeft );
QVBoxLayout *layout = new QVBoxLayout( this );
layout->setMargin( 0 );
layout->setSpacing( 0 );
layout->addWidget( d_thermo, 10 );
layout->addWidget( label );
}
void setValue( double value )
{
d_thermo->setValue( value );
}
private:
QwtThermo *d_thermo;
};
AmpFrame::AmpFrame( QWidget *p ):
QFrame( p )
{
d_knbVolume = new Knob( "Volume", 0.0, 10.0, this );
d_knbBalance = new Knob( "Balance", -10.0, 10.0, this );
d_knbTreble = new Knob( "Treble", -10.0, 10.0, this );
d_knbBass = new Knob( "Bass", -10.0, 10.0, this );
d_thmLeft = new Thermo( "Left [dB]", this );
d_thmRight = new Thermo( "Right [dB]", this );
QHBoxLayout *layout = new QHBoxLayout( this );
layout->setSpacing( 0 );
layout->setMargin( 10 );
layout->addWidget( d_knbVolume );
layout->addWidget( d_knbBalance);
layout->addWidget( d_knbTreble);
layout->addWidget( d_knbBass );
layout->addSpacing( 20 );
layout->addStretch( 10 );
layout->addWidget( d_thmLeft );
layout->addSpacing( 10 );
layout->addWidget( d_thmRight );
d_knbVolume->setValue( 7.0 );
( void )startTimer( 50 );
}
void AmpFrame::timerEvent( QTimerEvent * )
{
static double phs = 0;
//
// This amplifier generates its own input signal...
//
const double sig_bass = ( 1.0 + 0.1 * d_knbBass->value() )
* qFastSin( 13.0 * phs );
const double sig_mid_l = qFastSin( 17.0 * phs );
const double sig_mid_r = qFastCos( 17.5 * phs );
const double sig_trbl_l = 0.5 * ( 1.0 + 0.1 * d_knbTreble->value() )
* qFastSin( 35.0 * phs );
const double sig_trbl_r = 0.5 * ( 1.0 + 0.1 * d_knbTreble->value() )
* qFastSin( 34.0 * phs );
double sig_l = 0.05 * d_master * d_knbVolume->value()
* qwtSqr( sig_bass + sig_mid_l + sig_trbl_l );
double sig_r = 0.05 * d_master * d_knbVolume->value()
* qwtSqr( sig_bass + sig_mid_r + sig_trbl_r );
double balance = 0.1 * d_knbBalance->value();
if ( balance > 0 )
sig_l *= ( 1.0 - balance );
else
sig_r *= ( 1.0 + balance );
if ( sig_l > 0.01 )
sig_l = 20.0 * log10( sig_l );
else
sig_l = -40.0;
if ( sig_r > 0.01 )
sig_r = 20.0 * log10( sig_r );
else
sig_r = - 40.0;
d_thmLeft->setValue( sig_l );
d_thmRight->setValue( sig_r );
phs += M_PI / 100;
if ( phs > M_PI )
phs = 0;
}
void AmpFrame::setMaster( double v )
{
d_master = v;
}
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