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examples/radio/AmplifierBox.cpp

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+/******************************************************************************
+ * Qwt Widget Library
+ * Copyright (C) 1997   Josef Wilgen
+ * Copyright (C) 2002   Uwe Rathmann
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the Qwt License, Version 1.0
+ *****************************************************************************/
+
+#include "AmplifierBox.h"
+
+#include <QwtKnob>
+#include <QwtThermo>
+#include <QwtRoundScaleDraw>
+#include <QwtMath>
+
+#include <QLayout>
+#include <QLabel>
+#include <QResizeEvent>
+#include <qmath.h>
+
+class Knob : public QWidget
+{
+  public:
+    Knob( const QString& title, double min, double max, QWidget* parent = NULL )
+        : QWidget( parent )
+    {
+        m_knob = new QwtKnob( this );
+        m_knob->setScale( min, max );
+        m_knob->setTotalSteps( 0 ); // disable
+        m_knob->setScaleMaxMajor( 10 );
+
+        m_knob->setKnobStyle( QwtKnob::Raised );
+        m_knob->setKnobWidth( 50 );
+        m_knob->setBorderWidth( 2 );
+        m_knob->setMarkerStyle( QwtKnob::Notch );
+        m_knob->setMarkerSize( 8 );
+
+        m_knob->scaleDraw()->setTickLength( QwtScaleDiv::MinorTick, 4 );
+        m_knob->scaleDraw()->setTickLength( QwtScaleDiv::MediumTick, 4 );
+        m_knob->scaleDraw()->setTickLength( QwtScaleDiv::MajorTick, 6 );
+
+        m_label = new QLabel( title, this );
+        m_label->setAlignment( Qt::AlignTop | Qt::AlignHCenter );
+
+        setSizePolicy( QSizePolicy::MinimumExpanding,
+            QSizePolicy::MinimumExpanding );
+    }
+
+    virtual QSize sizeHint() const QWT_OVERRIDE
+    {
+        QSize sz1 = m_knob->sizeHint();
+        QSize sz2 = m_label->sizeHint();
+
+        const int w = qMax( sz1.width(), sz2.width() );
+        const int h = sz1.height() + sz2.height();
+
+        int off = qCeil( m_knob->scaleDraw()->extent( m_knob->font() ) );
+        off -= 10; // spacing
+
+        return QSize( w, h - off );
+    }
+
+    void setValue( double value )
+    {
+        m_knob->setValue( value );
+    }
+
+    double value() const
+    {
+        return m_knob->value();
+    }
+
+  protected:
+    virtual void resizeEvent( QResizeEvent* event ) QWT_OVERRIDE
+    {
+        const QSize sz = event->size();
+
+        int h = m_label->sizeHint().height();
+
+        m_label->setGeometry( 0, sz.height() - h, sz.width(), h );
+
+        h = m_knob->sizeHint().height();
+        int off = qCeil( m_knob->scaleDraw()->extent( m_knob->font() ) );
+        off -= 10; // spacing
+
+        m_knob->setGeometry( 0, m_label->pos().y() - h + off,
+            sz.width(), h );
+    }
+
+  private:
+    QwtKnob* m_knob;
+    QLabel* m_label;
+};
+
+class Thermo : public QWidget
+{
+  public:
+    Thermo( const QString& title, QWidget* parent = NULL )
+        : QWidget( parent )
+    {
+        m_thermo = new QwtThermo( this );
+        m_thermo->setPipeWidth( 6 );
+        m_thermo->setScale( -40, 10 );
+        m_thermo->setFillBrush( Qt::green );
+        m_thermo->setAlarmBrush( Qt::red );
+        m_thermo->setAlarmLevel( 0.0 );
+        m_thermo->setAlarmEnabled( true );
+
+        QLabel* label = new QLabel( title, this );
+        label->setAlignment( Qt::AlignTop | Qt::AlignLeft );
+
+        QVBoxLayout* layout = new QVBoxLayout( this );
+        layout->setContentsMargins( QMargins() );
+        layout->setSpacing( 0 );
+        layout->addWidget( m_thermo, 10 );
+        layout->addWidget( label );
+    }
+
+    void setValue( double value )
+    {
+        m_thermo->setValue( value );
+    }
+
+  private:
+    QwtThermo* m_thermo;
+};
+
+AmplifierBox::AmplifierBox( QWidget* p )
+    : QFrame( p )
+{
+    m_knobVolume = new Knob( "Volume", 0, 10 );
+    m_knobBalance = new Knob( "Balance", -10, 10 );
+    m_knobTreble = new Knob( "Treble", -10, 10 );
+    m_knobBass = new Knob( "Bass", -10, 10 );
+
+    m_gaugeLeft = new Thermo( "Left [dB]" );
+    m_gaugeRight = new Thermo( "Right [dB]" );
+
+    QHBoxLayout* layout = new QHBoxLayout( this );
+    layout->setSpacing( 0 );
+    layout->setContentsMargins( 10, 10, 10, 10 );
+    layout->addWidget( m_knobVolume );
+    layout->addWidget( m_knobBalance);
+    layout->addWidget( m_knobTreble);
+    layout->addWidget( m_knobBass );
+    layout->addSpacing( 20 );
+    layout->addStretch( 10 );
+    layout->addWidget( m_gaugeLeft );
+    layout->addSpacing( 10 );
+    layout->addWidget( m_gaugeRight );
+
+    m_knobVolume->setValue( 7.0 );
+    ( void )startTimer( 50 );
+}
+
+void AmplifierBox::timerEvent( QTimerEvent* )
+{
+    static double phase = 0;
+
+    // This amplifier generates its own input signal...
+
+    const double sig_bass = ( 1.0 + 0.1 * m_knobBass->value() )
+        * std::sin( 13.0 * phase );
+    const double sig_mim_l = std::sin( 17.0 * phase );
+    const double sig_mim_r = std::cos( 17.5 * phase );
+    const double sig_trbl_l = 0.5 * ( 1.0 + 0.1 * m_knobTreble->value() )
+        * std::sin( 35.0 * phase );
+    const double sig_trbl_r = 0.5 * ( 1.0 + 0.1 * m_knobTreble->value() )
+        * std::sin( 34.0 * phase );
+
+    double sig_l = 0.05 * m_master * m_knobVolume->value()
+        * qwtSqr( sig_bass + sig_mim_l + sig_trbl_l );
+    double sig_r = 0.05 * m_master * m_knobVolume->value()
+        * qwtSqr( sig_bass + sig_mim_r + sig_trbl_r );
+
+    double balance = 0.1 * m_knobBalance->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;
+
+    m_gaugeLeft->setValue( sig_l );
+    m_gaugeRight->setValue( sig_r );
+
+    phase += M_PI / 100;
+    if ( phase > M_PI )
+        phase = 0;
+}
+
+void AmplifierBox::setMaster( double v )
+{
+    m_master = v;
+}
+
+#include "moc_AmplifierBox.cpp"