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