qwt_thermo.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 "qwt_thermo.h"
#include "qwt_scale_draw.h"
#include "qwt_scale_map.h"
#include "qwt_color_map.h"
#include "qwt_math.h"
 
#include <qpainter.h>
#include <qevent.h>
#include <qdrawutil.h>
#include <qstyle.h>
#include <qstyleoption.h>
#include <qmargins.h>
 
#include <algorithm>
#include <functional>
 
static inline void qwtDrawLine( QPainter* painter, int pos,
    const QColor& color, const QRect& pipeRect, const QRect& liquidRect,
    Qt::Orientation orientation )
{
    painter->setPen( color );
    if ( orientation == Qt::Horizontal )
    {
        if ( pos >= liquidRect.left() && pos < liquidRect.right() )
            painter->drawLine( pos, pipeRect.top(), pos, pipeRect.bottom() );
    }
    else
    {
        if ( pos >= liquidRect.top() && pos < liquidRect.bottom() )
            painter->drawLine( pipeRect.left(), pos, pipeRect.right(), pos );
    }
}
 
static QVector< double > qwtTickList( const QwtScaleDiv& scaleDiv )
{
    QVector< double > values;
 
    double lowerLimit = scaleDiv.interval().minValue();
    double upperLimit = scaleDiv.interval().maxValue();
 
    if ( upperLimit < lowerLimit )
        qSwap( lowerLimit, upperLimit );
 
    values += lowerLimit;
 
    for ( int tickType = QwtScaleDiv::MinorTick;
        tickType < QwtScaleDiv::NTickTypes; tickType++ )
    {
        const QList< double > ticks = scaleDiv.ticks( tickType );
 
        for ( int i = 0; i < ticks.count(); i++ )
        {
            const double v = ticks[i];
            if ( v > lowerLimit && v < upperLimit )
                values += v;
        }
    }
 
    values += upperLimit;
 
    return values;
}
 
class QwtThermo::PrivateData
{
  public:
    PrivateData()
        : orientation( Qt::Vertical )
        , scalePosition( QwtThermo::TrailingScale )
        , spacing( 3 )
        , borderWidth( 2 )
        , pipeWidth( 10 )
        , alarmLevel( 0.0 )
        , alarmEnabled( false )
        , autoFillPipe( true )
        , originMode( QwtThermo::OriginMinimum )
        , origin( 0.0 )
        , colorMap( NULL )
        , value( 0.0 )
    {
        rangeFlags = QwtInterval::IncludeBorders;
    }
 
    ~PrivateData()
    {
        delete colorMap;
    }
 
    Qt::Orientation orientation;
    QwtThermo::ScalePosition scalePosition;
 
    int spacing;
    int borderWidth;
    int pipeWidth;
 
    QwtInterval::BorderFlags rangeFlags;
    double alarmLevel;
    bool alarmEnabled;
    bool autoFillPipe;
    QwtThermo::OriginMode originMode;
    double origin;
 
    QwtColorMap* colorMap;
 
    double value;
};
 
QwtThermo::QwtThermo( QWidget* parent )
    : QwtAbstractScale( parent )
{
    m_data = new PrivateData;
 
    QSizePolicy policy( QSizePolicy::MinimumExpanding, QSizePolicy::Fixed );
    if ( m_data->orientation == Qt::Vertical )
        policy.transpose();
 
    setSizePolicy( policy );
 
    setAttribute( Qt::WA_WState_OwnSizePolicy, false );
    layoutThermo( true );
}
 
QwtThermo::~QwtThermo()
{
    delete m_data;
}
 
void QwtThermo::setRangeFlags( QwtInterval::BorderFlags flags )
{
    if ( m_data->rangeFlags != flags )
    {
        m_data->rangeFlags = flags;
        update();
    }
}
 
QwtInterval::BorderFlags QwtThermo::rangeFlags() const
{
    return m_data->rangeFlags;
}
 
void QwtThermo::setValue( double value )
{
    if ( m_data->value != value )
    {
        m_data->value = value;
        update();
    }
}
 
double QwtThermo::value() const
{
    return m_data->value;
}
 
void QwtThermo::setScaleDraw( QwtScaleDraw* scaleDraw )
{
    setAbstractScaleDraw( scaleDraw );
    layoutThermo( true );
}
 
const QwtScaleDraw* QwtThermo::scaleDraw() const
{
    return static_cast< const QwtScaleDraw* >( abstractScaleDraw() );
}
 
QwtScaleDraw* QwtThermo::scaleDraw()
{
    return static_cast< QwtScaleDraw* >( abstractScaleDraw() );
}
 
void QwtThermo::paintEvent( QPaintEvent* event )
{
    QPainter painter( this );
    painter.setClipRegion( event->region() );
 
    QStyleOption opt;
    opt.initFrom(this);
    style()->drawPrimitive(QStyle::PE_Widget, &opt, &painter, this);
 
    const QRect tRect = pipeRect();
 
    if ( !tRect.contains( event->rect() ) )
    {
        if ( m_data->scalePosition != QwtThermo::NoScale )
            scaleDraw()->draw( &painter, palette() );
    }
 
    const int bw = m_data->borderWidth;
 
    const QBrush brush = palette().brush( QPalette::Base );
    qDrawShadePanel( &painter,
        tRect.adjusted( -bw, -bw, bw, bw ),
        palette(), true, bw,
        m_data->autoFillPipe ? &brush : NULL );
 
    drawLiquid( &painter, tRect );
}
 
void QwtThermo::resizeEvent( QResizeEvent* event )
{
    Q_UNUSED( event );
    layoutThermo( false );
}
 
void QwtThermo::changeEvent( QEvent* event )
{
    switch( event->type() )
    {
        case QEvent::StyleChange:
        case QEvent::FontChange:
        {
            layoutThermo( true );
            break;
        }
        default:
            break;
    }
}
 
void QwtThermo::layoutThermo( bool update_geometry )
{
    const QRect tRect = pipeRect();
    const int bw = m_data->borderWidth + m_data->spacing;
    const bool inverted = ( upperBound() < lowerBound() );
 
    int from, to;
 
    if ( m_data->orientation == Qt::Horizontal )
    {
        from = tRect.left();
        to = tRect.right();
 
        if ( m_data->rangeFlags & QwtInterval::ExcludeMinimum )
        {
            if ( inverted )
                to++;
            else
                from--;
        }
        if ( m_data->rangeFlags & QwtInterval::ExcludeMaximum )
        {
            if ( inverted )
                from--;
            else
                to++;
        }
 
        if ( m_data->scalePosition == QwtThermo::TrailingScale )
        {
            scaleDraw()->setAlignment( QwtScaleDraw::TopScale );
            scaleDraw()->move( from, tRect.top() - bw );
        }
        else
        {
            scaleDraw()->setAlignment( QwtScaleDraw::BottomScale );
            scaleDraw()->move( from, tRect.bottom() + bw );
        }
 
        scaleDraw()->setLength( qMax( to - from, 0 ) );
    }
    else // Qt::Vertical
    {
        from = tRect.top();
        to = tRect.bottom();
 
        if ( m_data->rangeFlags & QwtInterval::ExcludeMinimum )
        {
            if ( inverted )
                from--;
            else
                to++;
        }
        if ( m_data->rangeFlags & QwtInterval::ExcludeMaximum )
        {
            if ( inverted )
                to++;
            else
                from--;
        }
 
        if ( m_data->scalePosition == QwtThermo::LeadingScale )
        {
            scaleDraw()->setAlignment( QwtScaleDraw::RightScale );
            scaleDraw()->move( tRect.right() + bw, from );
        }
        else
        {
            scaleDraw()->setAlignment( QwtScaleDraw::LeftScale );
            scaleDraw()->move( tRect.left() - bw, from );
        }
 
        scaleDraw()->setLength( qMax( to - from, 0 ) );
    }
 
    if ( update_geometry )
    {
        updateGeometry();
        update();
    }
}
 
QRect QwtThermo::pipeRect() const
{
    int mbd = 0;
    if ( m_data->scalePosition != QwtThermo::NoScale )
    {
        int d1, d2;
        scaleDraw()->getBorderDistHint( font(), d1, d2 );
        mbd = qMax( d1, d2 );
    }
    const int bw = m_data->borderWidth;
    const int scaleOff = bw + mbd;
 
    const QRect cr = contentsRect();
 
    QRect pipeRect = cr;
    if ( m_data->orientation == Qt::Horizontal )
    {
        pipeRect.adjust( scaleOff, 0, -scaleOff, 0 );
 
        if ( m_data->scalePosition == QwtThermo::TrailingScale )
            pipeRect.setTop( cr.top() + cr.height() - bw - m_data->pipeWidth );
        else
            pipeRect.setTop( bw );
 
        pipeRect.setHeight( m_data->pipeWidth );
    }
    else // Qt::Vertical
    {
        pipeRect.adjust( 0, scaleOff, 0, -scaleOff );
 
        if ( m_data->scalePosition == QwtThermo::LeadingScale )
            pipeRect.setLeft( bw );
        else
            pipeRect.setLeft( cr.left() + cr.width() - bw - m_data->pipeWidth );
 
        pipeRect.setWidth( m_data->pipeWidth );
    }
 
    return pipeRect;
}
 
void QwtThermo::setOrientation( Qt::Orientation orientation )
{
    if ( orientation == m_data->orientation )
        return;
 
    m_data->orientation = orientation;
 
    if ( !testAttribute( Qt::WA_WState_OwnSizePolicy ) )
    {
        QSizePolicy sp = sizePolicy();
        sp.transpose();
        setSizePolicy( sp );
 
        setAttribute( Qt::WA_WState_OwnSizePolicy, false );
    }
 
    layoutThermo( true );
}
 
Qt::Orientation QwtThermo::orientation() const
{
    return m_data->orientation;
}
 
void QwtThermo::setOriginMode( OriginMode m )
{
    if ( m == m_data->originMode )
        return;
 
    m_data->originMode = m;
    update();
}
 
QwtThermo::OriginMode QwtThermo::originMode() const
{
    return m_data->originMode;
}
 
void QwtThermo::setOrigin( double origin )
{
    if ( origin == m_data->origin )
        return;
 
    m_data->origin = origin;
    update();
}
 
double QwtThermo::origin() const
{
    return m_data->origin;
}
 
void QwtThermo::setScalePosition( ScalePosition scalePosition )
{
    if ( m_data->scalePosition == scalePosition )
        return;
 
    m_data->scalePosition = scalePosition;
 
    if ( testAttribute( Qt::WA_WState_Polished ) )
        layoutThermo( true );
}
 
QwtThermo::ScalePosition QwtThermo::scalePosition() const
{
    return m_data->scalePosition;
}
 
void QwtThermo::scaleChange()
{
    layoutThermo( true );
}
 
void QwtThermo::drawLiquid(
    QPainter* painter, const QRect& pipeRect ) const
{
    painter->save();
    painter->setClipRect( pipeRect, Qt::IntersectClip );
    painter->setPen( Qt::NoPen );
 
    const QwtScaleMap scaleMap = scaleDraw()->scaleMap();
 
    QRect liquidRect = fillRect( pipeRect );
 
    if ( m_data->colorMap != NULL )
    {
        const QwtInterval interval = scaleDiv().interval().normalized();
 
        // Because the positions of the ticks are rounded
        // we calculate the colors for the rounded tick values
 
        QVector< double > values = qwtTickList( scaleDraw()->scaleDiv() );
 
        if ( scaleMap.isInverting() )
            std::sort( values.begin(), values.end(), std::greater< double >() );
        else
            std::sort( values.begin(), values.end(), std::less< double >() );
 
        int from;
        if ( !values.isEmpty() )
        {
            from = qRound( scaleMap.transform( values[0] ) );
            qwtDrawLine( painter, from,
                m_data->colorMap->color( interval, values[0] ),
                pipeRect, liquidRect, m_data->orientation );
        }
 
        for ( int i = 1; i < values.size(); i++ )
        {
            const int to = qRound( scaleMap.transform( values[i] ) );
 
            for ( int pos = from + 1; pos < to; pos++ )
            {
                const double v = scaleMap.invTransform( pos );
 
                qwtDrawLine( painter, pos,
                    m_data->colorMap->color( interval, v ),
                    pipeRect, liquidRect, m_data->orientation );
            }
 
            qwtDrawLine( painter, to,
                m_data->colorMap->color( interval, values[i] ),
                pipeRect, liquidRect, m_data->orientation );
 
            from = to;
        }
    }
    else
    {
        if ( !liquidRect.isEmpty() && m_data->alarmEnabled )
        {
            const QRect r = alarmRect( liquidRect );
            if ( !r.isEmpty() )
            {
                painter->fillRect( r, palette().brush( QPalette::Highlight ) );
                liquidRect = QRegion( liquidRect ).subtracted( r ).boundingRect();
            }
        }
 
        painter->fillRect( liquidRect, palette().brush( QPalette::ButtonText ) );
    }
 
    painter->restore();
}
 
void QwtThermo::setSpacing( int spacing )
{
    if ( spacing <= 0 )
        spacing = 0;
 
    if ( spacing != m_data->spacing  )
    {
        m_data->spacing = spacing;
        layoutThermo( true );
    }
}
 
int QwtThermo::spacing() const
{
    return m_data->spacing;
}
 
void QwtThermo::setBorderWidth( int width )
{
    if ( width <= 0 )
        width = 0;
 
    if ( width != m_data->borderWidth  )
    {
        m_data->borderWidth = width;
        layoutThermo( true );
    }
}
 
int QwtThermo::borderWidth() const
{
    return m_data->borderWidth;
}
 
void QwtThermo::setColorMap( QwtColorMap* colorMap )
{
    if ( colorMap != m_data->colorMap )
    {
        delete m_data->colorMap;
        m_data->colorMap = colorMap;
    }
}
 
QwtColorMap* QwtThermo::colorMap()
{
    return m_data->colorMap;
}
 
const QwtColorMap* QwtThermo::colorMap() const
{
    return m_data->colorMap;
}
 
void QwtThermo::setFillBrush( const QBrush& brush )
{
    QPalette pal = palette();
    pal.setBrush( QPalette::ButtonText, brush );
    setPalette( pal );
}
 
QBrush QwtThermo::fillBrush() const
{
    return palette().brush( QPalette::ButtonText );
}
 
void QwtThermo::setAlarmBrush( const QBrush& brush )
{
    QPalette pal = palette();
    pal.setBrush( QPalette::Highlight, brush );
    setPalette( pal );
}
 
QBrush QwtThermo::alarmBrush() const
{
    return palette().brush( QPalette::Highlight );
}
 
void QwtThermo::setAlarmLevel( double level )
{
    m_data->alarmLevel = level;
    m_data->alarmEnabled = 1;
    update();
}
 
double QwtThermo::alarmLevel() const
{
    return m_data->alarmLevel;
}
 
void QwtThermo::setPipeWidth( int width )
{
    if ( width > 0 )
    {
        m_data->pipeWidth = width;
        layoutThermo( true );
    }
}
 
int QwtThermo::pipeWidth() const
{
    return m_data->pipeWidth;
}
 
void QwtThermo::setAlarmEnabled( bool on )
{
    m_data->alarmEnabled = on;
    update();
}
 
bool QwtThermo::alarmEnabled() const
{
    return m_data->alarmEnabled;
}
 
QSize QwtThermo::sizeHint() const
{
    return minimumSizeHint();
}
 
QSize QwtThermo::minimumSizeHint() const
{
    int w = 0, h = 0;
 
    if ( m_data->scalePosition != NoScale )
    {
        const int sdExtent = qwtCeil( scaleDraw()->extent( font() ) );
        const int sdLength = scaleDraw()->minLength( font() );
 
        w = sdLength;
        h = m_data->pipeWidth + sdExtent + m_data->spacing;
 
    }
    else // no scale
    {
        w = 200;
        h = m_data->pipeWidth;
    }
 
    if ( m_data->orientation == Qt::Vertical )
        qSwap( w, h );
 
    w += 2 * m_data->borderWidth;
    h += 2 * m_data->borderWidth;
 
    // finally add the margins
    const QMargins m = contentsMargins();
    w += m.left() + m.right();
    h += m.top() + m.bottom();
 
    return QSize( w, h );
}
 
QRect QwtThermo::fillRect( const QRect& pipeRect ) const
{
    double origin;
    if ( m_data->originMode == OriginMinimum )
    {
        origin = qMin( lowerBound(), upperBound() );
    }
    else if ( m_data->originMode == OriginMaximum )
    {
        origin = qMax( lowerBound(), upperBound() );
    }
    else // OriginCustom
    {
        origin = m_data->origin;
    }
 
    const QwtScaleMap scaleMap = scaleDraw()->scaleMap();
 
    int from = qRound( scaleMap.transform( m_data->value ) );
    int to = qRound( scaleMap.transform( origin ) );
 
    if ( to < from )
        qSwap( from, to );
 
    QRect fillRect = pipeRect;
    if ( m_data->orientation == Qt::Horizontal )
    {
        fillRect.setLeft( from );
        fillRect.setRight( to );
    }
    else // Qt::Vertical
    {
        fillRect.setTop( from );
        fillRect.setBottom( to );
    }
 
    return fillRect.normalized();
}
 
QRect QwtThermo::alarmRect( const QRect& fillRect ) const
{
    QRect alarmRect( 0, 0, -1, -1); // something invalid
 
    if ( !m_data->alarmEnabled )
        return alarmRect;
 
    const bool inverted = ( upperBound() < lowerBound() );
 
    bool increasing;
    if ( m_data->originMode == OriginCustom )
    {
        increasing = m_data->value > m_data->origin;
    }
    else
    {
        increasing = m_data->originMode == OriginMinimum;
    }
 
    const QwtScaleMap map = scaleDraw()->scaleMap();
    const int alarmPos = qRound( map.transform( m_data->alarmLevel ) );
    const int valuePos = qRound( map.transform( m_data->value ) );
 
    if ( m_data->orientation == Qt::Horizontal )
    {
        int v1, v2;
        if ( inverted )
        {
            v1 = fillRect.left();
 
            v2 = alarmPos - 1;
            v2 = qMin( v2, increasing ? fillRect.right() : valuePos );
        }
        else
        {
            v1 = alarmPos + 1;
            v1 = qMax( v1, increasing ? fillRect.left() : valuePos );
 
            v2 = fillRect.right();
 
        }
        alarmRect.setRect( v1, fillRect.top(), v2 - v1 + 1, fillRect.height() );
    }
    else
    {
        int v1, v2;
        if ( inverted )
        {
            v1 = alarmPos + 1;
            v1 = qMax( v1, increasing ? fillRect.top() : valuePos );
 
            v2 = fillRect.bottom();
        }
        else
        {
            v1 = fillRect.top();
 
            v2 = alarmPos - 1;
            v2 = qMin( v2, increasing ? fillRect.bottom() : valuePos );
        }
        alarmRect.setRect( fillRect.left(), v1, fillRect.width(), v2 - v1 + 1 );
    }
 
    return alarmRect;
}
 
#if QWT_MOC_INCLUDE
#include "moc_qwt_thermo.cpp"
#endif