qwt_plot_zoneitem.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_plot_zoneitem.h"
#include "qwt_painter.h"
#include "qwt_scale_map.h"
#include "qwt_text.h"
#include "qwt_interval.h"
 
#include <qpainter.h>
 
class QwtPlotZoneItem::PrivateData
{
  public:
    PrivateData()
        : orientation( Qt::Vertical )
        , pen( Qt::NoPen )
    {
        QColor c( Qt::darkGray );
        c.setAlpha( 100 );
        brush = QBrush( c );
    }
 
    Qt::Orientation orientation;
    QPen pen;
    QBrush brush;
    QwtInterval interval;
};
 
QwtPlotZoneItem::QwtPlotZoneItem()
    : QwtPlotItem( QwtText( "Zone" ) )
{
    m_data = new PrivateData;
 
    setItemAttribute( QwtPlotItem::AutoScale, false );
    setItemAttribute( QwtPlotItem::Legend, false );
 
    setZ( 5 );
}
 
QwtPlotZoneItem::~QwtPlotZoneItem()
{
    delete m_data;
}
 
int QwtPlotZoneItem::rtti() const
{
    return QwtPlotItem::Rtti_PlotZone;
}
 
void QwtPlotZoneItem::setPen( const QColor& color, qreal width, Qt::PenStyle style )
{
    setPen( QPen( color, width, style ) );
}
 
void QwtPlotZoneItem::setPen( const QPen& pen )
{
    if ( m_data->pen != pen )
    {
        m_data->pen = pen;
        itemChanged();
    }
}
 
const QPen& QwtPlotZoneItem::pen() const
{
    return m_data->pen;
}
 
void QwtPlotZoneItem::setBrush( const QBrush& brush )
{
    if ( m_data->brush != brush )
    {
        m_data->brush = brush;
        itemChanged();
    }
}
 
const QBrush& QwtPlotZoneItem::brush() const
{
    return m_data->brush;
}
 
void QwtPlotZoneItem::setOrientation( Qt::Orientation orientation )
{
    if ( m_data->orientation != orientation )
    {
        m_data->orientation = orientation;
        itemChanged();
    }
}
 
Qt::Orientation QwtPlotZoneItem::orientation() const
{
    return m_data->orientation;
}
 
void QwtPlotZoneItem::setInterval( double min, double max )
{
    setInterval( QwtInterval( min, max ) );
}
 
void QwtPlotZoneItem::setInterval( const QwtInterval& interval )
{
    if ( m_data->interval != interval )
    {
        m_data->interval = interval;
        itemChanged();
    }
}
 
QwtInterval QwtPlotZoneItem::interval() const
{
    return m_data->interval;
}
 
void QwtPlotZoneItem::draw( QPainter* painter,
    const QwtScaleMap& xMap, const QwtScaleMap& yMap,
    const QRectF& canvasRect ) const
{
    if ( !m_data->interval.isValid() )
        return;
 
    QPen pen = m_data->pen;
    pen.setCapStyle( Qt::FlatCap );
 
    const bool doAlign = QwtPainter::roundingAlignment( painter );
 
    if ( m_data->orientation == Qt::Horizontal )
    {
        double y1 = yMap.transform( m_data->interval.minValue() );
        double y2 = yMap.transform( m_data->interval.maxValue() );
 
        if ( doAlign )
        {
            y1 = qRound( y1 );
            y2 = qRound( y2 );
        }
 
        QRectF r( canvasRect.left(), y1, canvasRect.width(), y2 - y1 );
        r = r.normalized();
 
        if ( ( m_data->brush.style() != Qt::NoBrush ) && ( y1 != y2 ) )
        {
            QwtPainter::fillRect( painter, r, m_data->brush );
        }
 
        if ( m_data->pen.style() != Qt::NoPen )
        {
            painter->setPen( m_data->pen );
 
            QwtPainter::drawLine( painter, r.left(), r.top(), r.right(), r.top() );
            QwtPainter::drawLine( painter, r.left(), r.bottom(), r.right(), r.bottom() );
        }
    }
    else
    {
        double x1 = xMap.transform( m_data->interval.minValue() );
        double x2 = xMap.transform( m_data->interval.maxValue() );
 
        if ( doAlign )
        {
            x1 = qRound( x1 );
            x2 = qRound( x2 );
        }
 
        QRectF r( x1, canvasRect.top(), x2 - x1, canvasRect.height() );
        r = r.normalized();
 
        if ( ( m_data->brush.style() != Qt::NoBrush ) && ( x1 != x2 ) )
        {
            QwtPainter::fillRect( painter, r, m_data->brush );
        }
 
        if ( m_data->pen.style() != Qt::NoPen )
        {
            painter->setPen( m_data->pen );
 
            QwtPainter::drawLine( painter, r.left(), r.top(), r.left(), r.bottom() );
            QwtPainter::drawLine( painter, r.right(), r.top(), r.right(), r.bottom() );
        }
    }
}
 
QRectF QwtPlotZoneItem::boundingRect() const
{
    QRectF br = QwtPlotItem::boundingRect();
 
    const QwtInterval& intv = m_data->interval;
 
    if ( intv.isValid() )
    {
        if ( m_data->orientation == Qt::Horizontal )
        {
            br.setTop( intv.minValue() );
            br.setBottom( intv.maxValue() );
        }
        else
        {
            br.setLeft( intv.minValue() );
            br.setRight( intv.maxValue() );
        }
    }
 
    return br;
}