qwt_plot_zoneitem.cpp

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/* -*- mode: C++ ; c-file-style: "stroustrup" -*- *****************************
 * 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 <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" ) )
{
    d_data = new PrivateData;

    setItemAttribute( QwtPlotItem::AutoScale, false );
    setItemAttribute( QwtPlotItem::Legend, false );

    setZ( 5 );
}

QwtPlotZoneItem::~QwtPlotZoneItem()
{
    delete d_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 ( d_data->pen != pen )
    {
        d_data->pen = pen;
        itemChanged();
    }
}

const QPen &QwtPlotZoneItem::pen() const
{
    return d_data->pen;
}

void QwtPlotZoneItem::setBrush( const QBrush &brush )
{
    if ( d_data->brush != brush )
    {
        d_data->brush = brush;
        itemChanged();
    }
}

const QBrush &QwtPlotZoneItem::brush() const
{
    return d_data->brush;
}

void QwtPlotZoneItem::setOrientation( Qt::Orientation orientation )
{
    if ( d_data->orientation != orientation )
    {
        d_data->orientation = orientation;
        itemChanged();
    }
}

Qt::Orientation QwtPlotZoneItem::orientation() const
{
    return d_data->orientation;
}

void QwtPlotZoneItem::setInterval( double min, double max )
{
    setInterval( QwtInterval( min, max ) );
}

void QwtPlotZoneItem::setInterval( const QwtInterval &interval )
{
    if ( d_data->interval != interval )
    {
        d_data->interval = interval;
        itemChanged(); 
    }   
}   

QwtInterval QwtPlotZoneItem::interval() const
{
    return d_data->interval;
}   

void QwtPlotZoneItem::draw( QPainter *painter,
    const QwtScaleMap &xMap, const QwtScaleMap &yMap,
    const QRectF &canvasRect ) const
{
    if ( !d_data->interval.isValid() )
        return;

    QPen pen = d_data->pen;
    pen.setCapStyle( Qt::FlatCap );

    const bool doAlign = QwtPainter::roundingAlignment( painter );

    if ( d_data->orientation == Qt::Horizontal )
    {
        double y1 = yMap.transform( d_data->interval.minValue() );
        double y2 = yMap.transform( d_data->interval.maxValue() );

        if ( doAlign )
        {
            y1 = qRound( y1 );
            y2 = qRound( y2 );
        }

        QRectF r( canvasRect.left(), y1, canvasRect.width(), y2 - y1 );
        r = r.normalized();

        if ( ( d_data->brush.style() != Qt::NoBrush ) && ( y1 != y2 ) )
        {
            QwtPainter::fillRect( painter, r, d_data->brush );
        }

        if ( d_data->pen.style() != Qt::NoPen )
        {
            painter->setPen( d_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( d_data->interval.minValue() );
        double x2 = xMap.transform( d_data->interval.maxValue() );

        if ( doAlign )
        {
            x1 = qRound( x1 );
            x2 = qRound( x2 );
        }

        QRectF r( x1, canvasRect.top(), x2 - x1, canvasRect.height() );
        r = r.normalized();

        if ( ( d_data->brush.style() != Qt::NoBrush ) && ( x1 != x2 ) )
        {
            QwtPainter::fillRect( painter, r, d_data->brush );
        }

        if ( d_data->pen.style() != Qt::NoPen )
        {
            painter->setPen( d_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 = d_data->interval;

    if ( intv.isValid() )
    {
        if ( d_data->orientation == Qt::Horizontal )
        {
            br.setTop( intv.minValue() );
            br.setBottom( intv.maxValue() );
        }
        else
        {
            br.setLeft( intv.minValue() );
            br.setRight( intv.maxValue() );
        }
    }

    return br;
}