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# chart/element.cpp Example File

    #include "element.h"

    #include <qstringlist.h>
    #include <qtextstream.h>

    const char FIELD_SEP = ':';
    const char PROPOINT_SEP = ';';
    const char XY_SEP = ',';

    void Element::init( double value, QColor valueColor, int valuePattern,
                        const QString& label, QColor labelColor )
    {
        m_value = value;
        m_valueColor = valueColor;
        if ( valuePattern < Qt::SolidPattern || valuePattern > Qt::DiagCrossPattern )
            valuePattern = Qt::SolidPattern;
        m_valuePattern = valuePattern;
        m_label = label;
        m_labelColor = labelColor;
    }

    void Element::setValuePattern( int valuePattern )
    {
        if ( valuePattern < Qt::SolidPattern || valuePattern > Qt::DiagCrossPattern )
            valuePattern = Qt::SolidPattern;
        m_valuePattern = valuePattern;
    }

    double Element::proX( int index ) const
    {
        Q_ASSERT(index >= 0 && index < MAX_PROPOINTS);
        return m_propoints[2 * index];
    }

    double Element::proY( int index ) const
    {
        Q_ASSERT(index >= 0 && index < MAX_PROPOINTS);
        return m_propoints[(2 * index) + 1];
    }

    void Element::setProX( int index, double value )
    {
        Q_ASSERT(index >= 0 && index < MAX_PROPOINTS);
        m_propoints[2 * index] = value;
    }

    void Element::setProY( int index, double value )
    {
        Q_ASSERT(index >= 0 && index < MAX_PROPOINTS);
        m_propoints[(2 * index) + 1] = value;
    }

    QTextStream &operator<<( QTextStream &s, const Element &element )
    {
        s << element.value() << FIELD_SEP
          << element.valueColor().name() << FIELD_SEP
          << element.valuePattern() << FIELD_SEP
          << element.labelColor().name() << FIELD_SEP;

        for ( int i = 0; i < Element::MAX_PROPOINTS; ++i ) {
            s << element.proX( i ) << XY_SEP << element.proY( i );
            s << ( i == Element::MAX_PROPOINTS - 1 ? FIELD_SEP : PROPOINT_SEP );
        }

        s << element.label() << '\n';

        return s;
    }

    QTextStream &operator>>( QTextStream &s, Element &element )
    {
        QString data = s.readLine();
        element.setValue( Element::INVALID );

        int errors = 0;
        bool ok;

        QStringList fields = QStringList::split( FIELD_SEP, data );
        if ( fields.count() >= 4 ) {
            double value = fields[0].toDouble( &ok );
            if ( !ok )
                errors++;
            QColor valueColor = QColor( fields[1] );
            if ( !valueColor.isValid() )
                errors++;
            int valuePattern = fields[2].toInt( &ok );
            if ( !ok )
                errors++;
            QColor labelColor = QColor( fields[3] );
            if ( !labelColor.isValid() )
                errors++;
            QStringList propoints = QStringList::split( PROPOINT_SEP, fields[4] );
            QString label = data.section( FIELD_SEP, 5 );

            if ( !errors ) {
                element.set( value, valueColor, valuePattern, label, labelColor );
                int i = 0;
                for ( QStringList::iterator point = propoints.begin();
                    i < Element::MAX_PROPOINTS && point != propoints.end();
                    ++i, ++point ) {
                    errors = 0;
                    QStringList xy = QStringList::split( XY_SEP, *point );
                    double x = xy[0].toDouble( &ok );
                    if ( !ok || x <= 0.0 || x >= 1.0 )
                        errors++;
                    double y = xy[1].toDouble( &ok );
                    if ( !ok || y <= 0.0 || y >= 1.0 )
                        errors++;
                    if ( errors )
                        x = y = Element::NO_PROPORTION;
                    element.setProX( i, x );
                    element.setProY( i, y );
                }
            }
        }

        return s;
    }