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# chart/element.h Example File

    #ifndef ELEMENT_H
    #define ELEMENT_H

    #include <qcolor.h>
    #include <qnamespace.h>
    #include <qstring.h>
    #include <qvaluevector.h>

    class Element;

    typedef QValueVector<Element> ElementVector;

    /*
        Elements are valid if they have a value which is > EPSILON.
    */
    const double EPSILON = 0.0000001; // Must be > INVALID.

    class Element
    {
    public:
        enum { INVALID = -1 };
        enum { NO_PROPORTION = -1 };
        enum { MAX_PROPOINTS = 3 }; // One proportional point per chart type

        Element( double value = INVALID, QColor valueColor = Qt::gray,
                 int valuePattern = Qt::SolidPattern,
                 const QString& label = QString::null,
                 QColor labelColor = Qt::black ) {
            init( value, valueColor, valuePattern, label, labelColor );
            for ( int i = 0; i < MAX_PROPOINTS * 2; ++i )
                m_propoints[i] = NO_PROPORTION;
        }
        ~Element() {}

        bool isValid() const { return m_value > EPSILON; }

        double value() const { return m_value; }
        QColor valueColor() const { return m_valueColor; }
        int valuePattern() const { return m_valuePattern; }
        QString label() const { return m_label; }
        QColor labelColor() const { return m_labelColor; }
        double proX( int index ) const;
        double proY( int index ) const;

        void set( double value = INVALID, QColor valueColor = Qt::gray,
                  int valuePattern = Qt::SolidPattern,
                  const QString& label = QString::null,
                  QColor labelColor = Qt::black ) {
            init( value, valueColor, valuePattern, label, labelColor );
        }
        void setValue( double value ) { m_value = value; }
        void setValueColor( QColor valueColor ) { m_valueColor = valueColor; }
        void setValuePattern( int valuePattern );
        void setLabel( const QString& label ) { m_label = label; }
        void setLabelColor( QColor labelColor ) { m_labelColor = labelColor; }
        void setProX( int index, double value );
        void setProY( int index, double value );

    #ifdef Q_FULL_TEMPLATE_INSTANTIATION
        // xlC 3.x workaround
        Q_DUMMY_COMPARISON_OPERATOR(Element)
        bool operator!=( const Element& e) const {
            return ( !(e == *this) );
        }
    #endif

    private:
        void init( double value, QColor valueColor, int valuePattern,
                   const QString& label, QColor labelColor );

        double m_value;
        QColor m_valueColor;
        int m_valuePattern;
        QString m_label;
        QColor m_labelColor;
        double m_propoints[2 * MAX_PROPOINTS];
    };

    QTextStream &operator<<( QTextStream&, const Element& );
    QTextStream &operator>>( QTextStream&, Element& );

    #endif