renderarea.h Example File
painting/basicdrawing/renderarea.h
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    #ifndef RENDERAREA_H
    #define RENDERAREA_H
    #include <QBrush>
    #include <QPen>
    #include <QPixmap>
    #include <QWidget>
    class RenderArea : public QWidget
    {
        Q_OBJECT
    public:
        enum Shape { Line, Points, Polyline, Polygon, Rect, RoundRect, Ellipse, Arc,
                     Chord, Pie, Path, Text, Pixmap };
        RenderArea(QWidget *parent = 0);
        QSize minimumSizeHint() const;
        QSize sizeHint() const;
    public slots:
        void setShape(Shape shape);
        void setPen(const QPen &pen);
        void setBrush(const QBrush &brush);
        void setAntialiased(bool antialiased);
        void setTransformed(bool transformed);
    protected:
        void paintEvent(QPaintEvent *event);
    private:
        Shape shape;
        QPen pen;
        QBrush brush;
        bool antialiased;
        bool transformed;
        QPixmap pixmap;
    };
    #endif