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renderarea.h Example File
painting/transformations/renderarea.h

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    #ifndef RENDERAREA_H
    #define RENDERAREA_H

    #include <QFont>
    #include <QList>
    #include <QPainterPath>
    #include <QRect>
    #include <QWidget>

    class QPaintEvent;

    enum Operation { NoTransformation, Translate, Rotate, Scale };

    class RenderArea : public QWidget
    {
        Q_OBJECT

    public:
        RenderArea(QWidget *parent = 0);

        void setOperations(const QList<Operation> &operations);
        void setShape(const QPainterPath &shape);

        QSize minimumSizeHint() const;
        QSize sizeHint() const;

    protected:
        void paintEvent(QPaintEvent *event);

    private:
        void drawCoordinates(QPainter &painter);
        void drawOutline(QPainter &painter);
        void drawShape(QPainter &painter);
        void transformPainter(QPainter &painter);

        QList<Operation> operations;
        QPainterPath shape;
        QRect xBoundingRect;
        QRect yBoundingRect;
    };

    #endif


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Qt 4.0.1