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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