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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, RoundedRect, 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