renderarea.h Example File
painting/painterpaths/renderarea.h

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 #ifndef RENDERAREA_H
 #define RENDERAREA_H

 #include <QPainterPath>
 #include <QWidget>

 class RenderArea : public QWidget
 {
     Q_OBJECT

 public:
     RenderArea(const QPainterPath &path, QWidget *parent = 0);

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

 public slots:
     void setFillRule(Qt::FillRule rule);
     void setFillGradient(const QColor &color1, const QColor &color2);
     void setPenWidth(int width);
     void setPenColor(const QColor &color);
     void setRotationAngle(int degrees);

 protected:
     void paintEvent(QPaintEvent *event);

 private:
     QPainterPath path;
     QColor fillColor1;
     QColor fillColor2;
     int penWidth;
     QColor penColor;
     int rotationAngle;
 };

 #endif