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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


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Qt 4.0.1