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window.h Example File
^{painting/transformations/window.h}

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    #ifndef WINDOW_H
    #define WINDOW_H

    #include <QList>
    #include <QPainterPath>
    #include <QWidget>

    #include "renderarea.h"

    class QComboBox;

    class Window : public QWidget
    {
        Q_OBJECT

    public:
        Window();

    public slots:
        void operationChanged();
        void shapeSelected(int index);

    private:
        void setupShapes();

        enum { NumTransformedAreas = 3 };
        RenderArea *originalRenderArea;
        RenderArea *transformedRenderAreas[NumTransformedAreas];
        QComboBox *shapeComboBox;
        QComboBox *operationComboBoxes[NumTransformedAreas];
        QList<QPainterPath> shapes;
    };

    #endif