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glwidget.h Example File
^{opengl/2dpainting/glwidget.h}

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 #ifndef GLWIDGET_H
 #define GLWIDGET_H

 #include <QGLWidget>

 class Helper;
 class QPaintEvent;
 class QWidget;

 class GLWidget : public QGLWidget
 {
     Q_OBJECT

 public:
     GLWidget(Helper *helper, QWidget *parent);

 public slots:
     void animate();

 protected:
     void paintEvent(QPaintEvent *event);

 private:
     Helper *helper;
     int elapsed;
 };

 #endif