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helper.h Example File
opengl/2dpainting/helper.h

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 #ifndef HELPER_H
 #define HELPER_H

 #include <QBrush>
 #include <QFont>
 #include <QPen>

 class QPainter;
 class QPaintEvent;

 class Helper
 {
 public:
     Helper();

 public:
     void paint(QPainter *painter, QPaintEvent *event, int elapsed);

 private:
     QBrush background;
     QBrush circleBrush;
     QFont textFont;
     QPen circlePen;
     QPen textPen;
 };

 #endif