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bubble.h Example File
opengl/overpainting/bubble.h

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 #ifndef BUBBLE_H
 #define BUBBLE_H

 #include <QBrush>
 #include <QColor>
 #include <QPointF>
 #include <QRect>
 #include <QRectF>

 class QPainter;

 class Bubble
 {
 public:
     Bubble(const QPointF &position, qreal radius, const QPointF &velocity);

     void drawBubble(QPainter *painter);
     void updateBrush();
     void move(const QRect &bbox);
     QRectF rect();

 private:
     QColor randomColor();

     QBrush brush;
     QPointF position;
     QPointF vel;
     qreal radius;
     QColor innerColor;
     QColor outerColor;
 };

 #endif