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paintarea.h Example File
tools/plugandpaint/paintarea.h

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 #ifndef PAINTAREA_H
 #define PAINTAREA_H

 #include <QColor>
 #include <QImage>
 #include <QPainterPath>
 #include <QWidget>

 class BrushInterface;

 class PaintArea : public QWidget
 {
     Q_OBJECT

 public:
     PaintArea(QWidget *parent = 0);

     bool openImage(const QString &fileName);
     bool saveImage(const QString &fileName, const char *fileFormat);
     void setImage(const QImage &image);
     void insertShape(const QPainterPath &path);
     void setBrushColor(const QColor &color);
     void setBrushWidth(int width);
     void setBrush(BrushInterface *brushInterface, const QString &brush);

     QImage image() const { return theImage; }
     QColor brushColor() const { return color; }
     int brushWidth() const { return thickness; }
     QSize sizeHint() const;

 protected:
     void paintEvent(QPaintEvent *event);
     void mousePressEvent(QMouseEvent *event);
     void mouseMoveEvent(QMouseEvent *event);
     void mouseReleaseEvent(QMouseEvent *event);

 private:
     void setupPainter(QPainter &painter);

     QImage theImage;
     QColor color;
     int thickness;

     BrushInterface *brushInterface;
     QString brush;
     QPoint lastPos;

     QPainterPath pendingPath;
 };

 #endif

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