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scribblewidget.h Example File
qws/mousecalibration/scribblewidget.h

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 #ifndef SCRIBBLEWIDGET_H
 #define SCRIBBLEWIDGET_H

 #include <QLabel>
 #include <QMouseEvent>
 #include <QResizeEvent>
 #include <QImage>
 #include <QPainter>

 class ScribbleWidget : public QWidget
 {
 public:
     ScribbleWidget(QWidget *parent = 0);

     void resizeEvent(QResizeEvent *e);
     void mousePressEvent(QMouseEvent *event);
     void mouseMoveEvent(QMouseEvent *event);
     void mouseReleaseEvent(QMouseEvent *event);
     void paintEvent(QPaintEvent *);

 private:
     void drawLineTo(const QPoint &endPoint);

 private:
     bool scribbling;
     QPoint lastPoint;
     QImage image;
 };

 #endif // SCRIBBLEWIDGET_H