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# mandelbrotwidget.h Example File
threads/mandelbrot/mandelbrotwidget.h

     /****************************************************************************
     **
     ** Copyright (C) 2004-$THISYEAR$ $TROLLTECH$. All rights reserved.
     **
     ** This file is part of the $MODULE$ of the Qt Toolkit.
     **
     ** $TROLLTECH_DUAL_LICENSE$
     **
     ** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
     ** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
     **
     ****************************************************************************/

     #ifndef MANDELBROTWIDGET_H
     #define MANDELBROTWIDGET_H

     #include <QPixmap>
     #include <QWidget>

     #include "renderthread.h"

     class MandelbrotWidget : public QWidget
     {
         Q_OBJECT

     public:
         MandelbrotWidget(QWidget *parent = 0);

     protected:
         void paintEvent(QPaintEvent *event);
         void resizeEvent(QResizeEvent *event);
         void keyPressEvent(QKeyEvent *event);
         void wheelEvent(QWheelEvent *event);
         void mousePressEvent(QMouseEvent *event);
         void mouseMoveEvent(QMouseEvent *event);
         void mouseReleaseEvent(QMouseEvent *event);

     private slots:
         void updatePixmap(const QImage &image, double scaleFactor);

     private:
         void zoom(double zoomFactor);
         void scroll(int deltaX, int deltaY);

         RenderThread thread;
         QPixmap pixmap;
         QPoint pixmapOffset;
         QPoint lastDragPos;
         double centerX;
         double centerY;
         double pixmapScale;
         double curScale;
     };

     #endif