mandelbrotwidget.h Example File

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 #ifndef MANDELBROTWIDGET_H
 #define MANDELBROTWIDGET_H

 #include <QPixmap>
 #include <QWidget>
 #include "renderthread.h"

 #if defined(Q_WS_S60) || defined(Q_WS_MAEMO_5) || defined(Q_WS_SIMULATOR)
 #include <QPushButton>

 class ZoomButton : public QPushButton
 {
     Q_OBJECT
 public:
     ZoomButton(const QString &text, double zoomFactor, QWidget *parent = NULL)
         : QPushButton(text, parent), m_ZoomFactor(zoomFactor)
     {
         connect(this, SIGNAL(clicked()), this, SLOT(handleClick()));
     }

 signals:
     void zoom(double zoomFactor);

 private slots:
     void handleClick()
     {
         emit zoom(m_ZoomFactor);
     }

 private:
     const double m_ZoomFactor;
 };
 #endif

 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);
     void zoom(double zoomFactor);

 private:
     void scroll(int deltaX, int deltaY);

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

 #endif