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

/****************************************************************************
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** Copyright (C) 2004-2006 Trolltech ASA. All rights reserved.
**
** This file is part of the example classes of the Qt Toolkit.
**
** Licensees holding valid Qt Preview licenses may use this file in
** accordance with the Qt Preview License Agreement provided with the
** Software.
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** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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#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


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Qt 4.2.0-rc1