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

        #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