diff --git a/src/scrollzoomer.h b/src/scrollzoomer.h
new file mode 100644
--- /dev/null
+++ b/src/scrollzoomer.h
@@ -0,0 +1,76 @@
+/*
+  Copyright © 2014 Uwe Rathmann
+
+  This file is copied from Qwt project; you can redistribute it and/or modify it
+  under the terms of the Qwt License, Version 1.0. You can obtain the original
+  source code and the details of the Qwt License from the Qwt website:
+  http://qwt.sourceforge.net/
+*/
+
+#ifndef _SCROLLZOOMER_H
+#define _SCROLLZOOMER_H
+
+#include <qglobal.h>
+#include <qwt_plot_zoomer.h>
+#include <qwt_plot.h>
+
+class ScrollData;
+class ScrollBar;
+
+class ScrollZoomer: public QwtPlotZoomer
+{
+    Q_OBJECT
+public:
+    enum ScrollBarPosition
+    {
+        AttachedToScale,
+        OppositeToScale
+    };
+
+    ScrollZoomer( QWidget * );
+    virtual ~ScrollZoomer();
+
+    ScrollBar *horizontalScrollBar() const;
+    ScrollBar *verticalScrollBar() const;
+
+    void setHScrollBarMode( Qt::ScrollBarPolicy );
+    void setVScrollBarMode( Qt::ScrollBarPolicy );
+
+    Qt::ScrollBarPolicy vScrollBarMode () const;
+    Qt::ScrollBarPolicy hScrollBarMode () const;
+
+    void setHScrollBarPosition( ScrollBarPosition );
+    void setVScrollBarPosition( ScrollBarPosition );
+
+    ScrollBarPosition hScrollBarPosition() const;
+    ScrollBarPosition vScrollBarPosition() const;
+
+    QWidget* cornerWidget() const;
+    virtual void setCornerWidget( QWidget * );
+
+    virtual bool eventFilter( QObject *, QEvent * );
+
+    virtual void rescale();
+
+protected:
+    virtual ScrollBar *scrollBar( Qt::Orientation );
+    virtual void updateScrollBars();
+    virtual void layoutScrollBars( const QRect & );
+
+private Q_SLOTS:
+    void scrollBarMoved( Qt::Orientation o, double min, double max );
+
+private:
+    bool needScrollBar( Qt::Orientation ) const;
+    int oppositeAxis( int ) const;
+
+    QWidget *d_cornerWidget;
+
+    ScrollData *d_hScrollData;
+    ScrollData *d_vScrollData;
+
+    bool d_inZoom;
+    bool d_alignCanvasToScales[ QwtPlot::axisCnt ];
+};
+
+#endif