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diff --git a/src/libpcp_qwt/src/qwt_plot_rescaler.h b/src/libpcp_qwt/src/qwt_plot_rescaler.h
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+/* -*- mode: C++ ; c-file-style: "stroustrup" -*- *****************************
+ * Qwt Widget Library
+ * Copyright (C) 1997   Josef Wilgen
+ * Copyright (C) 2002   Uwe Rathmann
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the Qwt License, Version 1.0
+ *****************************************************************************/
+
+#ifndef QWT_PLOT_RESCALER_H
+#define QWT_PLOT_RESCALER_H 1
+
+#include "qwt_global.h"
+#include "qwt_interval.h"
+#include "qwt_plot.h"
+#include <qobject.h>
+
+class QwtPlotCanvas;
+class QwtPlot;
+class QResizeEvent;
+
+/*!
+    \brief QwtPlotRescaler takes care of fixed aspect ratios for plot scales
+
+    QwtPlotRescaler autoadjusts the axes of a QwtPlot according
+    to fixed aspect ratios.
+*/
+
+class QWT_EXPORT QwtPlotRescaler: public QObject
+{
+public:
+    /*!
+      The rescale policy defines how to rescale the reference axis and
+      their depending axes.
+
+      \sa ExpandingDirection, setIntervalHint()
+    */
+    enum RescalePolicy
+    {
+        /*!
+          The interval of the reference axis remains unchanged, when the
+          geometry of the canvas changes. All other axes
+          will be adjusted according to their aspect ratio.
+         */
+        Fixed,
+
+        /*!
+          The interval of the reference axis will be shrinked/expanded,
+          when the geometry of the canvas changes. All other axes
+          will be adjusted according to their aspect ratio.
+
+          The interval, that is represented by one pixel is fixed.
+
+         */
+        Expanding,
+
+        /*!
+          The intervals of the axes are calculated, so that all axes include
+          their interval hint.
+         */
+        Fitting
+    };
+
+    /*!
+       When rescalePolicy() is set to Expanding its direction depends
+       on ExpandingDirection
+     */
+    enum ExpandingDirection
+    {
+        //! The upper limit of the scale is adjusted
+        ExpandUp,
+
+        //! The lower limit of the scale is adjusted
+        ExpandDown,
+
+        //! Both limits of the scale are adjusted
+        ExpandBoth
+    };
+
+    explicit QwtPlotRescaler( QwtPlotCanvas *,
+        int referenceAxis = QwtPlot::xBottom,
+        RescalePolicy = Expanding );
+
+    virtual ~QwtPlotRescaler();
+
+    void setEnabled( bool );
+    bool isEnabled() const;
+
+    void setRescalePolicy( RescalePolicy );
+    RescalePolicy rescalePolicy() const;
+
+    void setExpandingDirection( ExpandingDirection );
+    void setExpandingDirection( int axis, ExpandingDirection );
+    ExpandingDirection expandingDirection( int axis ) const;
+
+    void setReferenceAxis( int axis );
+    int referenceAxis() const;
+
+    void setAspectRatio( double ratio );
+    void setAspectRatio( int axis, double ratio );
+    double aspectRatio( int axis ) const;
+
+    void setIntervalHint( int axis, const QwtInterval& );
+    QwtInterval intervalHint( int axis ) const;
+
+    QwtPlotCanvas *canvas();
+    const QwtPlotCanvas *canvas() const;
+
+    QwtPlot *plot();
+    const QwtPlot *plot() const;
+
+    virtual bool eventFilter( QObject *, QEvent * );
+
+    void rescale() const;
+
+protected:
+    virtual void canvasResizeEvent( QResizeEvent * );
+
+    virtual void rescale( const QSize &oldSize, const QSize &newSize ) const;
+    virtual QwtInterval expandScale( 
+        int axis, const QSize &oldSize, const QSize &newSize ) const;
+
+    virtual QwtInterval syncScale(
+        int axis, const QwtInterval& reference,
+        const QSize &size ) const;
+
+    virtual void updateScales(
+        QwtInterval intervals[QwtPlot::axisCnt] ) const;
+
+    Qt::Orientation orientation( int axis ) const;
+    QwtInterval interval( int axis ) const;
+    QwtInterval expandInterval( const QwtInterval &,
+        double width, ExpandingDirection ) const;
+
+private:
+    double pixelDist( int axis, const QSize & ) const;
+
+    class AxisData;
+    class PrivateData;
+    PrivateData *d_data;
+};
+
+#endif