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diff --git a/src/libpcp_qwt/src/qwt_matrix_raster_data.h b/src/libpcp_qwt/src/qwt_matrix_raster_data.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_MATRIX_RASTER_DATA_H
+#define QWT_MATRIX_RASTER_DATA_H 1
+
+#include "qwt_global.h"
+#include "qwt_raster_data.h"
+#include <qvector.h>
+
+/*!
+  \brief A class representing a matrix of values as raster data
+
+  QwtMatrixRasterData implements an interface for a matrix of
+  equidistant values, that can be used by a QwtPlotRasterItem. 
+  It implements a couple of resampling algorithms, to provide
+  values for positions, that or not on the value matrix.
+*/
+class QWT_EXPORT QwtMatrixRasterData: public QwtRasterData
+{
+public:
+    /*!
+      \brief Resampling algorithm
+      The default setting is NearestNeighbour;
+    */
+    enum ResampleMode
+    {
+        /*!
+          Return the value from the matrix, that is nearest to the
+          the requested position.
+         */
+        NearestNeighbour,
+
+        /*!
+          Interpolate the value from the distances and values of the 
+          4 surrounding values in the matrix,
+         */
+        BilinearInterpolation
+    };
+
+    QwtMatrixRasterData();
+    virtual ~QwtMatrixRasterData();
+
+    void setResampleMode(ResampleMode mode);
+    ResampleMode resampleMode() const;
+
+    virtual void setInterval( Qt::Axis, const QwtInterval & );
+    void setValueMatrix( const QVector<double> &values, size_t numColumns );
+    
+    const QVector<double> valueMatrix() const;
+    size_t numColumns() const;
+    size_t numRows() const;
+
+    virtual QRectF pixelHint( const QRectF & ) const;
+
+    virtual double value( double x, double y ) const;
+
+private:
+    void update();
+
+    class PrivateData;
+    PrivateData *d_data;
+};
+
+#endif