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diff --git a/lib/tqwtplot3d/include/qwt3d_function.h b/lib/tqwtplot3d/include/qwt3d_function.h
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+++ b/lib/tqwtplot3d/include/qwt3d_function.h
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+#ifndef qwt3d_function_h__2004_03_05_13_51_begin_guarded_code
+#define qwt3d_function_h__2004_03_05_13_51_begin_guarded_code
+
+#include "qwt3d_gridmapping.h"
+
+namespace Qwt3D
+{
+
+class SurfacePlot;
+
+//! Abstract base class for mathematical functions
+/**
+	A Function encapsulates a mathematical function with rectangular domain. The user has to adapt the pure virtual operator() 
+	to get a working object. Also, the client code should call setDomain, setMesh and create for reasonable operating conditions.
+*/
+class QWT3D_EXPORT Function : public GridMapping
+{
+
+public:
+	
+  Function(); //!< Constructs Function object w/o assigned SurfacePlot.
+  explicit Function(Qwt3D::SurfacePlot& plotWidget); //!< Constructs Function object and assigns a SurfacePlot
+  explicit Function(Qwt3D::SurfacePlot* plotWidget); //!< Constructs Function object and assigns a SurfacePlot
+	virtual double operator()(double x, double y) = 0; //!< Overwrite this.
+		
+	void setMinZ(double val); //!< Sets minimal z value.
+	void setMaxZ(double val); //!< Sets maximal z value.
+
+	//! Assigns a new SurfacePlot and creates a data representation for it.
+	virtual bool create(Qwt3D::SurfacePlot& plotWidget);
+	//! Creates data representation for the actual assigned SurfacePlot.
+	virtual bool create();
+  //! Assigns the object to another widget. To see the changes, you have to call this function before create().
+  void assign(Qwt3D::SurfacePlot& plotWidget); 
+  //! Assigns the object to another widget. To see the changes, you have to call this function before create().
+  void assign(Qwt3D::SurfacePlot* plotWidget); 
+};
+
+} // ns
+
+#endif /* include guarded */