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diff --git a/lib/tqwtplot3d/include/qwt3d_parametricsurface.h b/lib/tqwtplot3d/include/qwt3d_parametricsurface.h
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+++ b/lib/tqwtplot3d/include/qwt3d_parametricsurface.h
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+#ifndef qwt3d_parametricsurface_h__2004_03_05_23_43_begin_guarded_code
+#define qwt3d_parametricsurface_h__2004_03_05_23_43_begin_guarded_code
+
+#include "qwt3d_gridmapping.h"
+
+namespace Qwt3D
+{
+
+class SurfacePlot;
+
+
+//! Abstract base class for parametric surfaces
+/**
+
+*/
+class QWT3D_EXPORT ParametricSurface : public GridMapping
+{
+
+public:
+  ParametricSurface(); //!< Constructs ParametricSurface object w/o assigned SurfacePlot.
+  //! Constructs ParametricSurface object and assigns a SurfacePlot
+  explicit ParametricSurface(Qwt3D::SurfacePlot& plotWidget); 
+  //! Constructs ParametricSurface object and assigns a SurfacePlot
+  explicit ParametricSurface(Qwt3D::SurfacePlot* plotWidget); 
+  //! Overwrite this
+  virtual Qwt3D::Triple operator()(double u, double v) = 0; 
+	//! 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);
+  //! Provide information about periodicity of the 'u' resp. 'v' domains.
+  void setPeriodic(bool u, bool v); 
+
+private:
+  bool uperiodic_, vperiodic_;
+};
+
+} // ns
+
+#endif /* include guarded */