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diff --git a/kpovmodeler/pmcontrolpoint.h b/kpovmodeler/pmcontrolpoint.h
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+//-*-C++-*-
+/*
+**************************************************************************
+                                 description
+                             --------------------
+    copyright            : (C) 2000-2001 by Andreas Zehender
+    email                : zehender@kde.org
+**************************************************************************
+
+**************************************************************************
+*                                                                        *
+*  This program is free software; you can redistribute it and/or modify  *
+*  it under the terms of the GNU General Public License as published by  *
+*  the Free Software Foundation; either version 2 of the License, or     *
+*  (at your option) any later version.                                   *
+*                                                                        *
+**************************************************************************/
+
+
+#ifndef PMCONTROLPOINT_H
+#define PMCONTROLPOINT_H
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include "pmvector.h"
+#include <qptrlist.h>
+#include <qstring.h>
+
+class KConfig;
+
+/**
+ * Interface between the graphical views and the PMObject.
+ *
+ * PMControlPoint is the interface between graphical view and PMObjects that
+ * can be changed graphically with the mouse. A @ref PMObject has a
+ * PMControlPoint for each changeable attribute.
+ *
+ * There is one subclass for each change behavior like 3dpoint, normal vector,
+ * radius, rotation ...
+ *
+ * Each control point has an id to be indentified by the PMObject. The id has
+ * to be unique within a PMObject.
+ */
+
+class PMControlPoint
+{
+public:
+   /**
+    * Creates a PMControlPoint with an id and a description.
+    */
+   PMControlPoint( int id, const QString& description );
+   /**
+    * Deletes the PMControlPoint
+    */
+   virtual ~PMControlPoint( );
+   
+   /**
+    * Starts a graphical change at 3d cursor position startPoint. viewNormal
+    * is the normal vector of the view
+    */
+   void startChange( const PMVector& startPoint, const PMVector& viewNormal );
+   /**
+    * Graphical change with 3d end cursor position endPoint
+    */
+   void change( const PMVector& endPoint );
+   /**
+    * Snaps the control point to the grid
+    */
+   virtual void snapToGrid( ) = 0;
+   
+   /**
+    * 3d coordinates of the control point for rendering*/
+   virtual PMVector position( ) const { return PMVector( ); }
+   /**
+    * Returns true if the point should be displayed (rendered)
+    */
+   virtual bool display( ) const { return true; }
+   /**
+    * Returns the id of the control point
+    */
+   int id( ) const { return m_id; }
+   /**
+    * Type of the control point
+    *
+    * CPPoint: The control point is displayed as point, the mouse cursor
+    * has to be over the control point to be active (e.g. 3DControlPoint)
+    *
+    * CPCross: The control point is displayed as cross, the control point
+    * can be changed with the mouse in the whole view (e.g. Translation)
+    */
+   enum PMCPDisplayType { CPPoint = 0, CPCross = 1 };
+   /**
+    * Returns the type of the control point (see @ref PMCPDisplayType)
+    */
+   virtual PMCPDisplayType displayType( ) const { return CPPoint; };
+   /**
+    * Returns the description
+    */
+   QString description( ) const { return m_description; }
+   /**
+    * Selects/deselects the control point
+    */
+   void setSelected( bool yes ) { m_bSelected = yes; }
+   /**
+    * Returns true if the control point is selected
+    */
+   bool selected( ) const { return m_bSelected; }
+
+   /**
+    * Returns true, if the control point was changed and sets the
+    * changed flag to false.
+    */
+   bool changed( );
+
+   /**
+    * Returns true if an extra line should be displayed in addition to
+    * the view structure
+    */
+   virtual bool hasExtraLine( ) const { return false; }
+   /**
+    * Returns the start point of the extra line
+    */
+   virtual PMVector extraLineStart( ) const { return PMVector( 0, 0, 0 ); }
+   /**
+    * Returns the end point of the extra line
+    */
+   virtual PMVector extraLineEnd( ) const { return PMVector( 0, 0, 0 ); }
+   
+   /**
+    * Returns the grid distance for 3d points, vectors and movements
+    */
+   static double moveGrid( ) { return s_moveGrid; }
+   /**
+    * Sets the grid distance
+    */
+   static void setMoveGrid( double d );
+   /**
+    * Returns the grid distance rotations
+    */
+   static double rotateGrid( ) { return s_rotateGrid; }
+   /**
+    * Sets the grid distance
+    */
+   static void setRotateGrid( double d );
+   /**
+    * Returns the grid distance for scales
+    */
+   static double scaleGrid( ) { return s_scaleGrid; }
+   /**
+    * Sets the grid distance
+    */
+   static void setScaleGrid( double d );
+   
+   static void saveConfig( KConfig* cfg );
+   static void restoreConfig( KConfig* cfg );
+   
+protected:
+   /**
+    * Called when a graphical change was started
+    */
+   virtual void graphicalChangeStarted( ) = 0;
+   /**
+    * Called when the control point was changed
+    */
+   virtual void graphicalChange( const PMVector& startPoint,
+                                 const PMVector& viewNormal,
+                                 const PMVector& endPoint ) = 0;
+   /**
+    * Sets the changed flag
+    */
+   void setChanged( ) { m_bChanged = true; }
+private:
+   int m_id;
+   PMVector m_startPoint;
+   PMVector m_normalVector;
+   bool m_bChanged;
+   bool m_bSelected;
+   QString m_description;
+
+   static double s_moveGrid;
+   static double s_rotateGrid;
+   static double s_scaleGrid;
+};
+
+typedef QPtrList<PMControlPoint> PMControlPointList;
+typedef QPtrListIterator<PMControlPoint> PMControlPointListIterator;
+
+#endif