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diff --git a/kpovmodeler/pmrendermanager.h b/kpovmodeler/pmrendermanager.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 PMRENDERMANAGER_H
+#define PMRENDERMANAGER_H
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include "pmcontrolpoint.h"
+#include "pmmatrix.h"
+#include "pmobject.h"
+#include "pmviewstructure.h"
+
+#include <qobject.h>
+#include <qptrlist.h>
+#include <qcolor.h>
+#include <qptrstack.h>
+#include <qvaluestack.h>
+#include <kstaticdeleter.h>
+#include <GL/gl.h>
+
+class PMGLView;
+class PMCamera;
+class PMPoint;
+class KConfig;
+class QString;
+
+/**
+ * Used internally by PMRenderManager.
+ *
+ * This class stores informations for one render task.
+ */
+class PMRenderTask
+{
+public:
+   PMRenderTask( PMGLView* view, PMObject* active, PMObject* top,
+                 PMControlPointList* controlPoints, double aspectRatio,
+                 int visibilityLevel )
+   {
+      m_pView = view;
+      m_pActiveObject = active;
+      m_pTopLevelObject = top;
+      m_pControlPoints = controlPoints;
+      m_aspectRatio = aspectRatio;
+      m_visibilityLevel = visibilityLevel;
+   }
+   
+   ~PMRenderTask( ) { };
+   
+   PMGLView* view( ) const { return m_pView; }
+   PMObject* activeObject( ) const { return m_pActiveObject; }
+   PMObject* topLevelObject( ) const { return m_pTopLevelObject; }
+   PMControlPointList* controlPoints( ) const { return m_pControlPoints; }
+   double aspectRatio( ) const { return m_aspectRatio; }
+   int visibilityLevel( ) const { return m_visibilityLevel; }
+
+   void setView( PMGLView* view ) { m_pView = view; }
+   void setActiveObject( PMObject* obj ) { m_pActiveObject = obj; }
+   void setTopLevelObject( PMObject* obj ) { m_pTopLevelObject = obj; }
+   void setControlPoints( PMControlPointList* list ) { m_pControlPoints = list; }
+   void setAspectRatio( double ar ) { m_aspectRatio = ar; }
+   void setVisibilityLevel( int l ) { m_visibilityLevel = l; }
+   
+private:
+   PMGLView* m_pView;
+   PMObject* m_pActiveObject;
+   PMObject* m_pTopLevelObject;
+   PMControlPointList* m_pControlPoints;
+   double m_aspectRatio;
+   int m_visibilityLevel;
+};
+
+typedef QPtrList<PMRenderTask> PMRenderTaskList;
+typedef QPtrListIterator<PMRenderTask> PMRenderTaskListIterator;
+
+/**
+ * Class that controls the background rendering
+ */
+class PMRenderManager : public QObject
+{
+   Q_OBJECT
+public:
+   /**
+    * Returns a pointer to the render manager
+    */
+   static PMRenderManager* theManager( );
+   /**
+    * destructor
+    */
+   ~PMRenderManager( );
+   /**
+    * Adds the @ref PMGLView to the list of views that have to be rendered.
+    *
+    * @param view The view
+    * @param active The active object
+    * @param top The top level object (normally the scene)
+    * @param controlPoints A pointer to the list of control points for the
+    *        active object
+    * @param graphicalChange If true the view will be rendered with higher
+    *        priority
+    */
+   void addView( PMGLView* view, PMObject* active, PMObject* top,
+                 PMControlPointList* controlPoints, double aspectRatio,
+                 int visibilityLevel, bool graphicalChange );
+   /**
+    * Removes the view from the list of views that have to be rendered
+    */
+   void removeView( PMGLView* view );
+
+   /**
+    * Call this method if a PMGLView was created
+    */
+   void viewCreated( ) { m_nViews++; }
+   /**
+    * Call this method if a PMGLView was deleted
+    */
+   void viewDeleted( ) { m_nViews--; }
+
+   /**
+    * Returns true if the render manager holds a task for the view
+    */
+   bool containsTask( PMGLView* view ) const;
+
+   /**
+    * Returns the color for the control points
+    */
+   QColor controlPointColor( int i ) const;
+   /**
+    * Sets the control point color
+    */
+   void setControlPointColor( int i, const QColor& c );
+   /**
+    * Returns the color for graphical objects
+    */
+   QColor graphicalObjectColor( int i ) const;
+   /**
+    * Sets the graphical object color
+    */
+   void setGraphicalObjectColor( int i, const QColor& c );
+   /**
+    * Returns the color for the coordinate axes
+    */
+   QColor axesColor( int i ) const;
+   /**
+    * Sets the axes color
+    */
+   void setAxesColor( int i, const QColor& c );
+   /**
+    * Returns the background color
+    */
+   QColor backgroundColor( ) const { return m_backgroundColor; }
+   /**
+    * Sets the background color
+    */
+   void setBackgroundColor( const QColor& c ) { m_backgroundColor = c; }
+   /**
+    * Returns the field of view color.
+    */
+   QColor fieldOfViewColor( ) const { return m_fieldOfViewColor; }
+   /**
+    * Sets the field of view color
+    */
+   void setFieldOfViewColor( const QColor& c ) { m_fieldOfViewColor = c; }
+   
+   /**
+    * Sets the grid color
+    */
+   void setGridColor( const QColor& c ) { m_gridColor = c; }
+   /**
+    * Returns the grid color
+    */
+   QColor gridColor( ) { return m_gridColor; }
+   /**
+    * Sets the grid distance
+    */
+   void setGridDistance( int d );
+   /**
+    * Returns the grid distance
+    */
+   int gridDistance( ) { return m_gridDistance; }
+
+   /**
+    * Returns true if the camera views with complex projections
+    * are rendered with high detail
+    */
+   bool highDetailCameraViews( ) const { return m_highDetailCameraView; }
+   /**
+    * Sets the highDetailCameraView flag
+    */
+   void setHighDetailCameraViews( bool yes ) { m_highDetailCameraView = yes; }
+   
+   /**
+    * Sets the gl drawing color
+    */
+   static void setGLColor( const QColor& c );
+
+   /**
+    * Saves the configuration
+    */
+   void saveConfig( KConfig* cfg );
+   /**
+    * Restores the configuration
+    */
+   void restoreConfig( KConfig* cfg );
+
+   /**
+    * Returns true if the glx extension is available
+    */
+   static bool hasOpenGL( );
+   /**
+    * Disables OpenGL rendering
+    */
+   static void disableOpenGL( );
+   
+public slots:
+   /**
+    * Stops rendering
+    */
+   void slotStopRendering( );
+   /**
+    * Call this when rendering settings have been changed
+    */
+   void slotRenderingSettingsChanged( );
+   
+signals:
+   /**
+    * Emitted when rendering starts for the view v
+    */
+   void renderingStarted( PMGLView* v );
+   /**
+    * Emitted just before the view is updated
+    */
+   void aboutToUpdate( PMGLView* v );
+   /**
+    * Emitted when rendering has been finished for the view v
+    */
+   void renderingFinished( PMGLView* v );
+   /**
+    * Emitted when rendering settings (colors ...) have been changed
+    */
+   void renderingSettingsChanged( );
+   /**
+    * Emitted when rendering has started
+    */
+   void renderingStarted( );
+   /**
+    * Emitted when rendering has finished
+    */
+   void renderingFinished( );
+   
+protected:
+   virtual void timerEvent( QTimerEvent* );
+   
+private:
+   /**
+    * constructor
+    */
+   PMRenderManager( );
+   
+   /**
+    * Restarts rendering
+    */
+   void restartRendering( );
+   
+   /**
+    * The background task for rendering
+    */
+   void renderTask( );
+   /**
+    * Renders one object
+    */
+   void renderObject( PMObject* obj );
+   /**
+    * Renders the view structure, subdivides the lines in high
+    detail camera views */
+   void renderViewStructure( PMViewStructure& vs );
+   /**
+    * Renders the view structure without subdivisions
+    */
+   void renderViewStructureSimple( PMPointArray& points, PMLineArray& lines,
+                                   int numberOfLines = -1 );
+   /**
+    * Renders the control points
+    */
+   void renderControlPoints( );
+   /**
+    * Draws the grid
+    */
+   void renderGrid( );
+   /**
+    * Draws the coordinate axis
+    */
+   void renderAxes( );
+   /**
+    * Draws the field of view for camera views
+    */
+   void renderFieldOfView( );
+   /**
+    * Draws the view descriptions
+    */
+   void renderDescription( );
+   /**
+    * Renders the string
+    */
+   void renderString( const QString& str, double x, double y );
+   
+   /**
+    * Transforms and renders the view structure for special
+    * camera projection types.
+    */
+   void transformProjection( PMPoint* points, int size, PMCamera* camera );
+   /**
+    * Sets the projection for the current view
+    */
+   void setProjection( );
+   /**
+    * Sets the projection for a camera view
+    */
+   void setCameraProjection( );
+
+   /**
+    * Calculates the view transformation for the camera c
+    */
+   PMMatrix viewTransformation( PMCamera* c ) const;
+
+   /**
+    * List of render tasks. The first has the highest priority
+    */
+   QPtrList<PMRenderTask> m_renderTasks;
+   /**
+    * Flag for background rendering
+    */
+   bool m_bStopTask, m_bStartTask, m_bTaskIsRunning;
+   /**
+    * The color for view structures of graphical objects.
+    *
+    * index 0: normal color, 1: selected
+    */
+   QColor m_graphicalObjectColor[2];
+   /**
+    * The color for view structures of textures
+    */
+   QColor m_textureColor[2];
+   /**
+    * The color for the coordinate axes
+    */
+   QColor m_axesColor[3];
+   /**
+    * The background color
+    */
+   QColor m_backgroundColor;
+   /**
+    * color for control points
+    *
+    * index 0: normal color, 1: selected
+    */
+   QColor m_controlPointColor[2];
+   /**
+    * Color for the field of view box
+    */
+   QColor m_fieldOfViewColor;
+   
+   /**
+    * Grid distance and color
+    */
+   int m_gridDistance;
+   QColor m_gridColor;
+   /**
+    * If true, lines are subdivided in camera views with complex
+    * projections
+    */
+   bool m_highDetailCameraView;
+   
+   /**
+    * Number of rendered lines between calls of processEvents( )
+    */
+   unsigned int m_nMaxRenderedLines;
+
+   /**
+    * Number of gl views
+    */
+   unsigned int m_nViews;
+   /**
+    * The render manager (singleton pattern)
+    */
+   static PMRenderManager* s_pManager;
+   static KStaticDeleter<PMRenderManager> s_staticDeleter;
+
+   // Member variables to save stack space during rendering
+   PMRenderTask* m_pCurrentTask;
+   PMGLView* m_pCurrentGlView;
+   QPtrStack<PMMatrix> m_matrixStack; // I don't know if the build in gl matrix stack is deep enough
+   bool m_selected;
+   PMObject* m_pDeselectObject;
+   PMObjectList m_objectToRenderStack;
+   QPtrStack<PMObject> m_quickColorObjects;
+   QPtrStack<QColor> m_quickColors;
+   QColor m_currentColor;
+   QValueStack<int> m_visibilityStack;
+   int m_currentVisibility;
+   unsigned int m_renderedLines;
+   PMMatrix m_controlPointTransformation;
+
+   // for transformProjection
+   bool m_specialCameraMode;
+   PMMatrix m_viewTransformation;
+   double m_upLength, m_rightLength, m_directionLength;
+   double m_anglex, m_angley;
+   PMViewStructure m_subdivisionViewStructure;
+
+   PMViewStructure m_axesViewStructure[3];
+   bool m_axesViewStructureCreated;
+
+   static bool s_hasOpenGL;
+   static bool s_hasOpenGLChecked;
+};
+
+#endif