TGLCameraOverlay.h

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// @(#)root/gl:$Id$
// Author: Alja Mrak-Tadel 2007
 
/*************************************************************************
 * Copyright (C) 1995-2007, Rene Brun and Fons Rademakers.               *
 * All rights reserved.                                                  *
 *                                                                       *
 * For the licensing terms see $ROOTSYS/LICENSE.                         *
 * For the list of contributors see $ROOTSYS/README/CREDITS.             *
 *************************************************************************/
 
#ifndef ROOT_TGLCameraOverlay
#define ROOT_TGLCameraOverlay
 
#include "TAttAxis.h"
#include "TGLOverlay.h"
#include "TGLUtil.h"
 
class TGLAxisPainter;
class TGLFont;
 
class TAttAxis;
class TAxis;
 
class TGLCameraOverlay : public TGLOverlayElement
{
public:
   enum EMode { kPlaneIntersect, kBar, kAxis, kGridFront, kGridBack };
 
private:
   TGLCameraOverlay(const TGLCameraOverlay&);            // Not implemented
   TGLCameraOverlay& operator=(const TGLCameraOverlay&); // Not implemented
 
protected:
   Bool_t         fShowOrthographic;
   Bool_t         fShowPerspective;
 
   EMode          fOrthographicMode;
   EMode          fPerspectiveMode;
 
   TGLAxisPainter *fAxisPainter;
   TAxis          *fAxis;
   Float_t         fAxisExtend;
   Bool_t          fUseAxisColors;
 
   TGLPlane       fExternalRefPlane;
   Bool_t         fUseExternalRefPlane;
 
   Double_t       fFrustum[4];
 
 
   void    RenderPlaneIntersect(TGLRnrCtx& rnrCtx);
   void    RenderAxis(TGLRnrCtx& rnrCtx, Bool_t drawGrid);
   void    RenderGrid(TGLRnrCtx& rnrCtx);
   void    RenderBar(TGLRnrCtx& rnrCtx);
 
public:
   TGLCameraOverlay(Bool_t showOrtho=kTRUE, Bool_t showPersp=kFALSE);
   virtual ~TGLCameraOverlay();
 
   virtual  void   Render(TGLRnrCtx& rnrCtx);
 
   TGLPlane& RefExternalRefPlane() { return fExternalRefPlane; }
   void      UseExternalRefPlane(Bool_t x) { fUseExternalRefPlane=x; }
   Bool_t    GetUseExternalRefPlane() const { return fUseExternalRefPlane; }
 
   Int_t    GetPerspectiveMode() const { return fPerspectiveMode;}
   void     SetPerspectiveMode(EMode m) {fPerspectiveMode = m;}
   Int_t    GetOrthographicMode() const { return fOrthographicMode;}
   void     SetOrthographicMode(EMode m) {fOrthographicMode = m;}
 
   Bool_t   GetShowOrthographic() const { return fShowOrthographic; }
   void     SetShowOrthographic(Bool_t x) {fShowOrthographic =x;}
   Bool_t   GetShowPerspective() const { return fShowPerspective; }
   void     SetShowPerspective(Bool_t x) {fShowPerspective =x;}
 
   void     SetFrustum(TGLCamera& cam);
 
   TAttAxis* GetAttAxis();
 
   ClassDef(TGLCameraOverlay, 1); // Show coorinates of current camera frustum.
};
 
#endif