library: libRGL
#include "TGLCamera.h"

TGLCamera

class description - source file - inheritance tree (.pdf)

class TGLCamera

Inheritance Chart:

TGLCamera

TGLOrthoCamera

TGLPerspectiveCamera

This is an abstract class, constructors will not be documented.
Look at the header to check for available constructors.

    private:

          TGLVertex3 EyePoint() const
      TGLBoundingBox Frustum(Bool_t asBox = kTRUE) const
          TGLCamera& operator=(const TGLCamera&)

    protected:

      Bool_t AdjustAndClampVal(Double_t& val, Double_t min, Double_t max, Int_t screenShift, Int_t screenShiftRange, Bool_t mod1, Bool_t mod2) const
        void UpdateCache()

    public:

              virtual ~TGLCamera()
         virtual void Apply(const TGLBoundingBox& box, const TGLRect* pickRect = 0)
       static TClass* Class()
       virtual Bool_t Dolly(Int_t delta, Bool_t mod1, Bool_t mod2)
                 void DrawDebugAids() const
           TGLVector3 EyeDistances(const TGLBoundingBox& box) const
             EOverlap FrustumOverlap(const TGLBoundingBox& box) const
      virtual TClass* IsA() const
               Bool_t OfInterest(const TGLBoundingBox& box) const
           TGLVector3 ProjectedShift(const TGLVertex3& vertex, Int_t xDelta, Int_t yDelta) const
         virtual void Reset()
                 void ResetInterest()
       virtual Bool_t Rotate(Int_t xDelta, Int_t yDelta)
         virtual void Setup(const TGLBoundingBox& box)
                 void SetViewport(const TGLRect& viewport)
         virtual void ShowMembers(TMemberInspector& insp, char* parent)
         virtual void Streamer(TBuffer& b)
                 void StreamerNVirtual(TBuffer& b)
       virtual Bool_t Truck(Int_t x, Int_t y, Int_t xDelta, Int_t yDelta)
               Bool_t UpdateInterest(Bool_t force)
             EOverlap ViewportOverlap(const TGLBoundingBox& box) const
              TGLRect ViewportSize(const TGLBoundingBox& box) const
       virtual Bool_t Zoom(Int_t delta, Bool_t mod1, Bool_t mod2)

Data Members

    private:

      TGLPlane fFrustumPlanes[6]  !

    protected:

             TGLRect fViewport              ! viewport (GL coords - origin bottom left)
           TGLMatrix fProjM                 ! projection matrix        (cached)
           TGLMatrix fModVM                 ! modelView matrix         (cached)
           TGLMatrix fClipM                 ! object space clip matrix (cached)
              Bool_t fCacheDirty            ! cached items dirty?
      TGLBoundingBox fInterestBox           ! the interest box - created in UpdateInterest()
      TGLBoundingBox fInterestFrustum       ! frustum used to create interest box - debug mode only
      TGLBoundingBox fInterestFrustumAsBox  ! squared off frustum - debug mode only
            Double_t fInterestBoxExpansion  ! expansion c.f. aligned current frustum box
            Double_t fLargestInterest       

    public:

      static const enum TGLCamera:: kNEAR              
      static const enum TGLCamera:: kLEFT              
      static const enum TGLCamera:: kRIGHT             
      static const enum TGLCamera:: kTOP               
      static const enum TGLCamera:: kBOTTOM            
      static const enum TGLCamera:: kFAR               
      static const enum TGLCamera:: kPlanesPerFrustum

Class Description

~TGLCamera()

void SetViewport(const TGLRect & viewport)

void UpdateCache()

 Update internal cached values

TGLVertex3 EyePoint() const

TGLBoundingBox Frustum(Bool_t asBox) const

 Return the the current camera frustum. If asBox == FALSE return
 a true frustum (truncated square based pyramid). If asBox == TRUE
 return a true box, using the far clipping plane intersection projected
 back to the near plane

EOverlap FrustumOverlap(const TGLBoundingBox & box) const

EOverlap ViewportOverlap(const TGLBoundingBox & box) const

 No cached values need here

TGLRect ViewportSize(const TGLBoundingBox & box) const

TGLVector3 ProjectedShift(const TGLVertex3 & vertex, Int_t xDelta, Int_t yDelta) const

TGLVector3 EyeDistances(const TGLBoundingBox & box) const

Bool_t OfInterest(const TGLBoundingBox & box) const

Bool_t UpdateInterest(Bool_t force)

void ResetInterest()

Bool_t AdjustAndClampVal(Double_t & val, Double_t min, Double_t max, Int_t screenShift, Int_t screenShiftRange, Bool_t mod1, Bool_t mod2) const

void DrawDebugAids() const

 Draw out some debugging aids for the camera:

 i) The frustum used to create the current interest box (RED)
 ii) The same frustum as a squared off box (ORANGE)
 iii) The axis aligned version of the frustum used as interest box basis (YELLOW)
 iv) The current interest box (BLUE)

Inline Functions

         TGLCamera& operator=(const TGLCamera&)
               void Setup(const TGLBoundingBox& box)
               void Reset()
             Bool_t Dolly(Int_t delta, Bool_t mod1, Bool_t mod2)
             Bool_t Zoom(Int_t delta, Bool_t mod1, Bool_t mod2)
             Bool_t Truck(Int_t x, Int_t y, Int_t xDelta, Int_t yDelta)
             Bool_t Rotate(Int_t xDelta, Int_t yDelta)
               void Apply(const TGLBoundingBox& box, const TGLRect* pickRect = 0)
            TClass* Class()
            TClass* IsA() const
               void ShowMembers(TMemberInspector& insp, char* parent)
               void Streamer(TBuffer& b)
               void StreamerNVirtual(TBuffer& b)

Author: Richard Maunder 25/05/2005
Last update: root/gl:$Name: $:$Id: TGLCamera.cxx,v 1.13 2005/06/24 14:53:02 brun Exp $
Copyright (C) 1995-2000, Rene Brun and Fons Rademakers. *

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