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:

      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& sceneBox, const TGLRect* pickRect = 0)
       static TClass* Class()
       virtual Bool_t Dolly(Int_t delta, Bool_t mod1, Bool_t mod2)
                 void DrawDebugAids() const
           TGLVector3 EyeDirection() const
           TGLVertex3 EyePoint() 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]       !
             TGLBoundingBox fPreviousInterestBox    ! previous interest box (DEBUG)
             TGLBoundingBox fInterestFrustum        ! frustum basis of current interest box - NOT a true BB! (DEBUG)
             TGLBoundingBox fInterestFrustumAsBox   ! frustum basis (as box) of current interest box (DEBUG)
      static const Double_t fgInterestBoxExpansion  ! expansion c.f. aligned current frustum box

    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()
            Double_t fLargestInterest  ! largest box diagonal - used when bootstrapping interest box

    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

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

TGLVertex3 EyePoint() const

 Extract the camera eye point using the current frustum planes

TGLVector3 EyeDirection() const

 Extract the camera eye direction using the current frustum planes

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

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& sceneBox, 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 1.16 2005/08/30 10:29:52 brun Exp $
Copyright (C) 1995-2000, Rene Brun and Fons Rademakers. *

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