Perspective projection camera - with characteristic foreshortening.

Definition at line 25 of file TGLPerspectiveCamera.h.

Public Member Functions
	TGLPerspectiveCamera ()
	Construct default XOZ perspective camera. More...

	TGLPerspectiveCamera (const TGLVector3 &hAxis, const TGLVector3 &vAxis)
	Construct perspective camera. More...

virtual	~TGLPerspectiveCamera ()
	Destroy perspective camera. More...

virtual void	Apply (const TGLBoundingBox &box, const TGLRect *pickRect=0) const
	Apply the camera to the current GL context, setting the viewport, projection and modelview matrices. More...

virtual void	Configure (Double_t fov, Double_t dolly, Double_t center[3], Double_t hRotate, Double_t vRotate)
	Configure the camera state. More...

Double_t	GetFOV () const

virtual Bool_t	IsPerspective () const

virtual void	Reset ()
	Reset the camera to defaults - reframe the world volume established in Setup() in default state. More...

void	SetFOV (Double_t fov)

virtual void	Setup (const TGLBoundingBox &box, Bool_t reset=kTRUE)
	Setup camera limits suitable to view the world volume defined by 'box' and call Reset() to initialise camera. More...

virtual Bool_t	Truck (Int_t xDelta, Int_t yDelta, Bool_t mod1, Bool_t mod2)
	Truck the camera - 'move camera parallel to film plane'. More...

virtual Bool_t	Zoom (Int_t delta, Bool_t mod1, Bool_t mod2)
	Zoom the camera - 'adjust lens focal length, retaining camera position'. More...

Public Member Functions inherited from TGLCamera
	TGLCamera ()
	Default base camera constructor. More...

	TGLCamera (const TGLVector3 &hAxis, const TGLVector3 &vAxis)
	Default base camera constructor. More...

virtual	~TGLCamera ()
	Base camera destructor. More...

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
	Adjust a passed REFERENCE value 'val', based on screenShift delta. More...

Double_t	AdjustDelta (Double_t screenShift, Double_t deltaFactor, Bool_t mod1, Bool_t mod2) const
	Adjust a passed screen value and apply modifiers. More...

virtual Bool_t	Dolly (Int_t delta, Bool_t mod1, Bool_t mod2)
	Dolly the camera - 'move camera along eye line, retaining lens focal length'. More...

void	DrawDebugAids () const
	Draw out some debugging aids for the camera: More...

TGLVector3	EyeDirection () const
	Extract the camera eye direction (vector), running from EyePoint() Camera must have valid frustum cache - call Apply() after last modification, before using. More...

TGLVertex3	EyePoint () const
	Return the camera eye point (vertex) in world space Camera must have valid frustum cache - call Apply() after last modification, before using. More...

TGLVertex3	FrustumCenter () const
	Find the center of the camera frustum from intersection of planes This method will work even with parallel left/right & top/bottom and infinite eye point of ortho cameras Camera must have valid frustum cache - call Apply() after last modification, before using. More...

Rgl::EOverlap	FrustumOverlap (const TGLBoundingBox &box) const
	Calculate overlap (kInside, kOutside, kPartial) of box with camera frustum Camera must have valid frustum cache - call Apply() after last modification, before using. More...

const TGLPlane &	FrustumPlane (EFrustumPlane plane) const

const TGLMatrix &	GetCamBase () const

const TGLMatrix &	GetCamTrans () const

Double_t *	GetCenterVec ()

Bool_t	GetExternalCenter ()

Double_t	GetFarClip () const

Double_t *	GetFixDefCenterVec ()

Double_t	GetNearClip () const

Double_t	GetTheta () const
	Get angle between camera up axis. More...

Float_t	GetVAxisMinAngle ()

void	IncTimeStamp ()

Bool_t	IsCacheDirty () const

virtual Bool_t	IsOrthographic () const

Bool_t	OfInterest (const TGLBoundingBox &box, Bool_t ignoreSize) const
	Calculate if the an object defined by world frame bounding box is 'of interest' to the camera. More...

TGLMatrix &	RefCamBase ()

TGLMatrix &	RefCamTrans ()

TGLMatrix &	RefLastNoPickProjM () const

const TGLMatrix &	RefModelViewMatrix () const

TGLRect &	RefViewport ()

const TGLRect &	RefViewport () const

void	ResetInterest ()
	Clear out the existing interest box. More...

virtual Bool_t	Rotate (Int_t xDelta, Int_t yDelta, Bool_t mod1, Bool_t mod2)
	Rotate the camera round view volume center established in Setup(). More...

virtual Bool_t	RotateArcBall (Int_t xDelta, Int_t yDelta, Bool_t mod1, Bool_t mod2)
	Rotate the camera round view volume center established in Setup(). More...

virtual Bool_t	RotateArcBallRad (Double_t hRotate, Double_t vRotate)
	Rotate camera around center. More...

virtual Bool_t	RotateRad (Double_t hRotate, Double_t vRotate)
	Rotate camera around center. More...

void	SetCenterVec (Double_t x, Double_t y, Double_t z)
	Set camera center vector. More...

void	SetCenterVecWarp (Double_t x, Double_t y, Double_t z)
	Set camera center vector and do not keep the same combined camera transformation matrix. More...

void	SetExternalCenter (Bool_t x)
	Set camera center diffrent than scene center, if enable is kTRUE. More...

void	SetFixDefCenter (Bool_t x)

void	SetFixDefCenterVec (Double_t x, Double_t y, Double_t z)

void	SetVAxisMinAngle (Float_t x)

void	SetViewport (const TGLRect &viewport)
	Set viewport extents from passed 'viewport' rect. More...

UInt_t	TimeStamp () const

virtual Bool_t	Truck (Double_t xDelta, Double_t yDelta)
	Truck the camera - 'move camera parallel to film plane'. More...

Bool_t	UpdateInterest (Bool_t force)
	Update the internal interest box (fInterestBox) of the camera. More...

TGLVector3	ViewportDeltaToWorld (const TGLVertex3 &worldRef, Double_t viewportXDelta, Double_t viewportYDelta, TGLMatrix *modviewMat=0) const
	Apply a 2D viewport delta (shift) to the projection of worldRef onto viewport, returning the resultant world vector which equates to it. More...

Rgl::EOverlap	ViewportOverlap (const TGLBoundingBox &box) const
	Calculate overlap (kInside, kOutside, kPartial) of box projection onto viewport (as rect) against the viewport rect. More...

std::pair< Bool_t, TGLVertex3 >	ViewportPlaneIntersection (Double_t viewportX, Double_t viewportY, const TGLPlane &worldPlane) const
	Find the intersection of projection of supplied viewport point (a 3D world line - see ViewportToWorld) with supplied world plane. More...

std::pair< Bool_t, TGLVertex3 >	ViewportPlaneIntersection (const TPoint &viewport, const TGLPlane &worldPlane) const
	Find the intersection of projection of supplied viewport TPoint (a 3D world line - see ViewportToWorld) with supplied world plane. More...

TGLRect	ViewportRect (const TGLBoundingBox &box, TGLBoundingBox::EFace face) const
	Calculate viewport rectangle which just contains projection of single 'face' of world frame bounding box 'box' onto the viewport. More...

TGLRect	ViewportRect (const TGLBoundingBox &box, const TGLBoundingBox::EFace *face=0) const
	Calculate viewport rectangle which just contains projection of world frame bounding box 'box' onto the viewport. More...

TGLVertex3	ViewportToWorld (const TGLVertex3 &viewportVertex, TGLMatrix *modviewMat=0) const
	Convert a '3D' viewport vertex to 3D world one. More...

TGLLine3	ViewportToWorld (Double_t viewportX, Double_t viewportY) const
	Convert a 2D viewport position to 3D world line - the projection of the viewport point into 3D space. More...

TGLLine3	ViewportToWorld (const TPoint &viewport) const
	Convert a 2D viewport position to 3D world line - the projection of the viewport point into 3D space. More...

void	WindowToViewport (Int_t &, Int_t &y) const

void	WindowToViewport (TPoint &point) const

void	WindowToViewport (TGLRect &rect) const

void	WindowToViewport (TGLVertex3 &vertex) const

TGLVector3	WorldDeltaToViewport (const TGLVertex3 &worldRef, const TGLVector3 &worldDelta) const
	Convert a 3D vector worldDelta (shift) about vertex worldRef to a viewport (screen) '3D' vector. More...

TGLVertex3	WorldToViewport (const TGLVertex3 &worldVertex, TGLMatrix *modviewMat=0) const
	Convert a 3D world vertex to '3D' viewport (screen) one. More...

Public Member Functions inherited from TObject
	TObject ()
	TObject constructor. More...

	TObject (const TObject &object)
	TObject copy ctor. More...

virtual	~TObject ()
	TObject destructor. More...

void	AbstractMethod (const char *method) const
	Use this method to implement an "abstract" method that you don't want to leave purely abstract. More...

virtual void	AppendPad (Option_t *option="")
	Append graphics object to current pad. More...

virtual void	Browse (TBrowser *b)
	Browse object. May be overridden for another default action. More...

ULong_t	CheckedHash ()
	Checked and record whether for this class has a consistent Hash/RecursiveRemove setup (*) and then return the regular Hash value for this object. More...

virtual const char *	ClassName () const
	Returns name of class to which the object belongs. More...

virtual void	Clear (Option_t *="")

virtual TObject *	Clone (const char *newname="") const
	Make a clone of an object using the Streamer facility. More...

virtual Int_t	Compare (const TObject *obj) const
	Compare abstract method. More...

virtual void	Copy (TObject &object) const
	Copy this to obj. More...

virtual void	Delete (Option_t *option="")
	Delete this object. More...

virtual Int_t	DistancetoPrimitive (Int_t px, Int_t py)
	Computes distance from point (px,py) to the object. More...

virtual void	Draw (Option_t *option="")
	Default Draw method for all objects. More...

virtual void	DrawClass () const
	Draw class inheritance tree of the class to which this object belongs. More...

virtual TObject *	DrawClone (Option_t *option="") const
	Draw a clone of this object in the current selected pad for instance with: `gROOT->SetSelectedPad(gPad)`. More...

virtual void	Dump () const
	Dump contents of object on stdout. More...

virtual void	Error (const char method, const char msgfmt,...) const
	Issue error message. More...

virtual void	Execute (const char method, const char params, Int_t *error=0)
	Execute method on this object with the given parameter string, e.g. More...

virtual void	Execute (TMethod method, TObjArray params, Int_t *error=0)
	Execute method on this object with parameters stored in the TObjArray. More...

virtual void	ExecuteEvent (Int_t event, Int_t px, Int_t py)
	Execute action corresponding to an event at (px,py). More...

virtual void	Fatal (const char method, const char msgfmt,...) const
	Issue fatal error message. More...

virtual TObject *	FindObject (const char *name) const
	Must be redefined in derived classes. More...

virtual TObject *	FindObject (const TObject *obj) const
	Must be redefined in derived classes. More...

virtual Option_t *	GetDrawOption () const
	Get option used by the graphics system to draw this object. More...

virtual const char *	GetIconName () const
	Returns mime type name of object. More...

virtual const char *	GetName () const
	Returns name of object. More...

virtual char *	GetObjectInfo (Int_t px, Int_t py) const
	Returns string containing info about the object at position (px,py). More...

virtual Option_t *	GetOption () const

virtual const char *	GetTitle () const
	Returns title of object. More...

virtual UInt_t	GetUniqueID () const
	Return the unique object id. More...

virtual Bool_t	HandleTimer (TTimer *timer)
	Execute action in response of a timer timing out. More...

virtual ULong_t	Hash () const
	Return hash value for this object. More...

Bool_t	HasInconsistentHash () const
	Return true is the type of this object is known to have an inconsistent setup for Hash and RecursiveRemove (i.e. More...

virtual void	Info (const char method, const char msgfmt,...) const
	Issue info message. More...

virtual Bool_t	InheritsFrom (const char *classname) const
	Returns kTRUE if object inherits from class "classname". More...

virtual Bool_t	InheritsFrom (const TClass *cl) const
	Returns kTRUE if object inherits from TClass cl. More...

virtual void	Inspect () const
	Dump contents of this object in a graphics canvas. More...

void	InvertBit (UInt_t f)

virtual Bool_t	IsEqual (const TObject *obj) const
	Default equal comparison (objects are equal if they have the same address in memory). More...

virtual Bool_t	IsFolder () const
	Returns kTRUE in case object contains browsable objects (like containers or lists of other objects). More...

R__ALWAYS_INLINE Bool_t	IsOnHeap () const

virtual Bool_t	IsSortable () const

R__ALWAYS_INLINE Bool_t	IsZombie () const

virtual void	ls (Option_t *option="") const
	The ls function lists the contents of a class on stdout. More...

void	MayNotUse (const char *method) const
	Use this method to signal that a method (defined in a base class) may not be called in a derived class (in principle against good design since a child class should not provide less functionality than its parent, however, sometimes it is necessary). More...

virtual Bool_t	Notify ()
	This method must be overridden to handle object notification. More...

void	Obsolete (const char method, const char asOfVers, const char *removedFromVers) const
	Use this method to declare a method obsolete. More...

void	operator delete (void *ptr)
	Operator delete. More...

void	operator delete[] (void *ptr)
	Operator delete []. More...

void *	operator new (size_t sz)

void *	operator new (size_t sz, void *vp)

void *	operator new[] (size_t sz)

void *	operator new[] (size_t sz, void *vp)

TObject &	operator= (const TObject &rhs)
	TObject assignment operator. More...

virtual void	Paint (Option_t *option="")
	This method must be overridden if a class wants to paint itself. More...

virtual void	Pop ()
	Pop on object drawn in a pad to the top of the display list. More...

virtual void	Print (Option_t *option="") const
	This method must be overridden when a class wants to print itself. More...

virtual Int_t	Read (const char *name)
	Read contents of object with specified name from the current directory. More...

virtual void	RecursiveRemove (TObject *obj)
	Recursively remove this object from a list. More...

void	ResetBit (UInt_t f)

virtual void	SaveAs (const char filename="", Option_t option="") const
	Save this object in the file specified by filename. More...

virtual void	SavePrimitive (std::ostream &out, Option_t *option="")
	Save a primitive as a C++ statement(s) on output stream "out". More...

void	SetBit (UInt_t f, Bool_t set)
	Set or unset the user status bits as specified in f. More...

void	SetBit (UInt_t f)

virtual void	SetDrawOption (Option_t *option="")
	Set drawing option for object. More...

virtual void	SetUniqueID (UInt_t uid)
	Set the unique object id. More...

virtual void	SysError (const char method, const char msgfmt,...) const
	Issue system error message. More...

R__ALWAYS_INLINE Bool_t	TestBit (UInt_t f) const

Int_t	TestBits (UInt_t f) const

virtual void	UseCurrentStyle ()
	Set current style settings in this object This function is called when either TCanvas::UseCurrentStyle or TROOT::ForceStyle have been invoked. More...

virtual void	Warning (const char method, const char msgfmt,...) const
	Issue warning message. More...

virtual Int_t	Write (const char *name=0, Int_t option=0, Int_t bufsize=0)
	Write this object to the current directory. More...

virtual Int_t	Write (const char *name=0, Int_t option=0, Int_t bufsize=0) const
	Write this object to the current directory. More...

Private Attributes
Double_t	fFOV

Static Private Attributes
static Double_t	fgFOVDefault = 30

static UInt_t	fgFOVDeltaSens = 500

static Double_t	fgFOVMax = 120.0

static Double_t	fgFOVMin = 0.01

Additional Inherited Members
Public Types inherited from TGLCamera
enum	EFrustumPlane { kNear = 0, kLeft = 1, kRight = 2, kTop = 3, kBottom = 4, kFar = 5, kPlanesPerFrustum = 6 }

Public Types inherited from TObject
enum	{ kIsOnHeap = 0x01000000, kNotDeleted = 0x02000000, kZombie = 0x04000000, kInconsistent = 0x08000000, kBitMask = 0x00ffffff }

enum	{ kSingleKey = BIT(0), kOverwrite = BIT(1), kWriteDelete = BIT(2) }

enum	EDeprecatedStatusBits { kObjInCanvas = BIT(3) }

enum	EStatusBits { kCanDelete = BIT(0), kMustCleanup = BIT(3), kIsReferenced = BIT(4), kHasUUID = BIT(5), kCannotPick = BIT(6), kNoContextMenu = BIT(8), kInvalidObject = BIT(13) }

Static Public Member Functions inherited from TObject
static Long_t	GetDtorOnly ()
	Return destructor only flag. More...

static Bool_t	GetObjectStat ()
	Get status of object stat flag. More...

static void	SetDtorOnly (void *obj)
	Set destructor only flag. More...

static void	SetObjectStat (Bool_t stat)
	Turn on/off tracking of objects in the TObjectTable. More...

Protected Member Functions inherited from TGLCamera
void	UpdateCache () const
	largest box diagonal seen in OfInterest() - used when bootstrapping interest box More...

Protected Member Functions inherited from TObject
virtual void	DoError (int level, const char location, const char fmt, va_list va) const
	Interface to ErrorHandler (protected). More...

void	MakeZombie ()

Protected Attributes inherited from TGLCamera
Bool_t	fCacheDirty

TGLMatrix	fCamBase

TGLMatrix	fCamTrans

TGLVector3 *	fCenter

TGLMatrix	fClipM
	modelView matrix (cached) More...

TGLVector3	fDefCenter

Double_t	fDollyDefault
	last applied far-clip More...

Double_t	fDollyDistance

TGLVector3	fExtCenter

Bool_t	fExternalCenter

Double_t	fFarClip
	last applied near-clip More...

TGLVector3	fFDCenter

Bool_t	fFixDefCenter

TGLPlane	fFrustumPlanes [kPlanesPerFrustum]
	object space clip matrix (cached) More...

TGLBoundingBox	fInterestBox
	viewport (GL coords - origin bottom left) More...

Double_t	fLargestSeen
	the interest box - created in UpdateInterest() More...

TGLMatrix	fLastNoPickProjM
	timestamp More...

TGLMatrix	fModVM
	projection matrix (cached) More...

Double_t	fNearClip
	current camera center More...

TGLMatrix	fProjM
	no-pick projection matrix (cached) More...

UInt_t	fTimeStamp
	cached items dirty? More...

Float_t	fVAxisMinAngle

TGLRect	fViewport
	frustum planes (cached) More...

Bool_t	fWasArcBalled

Static Protected Attributes inherited from TGLCamera
static UInt_t	fgDollyDeltaSens = 500

#include <TGLPerspectiveCamera.h>

Inheritance diagram for TGLPerspectiveCamera:

[legend]

Constructor & Destructor Documentation

◆ TGLPerspectiveCamera() [1/2]

TGLPerspectiveCamera::TGLPerspectiveCamera ( )

Construct default XOZ perspective camera.

Definition at line 34 of file TGLPerspectiveCamera.cxx.

◆ TGLPerspectiveCamera() [2/2]

TGLPerspectiveCamera::TGLPerspectiveCamera	(	const TGLVector3 &	hAxis,
		const TGLVector3 &	vAxis
	)

Construct perspective camera.

Definition at line 45 of file TGLPerspectiveCamera.cxx.

◆ ~TGLPerspectiveCamera()

TGLPerspectiveCamera::~TGLPerspectiveCamera ( )

virtual

Destroy perspective camera.

Definition at line 56 of file TGLPerspectiveCamera.cxx.

Member Function Documentation

◆ Apply()

void TGLPerspectiveCamera::Apply	(	const TGLBoundingBox &	sceneBox,
		const TGLRect *	pickRect = `0`
	)		const

virtual

Apply the camera to the current GL context, setting the viewport, projection and modelview matrices.

After this vertices etc can be directly entered in the world frame. This also updates the cached frustum values, enabling all the projection, overlap tests etc defined in TGLCamera to be used.

Arguments are:

'box' - view volume box - used to adjust near/far clipping
'pickRect' - optional picking rect. If non-null, restrict drawing to this viewport rect.

Implements TGLCamera.

Definition at line 158 of file TGLPerspectiveCamera.cxx.

◆ Configure()

void TGLPerspectiveCamera::Configure	(	Double_t	fov,
		Double_t	dolly,
		Double_t	center[3],
		Double_t	hRotate,
		Double_t	vRotate
	)

virtual

Configure the camera state.

fov - set directly field-of-view in degrees (default = 30);
dolly - additional move along the camera forward direction;
center - new camera center (can be 0 for no change);
hRotate - additional "up/down" rotation in radians;
vRotate - additional "left/right" rotation in radians.

Implements TGLCamera.

Definition at line 272 of file TGLPerspectiveCamera.cxx.

◆ GetFOV()

Double_t TGLPerspectiveCamera::GetFOV ( ) const

inline

Definition at line 41 of file TGLPerspectiveCamera.h.

◆ IsPerspective()

virtual Bool_t TGLPerspectiveCamera::IsPerspective ( ) const

inlinevirtual

Reimplemented from TGLCamera.

Definition at line 39 of file TGLPerspectiveCamera.h.

◆ Reset()

void TGLPerspectiveCamera::Reset ( void )

virtual

Reset the camera to defaults - reframe the world volume established in Setup() in default state.

Note: limits defined in Setup() are not adjusted.

Implements TGLCamera.

Definition at line 99 of file TGLPerspectiveCamera.cxx.

◆ SetFOV()

void TGLPerspectiveCamera::SetFOV ( Double_t fov )

inline

Definition at line 42 of file TGLPerspectiveCamera.h.

◆ Setup()

void TGLPerspectiveCamera::Setup	(	const TGLBoundingBox &	box,
		Bool_t	reset = `kTRUE`
	)

virtual

Setup camera limits suitable to view the world volume defined by 'box' and call Reset() to initialise camera.

Implements TGLCamera.

Definition at line 64 of file TGLPerspectiveCamera.cxx.

◆ Truck()

Bool_t TGLPerspectiveCamera::Truck	(	Int_t	xDelta,
		Int_t	yDelta,
		Bool_t	mod1,
		Bool_t	mod2
	)

virtual

Truck the camera - 'move camera parallel to film plane'.

Returns kTRUE is redraw required (camera change), kFALSE otherwise.

Implements TGLCamera.

Definition at line 134 of file TGLPerspectiveCamera.cxx.

◆ Zoom()

Bool_t TGLPerspectiveCamera::Zoom	(	Int_t	delta,
		Bool_t	mod1,
		Bool_t	mod2
	)

virtual

Zoom the camera - 'adjust lens focal length, retaining camera position'.

Arguments are:

'delta' - mouse viewport delta (pixels) - +ive zoom in, -ive zoom out
'mod1' / 'mod2' - sensitivity modifiers - see TGLCamera::AdjustAndClampVal()

Returns kTRUE is redraw required (camera change), kFALSE otherwise.

Implements TGLCamera.

Definition at line 118 of file TGLPerspectiveCamera.cxx.

Member Data Documentation

◆ fFOV

Double_t TGLPerspectiveCamera::fFOV

private

Definition at line 29 of file TGLPerspectiveCamera.h.

◆ fgFOVDefault

Double_t TGLPerspectiveCamera::fgFOVDefault = 30

staticprivate

Definition at line 31 of file TGLPerspectiveCamera.h.

◆ fgFOVDeltaSens

UInt_t TGLPerspectiveCamera::fgFOVDeltaSens = 500

staticprivate

Definition at line 32 of file TGLPerspectiveCamera.h.

◆ fgFOVMax

Double_t TGLPerspectiveCamera::fgFOVMax = 120.0

staticprivate

Definition at line 31 of file TGLPerspectiveCamera.h.

◆ fgFOVMin

Double_t TGLPerspectiveCamera::fgFOVMin = 0.01

staticprivate

Definition at line 31 of file TGLPerspectiveCamera.h.

Libraries for TGLPerspectiveCamera:

[legend]

Public Member Functions

Private Attributes

Static Private Attributes

Additional Inherited Members

Constructor & Destructor Documentation

◆ TGLPerspectiveCamera() [1/2]

◆ TGLPerspectiveCamera() [2/2]

◆ ~TGLPerspectiveCamera()

Member Function Documentation

◆ Apply()

◆ Configure()

◆ GetFOV()

◆ IsPerspective()

◆ Reset()

◆ SetFOV()

◆ Setup()

◆ Truck()

◆ Zoom()

Member Data Documentation

◆ fFOV

◆ fgFOVDefault

◆ fgFOVDeltaSens

◆ fgFOVMax

◆ fgFOVMin