TGLPlane Class Reference

3D plane class - of format Ax + By + Cz + D = 0

This is part of collection of simple utility classes for GL only in TGLUtil.h/cxx. These provide const and non-const accessors Arr() & CArr() to a GL compatible internal field - so can be used directly with OpenGL C API calls - which TVector3 etc cannot (easily). They are not intended to be fully featured just provide minimum required.

Definition at line 529 of file TGLUtil.h.

Public Member Functions
	TGLPlane ()
	Construct a default plane of x + y + z = 0. More...
	TGLPlane (const TGLPlane &other)
	Construct plane from 'other'. More...
	TGLPlane (Double_t a, Double_t b, Double_t c, Double_t d)
	Construct plane with equation a.x + b.y + c.z + d = 0 with optional normalisation. More...
	TGLPlane (Double_t eq[4])
	Construct plane with equation eq[0].x + eq[1].y + eq[2].z + eq[3] = 0 with optional normalisation. More...
	TGLPlane (const TGLVector3 &norm, const TGLVertex3 &point)
	Construct plane with supplied normal vector, passing through point with optional normalisation. More...
	TGLPlane (const TGLVertex3 &p1, const TGLVertex3 &p2, const TGLVertex3 &p3)
	Construct plane passing through 3 supplied points with optional normalisation. More...
virtual	~TGLPlane ()
	Destroy plane object. More...
void	Set (const TGLPlane &other)
	Assign from other. More...
void	Set (Double_t a, Double_t b, Double_t c, Double_t d)
	Set by values. More...
void	Set (Double_t eq[4])
	Set by array values. More...
void	Set (const TGLVector3 &norm, const TGLVertex3 &point)
	Set plane from a normal vector and in-plane point pair. More...
void	Set (const TGLVertex3 &p1, const TGLVertex3 &p2, const TGLVertex3 &p3)
	Set plane by three points. More...
void	Negate ()
	Negate the plane. More...
Double_t	A () const
Double_t	B () const
Double_t	C () const
Double_t	D () const
TGLVector3	Norm () const
Double_t	DistanceTo (const TGLVertex3 &vertex) const
	Distance from plane to vertex. More...
TGLVertex3	NearestOn (const TGLVertex3 &point) const
	Return nearest point on plane. More...
const Double_t *	CArr () const
Double_t *	Arr ()
void	Dump () const
	Output plane equation to std::out. More...
	ClassDef (TGLPlane, 0)

Private Member Functions
void	Normalise ()
	Normalise the plane. More...

Private Attributes
Double_t	fVals [4]

#include <TGLUtil.h>

Constructor & Destructor Documentation

TGLPlane::TGLPlane

(

)

Construct a default plane of x + y + z = 0.

Definition at line 366 of file TGLUtil.cxx.

TGLPlane::TGLPlane

(

const TGLPlane &

other

)

Construct plane from 'other'.

Definition at line 374 of file TGLUtil.cxx.

TGLPlane::TGLPlane	(	Double_t	a,
		Double_t	b,
		Double_t	c,
		Double_t	d
	)

Construct plane with equation a.x + b.y + c.z + d = 0 with optional normalisation.

Definition at line 383 of file TGLUtil.cxx.

TGLPlane::TGLPlane

(

Double_t

eq[4]

)

Construct plane with equation eq[0].x + eq[1].y + eq[2].z + eq[3] = 0 with optional normalisation.

Definition at line 392 of file TGLUtil.cxx.

TGLPlane::TGLPlane	(	const TGLVector3 &	norm,
		const TGLVertex3 &	point
	)

Construct plane with supplied normal vector, passing through point with optional normalisation.

Definition at line 411 of file TGLUtil.cxx.

TGLPlane::TGLPlane	(	const TGLVertex3 &	p1,
		const TGLVertex3 &	p2,
		const TGLVertex3 &	p3
	)

Construct plane passing through 3 supplied points with optional normalisation.

Definition at line 401 of file TGLUtil.cxx.

TGLPlane::~TGLPlane ( )

virtual

Destroy plane object.

Definition at line 419 of file TGLUtil.cxx.

Member Function Documentation

Double_t TGLPlane::A ( ) const

inline

Definition at line 556 of file TGLUtil.h.

Referenced by Intersection().

Double_t* TGLPlane::Arr ( )

inline

Definition at line 567 of file TGLUtil.h.

Double_t TGLPlane::B ( ) const

inline

Definition at line 557 of file TGLUtil.h.

Referenced by Intersection().

Double_t TGLPlane::C ( ) const

inline

Definition at line 558 of file TGLUtil.h.

Referenced by Intersection().

const Double_t* TGLPlane::CArr ( ) const

inline

Definition at line 566 of file TGLUtil.h.

Referenced by TGLScene::RenderAllPasses().

TGLPlane::ClassDef	(	TGLPlane	,
		0
	)

Double_t TGLPlane::D ( ) const

inline

Definition at line 559 of file TGLUtil.h.

Referenced by TEveProjectionAxesGL::DirectDraw(), TEveCaloLegoGL::DrawAxis2D(), TEveCaloLegoGL::GetGridStep(), Intersection(), TEveLegoEventHandler::Rotate(), and TGLCameraOverlay::SetFrustum().

Double_t TGLPlane::DistanceTo

(

const TGLVertex3 &

vertex

)

const

Distance from plane to vertex.

Definition at line 520 of file TGLUtil.cxx.

Referenced by TGLPerspectiveCamera::Apply(), TGLBoundingBox::Overlap(), and TGLLightSet::StdSetupLights().

void TGLPlane::Dump

(

)

const

Output plane equation to std::out.

Definition at line 444 of file TGLUtil.cxx.

TGLVertex3 TGLPlane::NearestOn

(

const TGLVertex3 &

point

)

const

Return nearest point on plane.

Definition at line 528 of file TGLUtil.cxx.

Referenced by TGLRotateManip::Draw(), TGLCamera::Frustum(), and TGLClipPlane::Set().

void TGLPlane::Negate

(

)

Negate the plane.

Definition at line 509 of file TGLUtil.cxx.

Referenced by TGLClipPlane::PlaneSet(), and TGLScene::RenderAllPasses().

TGLVector3 TGLPlane::Norm ( ) const

inline

Definition at line 561 of file TGLUtil.h.

Referenced by TGLRotateManip::CalculateAngleDelta(), TGLRotateManip::Draw(), TGLCamera::EyeDirection(), TGLRotateManip::HandleButton(), TGLRotateManip::HandleMotion(), Intersection(), TGLClipPlane::Set(), and TGLClipPlane::Setup().

void TGLPlane::Normalise ( )

private

Normalise the plane.

Definition at line 426 of file TGLUtil.cxx.

void TGLPlane::Set

(

const TGLPlane &

other

)

Assign from other.

Definition at line 453 of file TGLUtil.cxx.

Referenced by TGLRotateManip::HandleButton(), TGLCamera::TGLCamera(), and TGLCamera::UpdateCache().

void TGLPlane::Set	(	Double_t	a,
		Double_t	b,
		Double_t	c,
		Double_t	d
	)

Set by values.

Definition at line 464 of file TGLUtil.cxx.

void TGLPlane::Set

(

Double_t

eq[4]

)

Set by array values.

Definition at line 476 of file TGLUtil.cxx.

void TGLPlane::Set	(	const TGLVector3 &	norm,
		const TGLVertex3 &	point
	)

Set plane from a normal vector and in-plane point pair.

Definition at line 488 of file TGLUtil.cxx.

void TGLPlane::Set	(	const TGLVertex3 &	p1,
		const TGLVertex3 &	p2,
		const TGLVertex3 &	p3
	)

Set plane by three points.

Definition at line 500 of file TGLUtil.cxx.

Member Data Documentation

Double_t TGLPlane::fVals[4]

private

Definition at line 533 of file TGLUtil.h.

Referenced by A(), Arr(), B(), C(), CArr(), D(), Norm(), and Set().

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The documentation for this class was generated from the following files:

• graf3d/gl/inc/TGLUtil.h
• graf3d/gl/src/TGLUtil.cxx