library: libRGL
#include "TGLUtil.h"

TGLMatrix

class description - header file - source file
viewCVS header - viewCVS source

class TGLMatrix

Inheritance Inherited Members Includes Libraries
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Function Members (Methods)

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public:
TGLMatrix()
TGLMatrix(const TGLVertex3& translation)
TGLMatrix(const Double_t* vals)
TGLMatrix(const TGLMatrix& other)
TGLMatrix(Double_t x, Double_t y, Double_t z)
TGLMatrix(const TGLVertex3& origin, const TGLVector3& zAxis, const TGLVector3* xAxis = 0)
virtual~TGLMatrix()
Double_t*Arr()
const Double_t*CArr() const
static TClass*Class()
voidDump() const
TGLVector3GetScale() const
TGLVertex3GetTranslation() const
virtual TClass*IsA() const
TGLMatrix&operator=(const TGLMatrix& rhs)
Double_t&operator[](Int_t index)
Double_toperator[](Int_t index) const
voidRotate(const TGLVertex3& pivot, const TGLVector3& axis, Double_t angle)
voidScale(const TGLVector3& scale)
voidSet(const Double_t* vals)
voidSet(const TGLVertex3& origin, const TGLVector3& zAxis, const TGLVector3* xAxis = 0)
voidSetIdentity()
voidSetTranslation(const TGLVertex3& translation)
voidSetTranslation(Double_t x, Double_t y, Double_t z)
virtual voidShowMembers(TMemberInspector& insp, char* parent)
virtual voidStreamer(TBuffer& b)
voidStreamerNVirtual(TBuffer& b)
voidTransformVertex(TGLVertex3& vertex) const
voidTranslate(const TGLVector3& vect)
voidTranspose3x3()
private:
Bool_tValidIndex(UInt_t index) const

Data Members

private:
Double_tfVals[16]Column MAJOR as per OGL

Class Description

                                                                      
 TGLVertex3                                                           
                                                                      
 3 component (x/y/z) vertex class                                     
                                                                      
 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.
TGLMatrix()
 Construct default identity matrix:

 1 0 0 0
 0 1 0 0
 0 0 1 0
 0 0 0 1
TGLMatrix(Double_t x, Double_t y, Double_t z)
 Construct matrix with translation components x,y,z:

 1 0 0 x
 0 1 0 y
 0 0 1 z
 0 0 0 1
TGLMatrix(const TGLVertex3 & translation)
 Construct matrix with translation components x,y,z:

 1 0 0 translation.X()
 0 1 0 translation.Y()
 0 0 1 translation.Z()
 0 0 0 1
TGLMatrix(const TGLVertex3 & origin, const TGLVector3 & zAxis, const TGLVector3 * xAxis)
 Construct matrix which when applied puts local origin at 
 'origin' and the local Z axis in direction 'z'. Both
 'origin' and 'zAxisVec' are expressed in the parent frame
TGLMatrix(const Double_t vals[16])
 Construct matrix using the 16 Double_t 'vals' passed, 
 ordering is maintained - i.e. should be column major 
 as we are
TGLMatrix(const TGLMatrix & other)
 Construct matrix from 'other'
~TGLMatrix()
 Destroy matirx object
void Set(const TGLVertex3 & origin, const TGLVector3 & zAxis, const TGLVector3 * xAxis)
 Set matrix which when applied puts local origin at 
 'origin' and the local Z axis in direction 'z'. Both
 'origin' and 'z' are expressed in the parent frame
void Set(const Double_t vals[16])
 Set matrix using the 16 Double_t 'vals' passed, 
 ordering is maintained - i.e. should be column major 
 as we are
void SetIdentity()
 Set matrix to identity:

 1 0 0 0
 0 1 0 0
 0 0 1 0
 0 0 0 1
void SetTranslation(Double_t x, Double_t y, Double_t z)
 Set matrix translation components x,y,z:

 . . . x
 . . . y
 . . . z
 . . . . 

 The other components are NOT modified
void SetTranslation(const TGLVertex3 & translation)
 Set matrix translation components x,y,z:

 . . . translation.X()
 . . . translation.Y()
 . . . translation.Z()
 . . . . 

 . = Exisiting component value - NOT modified
TGLVertex3 GetTranslation()
 Return the translation component of matrix

 . . . X()
 . . . Y()
 . . . Z()
 . . . .
void Translate(const TGLVector3 & vect)
 Offset (shift) matrix translation components by 'vect'

 . . . . + vect.X()
 . . . . + vect.Y()
 . . . . + vect.Z()
 . . . . 

 . = Exisiting component value - NOT modified
void Scale(const TGLVector3 & scale)
 Set matrix axis scales to 'scale'. Note - this really sets
 the overall (total) scaling for each axis - it does NOT
 apply compounded scale on top of existing one
void Rotate(const TGLVertex3 & pivot, const TGLVector3 & axis, Double_t angle)
 Update martix so resulting transform has been rotated about 'pivot'
 (in parent frame), round vector 'axis', through 'angle' (radians)
 Equivalent to glRotate function, but with addition of translation
 and compounded on top of existing.
void TransformVertex(TGLVertex3 & vertex)
 Transform passed 'vertex' by this matrix - converts local frame to parent
void Transpose3x3()
 Transpose the top left 3x3 matrix component along major diagonal
 Supported as currently incompatability between TGeo and GL matrix
 layouts for this 3x3 only. To be resolved.
TGLVector3 GetScale()
 Get local axis scaling factors
void Dump()
 Output 16 matrix components to std::cout

 0  4   8  12
 1  5   9  13
 2  6  10  14
 3  7  11  15
Bool_t ValidIndex(UInt_t index)
 Fields
{ return (index < 3); }
const Double_t * CArr()
{ return fVals; }
Double_t * Arr()
{ return fVals; }
TGLUtil& operator=(const TGLUtil& glu)

Author: Richard Maunder 25/05/2005
Last update: root/gl:$Name: $:$Id: TGLUtil.cxx,v 1.33 2006/12/13 09:33:29 brun Exp $
Copyright (C) 1995-2000, Rene Brun and Fons Rademakers. *

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