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vtkTransform Class Reference

describes linear transformations via a 4x4 matrix. More...

#include <vtkTransform.h>

Inheritance diagram for vtkTransform:

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List of all members.

Public Methods

virtual const char * GetClassName ()
virtual int IsA (const char *type)
void PrintSelf (ostream &os, vtkIndent indent)
void Identity ()
void Inverse ()
void Translate (double x, double y, double z)
void Translate (const double x[3])
void Translate (const float x[3])
void RotateWXYZ (double angle, double x, double y, double z)
void RotateWXYZ (double angle, const double axis[3])
void RotateWXYZ (double angle, const float axis[3])
void RotateX (double angle)
void RotateY (double angle)
void RotateZ (double angle)
void Scale (double x, double y, double z)
void Scale (const double s[3])
void Scale (const float s[3])
void SetMatrix (vtkMatrix4x4 *matrix)
void SetMatrix (const double elements[16])
void Concatenate (vtkMatrix4x4 *matrix)
void Concatenate (const double elements[16])
void Concatenate (vtkLinearTransform *transform)
void PreMultiply ()
void PostMultiply ()
void GetOrientation (double orient[3])
void GetOrientation (float orient[3])
float * GetOrientation ()
void GetOrientationWXYZ (double wxyz[4])
void GetOrientationWXYZ (float wxyz[3])
float * GetOrientationWXYZ ()
void GetPosition (double pos[3])
void GetPosition (float pos[3])
float * GetPosition ()
void GetScale (double scale[3])
void GetScale (float scale[3])
float * GetScale ()
void GetInverse (vtkMatrix4x4 *inverse)
void GetTranspose (vtkMatrix4x4 *transpose)
void Push ()
void Pop ()
void SetInput (vtkLinearTransform *input)
vtkLinearTransformGetInput ()
int CircuitCheck (vtkAbstractTransform *transform)
vtkAbstractTransformGetInverse ()
vtkAbstractTransformMakeTransform ()
unsigned long GetMTime ()
void MultiplyPoint (const float in[4], float out[4])
void MultiplyPoint (const double in[4], double out[4])
void MultiplyPoints (vtkPoints *inPts, vtkPoints *outPts)
void MultiplyVectors (vtkVectors *inVectors, vtkVectors *outVectors)
void MultiplyNormals (vtkNormals *inNormals, vtkNormals *outNormals)
void Transpose ()
virtual void SetPoint (float, float, float, float)
virtual void SetPoint (float[4])
virtual void SetDoublePoint (double, double, double, double)
virtual void SetDoublePoint (double[4])
float * GetPoint ()
double * GetDoublePoint ()
void GetPoint (float p[4])
void Multiply4x4 (vtkMatrix4x4 *a, vtkMatrix4x4 *b, vtkMatrix4x4 *c)
void Multiply4x4 (const double a[16], const double b[16], double c[16])
void Multiply4x4 (vtkMatrix4x4 &a, vtkMatrix4x4 &b, vtkMatrix4x4 &c)
void Concatenate (vtkMatrix4x4 &matrix)
void SetMatrix (vtkMatrix4x4 &m)
void GetTranspose (vtkMatrix4x4 &transpose)
void GetInverse (vtkMatrix4x4 &inverse)
void GetOrientation (float *prx, float *pry, float *prz)
void GetOrientation (float &rx, float &ry, float &rz)
void GetPosition (float *px, float *py, float *pz)
void GetPosition (float &x, float &y, float &z)
void GetScale (float *psx, float *psy, float *psz)
void GetScale (float &x, float &y, float &z)

Static Public Methods

vtkTransform * New ()
int IsTypeOf (const char *type)
vtkTransform * SafeDownCast (vtkObject *o)

Protected Methods

 vtkTransform ()
 ~vtkTransform ()
 vtkTransform (const vtkTransform &t)
void operator= (const vtkTransform &)
void InternalDeepCopy (vtkAbstractTransform *t)
void InternalUpdate ()

Protected Attributes

vtkLinearTransformInput
vtkTransformConcatenation * Concatenation
vtkTransformConcatenationStack * Stack
unsigned long MatrixUpdateMTime
float Point [4]
double DoublePoint [4]
float ReturnValue [4]

Detailed Description

describes linear transformations via a 4x4 matrix.

Date:
2000/12/10 20:08:19
Revision:
1.73

A vtkTransform can be used to describe the full range of linear (also known as affine) coordinate transformations in three dimensions, which are internally represented as a 4x4 homogeneous transformation matrix. When you create a new vtkTransform, it is always initialized to the identity transformation.

The SetInput() method allows you to set another transform, instead of the identity transform, to be the base transformation. There is a pipeline mechanism to ensure that when the input is modified, the current transformation will be updated accordingly. This pipeline mechanism is also supported by the Concatenate() method.

Most of the methods for manipulating this transformation, e.g. Translate, Rotate, and Concatenate, can operate in either PreMultiply (the default) or PostMultiply mode. In PreMultiply mode, the translation, concatenation, etc. will occur before any transformations which are represented by the current matrix. In PostMultiply mode, the additional transformation will occur after any transformations represented by the current matrix.

This class performs all of its operations in a right handed coordinate system with right handed rotations. Some other graphics libraries use left handed coordinate systems and rotations.

See also:
vtkPerspectiveTransform vtkGeneralTransform vtkMatrix4x4 vtkTransformCollection vtkTransformFilter vtkTransformPolyDataFilter vtkImageReslice
Examples:
vtkTransform (examples)


Member Function Documentation

int vtkTransform::CircuitCheck vtkAbstractTransform   transform [virtual]
 

Check for self-reference. Will return true if concatenating with the specified transform, setting it to be our inverse, or setting it to be our input will create a circular reference. CircuitCheck is automatically called by SetInput(), SetInverse(), and Concatenate(vtkXTransform *). Avoid using this function, it is experimental.

Reimplemented from vtkAbstractTransform.

void vtkTransform::Concatenate vtkLinearTransform   transform
 

Concatenate the specified transform with the current transformation according to PreMultiply or PostMultiply semantics. The concatenation is pipelined, meaning that if any of the transformations are changed, even after Concatenate() is called, those changes will be reflected when you call TransformPoint().

void vtkTransform::Concatenate vtkMatrix4x4   matrix [inline]
 

Concatenates the matrix with the current transformation according to PreMultiply or PostMultiply semantics.

virtual const char* vtkTransform::GetClassName   [virtual]
 

Return the class name as a string. This method is defined in all subclasses of vtkObject with the vtkTypeMacro found in vtkSetGet.h.

Reimplemented from vtkLinearTransform.

vtkAbstractTransform* vtkTransform::GetInverse   [inline]
 

Get the inverse of this transform. If you modify this transform, the returned inverse transform will automatically update. If you want the inverse of a vtkTransform, you might want to use GetLinearInverse() instead which will type cast the result from vtkAbstractTransform to vtkLinearTransform.

Reimplemented from vtkAbstractTransform.

void vtkTransform::GetInverse vtkMatrix4x4   inverse
 

Return a matrix which is the inverse of the current transformation matrix.

unsigned long vtkTransform::GetMTime   [virtual]
 

Override GetMTime to account for input and concatenation.

Reimplemented from vtkAbstractTransform.

void vtkTransform::GetOrientation double    orient[3]
 

Get the x, y, z orientation angles from the transformation matrix as an array of three floating point values.

void vtkTransform::GetOrientationWXYZ double    wxyz[4]
 

Return the wxyz angle+axis representing the current orientation.

void vtkTransform::GetPosition double    pos[3]
 

Return the position from the current transformation matrix as an array of three floating point numbers. This is simply returning the translation component of the 4x4 matrix.

void vtkTransform::GetScale double    scale[3]
 

Return the scale factors of the current transformation matrix as an array of three float numbers. These scale factors are not necessarily about the x, y, and z axes unless unless the scale transformation was applied before any rotations.

void vtkTransform::GetTranspose vtkMatrix4x4   transpose
 

Return a matrix which is the transpose of the current transformation matrix. This is equivalent to the inverse if and only if the transformation is a pure rotation with no translation or scale.

void vtkTransform::Identity  
 

Set the transformation to the identity transformation. If the transform has an Input, then the transformation will be reset so that it is the same as the Input.

Reimplemented from vtkAbstractTransform.

void vtkTransform::InternalDeepCopy vtkAbstractTransform   t [protected, virtual]
 

Perform any subclass-specific DeepCopy.

Reimplemented from vtkHomogeneousTransform.

void vtkTransform::InternalUpdate   [protected, virtual]
 

Perform any subclass-specific Update.

Reimplemented from vtkAbstractTransform.

void vtkTransform::Inverse   [virtual]
 

Invert the transformation. This will also set a flag so that the transformation will use the inverse of its Input, if an Input has been set.

Implements vtkAbstractTransform.

virtual int vtkTransform::IsA const char *    type [virtual]
 

Return 1 if this class is the same type of (or a subclass of) the named class. Returns 0 otherwise. This method works in combination with vtkTypeMacro found in vtkSetGet.h.

Reimplemented from vtkLinearTransform.

int vtkTransform::IsTypeOf const char *    type [static]
 

Return 1 if this class type is the same type of (or a subclass of) the named class. Returns 0 otherwise. This method works in combination with vtkTypeMacro found in vtkSetGet.h.

Reimplemented from vtkLinearTransform.

vtkAbstractTransform* vtkTransform::MakeTransform   [virtual]
 

Make a new transform of the same type.

Implements vtkAbstractTransform.

void vtkTransform::Multiply4x4 vtkMatrix4x4   a,
vtkMatrix4x4   b,
vtkMatrix4x4   c
[inline]
 

For legacy compatibility. Do not use.

void vtkTransform::MultiplyPoint const float    in[4],
float    out[4]
[inline]
 

Use this method only if you wish to compute the transformation in homogeneous (x,y,z,w) coordinates, otherwise use TransformPoint(). This method calls this->GetMatrix()->MultiplyPoint().

void vtkTransform::MultiplyPoints vtkPoints   inPts,
vtkPoints   outPts
[inline]
 

These methods are obsolete. Use TransformPoints, TransformVectors, or TransformNormals instead.

vtkTransform* vtkTransform::New   [static]
 

Create an object with Debug turned off, modified time initialized to zero, and reference counting on.

Reimplemented from vtkObject.

void vtkTransform::Pop   [inline]
 

Deletes the transformation on the top of the stack and sets the top to the next transformation on the stack.

void vtkTransform::PostMultiply   [inline]
 

Sets the internal state of the transform to PostMultiply. All subsequent operations will occur after those already represented in the current transformation. In homogeneous matrix notation, M = A*M where M is the current transformation matrix and A is the applied matrix. The default is PreMultiply.

void vtkTransform::PreMultiply   [inline]
 

Sets the internal state of the transform to PreMultiply. All subsequent operations will occur before those already represented in the current transformation. In homogeneous matrix notation, M = M*A where M is the current transformation matrix and A is the applied matrix. The default is PreMultiply.

void vtkTransform::PrintSelf ostream &    os,
vtkIndent    indent
[virtual]
 

Methods invoked by print to print information about the object including superclasses. Typically not called by the user (use Print() instead) but used in the hierarchical print process to combine the output of several classes.

Reimplemented from vtkLinearTransform.

void vtkTransform::Push   [inline]
 

Pushes the current transformation onto the transformation stack.

void vtkTransform::RotateWXYZ double    angle,
double    x,
double    y,
double    z
[inline]
 

Create a rotation matrix and concatenate it with the current transformation according to PreMultiply or PostMultiply semantics. The angle is in degrees, and (x,y,z) specifies the axis that the rotation will be performed around.

void vtkTransform::RotateX double    angle [inline]
 

Create a rotation matrix about the X, Y, or Z axis and concatenate it with the current transformation according to PreMultiply or PostMultiply semantics. The angle is expressed in degrees.

vtkTransform* vtkTransform::SafeDownCast vtkObject   o [static]
 

Will cast the supplied object to vtkObject* is this is a safe operation (i.e., a safe downcast); otherwise NULL is returned. This method is defined in all subclasses of vtkObject with the vtkTypeMacro found in vtkSetGet.h.

Reimplemented from vtkLinearTransform.

void vtkTransform::Scale double    x,
double    y,
double    z
[inline]
 

Create a scale matrix (i.e. set the diagonal elements to x, y, z) and concatenate it with the current transformation according to PreMultiply or PostMultiply semantics.

void vtkTransform::SetInput vtkLinearTransform   input
 

Set the input for this transformation. This will be used as the base transformation if it is set. This method allows you to build a transform pipeline: if the input is modified, then this transformation will automatically update accordingly.

void vtkTransform::SetMatrix vtkMatrix4x4   matrix [inline]
 

Set the current matrix directly. This actually calls Identity(), followed by Concatenate(matrix).

virtual void vtkTransform::SetPoint float   ,
float   ,
float   ,
float   
[virtual]
 

Do not use these functions -- they are here only to provide compatibility with legacy code. Use TransformPoint() or GetMatrix()->MultiplyPoint() instead.

Returns the result of multiplying the currently set Point by the current transformation matrix. Point is expressed in homogeneous coordinates. The setting of the PreMultiplyFlag will determine if the Point is Pre or Post multiplied.

void vtkTransform::Translate double    x,
double    y,
double    z
[inline]
 

Create a translation matrix and concatenate it with the current transformation according to PreMultiply or PostMultiply semantics.

void vtkTransform::Transpose   [inline]
 

This method is deprecated because 1) it can turn a linear transformation matrix into a perspective transform matrix and 2) there is no way for the transformation pipeline to properly handle it. If the transformation is a pure rotation, then use GetInverse(), otherwise try to work around this method by using GetTranspose().


The documentation for this class was generated from the following file:
Generated on Tue Mar 19 13:33:56 2002 for VTK by doxygen1.2.14 written by Dimitri van Heesch, © 1997-2002