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vtkDirectionEncoder Class Reference

encode a direction into a one or two byte value. More...

#include <vtkDirectionEncoder.h>

Inheritance diagram for vtkDirectionEncoder:

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Collaboration diagram for vtkDirectionEncoder:

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List of all members.

Public Methods

virtual const char * GetClassName ()
virtual int IsA (const char *type)
virtual int GetEncodedDirection (float n[3])=0
virtual float * GetDecodedGradient (int value)=0
virtual int GetNumberOfEncodedDirections (void)=0
virtual float * GetDecodedGradientTable (void)=0

Static Public Methods

int IsTypeOf (const char *type)
vtkDirectionEncoder * SafeDownCast (vtkObject *o)

Protected Methods

 vtkDirectionEncoder ()
 ~vtkDirectionEncoder ()
 vtkDirectionEncoder (const vtkDirectionEncoder &)
void operator= (const vtkDirectionEncoder &)

Detailed Description

encode a direction into a one or two byte value.

Date:
2000/12/10 20:08:36
Revision:
1.11

Given a direction, encode it into an integer value. This value should be less than 65536, which is the maximum number of encoded directions supported by this superclass. A direction encoded is used to encode normals in a volume for use during volume rendering, and the amount of space that is allocated per normal is 2 bytes. This is an abstract superclass - see the subclasses for specific implementation details.

See also:
vtkRecursiveSphereDirectionEncoder


Member Function Documentation

virtual const char* vtkDirectionEncoder::GetClassName   [virtual]
 

Get the name of this class

Reimplemented from vtkObject.

Reimplemented in vtkRecursiveSphereDirectionEncoder.

virtual float* vtkDirectionEncoder::GetDecodedGradient int    value [pure virtual]
 

/ Given an encoded value, return a pointer to the normal vector

Implemented in vtkRecursiveSphereDirectionEncoder.

virtual float* vtkDirectionEncoder::GetDecodedGradientTable void    [pure virtual]
 

Get the decoded gradient table. There are this->GetNumberOfEncodedDirections() entries in the table, each containing a normal (direction) vector. This is a flat structure - 3 times the number of directions floats in an array.

Implemented in vtkRecursiveSphereDirectionEncoder.

virtual int vtkDirectionEncoder::GetEncodedDirection float    n[3] [pure virtual]
 

Given a normal vector n, return the encoded direction

Implemented in vtkRecursiveSphereDirectionEncoder.

virtual int vtkDirectionEncoder::GetNumberOfEncodedDirections void    [pure virtual]
 

Return the number of encoded directions

Implemented in vtkRecursiveSphereDirectionEncoder.

virtual int vtkDirectionEncoder::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 vtkObject.

Reimplemented in vtkRecursiveSphereDirectionEncoder.

int vtkDirectionEncoder::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 vtkObject.

Reimplemented in vtkRecursiveSphereDirectionEncoder.

vtkDirectionEncoder* vtkDirectionEncoder::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 vtkObject.

Reimplemented in vtkRecursiveSphereDirectionEncoder.


The documentation for this class was generated from the following file:
Generated on Tue Mar 19 13:24:59 2002 for VTK by doxygen1.2.14 written by Dimitri van Heesch, © 1997-2002