vtkDecimatePolylineFilter Class Reference

#include <vtkDecimatePolylineFilter.h>

Inheritance diagram for vtkDecimatePolylineFilter:

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Collaboration diagram for vtkDecimatePolylineFilter:

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List of all members.

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Detailed Description

reduce the number of lines in a polyline

vtkDecimatePolylineFilter is a filter to reduce the number of lines in a polyline. The algorithm functions by evaluating an error metric for each vertex (i.e., the distance of the vertex to a line defined from the two vertices on either side of the vertex). Then, these vertices are placed into a priority queue, and those with larger errors are deleted first. The decimation continues until the target reduction is reached.

Warning:

This algorithm is a very simple implementation that overlooks some potential complexities. First, if a vertex is multiply connected, meaning that it is used by multiple polylines, then the extra topological constraints are ignored. Second, the error is not updated as vertices are deleted (similar to iteratively computing a quadric error metric). Thus, once calculated, the error is used to determine which vertices are removed. This can produce less than optimal results.

See also:

vtkDecimate vtkDecimateProp vtkQuadricClustering vtkQuadricDecimation

Definition at line 45 of file vtkDecimatePolylineFilter.h.

typedef vtkPolyDataAlgorithm	Superclass
virtual const char *	GetClassName ()
virtual int	IsA (const char *type)
void	PrintSelf (ostream &os, vtkIndent indent)
static int	IsTypeOf (const char *type)
static vtkDecimatePolylineFilter *	SafeDownCast (vtkObject *o)
Public Member Functions
virtual void	SetTargetReduction (double)
virtual double	GetTargetReduction ()
Static Public Member Functions
static vtkDecimatePolylineFilter *	New ()
Protected Member Functions
	vtkDecimatePolylineFilter ()
	~vtkDecimatePolylineFilter ()
int	RequestData (vtkInformation *, vtkInformationVector **, vtkInformationVector *)
Protected Attributes
double	TargetReduction

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Member Typedef Documentation

typedef vtkPolyDataAlgorithm vtkDecimatePolylineFilter::Superclass

Standard methods for type information and printing.

Reimplemented from vtkPolyDataAlgorithm.

Definition at line 50 of file vtkDecimatePolylineFilter.h.

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Constructor & Destructor Documentation

vtkDecimatePolylineFilter::vtkDecimatePolylineFilter

(

)

[protected]

vtkDecimatePolylineFilter::~vtkDecimatePolylineFilter

(

)

[protected]

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Member Function Documentation

virtual const char* vtkDecimatePolylineFilter::GetClassName

(

)

[virtual]

Standard methods for type information and printing.

Reimplemented from vtkPolyDataAlgorithm.

static int vtkDecimatePolylineFilter::IsTypeOf

(

const char *

type

)

[static]

Standard methods for type information and printing.

Reimplemented from vtkPolyDataAlgorithm.

virtual int vtkDecimatePolylineFilter::IsA

(

const char *

type

)

[virtual]

Standard methods for type information and printing.

Reimplemented from vtkPolyDataAlgorithm.

static vtkDecimatePolylineFilter* vtkDecimatePolylineFilter::SafeDownCast

(

vtkObject *

o

)

[static]

Standard methods for type information and printing.

Reimplemented from vtkPolyDataAlgorithm.

void vtkDecimatePolylineFilter::PrintSelf	(	ostream &	os,
		vtkIndent	indent
	)			[virtual]

Standard methods for type information and printing.

Reimplemented from vtkPolyDataAlgorithm.

static vtkDecimatePolylineFilter* vtkDecimatePolylineFilter::New

(

)

[static]

Instantiate this object with a target reduction of 0.90.

Reimplemented from vtkPolyDataAlgorithm.

virtual void vtkDecimatePolylineFilter::SetTargetReduction

(

double

)

[virtual]

Specify the desired reduction in the total number of polygons (e.g., if TargetReduction is set to 0.9, this filter will try to reduce the data set to 10% of its original size).

virtual double vtkDecimatePolylineFilter::GetTargetReduction

(

)

[virtual]

Specify the desired reduction in the total number of polygons (e.g., if TargetReduction is set to 0.9, this filter will try to reduce the data set to 10% of its original size).

int vtkDecimatePolylineFilter::RequestData	(	vtkInformation *	request,
		vtkInformationVector **	inputVector,
		vtkInformationVector *	outputVector
	)			[protected, virtual]

This is called by the superclass. This is the method you should override.

Reimplemented from vtkPolyDataAlgorithm.

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Member Data Documentation

double vtkDecimatePolylineFilter::TargetReduction [protected]

Definition at line 71 of file vtkDecimatePolylineFilter.h.

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

• dox/Graphics/vtkDecimatePolylineFilter.h