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vtkDecimatePolylineFilter.h
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vtkDecimatePolylineFilter.h
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/*=========================================================================
Program: Visualization Toolkit
Module: vtkDecimatePolylineFilter.h
Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
All rights reserved.
See Copyright.txt or http://www.kitware.com/Copyright.htm for details.
This software is distributed WITHOUT ANY WARRANTY; without even
the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
PURPOSE. See the above copyright notice for more information.
=========================================================================*/
/**
* @class vtkDecimatePolylineFilter
* @brief 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. For example, if a vertex is multiply connected,
* meaning that it is used by multiple distinct polylines, then the extra
* topological constraints are ignored. This can produce less than optimal
* results.
*
* @sa
* vtkDecimate vtkDecimateProp vtkQuadricClustering vtkQuadricDecimation
*/
#ifndef vtkDecimatePolylineFilter_h
#define vtkDecimatePolylineFilter_h
#include "vtkFiltersCoreModule.h" // For export macro
#include "vtkSmartPointer.h" // Needed for SP ivars
#include "vtkPolyDataAlgorithm.h"
class vtkPriorityQueue;
class VTKFILTERSCORE_EXPORT vtkDecimatePolylineFilter : public vtkPolyDataAlgorithm
{
public:
//@{
/**
* Standard methods for type information and printing.
*/
vtkTypeMacro(vtkDecimatePolylineFilter,vtkPolyDataAlgorithm);
void PrintSelf(ostream& os, vtkIndent indent) VTK_OVERRIDE;
//@}
/**
* Instantiate this object with a target reduction of 0.90.
*/
static vtkDecimatePolylineFilter *New();
//@{
/**
* 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).
*/
vtkSetClampMacro(TargetReduction,double,0.0,1.0);
vtkGetMacro(TargetReduction,double);
//@}
//@{
/**
* Set/get the desired precision for the output types. See the documentation
* for the vtkAlgorithm::DesiredOutputPrecision enum for an explanation of
* the available precision settings.
*/
vtkSetMacro(OutputPointsPrecision,int);
vtkGetMacro(OutputPointsPrecision,int);
//@}
protected:
vtkDecimatePolylineFilter();
~vtkDecimatePolylineFilter() VTK_OVERRIDE;
int RequestData(vtkInformation *, vtkInformationVector **, vtkInformationVector *) VTK_OVERRIDE;
class Polyline;
double ComputeError( vtkPolyData* input,
Polyline* polyline,
vtkIdType id );
vtkSmartPointer< vtkPriorityQueue > PriorityQueue;
double TargetReduction;
int OutputPointsPrecision;
private:
vtkDecimatePolylineFilter(const vtkDecimatePolylineFilter&) VTK_DELETE_FUNCTION;
void operator=(const vtkDecimatePolylineFilter&) VTK_DELETE_FUNCTION;
};
#endif