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vtkConnectivityFilter.h
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vtkConnectivityFilter.h
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/*=========================================================================
Program: Visualization Toolkit
Module: vtkConnectivityFilter.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 vtkConnectivityFilter
* @brief extract data based on geometric connectivity
*
* vtkConnectivityFilter is a filter that extracts cells that share common
* points and/or meet other connectivity criterion. (Cells that share
* vertices and meet other connectivity criterion such as scalar range are
* known as a region.) The filter works in one of six ways: 1) extract the
* largest connected region in the dataset; 2) extract specified region
* numbers; 3) extract all regions sharing specified point ids; 4) extract
* all regions sharing specified cell ids; 5) extract the region closest to
* the specified point; or 6) extract all regions (used to color the data by
* region).
*
* vtkConnectivityFilter is generalized to handle any type of input dataset.
* It generates output data of type vtkUnstructuredGrid. If you know that
* your input type is vtkPolyData, you may wish to use
* vtkPolyDataConnectivityFilter.
*
* The behavior of vtkConnectivityFilter can be modified by turning on the
* boolean ivar ScalarConnectivity. If this flag is on, the connectivity
* algorithm is modified so that cells are considered connected only if 1)
* they are geometrically connected (share a point) and 2) the scalar values
* of one of the cell's points falls in the scalar range specified. This use
* of ScalarConnectivity is particularly useful for volume datasets: it can
* be used as a simple "connected segmentation" algorithm. For example, by
* using a seed voxel (i.e., cell) on a known anatomical structure,
* connectivity will pull out all voxels "containing" the anatomical
* structure. These voxels can then be contoured or processed by other
* visualization filters.
*
* @sa
* vtkPolyDataConnectivityFilter
*/
#ifndef vtkConnectivityFilter_h
#define vtkConnectivityFilter_h
#include "vtkFiltersCoreModule.h" // For export macro
#include "vtkUnstructuredGridAlgorithm.h"
#define VTK_EXTRACT_POINT_SEEDED_REGIONS 1
#define VTK_EXTRACT_CELL_SEEDED_REGIONS 2
#define VTK_EXTRACT_SPECIFIED_REGIONS 3
#define VTK_EXTRACT_LARGEST_REGION 4
#define VTK_EXTRACT_ALL_REGIONS 5
#define VTK_EXTRACT_CLOSEST_POINT_REGION 6
class vtkDataArray;
class vtkFloatArray;
class vtkIdList;
class vtkIdTypeArray;
class vtkIntArray;
class VTKFILTERSCORE_EXPORT vtkConnectivityFilter : public vtkUnstructuredGridAlgorithm
{
public:
vtkTypeMacro(vtkConnectivityFilter,vtkUnstructuredGridAlgorithm);
void PrintSelf(ostream& os, vtkIndent indent) VTK_OVERRIDE;
/**
* Construct with default extraction mode to extract largest regions.
*/
static vtkConnectivityFilter *New();
//@{
/**
* Turn on/off connectivity based on scalar value. If on, cells are connected
* only if they share points AND one of the cells scalar values falls in the
* scalar range specified.
*/
vtkSetMacro(ScalarConnectivity,int);
vtkGetMacro(ScalarConnectivity,int);
vtkBooleanMacro(ScalarConnectivity,int);
//@}
//@{
/**
* Set the scalar range to use to extract cells based on scalar connectivity.
*/
vtkSetVector2Macro(ScalarRange,double);
vtkGetVector2Macro(ScalarRange,double);
//@}
//@{
/**
* Control the extraction of connected surfaces.
*/
vtkSetClampMacro(ExtractionMode,int,
VTK_EXTRACT_POINT_SEEDED_REGIONS,VTK_EXTRACT_CLOSEST_POINT_REGION);
vtkGetMacro(ExtractionMode,int);
void SetExtractionModeToPointSeededRegions()
{this->SetExtractionMode(VTK_EXTRACT_POINT_SEEDED_REGIONS);};
void SetExtractionModeToCellSeededRegions()
{this->SetExtractionMode(VTK_EXTRACT_CELL_SEEDED_REGIONS);};
void SetExtractionModeToLargestRegion()
{this->SetExtractionMode(VTK_EXTRACT_LARGEST_REGION);};
void SetExtractionModeToSpecifiedRegions()
{this->SetExtractionMode(VTK_EXTRACT_SPECIFIED_REGIONS);};
void SetExtractionModeToClosestPointRegion()
{this->SetExtractionMode(VTK_EXTRACT_CLOSEST_POINT_REGION);};
void SetExtractionModeToAllRegions()
{this->SetExtractionMode(VTK_EXTRACT_ALL_REGIONS);};
const char *GetExtractionModeAsString();
//@}
/**
* Initialize list of point ids/cell ids used to seed regions.
*/
void InitializeSeedList();
/**
* Add a seed id (point or cell id). Note: ids are 0-offset.
*/
void AddSeed(vtkIdType id);
/**
* Delete a seed id (point or cell id). Note: ids are 0-offset.
*/
void DeleteSeed(vtkIdType id);
/**
* Initialize list of region ids to extract.
*/
void InitializeSpecifiedRegionList();
/**
* Add a region id to extract. Note: ids are 0-offset.
*/
void AddSpecifiedRegion(int id);
/**
* Delete a region id to extract. Note: ids are 0-offset.
*/
void DeleteSpecifiedRegion(int id);
//@{
/**
* Use to specify x-y-z point coordinates when extracting the region
* closest to a specified point.
*/
vtkSetVector3Macro(ClosestPoint,double);
vtkGetVectorMacro(ClosestPoint,double,3);
//@}
/**
* Obtain the number of connected regions.
*/
int GetNumberOfExtractedRegions();
//@{
/**
* Turn on/off the coloring of connected regions.
*/
vtkSetMacro(ColorRegions,int);
vtkGetMacro(ColorRegions,int);
vtkBooleanMacro(ColorRegions,int);
//@}
//@{
/**
* 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:
vtkConnectivityFilter();
~vtkConnectivityFilter() VTK_OVERRIDE;
// Usual data generation method
int RequestData(vtkInformation *, vtkInformationVector **, vtkInformationVector *) VTK_OVERRIDE;
int FillInputPortInformation(int port, vtkInformation *info) VTK_OVERRIDE;
int ColorRegions; //boolean turns on/off scalar gen for separate regions
int ExtractionMode; //how to extract regions
int OutputPointsPrecision;
vtkIdList *Seeds; //id's of points or cells used to seed regions
vtkIdList *SpecifiedRegionIds; //regions specified for extraction
vtkIdTypeArray *RegionSizes; //size (in cells) of each region extracted
double ClosestPoint[3];
int ScalarConnectivity;
double ScalarRange[2];
void TraverseAndMark(vtkDataSet *input);
private:
// used to support algorithm execution
vtkFloatArray *CellScalars;
vtkIdList *NeighborCellPointIds;
vtkIdType *Visited;
vtkIdType *PointMap;
vtkIdTypeArray *NewScalars;
vtkIdTypeArray *NewCellScalars;
vtkIdType RegionNumber;
vtkIdType PointNumber;
vtkIdType NumCellsInRegion;
vtkDataArray *InScalars;
vtkIdList *Wave;
vtkIdList *Wave2;
vtkIdList *PointIds;
vtkIdList *CellIds;
private:
vtkConnectivityFilter(const vtkConnectivityFilter&) VTK_DELETE_FUNCTION;
void operator=(const vtkConnectivityFilter&) VTK_DELETE_FUNCTION;
};
//@{
/**
* Return the method of extraction as a string.
*/
inline const char *vtkConnectivityFilter::GetExtractionModeAsString(void)
{
if ( this->ExtractionMode == VTK_EXTRACT_POINT_SEEDED_REGIONS )
{
return "ExtractPointSeededRegions";
}
else if ( this->ExtractionMode == VTK_EXTRACT_CELL_SEEDED_REGIONS )
{
return "ExtractCellSeededRegions";
}
else if ( this->ExtractionMode == VTK_EXTRACT_SPECIFIED_REGIONS )
{
return "ExtractSpecifiedRegions";
}
else if ( this->ExtractionMode == VTK_EXTRACT_ALL_REGIONS )
{
return "ExtractAllRegions";
}
else if ( this->ExtractionMode == VTK_EXTRACT_CLOSEST_POINT_REGION )
{
return "ExtractClosestPointRegion";
}
else
{
return "ExtractLargestRegion";
}
}
//@}
#endif