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318 lines
9.1 KiB
318 lines
9.1 KiB
/*=========================================================================
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Program: Visualization Toolkit
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Module: $RCSfile: vtkThreshold.cxx,v $
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Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
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All rights reserved.
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See Copyright.txt or http://www.kitware.com/Copyright.htm for details.
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This software is distributed WITHOUT ANY WARRANTY; without even
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the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
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PURPOSE. See the above copyright notice for more information.
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=========================================================================*/
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#include "vtkThreshold.h"
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#include "vtkCell.h"
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#include "vtkCellData.h"
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#include "vtkIdList.h"
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#include "vtkInformation.h"
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#include "vtkInformationVector.h"
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#include "vtkObjectFactory.h"
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#include "vtkPointData.h"
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#include "vtkUnstructuredGrid.h"
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vtkCxxRevisionMacro(vtkThreshold, "$Revision: 1.68 $");
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vtkStandardNewMacro(vtkThreshold);
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// Construct with lower threshold=0, upper threshold=1, and threshold
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// function=upper AllScalars=1.
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vtkThreshold::vtkThreshold()
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{
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this->LowerThreshold = 0.0;
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this->UpperThreshold = 1.0;
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this->AllScalars = 1;
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this->AttributeMode = -1;
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this->ThresholdFunction = &vtkThreshold::Upper;
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this->ComponentMode = VTK_COMPONENT_MODE_USE_SELECTED;
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this->SelectedComponent = 0;
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// by default process active point scalars
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this->SetInputArrayToProcess(0,0,0,vtkDataObject::FIELD_ASSOCIATION_POINTS_THEN_CELLS,
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vtkDataSetAttributes::SCALARS);
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}
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vtkThreshold::~vtkThreshold()
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{
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}
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// Criterion is cells whose scalars are less or equal to lower threshold.
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void vtkThreshold::ThresholdByLower(double lower)
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{
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if ( this->LowerThreshold != lower ||
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this->ThresholdFunction != &vtkThreshold::Lower)
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{
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this->LowerThreshold = lower;
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this->ThresholdFunction = &vtkThreshold::Lower;
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this->Modified();
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}
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}
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// Criterion is cells whose scalars are greater or equal to upper threshold.
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void vtkThreshold::ThresholdByUpper(double upper)
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{
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if ( this->UpperThreshold != upper ||
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this->ThresholdFunction != &vtkThreshold::Upper)
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{
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this->UpperThreshold = upper;
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this->ThresholdFunction = &vtkThreshold::Upper;
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this->Modified();
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}
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}
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// Criterion is cells whose scalars are between lower and upper thresholds.
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void vtkThreshold::ThresholdBetween(double lower, double upper)
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{
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if ( this->LowerThreshold != lower || this->UpperThreshold != upper ||
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this->ThresholdFunction != &vtkThreshold::Between)
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{
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this->LowerThreshold = lower;
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this->UpperThreshold = upper;
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this->ThresholdFunction = &vtkThreshold::Between;
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this->Modified();
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}
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}
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int vtkThreshold::RequestData(
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vtkInformation *vtkNotUsed(request),
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vtkInformationVector **inputVector,
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vtkInformationVector *outputVector)
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{
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// get the info objects
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vtkInformation *inInfo = inputVector[0]->GetInformationObject(0);
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vtkInformation *outInfo = outputVector->GetInformationObject(0);
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// get the input and ouptut
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vtkDataSet *input = vtkDataSet::SafeDownCast(
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inInfo->Get(vtkDataObject::DATA_OBJECT()));
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vtkUnstructuredGrid *output = vtkUnstructuredGrid::SafeDownCast(
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outInfo->Get(vtkDataObject::DATA_OBJECT()));
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vtkIdType cellId, newCellId;
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vtkIdList *cellPts, *pointMap;
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vtkIdList *newCellPts;
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vtkCell *cell;
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vtkPoints *newPoints;
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int i, ptId, newId, numPts;
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int numCellPts;
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double x[3];
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vtkPointData *pd=input->GetPointData(), *outPD=output->GetPointData();
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vtkCellData *cd=input->GetCellData(), *outCD=output->GetCellData();
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int keepCell, usePointScalars;
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vtkDebugMacro(<< "Executing threshold filter");
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if (this->AttributeMode != -1)
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{
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vtkErrorMacro(<<"You have set the attribute mode on vtkThreshold. This method is deprecated, please use SetInputArrayToProcess instead.");
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return 1;
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}
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vtkDataArray *inScalars = this->GetInputArrayToProcess(0,inputVector);
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if (!inScalars)
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{
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vtkDebugMacro(<<"No scalar data to threshold");
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return 1;
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}
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outPD->CopyAllocate(pd);
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outCD->CopyAllocate(cd);
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numPts = input->GetNumberOfPoints();
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output->Allocate(input->GetNumberOfCells());
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newPoints = vtkPoints::New();
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newPoints->Allocate(numPts);
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pointMap = vtkIdList::New(); //maps old point ids into new
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pointMap->SetNumberOfIds(numPts);
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for (i=0; i < numPts; i++)
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{
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pointMap->SetId(i,-1);
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}
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newCellPts = vtkIdList::New();
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// are we using pointScalars?
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usePointScalars = (inScalars->GetNumberOfTuples() == numPts);
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// Check that the scalars of each cell satisfy the threshold criterion
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for (cellId=0; cellId < input->GetNumberOfCells(); cellId++)
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{
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cell = input->GetCell(cellId);
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cellPts = cell->GetPointIds();
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numCellPts = cell->GetNumberOfPoints();
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if ( usePointScalars )
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{
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if (this->AllScalars)
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{
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keepCell = 1;
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for ( i=0; keepCell && (i < numCellPts); i++)
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{
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ptId = cellPts->GetId(i);
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keepCell = this->EvaluateComponents( inScalars, ptId );
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}
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}
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else
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{
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keepCell = 0;
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for ( i=0; (!keepCell) && (i < numCellPts); i++)
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{
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ptId = cellPts->GetId(i);
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keepCell = this->EvaluateComponents( inScalars, ptId );
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}
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}
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}
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else //use cell scalars
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{
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keepCell = this->EvaluateComponents( inScalars, cellId );
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}
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if ( numCellPts > 0 && keepCell )
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{
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// satisfied thresholding (also non-empty cell, i.e. not VTK_EMPTY_CELL)
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for (i=0; i < numCellPts; i++)
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{
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ptId = cellPts->GetId(i);
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if ( (newId = pointMap->GetId(ptId)) < 0 )
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{
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input->GetPoint(ptId, x);
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newId = newPoints->InsertNextPoint(x);
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pointMap->SetId(ptId,newId);
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outPD->CopyData(pd,ptId,newId);
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}
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newCellPts->InsertId(i,newId);
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}
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newCellId = output->InsertNextCell(cell->GetCellType(),newCellPts);
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outCD->CopyData(cd,cellId,newCellId);
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newCellPts->Reset();
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} // satisfied thresholding
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} // for all cells
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vtkDebugMacro(<< "Extracted " << output->GetNumberOfCells()
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<< " number of cells.");
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// now clean up / update ourselves
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pointMap->Delete();
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newCellPts->Delete();
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output->SetPoints(newPoints);
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newPoints->Delete();
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output->Squeeze();
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return 1;
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}
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int vtkThreshold::EvaluateComponents( vtkDataArray *scalars, vtkIdType id )
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{
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int keepCell = 0;
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int numComp = scalars->GetNumberOfComponents();
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int c;
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switch ( this->ComponentMode )
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{
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case VTK_COMPONENT_MODE_USE_SELECTED:
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c = (this->SelectedComponent < numComp)?(this->SelectedComponent):(0);
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keepCell =
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(this->*(this->ThresholdFunction))(scalars->GetComponent(id,c));
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break;
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case VTK_COMPONENT_MODE_USE_ANY:
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keepCell = 0;
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for ( c = 0; (!keepCell) && (c < numComp); c++ )
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{
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keepCell =
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(this->*(this->ThresholdFunction))(scalars->GetComponent(id,c));
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}
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break;
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case VTK_COMPONENT_MODE_USE_ALL:
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keepCell = 1;
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for ( c = 0; keepCell && (c < numComp); c++ )
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{
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keepCell =
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(this->*(this->ThresholdFunction))(scalars->GetComponent(id,c));
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}
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break;
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}
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return keepCell;
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}
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// Return the method for manipulating scalar data as a string.
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const char *vtkThreshold::GetAttributeModeAsString(void)
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{
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if ( this->AttributeMode == VTK_ATTRIBUTE_MODE_DEFAULT )
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{
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return "Default";
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}
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else if ( this->AttributeMode == VTK_ATTRIBUTE_MODE_USE_POINT_DATA )
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{
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return "UsePointData";
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}
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else
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{
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return "UseCellData";
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}
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}
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// Return a string representation of the component mode
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const char *vtkThreshold::GetComponentModeAsString(void)
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{
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if ( this->ComponentMode == VTK_COMPONENT_MODE_USE_SELECTED )
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{
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return "UseSelected";
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}
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else if ( this->ComponentMode == VTK_COMPONENT_MODE_USE_ANY )
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{
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return "UseAny";
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}
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else
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{
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return "UseAll";
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}
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}
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int vtkThreshold::FillInputPortInformation(int, vtkInformation *info)
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{
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info->Set(vtkAlgorithm::INPUT_REQUIRED_DATA_TYPE(), "vtkDataSet");
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return 1;
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}
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void vtkThreshold::PrintSelf(ostream& os, vtkIndent indent)
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{
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this->Superclass::PrintSelf(os,indent);
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os << indent << "Attribute Mode: " << this->GetAttributeModeAsString() << endl;
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os << indent << "Component Mode: " << this->GetComponentModeAsString() << endl;
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os << indent << "Selected Component: " << this->SelectedComponent << endl;
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os << indent << "All Scalars: " << this->AllScalars << "\n";
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if ( this->ThresholdFunction == &vtkThreshold::Upper )
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{
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os << indent << "Threshold By Upper\n";
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}
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else if ( this->ThresholdFunction == &vtkThreshold::Lower )
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{
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os << indent << "Threshold By Lower\n";
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}
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else if ( this->ThresholdFunction == &vtkThreshold::Between )
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{
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os << indent << "Threshold Between\n";
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}
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os << indent << "Lower Threshold: " << this->LowerThreshold << "\n";
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os << indent << "Upper Threshold: " << this->UpperThreshold << "\n";
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}
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