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vtkDecimatePolylineFilter.cxx
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vtkDecimatePolylineFilter.cxx
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/*=========================================================================
Program: Visualization Toolkit
Module: vtkDecimatePolylineFilter.cxx
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.
=========================================================================*/
#include "vtkDecimatePolylineFilter.h"
#include "vtkDoubleArray.h"
#include "vtkLine.h"
#include "vtkMath.h"
#include "vtkInformation.h"
#include "vtkInformationVector.h"
#include "vtkObjectFactory.h"
#include "vtkLine.h"
#include "vtkPolyData.h"
#include "vtkPoints.h"
#include "vtkCellArray.h"
#include "vtkPointData.h"
#include "vtkCellData.h"
#include "vtkPriorityQueue.h"
#include <vector>
#include <queue>
#include <map>
struct vtkDecimatePolylineFilter::vtkDecimatePolylineVertexErrorSTLMap
{
std::map< int, double > VertexErrorMap;
};
vtkStandardNewMacro(vtkDecimatePolylineFilter);
//---------------------------------------------------------------------
// Create object with specified reduction of 90%.
vtkDecimatePolylineFilter::vtkDecimatePolylineFilter()
{
this->TargetReduction = 0.90;
this->Closed = true;
this->PriorityQueue = vtkSmartPointer< vtkPriorityQueue >::New();
this->ErrorMap = new vtkDecimatePolylineVertexErrorSTLMap;
this->OutputPointsPrecision = vtkAlgorithm::DEFAULT_PRECISION;
}
//---------------------------------------------------------------------
vtkDecimatePolylineFilter::~vtkDecimatePolylineFilter()
{
delete this->ErrorMap;
}
//---------------------------------------------------------------------
double
vtkDecimatePolylineFilter::ComputeError( vtkPolyData* input,
int prev, int id, int next )
{
vtkPoints * inputPoints = input->GetPoints();
double x1[3], x[3], x2[3];
inputPoints->GetPoint( prev, x1 );
inputPoints->GetPoint( id, x );
inputPoints->GetPoint( next, x2 );
if ( vtkMath::Distance2BetweenPoints( x1, x2 ) == 0.0 )
{
return 0.0;
}
else
{
return vtkLine::DistanceToLine( x, x1, x2 );
}
}
//---------------------------------------------------------------------
// Reduce the number of points in a set of polylines
//
int vtkDecimatePolylineFilter::RequestData(
vtkInformation *vtkNotUsed(request),
vtkInformationVector **inputVector,
vtkInformationVector *outputVector)
{
// get the info objects
vtkInformation *inInfo = inputVector[0]->GetInformationObject(0);
vtkInformation *outInfo = outputVector->GetInformationObject(0);
// get the input and output
vtkPolyData *input = vtkPolyData::SafeDownCast(
inInfo->Get(vtkDataObject::DATA_OBJECT()));
vtkPolyData *output = vtkPolyData::SafeDownCast(
outInfo->Get(vtkDataObject::DATA_OBJECT()));
vtkCellArray *inputLines = input->GetLines();
vtkPoints * inputPoints = input->GetPoints();
vtkDebugMacro("Decimating polylines");
if (!inputLines || !inputPoints)
{
return 1;
}
vtkIdType numLines = inputLines->GetNumberOfCells();
vtkIdType numPts = inputPoints->GetNumberOfPoints();
if ( numLines < 1 || numPts < 1 )
{
return 1;
}
// Allocate memory and prepare for data processing
vtkPoints *newPts = vtkPoints::New();
// Set the desired precision for the points in the output.
if(this->OutputPointsPrecision == vtkAlgorithm::DEFAULT_PRECISION)
{
newPts->SetDataType(inputPoints->GetDataType());
}
else if(this->OutputPointsPrecision == vtkAlgorithm::SINGLE_PRECISION)
{
newPts->SetDataType(VTK_FLOAT);
}
else if(this->OutputPointsPrecision == vtkAlgorithm::DOUBLE_PRECISION)
{
newPts->SetDataType(VTK_DOUBLE);
}
vtkCellArray *newLines = vtkCellArray::New();
newLines->Allocate(numLines,2);
vtkPointData *inPD = input->GetPointData();
vtkPointData *outPD = output->GetPointData();
vtkCellData *inCD = input->GetCellData();
vtkCellData *outCD = output->GetCellData();
outPD->CopyAllocate(inPD);
outCD->CopyAllocate(inCD);
// Loop over all polylines, decimating each independently
vtkIdType i, cellId = 0, newId;
double error;
for ( i = 0; i < numPts; ++i )
{
this->ErrorMap->VertexErrorMap[i] = 0.;
}
for ( i = 0; i < numPts; ++i )
{
error = ComputeError( input, GetPrev(i), i, GetNext(i) );
this->ErrorMap->VertexErrorMap[i] = error;
this->PriorityQueue->Insert( error, i );
}//for all points in polyline
// Now process structures,
// deleting points until the decimation target is met.
vtkIdType currentNumPts = this->PriorityQueue->GetNumberOfItems();
while ( 1.0 - ( static_cast<double>( currentNumPts ) / static_cast<double>(
numPts ) )
< this->TargetReduction &&
currentNumPts > 2 )
{
i = this->PriorityQueue->Pop( );
--currentNumPts;
UpdateError( input, i );
this->ErrorMap->VertexErrorMap.erase( i );
}
// What's left over is now spit out as a new polyline
newId = newLines->InsertNextCell( currentNumPts + 1);
outCD->CopyData( inCD, cellId, newId );
std::map< int, double >::iterator it = this->ErrorMap->VertexErrorMap.begin();
while( it != this->ErrorMap->VertexErrorMap.end() )
{
newId = newPts->InsertNextPoint( inputPoints->GetPoint( it->first ) );
newLines->InsertCellPoint( newId );
outPD->CopyData( inPD, it->first, newId );
++it;
}
if( this->Closed )
{
newId = newPts->InsertNextPoint( newPts->GetPoint( 0 ) );
newLines->InsertCellPoint( 0 );
outPD->CopyData( inPD, this->ErrorMap->VertexErrorMap.begin()->first, newId );
}
// Clean up in preparation for the next line
this->PriorityQueue->Reset();
// Create output and clean up
output->SetPoints( newPts );
output->SetLines( newLines );
newLines->Delete();
newPts->Delete();
return 1;
}
//---------------------------------------------------------------------
int vtkDecimatePolylineFilter::GetPrev( int iId )
{
std::map< int, double >::iterator it = this->ErrorMap->VertexErrorMap.find( iId );
if( it == this->ErrorMap->VertexErrorMap.begin() )
{
if( this->Closed )
{
it = this->ErrorMap->VertexErrorMap.end();
--it;
return it->first;
}
else
{
return iId;
}
}
else
{
--it;
return it->first;
}
}
//---------------------------------------------------------------------
int vtkDecimatePolylineFilter::GetNext( int iId )
{
std::map< int, double >::iterator
it = this->ErrorMap->VertexErrorMap.find( iId );
std::map< int, double >::iterator
end_it = this->ErrorMap->VertexErrorMap.end();
--end_it;
if( it == end_it )
{
if( this->Closed )
{
return this->ErrorMap->VertexErrorMap.begin()->first;
}
else
{
return iId;
}
}
else
{
++it;
return it->first;
}
}
//---------------------------------------------------------------------
void vtkDecimatePolylineFilter::UpdateError( vtkPolyData* input, int iId )
{
int prev = GetPrev( iId );
int prev_prev = GetPrev( prev );
int next = GetNext( iId );
int next_next = GetNext( next );
double prev_error = ComputeError( input, prev_prev, prev, next );
this->ErrorMap->VertexErrorMap[prev] = prev_error;
this->PriorityQueue->DeleteId( prev );
this->PriorityQueue->Insert( prev_error, prev );
double next_error = ComputeError( input, prev, next, next_next );
this->ErrorMap->VertexErrorMap[next] = next_error;
this->PriorityQueue->DeleteId( next );
this->PriorityQueue->Insert( next_error, next );
}
//---------------------------------------------------------------------
//---------------------------------------------------------------------
void vtkDecimatePolylineFilter::PrintSelf(ostream& os, vtkIndent indent)
{
this->Superclass::PrintSelf(os,indent);
os << indent << "Target Reduction: " << this->TargetReduction << "\n";
os << indent << "Output Points Precision: " << this->OutputPointsPrecision
<< "\n";
}