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/*=========================================================================
Program: Visualization Toolkit
Module: $RCSfile: vtkMaskPoints.cxx,v $
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 "vtkMaskPoints.h"
#include "vtkCellArray.h"
#include "vtkDataSet.h"
#include "vtkMath.h"
#include "vtkObjectFactory.h"
#include "vtkPointData.h"
#include "vtkPoints.h"
#include "vtkPolyData.h"
vtkCxxRevisionMacro(vtkMaskPoints, "$Revision: 1.45 $");
vtkStandardNewMacro(vtkMaskPoints);
//----------------------------------------------------------------------------
vtkMaskPoints::vtkMaskPoints()
{
this->OnRatio = 2;
this->Offset = 0;
this->RandomMode = 0;
this->MaximumNumberOfPoints = VTK_LARGE_ID;
this->GenerateVertices = 0;
}
//----------------------------------------------------------------------------
void vtkMaskPoints::Execute()
{
vtkPoints *newPts;
vtkPointData *pd;
vtkIdType numNewPts;
double x[3];
vtkIdType ptId, id;
vtkPolyData *output = this->GetOutput();
vtkPointData *outputPD = output->GetPointData();
vtkDataSet *input= this->GetInput();
vtkIdType numPts=input->GetNumberOfPoints();
// Check input
//
vtkDebugMacro(<<"Masking points");
if ( numPts < 1 )
{
return;
}
pd = input->GetPointData();
id = 0;
// Allocate space
//
numNewPts = numPts / this->OnRatio;
if (numNewPts > this->MaximumNumberOfPoints)
{
numNewPts = this->MaximumNumberOfPoints;
}
newPts = vtkPoints::New();
newPts->Allocate(numNewPts);
outputPD->CopyAllocate(pd);
// Traverse points and copy
//
int abort=0;
vtkIdType progressInterval=numPts/20 +1;
if ( this->RandomMode ) // retro mode
{
double cap;
if (((double)numPts/this->OnRatio) > this->MaximumNumberOfPoints)
{
cap = 2.0*numPts/this->MaximumNumberOfPoints - 1;
}
else
{
cap = 2.0*this->OnRatio - 1;
}
for (ptId = this->Offset;
(ptId < numPts) && (id < this->MaximumNumberOfPoints) && !abort;
ptId += (1 + (int)((double)vtkMath::Random()*cap)) )
{
input->GetPoint(ptId, x);
id = newPts->InsertNextPoint(x);
outputPD->CopyData(pd,ptId,id);
if ( ! (id % progressInterval) ) //abort/progress
{
this->UpdateProgress (0.5*id/numPts);
abort = this->GetAbortExecute();
}
}
}
else // a.r. mode
{
for ( ptId = this->Offset;
(ptId < numPts) && (id < (this->MaximumNumberOfPoints-1)) && !abort;
ptId += this->OnRatio )
{
input->GetPoint(ptId, x);
id = newPts->InsertNextPoint(x);
outputPD->CopyData(pd,ptId,id);
if ( ! (id % progressInterval) ) //abort/progress
{
this->UpdateProgress (0.5*id/numPts);
abort = this->GetAbortExecute();
}
}
}
// Generate vertices if requested
//
if ( this->GenerateVertices )
{
vtkCellArray *verts = vtkCellArray::New();
verts->Allocate(verts->EstimateSize(1,id+1));
verts->InsertNextCell(id+1);
for ( ptId=0; ptId<(id+1) && !abort; ptId++)
{
if ( ! (ptId % progressInterval) ) //abort/progress
{
this->UpdateProgress (0.5+0.5*ptId/(id+1));
abort = this->GetAbortExecute();
}
verts->InsertCellPoint(ptId);
}
output->SetVerts(verts);
verts->Delete();
}
// Update ourselves
//
output->SetPoints(newPts);
newPts->Delete();
output->Squeeze();
vtkDebugMacro(<<"Masked " << numPts << " original points to "
<< id+1 << " points");
}
//----------------------------------------------------------------------------
void vtkMaskPoints::PrintSelf(ostream& os, vtkIndent indent)
{
this->Superclass::PrintSelf(os,indent);
os << indent << "Generate Vertices: "
<< (this->GenerateVertices ? "On\n" : "Off\n");
os << indent << "MaximumNumberOfPoints: "
<< this->MaximumNumberOfPoints << "\n";
os << indent << "On Ratio: " << this->OnRatio << "\n";
os << indent << "Offset: " << this->Offset << "\n";
os << indent << "Random Mode: " << (this->RandomMode ? "On\n" : "Off\n");
}
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