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/*=========================================================================
Program: Visualization Toolkit
Module: $RCSfile: vtkImplicitFunctionToImageStencil.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 "vtkImplicitFunctionToImageStencil.h"
#include "vtkImageStencilData.h"
#include "vtkImplicitFunction.h"
#include "vtkInformation.h"
#include "vtkInformationVector.h"
#include "vtkObjectFactory.h"
#include "vtkStreamingDemandDrivenPipeline.h"
#include <math.h>
vtkCxxRevisionMacro(vtkImplicitFunctionToImageStencil, "$Revision: 1.12 $");
vtkStandardNewMacro(vtkImplicitFunctionToImageStencil);
vtkCxxSetObjectMacro(vtkImplicitFunctionToImageStencil,Input, vtkImplicitFunction);
//----------------------------------------------------------------------------
vtkImplicitFunctionToImageStencil::vtkImplicitFunctionToImageStencil()
{
this->SetNumberOfInputPorts(0);
this->Threshold = 0;
this->Input = NULL;
}
//----------------------------------------------------------------------------
vtkImplicitFunctionToImageStencil::~vtkImplicitFunctionToImageStencil()
{
this->SetInput(NULL);
}
//----------------------------------------------------------------------------
void vtkImplicitFunctionToImageStencil::PrintSelf(ostream& os,
vtkIndent indent)
{
this->Superclass::PrintSelf(os,indent);
os << indent << "Input: " << this->Input << "\n";
os << indent << "Threshold: " << this->Threshold << "\n";
}
//----------------------------------------------------------------------------
// set up the clipping extents from an implicit function by brute force
// (i.e. by evaluating the function at each and every voxel)
int vtkImplicitFunctionToImageStencil::RequestData(
vtkInformation *request,
vtkInformationVector **inputVector,
vtkInformationVector *outputVector)
{
this->Superclass::RequestData(request, inputVector, outputVector);
vtkInformation *outInfo = outputVector->GetInformationObject(0);
vtkImageStencilData *data = vtkImageStencilData::SafeDownCast(
outInfo->Get(vtkDataObject::DATA_OBJECT()));
vtkImplicitFunction *function = this->Input;
double *spacing = data->GetSpacing();
double *origin = data->GetOrigin();
double threshold = this->Threshold;
// if the input is not set then punt
if (!function)
{
return 1;
}
// for conversion of (idX,idY,idZ) into (x,y,z)
double point[3];
// for keeping track of progress
unsigned long count = 0;
int extent[6];
data->GetExtent(extent);
unsigned long target = (unsigned long)
((extent[5] - extent[4] + 1)*(extent[3] - extent[2] + 1)/50.0);
target++;
// loop through all voxels
for (int idZ = extent[4]; idZ <= extent[5]; idZ++)
{
point[2] = idZ*spacing[2] + origin[2];
for (int idY = extent[2]; idY <= extent[3]; idY++)
{
point[1] = idY*spacing[1] + origin[1];
int state = 1; // inside or outside, start outside
int r1 = extent[0];
int r2 = extent[1];
if (count%target == 0)
{
this->UpdateProgress(count/(50.0*target));
}
count++;
for (int idX = extent[0]; idX <= extent[1]; idX++)
{
point[0] = idX*spacing[0] + origin[0];
int newstate = 1;
if (function->FunctionValue(point) < threshold)
{
newstate = -1;
if (newstate != state)
{ // sub extent starts
r1 = idX;
}
}
else if (newstate != state)
{ // sub extent ends
r2 = idX - 1;
data->InsertNextExtent(r1, r2, idY, idZ);
}
state = newstate;
} // for idX
if (state == -1)
{ // if inside at end, cap off the sub extent
data->InsertNextExtent(r1, extent[1], idY, idZ);
}
} // for idY
} // for idZ
return 1;
}
int vtkImplicitFunctionToImageStencil::RequestInformation(
vtkInformation *,
vtkInformationVector **,
vtkInformationVector *outputVector)
{
vtkInformation *outInfo = outputVector->GetInformationObject(0);
// this is an odd source that can produce any requested size. so its whole
// extent is essentially infinite. This would not be a great source to
// connect to some sort of writer or viewer. For a sanity check we will
// limit the size produced to something reasonable (depending on your
// definition of reasonable)
outInfo->Set(vtkStreamingDemandDrivenPipeline::WHOLE_EXTENT(),
0, VTK_LARGE_INTEGER >> 2,
0, VTK_LARGE_INTEGER >> 2,
0, VTK_LARGE_INTEGER >> 2);
return 1;
}
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