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/*=========================================================================
Program: Visualization Toolkit
Module: $RCSfile: vtkImageConnector.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 "vtkImageConnector.h"
#include "vtkImageData.h"
#include "vtkObjectFactory.h"
vtkCxxRevisionMacro(vtkImageConnector, "$Revision: 1.20 $");
vtkStandardNewMacro(vtkImageConnector);
//----------------------------------------------------------------------------
vtkImageConnector::vtkImageConnector()
{
this->Seeds = NULL;
this->LastSeed = NULL;
this->ConnectedValue = 255;
this->UnconnectedValue = 128;
}
//----------------------------------------------------------------------------
vtkImageConnector::~vtkImageConnector()
{
this->RemoveAllSeeds();
}
//----------------------------------------------------------------------------
void vtkImageConnector::RemoveAllSeeds()
{
vtkImageConnectorSeed *temp;
while (this->Seeds)
{
temp = this->Seeds;
this->Seeds = temp->Next;
delete temp;
}
this->LastSeed = NULL;
}
//----------------------------------------------------------------------------
vtkImageConnectorSeed *vtkImageConnector::NewSeed(int index[3], void *ptr)
{
vtkImageConnectorSeed *seed = vtkImageConnectorSeed::New();
int idx;
for (idx = 0; idx < 3; ++idx)
{
seed->Index[idx] = index[idx];
}
seed->Pointer = ptr;
seed->Next = NULL;
return seed;
}
//----------------------------------------------------------------------------
// Add a new seed to the end of the seed list.
void vtkImageConnector::AddSeedToEnd(vtkImageConnectorSeed *seed)
{
// Add the seed to the end of the list
if (this->LastSeed == NULL)
{ // no seeds yet
this->LastSeed = this->Seeds = seed;
}
else
{
this->LastSeed->Next = seed;
this->LastSeed = seed;
}
}
//----------------------------------------------------------------------------
// Add a new seed to the start of the seed list.
void vtkImageConnector::AddSeed(vtkImageConnectorSeed *seed)
{
seed->Next = this->Seeds;
this->Seeds = seed;
if ( ! this->LastSeed)
{
this->LastSeed = seed;
}
}
//----------------------------------------------------------------------------
// Removes a seed from the start of the seed list, and returns the seed.
vtkImageConnectorSeed *vtkImageConnector::PopSeed()
{
vtkImageConnectorSeed *seed;
seed = this->Seeds;
this->Seeds = seed->Next;
if (this->Seeds == NULL)
{
this->LastSeed = NULL;
}
return seed;
}
//----------------------------------------------------------------------------
// Input a data of 0's and "UnconnectedValue"s. Seeds of this object are
// used to find connected pixels.
// All pixels connected to seeds are set to ConnectedValue.
// The data has to be unsigned char.
void vtkImageConnector::MarkData(vtkImageData *data, int numberOfAxes, int extent[6])
{
vtkIdType *incs, *pIncs;
int *pExtent;
vtkImageConnectorSeed *seed;
unsigned char *ptr;
int newIndex[3], *pIndex, idx;
long count = 0;
incs = data->GetIncrements();
while (this->Seeds)
{
++count;
seed = this->PopSeed();
// just in case the seed has not been marked visited.
*((unsigned char *)(seed->Pointer)) = this->ConnectedValue;
// Add neighbors
newIndex[0] = seed->Index[0];
newIndex[1] = seed->Index[1];
newIndex[2] = seed->Index[2];
pExtent = extent;
pIncs = incs;
pIndex = newIndex;
for (idx = 0; idx < numberOfAxes; ++idx)
{
// check pixel below
if (*pExtent < *pIndex)
{
ptr = (unsigned char *)(seed->Pointer) - *pIncs;
if (*ptr == this->UnconnectedValue)
{ // add a new seed
--(*pIndex);
*ptr = this->ConnectedValue;
this->AddSeedToEnd(this->NewSeed(newIndex, ptr));
++(*pIndex);
}
}
++pExtent;
// check above pixel
if (*pExtent > *pIndex)
{
ptr = (unsigned char *)(seed->Pointer) + *pIncs;
if (*ptr == this->UnconnectedValue)
{ // add a new seed
++(*pIndex);
*ptr = this->ConnectedValue;
this->AddSeedToEnd(this->NewSeed(newIndex, ptr));
--(*pIndex);
}
}
++pExtent;
// move to next axis
++pIncs;
++pIndex;
}
// Delete seed
delete seed;
}
vtkDebugMacro("Marked " << count << " pixels");
}
void vtkImageConnector::PrintSelf(ostream& os, vtkIndent indent)
{
this->Superclass::PrintSelf(os,indent);
os << indent << "ConnectedValue: " << this->ConnectedValue << "\n";
os << indent << "UnconnectedValue: " << this->UnconnectedValue << "\n";
}
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