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/*=========================================================================
Program: Visualization Toolkit
Module: vtkImageSliceCollection.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 "vtkImageSliceCollection.h"
#include "vtkImageProperty.h"
#include "vtkImageSlice.h"
#include "vtkObjectFactory.h"
VTK_ABI_NAMESPACE_BEGIN
vtkStandardNewMacro(vtkImageSliceCollection);
//------------------------------------------------------------------------------
void vtkImageSliceCollection::PrintSelf(ostream& os, vtkIndent indent)
{
this->Superclass::PrintSelf(os, indent);
}
//------------------------------------------------------------------------------
// protected function to delete an element. Internal use only.
void vtkImageSliceCollection::DeleteElement(vtkCollectionElement* e)
{
vtkCollection::DeleteElement(e);
}
//------------------------------------------------------------------------------
// Destructor for the vtkImageSliceCollection class. This removes all
// objects from the collection.
vtkImageSliceCollection::~vtkImageSliceCollection()
{
this->RemoveAllItems();
}
//------------------------------------------------------------------------------
// Add an image to the list. The new image is inserted in the
// list according to it's layer number.
void vtkImageSliceCollection::AddItem(vtkImageSlice* a)
{
vtkCollectionElement* elem = new vtkCollectionElement;
elem->Item = a;
// Find insertion location according to the layer number
vtkCollectionElement* prevElem = nullptr;
int layerNumber = a->GetProperty()->GetLayerNumber();
for (vtkCollectionElement* indexElem = this->Top; indexElem != nullptr;
indexElem = indexElem->Next)
{
vtkImageSlice* tempImage = static_cast<vtkImageSlice*>(indexElem->Item);
if (layerNumber < tempImage->GetProperty()->GetLayerNumber())
{
break;
}
prevElem = indexElem;
}
// Insert the new element into the linked list
if (prevElem == nullptr)
{
elem->Next = this->Top;
this->Top = elem;
}
else
{
elem->Next = prevElem->Next;
prevElem->Next = elem;
}
// Check if this is the new bottom
if (elem->Next == nullptr)
{
this->Bottom = elem;
}
this->NumberOfItems++;
a->Register(this);
}
//------------------------------------------------------------------------------
// small helper struct
class vtkImageSliceLayerPair
{
public:
vtkImageSlice* image;
int layer;
};
//------------------------------------------------------------------------------
// Sorts the vtkImageSliceCollection by layer number. Smaller layer
// numbers are first. Layer numbers can be any integer value.
void vtkImageSliceCollection::Sort()
{
// Create a temporary array of pointers to images
int numElems = this->GetNumberOfItems();
vtkImageSliceLayerPair defaultLayerArray[8];
vtkImageSliceLayerPair* layerArray = defaultLayerArray;
if (numElems > 8)
{
layerArray = new vtkImageSliceLayerPair[numElems];
}
// Start at the beginning of the collection
vtkCollectionSimpleIterator ait;
this->InitTraversal(ait);
// Fill the image array with the items in the collection
for (int ii = 0; ii < numElems; ii++)
{
vtkImageSlice* image = this->GetNextImage(ait);
layerArray[ii].image = image;
layerArray[ii].layer = image->GetProperty()->GetLayerNumber();
}
// The collection will be small (often with n=2) so do a brute-force
// selection sort, which also keeps items with the same layer number
// in the same order as before the sort.
for (int i = 0; i < numElems - 1; i++)
{
int imin = i;
int lmin = layerArray[imin].layer;
int j = i + 1;
do
{
int l = layerArray[j].layer;
if (l < lmin)
{
imin = j;
lmin = l;
}
} while (++j < numElems);
vtkImageSliceLayerPair t = layerArray[imin];
layerArray[imin] = layerArray[i];
layerArray[i] = t;
}
// Now move the items around in the linked list -
// keep the links the same, but swap around the items
vtkCollectionElement* elem = this->Top;
for (int jj = 0; jj < numElems; jj++)
{
elem->Item = layerArray[jj].image;
elem = elem->Next;
}
if (layerArray != defaultLayerArray)
{
delete[] layerArray;
}
}
VTK_ABI_NAMESPACE_END
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