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/*=========================================================================
Program: Visualization Toolkit
Module: vtkActor2DCollection.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 "vtkActor2DCollection.h"
#include "vtkObjectFactory.h"
vtkStandardNewMacro(vtkActor2DCollection);
// protected function to delete an element. Internal use only.
void vtkActor2DCollection::DeleteElement(vtkCollectionElement *e)
{
vtkCollection::DeleteElement(e);
}
// Desctructor for the vtkActor2DCollection class. This removes all
// objects from the collection.
vtkActor2DCollection::~vtkActor2DCollection()
{
this->RemoveAllItems();
}
// Sort and then render the collection of 2D actors.
void vtkActor2DCollection::RenderOverlay(vtkViewport* viewport)
{
if (this->NumberOfItems != 0)
{
this->Sort();
vtkActor2D* tempActor;
vtkCollectionSimpleIterator adit;
for ( this->InitTraversal(adit);
(tempActor = this->GetNextActor2D(adit));)
{
// Make sure that the actor is visible before rendering
if (tempActor->GetVisibility() == 1)
{
tempActor->RenderOverlay(viewport);
}
}
}
}
// Add an actor to the list. The new actor is
// inserted in the list according to it's layer
// number.
void vtkActor2DCollection::AddItem(vtkActor2D *a)
{
vtkCollectionElement* indexElem;
vtkCollectionElement* elem = new vtkCollectionElement;
// Check if the top item is NULL
if (this->Top == NULL)
{
vtkDebugMacro(<<"vtkActor2DCollection::AddItem - Adding item to top of the list");
this->Top = elem;
elem->Item = a;
elem->Next = NULL;
this->Bottom = elem;
this->NumberOfItems++;
a->Register(this);
return;
}
for (indexElem = this->Top;
indexElem != NULL;
indexElem = indexElem->Next)
{
vtkActor2D* tempActor = static_cast<vtkActor2D*>(indexElem->Item);
if (a->GetLayerNumber() < tempActor->GetLayerNumber())
{
// The indexElem item's layer number is larger, so swap
// the new item and the indexElem item.
vtkDebugMacro(<<"vtkActor2DCollection::AddItem - Inserting item");
elem->Item = indexElem->Item;
elem->Next = indexElem->Next;
indexElem->Item = a;
indexElem->Next = elem;
this->NumberOfItems++;
a->Register(this);
return;
}
}
//End of list found before a larger layer number
vtkDebugMacro(<<"vtkActor2DCollection::AddItem - Adding item to end of the list");
elem->Item = a;
elem->Next = NULL;
this->Bottom->Next = elem;
this->Bottom = elem;
this->NumberOfItems++;
a->Register(this);
}
// Sorts the vtkActor2DCollection by layer number. Smaller layer
// numbers are first. Layer numbers can be any integer value.
void vtkActor2DCollection::Sort()
{
int index;
vtkDebugMacro(<<"vtkActor2DCollection::Sort");
int numElems = this->GetNumberOfItems();
// Create an array of pointers to actors
vtkActor2D** actorPtrArr = new vtkActor2D* [numElems];
vtkDebugMacro(<<"vtkActor2DCollection::Sort - Getting actors from collection");
// Start at the beginning of the collection
vtkCollectionSimpleIterator ait;
this->InitTraversal(ait);
// Fill the actor array with the items in the collection
for (index = 0; index < numElems; index++)
{
actorPtrArr[index] = this->GetNextActor2D(ait);
}
vtkDebugMacro(<<"vtkActor2DCollection::Sort - Starting selection sort");
// Start the sorting - selection sort
int i, j, min;
vtkActor2D* t;
for (i = 0; i < numElems - 1; i++)
{
min = i;
for (j = i + 1; j < numElems ; j++)
{
if(actorPtrArr[j]->GetLayerNumber() < actorPtrArr[min]->GetLayerNumber())
{
min = j;
}
}
t = actorPtrArr[min];
actorPtrArr[min] = actorPtrArr[i];
actorPtrArr[i] = t;
}
vtkDebugMacro(<<"vtkActor2DCollection::Sort - Selection sort done.");
for (index = 0; index < numElems; index++)
{
vtkDebugMacro(<<"vtkActor2DCollection::Sort - actorPtrArr["<<index<<"] layer: " <<
actorPtrArr[index]->GetLayerNumber());
}
vtkDebugMacro(<<"vtkActor2DCollection::Sort - Rearraging the linked list.");
// Now move the items around in the linked list -
// keep the links the same, but swap around the items
vtkCollectionElement* elem = this->Top;
elem->Item = actorPtrArr[0];
for (i = 1; i < numElems; i++)
{
elem = elem->Next;
elem->Item = actorPtrArr[i];
}
delete[] actorPtrArr;
}
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