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/*=========================================================================
Program: Visualization Toolkit
Module: vtkRendererCollection.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 "vtkRendererCollection.h"
#include "vtkObjectFactory.h"
#include "vtkRenderWindow.h"
#include <cstdlib>
VTK_ABI_NAMESPACE_BEGIN
vtkStandardNewMacro(vtkRendererCollection);
// Forward the Render() method to each renderer in the list.
void vtkRendererCollection::Render()
{
vtkRenderer *ren, *firstRen;
vtkRenderWindow* renWin;
int numLayers, i;
vtkCollectionSimpleIterator rsit;
this->InitTraversal(rsit);
firstRen = this->GetNextRenderer(rsit);
if (firstRen == nullptr)
{
// We cannot determine the number of layers because there are no
// renderers. No problem, just return.
return;
}
renWin = firstRen->GetRenderWindow();
numLayers = renWin->GetNumberOfLayers();
// Only have the renderers render from back to front. This is necessary
// because transparent renderers clear the z-buffer before each render and
// then overlay their image.
for (i = 0; i < numLayers; i++)
{
for (this->InitTraversal(rsit); (ren = this->GetNextRenderer(rsit));)
{
if (ren->GetLayer() == i)
{
ren->Render();
}
}
}
// Let the user know if they have put a renderer at an unused layer.
for (this->InitTraversal(rsit); (ren = this->GetNextRenderer(rsit));)
{
if (ren->GetLayer() < 0 || ren->GetLayer() >= numLayers)
{
vtkErrorMacro(<< "Invalid layer for renderer: not rendered.");
}
}
}
vtkRenderer* vtkRendererCollection::GetFirstRenderer()
{
if (this->Top == nullptr)
{
return nullptr;
}
else
{
return static_cast<vtkRenderer*>(this->Top->Item);
}
}
//------------------------------------------------------------------------------
void vtkRendererCollection::PrintSelf(ostream& os, vtkIndent indent)
{
this->Superclass::PrintSelf(os, indent);
}
VTK_ABI_NAMESPACE_END
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