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/*=========================================================================
Program: Visualization Toolkit
Module: vtkAssemblyNode.h
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.
=========================================================================*/
/**
* @class vtkAssemblyNode
* @brief represent a node in an assembly
*
* vtkAssemblyNode represents a node in an assembly. It is used by
* vtkAssemblyPath to create hierarchical assemblies of props. The
* props can be either 2D or 3D.
*
* An assembly node refers to a vtkProp, and possibly a vtkMatrix4x4.
* Nodes are used by vtkAssemblyPath to build fully evaluated path
* (matrices are concatenated through the path) that is used by picking
* and other operations involving assemblies.
*
* @warning
* The assembly node is guaranteed to contain a reference to an instance
* of vtkMatrix4x4 if the prop referred to by the node is of type
* vtkProp3D (or subclass). The matrix is evaluated through the assembly
* path, so the assembly node's matrix is a function of its location in
* the vtkAssemblyPath.
*
* @warning
* vtkAssemblyNode does not reference count its association with vtkProp.
* Therefore, do not create an assembly node, associate a prop with it,
* delete the prop, and then try to dereference the prop. The program
* will break! (Reason: vtkAssemblyPath (which uses vtkAssemblyNode)
* create self-referencing loops that destroy reference counting.)
*
* @sa
* vtkAssemblyPath vtkProp vtkPicker vtkMatrix4x4
*/
#ifndef vtkAssemblyNode_h
#define vtkAssemblyNode_h
#include "vtkObject.h"
#include "vtkRenderingCoreModule.h" // For export macro
VTK_ABI_NAMESPACE_BEGIN
class vtkProp;
class vtkMatrix4x4;
class VTKRENDERINGCORE_EXPORT vtkAssemblyNode : public vtkObject
{
public:
/**
* Create an assembly node.
*/
static vtkAssemblyNode* New();
vtkTypeMacro(vtkAssemblyNode, vtkObject);
void PrintSelf(ostream& os, vtkIndent indent) override;
///@{
/**
* Set/Get the prop that this assembly node refers to.
*/
virtual void SetViewProp(vtkProp* prop);
vtkGetObjectMacro(ViewProp, vtkProp);
///@}
///@{
/**
* Specify a transformation matrix associated with the prop.
* Note: if the prop is not a type of vtkProp3D, then the
* transformation matrix is ignored (and expected to be NULL).
* Also, internal to this object the matrix is copied because
* the matrix is used for computation by vtkAssemblyPath.
*/
void SetMatrix(vtkMatrix4x4* matrix);
vtkGetObjectMacro(Matrix, vtkMatrix4x4);
///@}
/**
* Override the standard GetMTime() to check for the modified times
* of the prop and matrix.
*/
vtkMTimeType GetMTime() override;
protected:
vtkAssemblyNode();
~vtkAssemblyNode() override;
private:
vtkProp* ViewProp; // reference to vtkProp
vtkMatrix4x4* Matrix; // associated matrix
private:
void operator=(const vtkAssemblyNode&) = delete;
vtkAssemblyNode(const vtkAssemblyNode&) = delete;
};
VTK_ABI_NAMESPACE_END
#endif
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