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/*=========================================================================
Program: Visualization Toolkit
Module: vtkFollower.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 vtkFollower
* @brief a subclass of actor that always faces the camera
*
* vtkFollower is a subclass of vtkActor that always follows its specified
* camera. More specifically it will not change its position or scale,
* but it will continually update its orientation so that it is right side
* up and facing the camera. This is typically used for text labels in a
* scene. All of the adjustments that can be made to an actor also will
* take effect with a follower. So, if you change the orientation of the
* follower by 90 degrees, then it will follow the camera, but be off by
* 90 degrees.
*
* @sa
* vtkActor vtkCamera vtkAxisFollower vtkProp3DFollower
*/
#ifndef vtkFollower_h
#define vtkFollower_h
#include "vtkActor.h"
#include "vtkRenderingCoreModule.h" // For export macro
VTK_ABI_NAMESPACE_BEGIN
class vtkCamera;
class VTKRENDERINGCORE_EXPORT vtkFollower : public vtkActor
{
public:
vtkTypeMacro(vtkFollower, vtkActor);
void PrintSelf(ostream& os, vtkIndent indent) override;
/**
* Creates a follower with no camera set
*/
static vtkFollower* New();
///@{
/**
* Set/Get the camera to follow. If this is not set, then the follower
* won't know who to follow.
*/
virtual void SetCamera(vtkCamera*);
vtkGetObjectMacro(Camera, vtkCamera);
///@}
///@{
/**
* This causes the actor to be rendered. It in turn will render the actor's
* property, texture map and then mapper. If a property hasn't been
* assigned, then the actor will create one automatically.
*/
int RenderOpaqueGeometry(vtkViewport* viewport) override;
int RenderTranslucentPolygonalGeometry(vtkViewport* viewport) override;
virtual void Render(vtkRenderer* ren);
///@}
/**
* Release any graphics resources associated with this vtkProp3DFollower.
*/
void ReleaseGraphicsResources(vtkWindow*) override;
/**
* Generate the matrix based on ivars. This method overloads its superclasses
* ComputeMatrix() method due to the special vtkFollower matrix operations.
*/
void ComputeMatrix() override;
/**
* Shallow copy of a follower. Overloads the virtual vtkProp method.
*/
void ShallowCopy(vtkProp* prop) override;
protected:
vtkFollower();
~vtkFollower() override;
vtkCamera* Camera;
vtkActor* Device;
// Internal matrices to avoid New/Delete for performance reasons
vtkMatrix4x4* InternalMatrix;
private:
vtkFollower(const vtkFollower&) = delete;
void operator=(const vtkFollower&) = delete;
// hide the two parameter Render() method from the user and the compiler.
void Render(vtkRenderer*, vtkMapper*) override {}
};
VTK_ABI_NAMESPACE_END
#endif
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