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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.
=========================================================================*/
// .NAME vtkFollower - a subclass of actor that always faces the camera
// .SECTION Description
// 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.
// .SECTION see also
// vtkActor vtkCamera vtkAxisFollower vtkProp3DFollower
#ifndef vtkFollower_h
#define vtkFollower_h
#include "vtkRenderingCoreModule.h" // For export macro
#include "vtkActor.h"
class vtkCamera;
class VTKRENDERINGCORE_EXPORT vtkFollower : public vtkActor
{
public:
vtkTypeMacro(vtkFollower,vtkActor);
void PrintSelf(ostream& os, vtkIndent indent);
// Description:
// Creates a follower with no camera set
static vtkFollower *New();
// Description:
// 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);
// Description:
// 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.
virtual int RenderOpaqueGeometry(vtkViewport *viewport);
virtual int RenderTranslucentPolygonalGeometry(vtkViewport *viewport);
virtual void Render(vtkRenderer *ren);
// Description:
// Does this prop have some translucent polygonal geometry?
virtual int HasTranslucentPolygonalGeometry();
// Description:
// Release any graphics resources associated with this vtkProp3DFollower.
virtual void ReleaseGraphicsResources(vtkWindow*);
// Description:
// Generate the matrix based on ivars. This method overloads its superclasses
// ComputeMatrix() method due to the special vtkFollower matrix operations.
virtual void ComputeMatrix();
// Description:
// Shallow copy of a follower. Overloads the virtual vtkProp method.
void ShallowCopy(vtkProp *prop);
protected:
vtkFollower();
~vtkFollower();
vtkCamera *Camera;
vtkActor *Device;
private:
vtkFollower(const vtkFollower&); // Not implemented.
void operator=(const vtkFollower&); // Not implemented.
// hide the two parameter Render() method from the user and the compiler.
virtual void Render(vtkRenderer *, vtkMapper *) {}
//Internal matrices to avoid New/Delete for performance reasons
vtkMatrix4x4 *InternalMatrix;
};
#endif
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