1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
|
/*=========================================================================
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 "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);
/**
* 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.
*/
virtual int RenderOpaqueGeometry(vtkViewport *viewport);
virtual int RenderTranslucentPolygonalGeometry(vtkViewport *viewport);
virtual void Render(vtkRenderer *ren);
//@}
/**
* Does this prop have some translucent polygonal geometry?
*/
virtual int HasTranslucentPolygonalGeometry();
/**
* Release any graphics resources associated with this vtkProp3DFollower.
*/
virtual void ReleaseGraphicsResources(vtkWindow*);
/**
* Generate the matrix based on ivars. This method overloads its superclasses
* ComputeMatrix() method due to the special vtkFollower matrix operations.
*/
virtual void ComputeMatrix();
/**
* 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&) VTK_DELETE_FUNCTION;
void operator=(const vtkFollower&) VTK_DELETE_FUNCTION;
// 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
|
