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
111
112
113
114
115
116
117
118
119
120
121
122
123
|
//
// Filename : SilhouetteGeomEngine.h
// Author(s) : Stephane Grabli
// Purpose : Class to perform all geometric operations dedicated
// to silhouette. That, for example, implies that
// this geom engine has as member data the viewpoint,
// transformations, projections...
// Date of creation : 03/09/2002
//
///////////////////////////////////////////////////////////////////////////////
//
// Copyright (C) : Please refer to the COPYRIGHT file distributed
// with this source distribution.
//
// This program is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public License
// as published by the Free Software Foundation; either version 2
// of the License, or (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
//
///////////////////////////////////////////////////////////////////////////////
#ifndef SILHOUETTEGEOMENGINE_H
# define SILHOUETTEGEOMENGINE_H
# include <vector>
# include "../system/FreestyleConfig.h"
# include "../geometry/Geom.h"
using namespace Geometry;
class SVertex;
class FEdge;
class LIB_VIEW_MAP_EXPORT SilhouetteGeomEngine
{
private:
static Vec3r _Viewpoint; // The viewpoint under which the silhouette has to be computed
static real _translation[3];
static real _modelViewMatrix[4][4]; // the model view matrix (_modelViewMatrix[i][j] means element of line i and column j)
static real _projectionMatrix[4][4]; // the projection matrix (_projectionMatrix[i][j] means element of line i and column j)
static real _transform[4][4]; // the global transformation from world to screen (projection included) (_transform[i][j] means element of line i and column j)
static int _viewport[4]; // the viewport
static real _Focal;
static real _znear;
static real _zfar;
static real _glProjectionMatrix[4][4]; // GL style (column major) projection matrix
static real _glModelViewMatrix[4][4]; // GL style (column major) model view matrix
static bool _isOrthographicProjection;
static SilhouetteGeomEngine *_pInstance;
public:
/*! retrieves an instance on the singleton */
static SilhouetteGeomEngine * getInstance()
{
if(0 == _pInstance)
{
_pInstance = new SilhouetteGeomEngine;
}
return _pInstance;
}
/*! Sets the current viewpoint */
static inline void setViewpoint(const Vec3r& ivp) {_Viewpoint = ivp;}
/*! Sets the current transformation
* iModelViewMatrix
* The 4x4 model view matrix, in column major order (openGL like).
* iProjection matrix
* The 4x4 projection matrix, in column major order (openGL like).
* iViewport
* The viewport. 4 real array: origin.x, origin.y, width, length
* iFocal
* The focal length
*/
static void setTransform(const real iModelViewMatrix[4][4], const real iProjectionMatrix[4][4], const int iViewport[4], real iFocal) ;
/*! Sets the current znear and zfar
*/
static void setFrustum(real iZNear, real iZFar) ;
/* accessors */
static void retrieveViewport(int viewport[4]);
/*! Projects the silhouette in camera coordinates
* This method modifies the ioEdges passed as argument.
* ioVertices
* The vertices to project. It is modified during the
* operation.
*/
static void ProjectSilhouette(std::vector<SVertex*>& ioVertices);
static void ProjectSilhouette(SVertex* ioVertex);
/*! transforms the parameter t defining a 2D intersection for edge fe in order to obtain
* the parameter giving the corresponding 3D intersection.
* Returns the 3D parameter
* fe
* The edge
* t
* The parameter for the 2D intersection.
*/
static real ImageToWorldParameter(FEdge *fe, real t);
/*! From world to image */
static Vec3r WorldToImage(const Vec3r& M);
};
#endif // SILHOUETTEGEOMENGINE_H
|
