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//
// 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 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
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