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/******************************************************************************
*       SOFA, Simulation Open-Framework Architecture, version 1.0 beta 4      *
*                (c) 2006-2009 MGH, INRIA, USTL, UJF, CNRS                    *
*                                                                             *
* This library is free software; you can redistribute it and/or modify it     *
* under the terms of the GNU Lesser General Public License as published by    *
* the Free Software Foundation; either version 2.1 of the License, or (at     *
* your option) any later version.                                             *
*                                                                             *
* This library 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 Lesser General Public License *
* for more details.                                                           *
*                                                                             *
* You should have received a copy of the GNU Lesser General Public License    *
* along with this library; if not, write to the Free Software Foundation,     *
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301 USA.          *
*******************************************************************************
*                               SOFA :: Modules                               *
*                                                                             *
* Authors: The SOFA Team and external contributors (see Authors.txt)          *
*                                                                             *
* Contact information: contact@sofa-framework.org                             *
******************************************************************************/
#ifndef SOFA_COMPONENT_COLLISION_FRICTIONCONTACT_H
#define SOFA_COMPONENT_COLLISION_FRICTIONCONTACT_H

#include <sofa/core/componentmodel/collision/Contact.h>
#include <sofa/core/componentmodel/collision/Intersection.h>
#include <sofa/component/mapping/BarycentricMapping.h>
#include <sofa/component/constraint/UnilateralInteractionConstraint.h>
#include <sofa/helper/Factory.h>
#include <sofa/component/collision/BarycentricContactMapper.h>

namespace sofa
{

namespace component
{

namespace collision
{

using namespace sofa::defaulttype;

class Identifier
{
public:
	Identifier()
	{
		if (!availableId.empty())
		{
			id = availableId.front();
			availableId.pop_front();
		}
		else
			id = cpt++;

	//	sout << id << sendl;
	}

	virtual ~Identifier()
	{
		availableId.push_back(id);
	}

protected:
	static unsigned int cpt;
	unsigned int id;
	static std::list<unsigned int> availableId;
};


template <class TCollisionModel1, class TCollisionModel2>
class FrictionContact : public core::componentmodel::collision::Contact, public Identifier
{
public:
	typedef TCollisionModel1 CollisionModel1;
	typedef TCollisionModel2 CollisionModel2;
	typedef core::componentmodel::collision::Intersection Intersection;
	typedef typename CollisionModel1::DataTypes DataTypes1;
	typedef typename CollisionModel2::DataTypes DataTypes2;
	typedef core::componentmodel::behavior::MechanicalState<DataTypes1> MechanicalState1;
	typedef core::componentmodel::behavior::MechanicalState<DataTypes2> MechanicalState2;
	typedef typename CollisionModel1::Element CollisionElement1;
	typedef typename CollisionModel2::Element CollisionElement2;
        typedef core::componentmodel::collision::DetectionOutputVector OutputVector;
        typedef core::componentmodel::collision::TDetectionOutputVector<CollisionModel1,CollisionModel2> TOutputVector;

protected:
	CollisionModel1* model1;
	CollisionModel2* model2;
	Intersection* intersectionMethod;

	ContactMapper<CollisionModel1,DataTypes1> mapper1;
	ContactMapper<CollisionModel2,DataTypes2> mapper2;

	constraint::UnilateralInteractionConstraint<Vec3Types>* c;
	core::objectmodel::BaseContext* parent;

	double mu;

public:

	FrictionContact(CollisionModel1* model1, CollisionModel2* model2, Intersection* intersectionMethod);
	virtual ~FrictionContact();

	void cleanup();

	std::pair<core::CollisionModel*,core::CollisionModel*> getCollisionModels() { return std::make_pair(model1,model2); }

	void setDetectionOutputs(OutputVector* outputs);

	void createResponse(core::objectmodel::BaseContext* group);

	void removeResponse();
};

long cantorPolynomia(unsigned long x, unsigned long y)
{
	// Polynome de Cantor de N� sur N bijectif f(x,y)=((x+y)^2+3x+y)/2
	return ((x+y)*(x+y)+3*x+y)/2;
}

} // collision

} // component

} // sofa

#endif // SOFA_COMPONENT_COLLISION_FRICTIONCONTACT_H