TrianglePressureForceField.h

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/******************************************************************************
*       SOFA, Simulation Open-Framework Architecture, version 1.0 beta 3      *
*                (c) 2006-2008 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    *
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License *
* for more details.                                                           *
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* You should have received a copy of the GNU Lesser General Public License    *
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* Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301 USA.          *
*******************************************************************************
*                               SOFA :: Modules                               *
*                                                                             *
* Authors: The SOFA Team and external contributors (see Authors.txt)          *
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* Contact information: contact@sofa-framework.org                             *
******************************************************************************/
#ifndef SOFA_COMPONENT_FORCEFIELD_TRIANGLEPRESSUREFORCEFIELD_H
#define SOFA_COMPONENT_FORCEFIELD_TRIANGLEPRESSUREFORCEFIELD_H


#include <sofa/core/componentmodel/behavior/ForceField.h>
#include <sofa/component/topology/TriangleSubsetData.h>



namespace sofa
{

namespace component
{

namespace forcefield
{

using namespace sofa::defaulttype;
using namespace sofa::component::topology;

template<class DataTypes>
class TrianglePressureForceField : public core::componentmodel::behavior::ForceField<DataTypes>, public virtual core::objectmodel::BaseObject
{
public:
    typedef typename DataTypes::VecCoord VecCoord;
    typedef typename DataTypes::VecDeriv VecDeriv;
    typedef typename DataTypes::Coord    Coord   ;
    typedef typename DataTypes::Deriv    Deriv   ;
    typedef typename Coord::value_type   Real    ;

protected: 

   class TrianglePressureInformation
    {
    public:
            Real area;
            Deriv force;

            TrianglePressureInformation() {}
            TrianglePressureInformation(const TrianglePressureInformation &e)
            : area(e.area),force(e.force)
            { }
    };

   TriangleSubsetData<TrianglePressureInformation> trianglePressureMap;

    sofa::core::componentmodel::topology::BaseMeshTopology* _topology;

    Data<Deriv> pressure;

    Data<std::string> triangleList;

    Data<Deriv> normal;

    Data<Real> dmin; // coordinates min of the plane for the vertex selection
    Data<Real> dmax;// coordinates max of the plane for the vertex selection

public:

    TrianglePressureForceField():
    pressure(initData(&pressure, "pressure", "Pressure force per unit area"))
    , triangleList(initData(&triangleList,std::string(),"triangleList", "Indices of triangles separated with commas where a pressure is applied"))
    , normal(initData(&normal,"normal", "Normal direction for the plane selection of triangles"))
    , dmin(initData(&dmin,(Real)0.0, "dmin", "Minimum distance from the origin along the normal direction"))
    , dmax(initData(&dmax,(Real)0.0, "dmax", "Maximum distance from the origin along the normal direction"))
    {
    }

    virtual ~TrianglePressureForceField();

    virtual void init();

    virtual void addForce (VecDeriv& f, const VecCoord& x, const VecDeriv& v);
    virtual void addDForce (VecDeriv& /*df*/, const VecDeriv& /*dx*/) {}
    virtual double getPotentialEnergy(const VecCoord& x);

    // Handle topological changes
    virtual void handleTopologyChange();


    void draw();

    void setDminAndDmax(const double _dmin, const double _dmax) { 
        dmin.setValue((Real)_dmin);dmax.setValue((Real)_dmax);}
    void setNormal(const Coord n) { normal.setValue(n);}
 
    void setPressure(Deriv _pressure) { this->pressure = _pressure; updateTriangleInformation(); }

protected :
    void selectTrianglesAlongPlane();
    void selectTrianglesFromString();
    void updateTriangleInformation();
    void initTriangleInformation();
    bool isPointInPlane(Coord p) {
        Real d=dot(p,normal.getValue());
        if ((d>dmin.getValue())&& (d<dmax.getValue())) 
            return true;
        else
            return false;
    }
};


} // namespace forcefield

} // namespace component

} // namespace sofa

#endif /* _TRIANGLEPRESSUREFORCEFIELD_H_ */