HuntCrossleyContact.h

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#ifndef SimTK_SIMBODY_HUNT_CROSSLEY_CONTACT_H_
#define SimTK_SIMBODY_HUNT_CROSSLEY_CONTACT_H_

/* -------------------------------------------------------------------------- *
 *                      SimTK Core: SimTK Simbody(tm)                         *
 * -------------------------------------------------------------------------- *
 * This is part of the SimTK Core biosimulation toolkit originating from      *
 * Simbios, the NIH National Center for Physics-Based Simulation of           *
 * Biological Structures at Stanford, funded under the NIH Roadmap for        *
 * Medical Research, grant U54 GM072970. See https://simtk.org.               *
 *                                                                            *
 * Portions copyright (c) 2006-7 Stanford University and the Authors.         *
 * Authors: Michael Sherman                                                   *
 * Contributors:                                                              *
 *                                                                            *
 * Permission is hereby granted, free of charge, to any person obtaining a    *
 * copy of this software and associated documentation files (the "Software"), *
 * to deal in the Software without restriction, including without limitation  *
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,   *
 * and/or sell copies of the Software, and to permit persons to whom the      *
 * Software is furnished to do so, subject to the following conditions:       *
 *                                                                            *
 * The above copyright notice and this permission notice shall be included in *
 * all copies or substantial portions of the Software.                        *
 *                                                                            *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR *
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,   *
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL    *
 * THE AUTHORS, CONTRIBUTORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,    *
 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR      *
 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE  *
 * USE OR OTHER DEALINGS IN THE SOFTWARE.                                     *
 * -------------------------------------------------------------------------- */

#include "SimTKcommon.h"

#include "simbody/internal/common.h"
#include "simbody/internal/ForceSubsystem.h"

#include <cassert>

namespace SimTK {

class MultibodySystem;

class SimTK_SIMBODY_EXPORT HuntCrossleyContact : public ForceSubsystem {
public:
    HuntCrossleyContact();
    explicit HuntCrossleyContact(MultibodySystem&);

    int addSphere(MobilizedBodyIndex body, const Vec3& center,
                  const Real& radius,
                  const Real& stiffness,     // E (plane strain)
                  const Real& dissipation);  // c (1/v)

    int addHalfSpace(MobilizedBodyIndex body, const UnitVec3& normal,
                     const Real& height,
                     const Real& stiffness,     // E (plane strain)
                     const Real& dissipation);  // c (1/v)

    SimTK_PIMPL_DOWNCAST(HuntCrossleyContact, ForceSubsystem);
private:
    class HuntCrossleyContactRep& updRep();
    const HuntCrossleyContactRep& getRep() const;
};

} // namespace SimTK

#endif // SimTK_SIMBODY_HUNT_CROSSLEY_CONTACT_H_