/usr/include/libwildmagic/Wm5MassSpringArbitrary.h is in libwildmagic-dev 5.13-1.
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// Copyright (c) 1998-2014
// Distributed under the Boost Software License, Version 1.0.
// http://www.boost.org/LICENSE_1_0.txt
// http://www.geometrictools.com/License/Boost/LICENSE_1_0.txt
//
// File Version: 5.0.1 (2010/10/01)
#ifndef WM5MASSSPRINGARBITRARY_H
#define WM5MASSSPRINGARBITRARY_H
#include "Wm5PhysicsLIB.h"
#include "Wm5ParticleSystem.h"
namespace Wm5
{
template <class Real, class TVector>
class WM5_PHYSICS_ITEM MassSpringArbitrary
: public ParticleSystem<Real,TVector>
{
public:
// Construction and destruction. This class represents a set of M
// masses that are connected by S springs with arbitrary topology. The
// function SetSpring(...) should be called for each spring that you
// want in the system.
MassSpringArbitrary (int numParticles, int numSprings, Real step);
virtual ~MassSpringArbitrary ();
int GetNumSprings () const;
void SetSpring (int spring, int particle0, int particle1,
Real constant, Real length);
void GetSpring (int spring, int& particle0, int& particle1,
Real& constant, Real& length) const;
Real& Constant (int spring);
Real& Length (int spring);
// Callback for acceleration (ODE solver uses x" = F/m) applied to
// particle i. The positions and velocities are not necessarily
// m_akPosition and m_akVelocity since the ODE solver evaluates the
// impulse function at intermediate positions.
virtual TVector Acceleration (int i, Real time,
const TVector* positions, const TVector* velocities);
// The default external force is zero. Derive a class from this one to
// provide nonzero external forces such as gravity, wind, friction,
// and so on. This function is called by Acceleration(...) to append the
// acceleration F/m generated by the external force F.
virtual TVector ExternalAcceleration (int i, Real time,
const TVector* positions, const TVector* velocities);
protected:
using ParticleSystem<Real,TVector>::mNumParticles;
using ParticleSystem<Real,TVector>::mInvMasses;
class Spring
{
public:
int Particle0, Particle1;
Real Constant, Length;
};
int mNumSprings;
Spring* mSprings;
// Each particle has an associated array of spring indices for those
// springs adjacent to the particle. The set elements are spring
// indices, not indices of adjacent particles.
std::set<int>* mAdjacent;
};
typedef MassSpringArbitrary<float,Vector2f> MassSpringArbitrary2f;
typedef MassSpringArbitrary<double,Vector2d> MassSpringArbitrary2d;
typedef MassSpringArbitrary<float,Vector3f> MassSpringArbitrary3f;
typedef MassSpringArbitrary<double,Vector3d> MassSpringArbitrary3d;
}
#endif
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