/usr/include/libwildmagic/Wm5MassSpringCurve.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 WM5MASSSPRINGCURVE_H
#define WM5MASSSPRINGCURVE_H
#include "Wm5PhysicsLIB.h"
#include "Wm5ParticleSystem.h"
namespace Wm5
{
template <typename Real, typename TVector>
class WM5_PHYSICS_ITEM MassSpringCurve : public ParticleSystem<Real,TVector>
{
public:
// Construction and destruction. This class represents a set of N-1
// springs connecting N masses that lie on a curve. Spring i connects
// masses i-1 and i for 1 <= i <= N-1.
MassSpringCurve (int numParticles, Real step);
virtual ~MassSpringCurve ();
int GetNumSprings () const;
Real& Constant (int i); // spring constant
Real& Length (int i); // spring resting length
// 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;
int mNumSprings;
Real* mConstants;
Real* mLengths;
};
typedef MassSpringCurve<float,Vector2f> MassSpringCurve2f;
typedef MassSpringCurve<double,Vector2d> MassSpringCurve2d;
typedef MassSpringCurve<float,Vector3f> MassSpringCurve3f;
typedef MassSpringCurve<double,Vector3d> MassSpringCurve3d;
}
#endif
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