/usr/include/libwildmagic/Wm5Curve2.h is in libwildmagic-dev 5.13-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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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 WM5CURVE2_H
#define WM5CURVE2_H
#include "Wm5MathematicsLIB.h"
#include "Wm5Vector2.h"
namespace Wm5
{
template <typename Real>
class WM5_MATHEMATICS_ITEM Curve2
{
public:
// Abstract base class.
Curve2 (Real tmin, Real tmax);
virtual ~Curve2 ();
// Interval on which curve parameter is defined. If you are interested
// in only a subinterval of the actual domain of the curve, you may set
// that subinterval with SetTimeInterval. This function requires that
// tmin < tmax.
Real GetMinTime () const;
Real GetMaxTime () const;
void SetTimeInterval (Real tmin, Real tmax);
// Position and derivatives.
virtual Vector2<Real> GetPosition (Real t) const = 0;
virtual Vector2<Real> GetFirstDerivative (Real t) const = 0;
virtual Vector2<Real> GetSecondDerivative (Real t) const = 0;
virtual Vector2<Real> GetThirdDerivative (Real t) const = 0;
// Differential geometric quantities.
Real GetSpeed (Real t) const;
virtual Real GetLength (Real t0, Real t1) const = 0;
Real GetTotalLength () const;
Vector2<Real> GetTangent (Real t) const;
Vector2<Real> GetNormal (Real t) const;
void GetFrame (Real t, Vector2<Real>& position, Vector2<Real>& tangent,
Vector2<Real>& normal) const;
Real GetCurvature (Real t) const;
// Inverse mapping of s = Length(t) given by t = Length^{-1}(s).
virtual Real GetTime (Real length, int iterations = 32,
Real tolerance = (Real)1e-06) const = 0;
// Subdivision.
void SubdivideByTime (int numPoints, Vector2<Real>*& points) const;
void SubdivideByLength (int numPoints, Vector2<Real>*& points) const;
protected:
// Curve parameter is t where tmin <= t <= tmax.
Real mTMin, mTMax;
};
typedef Curve2<float> Curve2f;
typedef Curve2<double> Curve2d;
}
#endif
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