ellipsoid.h
上传用户:center1979
上传日期:2022-07-26
资源大小:50633k
文件大小:2k
- // ellipsoid.h
- //
- // Copyright (C) 2002-2008, Chris Laurel <claurel@shatters.net>
- //
- // This program is free software; you can redistribute it and/or
- // modify it under the terms of the GNU General Public License
- // as published by the Free Software Foundation; either version 2
- // of the License, or (at your option) any later version.
- #ifndef _CELMATH_ELLIPSOID_H_
- #define _CELMATH_ELLIPSOID_H_
- #include "vecmath.h"
- template<class T> class Ellipsoid
- {
- public:
- Ellipsoid();
- Ellipsoid(const Vector3<T>&);
- Ellipsoid(const Point3<T>&, const Vector3<T>&);
-
- bool contains(const Point3<T>& p) const;
-
- public:
- Point3<T> center;
- Vector3<T> axes;
- };
- typedef Ellipsoid<float> Ellipsoidf;
- typedef Ellipsoid<double> Ellipsoidd;
- /*! Default Ellipsoid constructor. Create a unit sphere centered
- * at the origin.
- */
- template<class T> Ellipsoid<T>::Ellipsoid() :
- center(0, 0, 0), axes(1, 1, 1)
- {
- }
- /*! Created an ellipsoid with the specified semiaxes, centered
- * at the origin.
- */
- template<class T> Ellipsoid<T>::Ellipsoid(const Vector3<T>& _axes) :
- center(0, 0, 0), axes(_axes)
- {
- }
- /*! Create an ellipsoid with the specified center and semiaxes.
- */
- template<class T> Ellipsoid<T>::Ellipsoid(const Point3<T>& _center,
- const Vector3<T>& _axes) :
- center(_center), axes(_axes)
- {
- }
- /*! Test whether the point p lies inside the ellipsoid.
- */
- template<class T> bool Ellipsoid<T>::contains(const Point3<T>& p) const
- {
- Vector3<T> v = p - center;
- v = Vector3<T>(v.x / axes.x, v.y / axes.y, v.z / axes.z);
- return v * v <= (T) 1.0;
- }
- #endif // _CELMATH_ELLIPSOID_H_