0ad/source/maths/BoundingSphere.h

/* Copyright (C) 2019 Wildfire Games.
 * This file is part of 0 A.D.
 *
 * 0 A.D. 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.
 *
 * 0 A.D. is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with 0 A.D.  If not, see <http://www.gnu.org/licenses/>.
 */

#ifndef INCLUDED_BOUNDINGSPHERE
#define INCLUDED_BOUNDINGSPHERE

#include "maths/Vector3D.h"

class CBoundingBoxAligned;

class CBoundingSphere
{
public:
	CBoundingSphere() : m_Radius(0.0f) { }

	CBoundingSphere(const CVector3D& center, float radius) : m_Center(center), m_Radius(radius) { }

	const CVector3D& GetCenter() const
	{
		return m_Center;
	}

	float GetRadius() const
	{
		return m_Radius;
	}

	/**
	 * Construct a bounding sphere that encompasses a bounding box
	 * swept through all possible rotations around the origin.
	 */
	static CBoundingSphere FromSweptBox(const CBoundingBoxAligned& bbox);

	/**
	 * Check if the ray, defined by an origin point and a direction unit vector
	 * interesects with the sphere. The direction should be normalized.
	 */
	bool RayIntersect(const CVector3D& origin, const CVector3D& dir) const;

private:
	CVector3D m_Center;
	float m_Radius;
};

#endif // INCLUDED_BOUNDINGSPHERE