blender-archive/source/blender/freestyle/intern/geometry/BBox.h

/*
 * ***** BEGIN GPL LICENSE BLOCK *****
 *
 * 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.
 *
 * This program 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 this program; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 *
 * ***** END GPL LICENSE BLOCK *****
 */

#ifndef __BBOX_H__
#define __BBOX_H__

/** \file blender/freestyle/intern/geometry/BBox.h
 *  \ingroup freestyle
 *  \brief A class to hold a bounding box
 *  \author Stephane Grabli
 *  \date 22/05/2003
 */

namespace Freestyle {

template <class Point>
class BBox
{
public:
	inline BBox()
	{
		_empty = true;
	}

	template <class T>
	inline BBox(const T& min_in, const T& max_in) : _min(min_in), _max(max_in)
	{
		_empty = false;
	}

	template <class T>
	inline BBox(const BBox<T>& b) : _min(b.getMin()), _max(b.getMax())
	{
		_empty = false;
	}

	template <class T>
	inline void extendToContain(const T& p)
	{
		if (_empty) {
			_min = p;
			_max = p;
			_empty = false;
			return;
		}
		for (unsigned int i = 0; i < Point::dim(); i++) {
			if (p[i] < _min[i])
				_min[i] = p[i];
			else if (p[i] > _max[i])
				_max[i] = p[i];
		}
		_empty = false;
	}

	inline void clear()
	{
		_empty = true;
	}

	inline bool empty() const
	{
		return _empty;
	}

	inline const Point& getMin() const
	{
		return _min;
	}

	inline const Point& getMax() const
	{
		return _max;
	}

	inline BBox<Point>& operator=(const BBox<Point>& b)
	{
		_min = b.getMin();
		_max = b.getMax();
		_empty = false;
		return *this;
	}

	inline BBox<Point>& operator+=(const BBox<Point>& b)
	{
		if (_empty) {
			_min = b.getMin();
			_max = b.getMax();
			_empty = false;
		}
		else {
			for (unsigned int i = 0; i < Point::dim(); i++) {
				if (b.getMin()[i] < _min[i])
					_min[i] = b.getMin()[i];
				if (b.getMax()[i] > _max[i])
					_max[i] = b.getMax()[i];
			}
		}
		return *this;
	}

	inline bool inside(const Point& p)
	{
		if (empty())
			return false;
		for (unsigned int i = 0; i < Point::dim(); i++) {
			if ((_min[i]>p[i]) || (_max[i]<p[i]))
				return false;
		}
		return true;
	}

private:
	Point _min;
	Point _max;
	bool _empty;
};

template <class Point>
BBox<Point>& operator+(const BBox<Point> &b1, const BBox<Point> &b2)
{
	Point new_min;
	Point new_max;

	for (unsigned int i = 0; i < Point::dim(); i++) {
		new_min[i] = b1.getMin()[i] < b2.getMin()[i] ? b1.getMin()[i] : b2.getMin()[i];
		new_max[i] = b1.getMax()[i] > b2.getMax()[i] ? b1.getMax()[i] : b2.getMax()[i];
	}

	return BBox<Point>(new_min, new_max);
}

} /* namespace Freestyle */

#endif // __BBOX_H__