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/* bzflag
* Copyright (c) 1993-2025 Tim Riker
*
* This package is free software; you can redistribute it and/or
* modify it under the terms of the license found in the file
* named COPYING that should have accompanied this file.
*
* THIS PACKAGE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*/
/* Extents
* Encapsulates the data to record the minimum and maximum
* values along each axis of an axis-aligned bounding box.
*/
#ifndef BZF_EXTENTS_H
#define BZF_EXTENTS_H
#include "common.h"
class Extents
{
public:
Extents();
Extents(const float mins[3], const float maxs[3]);
void reset();
Extents& operator=(const Extents&);
void set(const float mins[3], const float maxs[3]);
void expandToBox(const Extents& box); // expand to contain the box
void expandToPoint(const float[3]); // expand to contain the point
void addMargin(float margin); // widen the extents by "margin"
float getWidth(int axis) const;
bool touches(const Extents& orig) const;
bool contains(const Extents& orig) const;
private:
// force passing by reference
Extents(const Extents& orig);
public:
float mins[3];
float maxs[3];
};
inline void Extents::reset()
{
mins[0] = mins[1] = mins[2] = +MAXFLOAT;
maxs[0] = maxs[1] = maxs[2] = -MAXFLOAT;
return;
}
inline void Extents::set(const float _mins[3], const float _maxs[3])
{
mins[0] = _mins[0];
mins[1] = _mins[1];
mins[2] = _mins[2];
maxs[0] = _maxs[0];
maxs[1] = _maxs[1];
maxs[2] = _maxs[2];
return;
}
inline Extents::Extents()
{
reset();
return;
}
inline Extents::Extents(const float _mins[3], const float _maxs[3])
{
set(_mins, _maxs);
return;
}
inline Extents& Extents::operator=(const Extents& orig)
{
mins[0] = orig.mins[0];
mins[1] = orig.mins[1];
mins[2] = orig.mins[2];
maxs[0] = orig.maxs[0];
maxs[1] = orig.maxs[1];
maxs[2] = orig.maxs[2];
return *this;
}
inline void Extents::expandToBox(const Extents& test)
{
// test mins
if (test.mins[0] < mins[0])
mins[0] = test.mins[0];
if (test.mins[1] < mins[1])
mins[1] = test.mins[1];
if (test.mins[2] < mins[2])
mins[2] = test.mins[2];
// test maxs
if (test.maxs[0] > maxs[0])
maxs[0] = test.maxs[0];
if (test.maxs[1] > maxs[1])
maxs[1] = test.maxs[1];
if (test.maxs[2] > maxs[2])
maxs[2] = test.maxs[2];
return;
}
inline void Extents::expandToPoint(const float point[3])
{
// test mins
if (point[0] < mins[0])
mins[0] = point[0];
if (point[1] < mins[1])
mins[1] = point[1];
if (point[2] < mins[2])
mins[2] = point[2];
// test maxs
if (point[0] > maxs[0])
maxs[0] = point[0];
if (point[1] > maxs[1])
maxs[1] = point[1];
if (point[2] > maxs[2])
maxs[2] = point[2];
return;
}
inline bool Extents::touches(const Extents& test) const
{
if ((mins[0] > test.maxs[0]) || (maxs[0] < test.mins[0]) ||
(mins[1] > test.maxs[1]) || (maxs[1] < test.mins[1]) ||
(mins[2] > test.maxs[2]) || (maxs[2] < test.mins[2]))
return false;
return true;
}
inline bool Extents::contains(const Extents& test) const
{
if ((mins[0] < test.mins[0]) && (maxs[0] > test.maxs[0]) &&
(mins[1] < test.mins[1]) && (maxs[1] > test.maxs[1]) &&
(mins[2] < test.mins[2]) && (maxs[2] > test.maxs[2]))
return true;
return false;
}
inline void Extents::addMargin(float margin)
{
// subtract from the mins
mins[0] -= margin;
mins[1] -= margin;
mins[2] -= margin;
// add to the maxs
maxs[0] += margin;
maxs[1] += margin;
maxs[2] += margin;
return;
}
inline float Extents::getWidth(int axis) const
{
return (maxs[axis] - mins[axis]);
}
#endif // BZF_EXTENTS_H
// Local Variables: ***
// mode: C++ ***
// tab-width: 4 ***
// c-basic-offset: 4 ***
// indent-tabs-mode: nil ***
// End: ***
// ex: shiftwidth=4 tabstop=4
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