225 lines
5.2 KiB
C++
225 lines
5.2 KiB
C++
///////////////////////////////////////////////////////////////////////////
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//
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// Copyright (c) 2002, Industrial Light & Magic, a division of Lucas
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// Digital Ltd. LLC
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//
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// All rights reserved.
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are
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// met:
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above
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// copyright notice, this list of conditions and the following disclaimer
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// in the documentation and/or other materials provided with the
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// distribution.
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// * Neither the name of Industrial Light & Magic nor the names of
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// its contributors may be used to endorse or promote products derived
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// from this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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//
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///////////////////////////////////////////////////////////////////////////
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#ifndef INCLUDED_IMATHINTERVAL_H
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#define INCLUDED_IMATHINTERVAL_H
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//-------------------------------------------------------------------
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//
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// class Imath::Interval<class T>
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// --------------------------------
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//
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// An Interval has a min and a max and some miscellaneous
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// functions. It is basically a Box<T> that allows T to be
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// a scalar.
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//
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//-------------------------------------------------------------------
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#include "ImathVec.h"
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namespace Imath {
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template <class T>
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class Interval
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{
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public:
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//-------------------------
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// Data Members are public
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//-------------------------
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T min;
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T max;
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//-----------------------------------------------------
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// Constructors - an "empty" Interval is created by default
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//-----------------------------------------------------
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Interval();
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Interval(const T& point);
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Interval(const T& minT, const T& maxT);
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//--------------------------------
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// Operators: we get != from STL
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//--------------------------------
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bool operator == (const Interval<T> &src) const;
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//------------------
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// Interval manipulation
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//------------------
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void makeEmpty();
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void extendBy(const T& point);
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void extendBy(const Interval<T>& interval);
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//---------------------------------------------------
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// Query functions - these compute results each time
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//---------------------------------------------------
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T size() const;
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T center() const;
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bool intersects(const T &point) const;
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bool intersects(const Interval<T> &interval) const;
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//----------------
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// Classification
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//----------------
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bool hasVolume() const;
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bool isEmpty() const;
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};
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//--------------------
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// Convenient typedefs
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//--------------------
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typedef Interval <float> Intervalf;
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typedef Interval <double> Intervald;
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typedef Interval <short> Intervals;
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typedef Interval <int> Intervali;
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//----------------
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// Implementation
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//----------------
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template <class T>
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inline Interval<T>::Interval()
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{
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makeEmpty();
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}
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template <class T>
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inline Interval<T>::Interval(const T& point)
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{
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min = point;
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max = point;
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}
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template <class T>
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inline Interval<T>::Interval(const T& minV, const T& maxV)
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{
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min = minV;
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max = maxV;
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}
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template <class T>
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inline bool
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Interval<T>::operator == (const Interval<T> &src) const
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{
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return (min == src.min && max == src.max);
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}
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template <class T>
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inline void
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Interval<T>::makeEmpty()
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{
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min = limits<T>::max();
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max = limits<T>::min();
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}
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template <class T>
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inline void
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Interval<T>::extendBy(const T& point)
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{
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if ( point < min )
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min = point;
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if ( point > max )
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max = point;
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}
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template <class T>
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inline void
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Interval<T>::extendBy(const Interval<T>& interval)
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{
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if ( interval.min < min )
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min = interval.min;
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if ( interval.max > max )
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max = interval.max;
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}
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template <class T>
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inline bool
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Interval<T>::intersects(const T& point) const
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{
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return point >= min && point <= max;
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}
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template <class T>
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inline bool
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Interval<T>::intersects(const Interval<T>& interval) const
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{
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return interval.max >= min && interval.min <= max;
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}
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template <class T>
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inline T
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Interval<T>::size() const
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{
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return max-min;
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}
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template <class T>
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inline T
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Interval<T>::center() const
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{
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return (max+min)/2;
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}
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template <class T>
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inline bool
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Interval<T>::isEmpty() const
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{
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return max < min;
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}
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template <class T>
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inline bool Interval<T>::hasVolume() const
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{
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return max > min;
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}
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} // namespace Imath
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#endif
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