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/******************************************************************/
/* This file is part of the homework assignments for CSCI-427/527 */
/* at The College of William & Mary and authored by Pieter Peers. */
/* No part of this file, whether altered or in original form, can */
/* be distributed or used outside the context of CSCI-427/527 */
/* without consent of either the College of William & Mary or */
/* Pieter Peers. */
/******************************************************************/
#include "interval.h"
#include "constants.h"
//////////////////
// Constrructor //
//////////////////
interval::interval(float lower, float upper)
{
_lower = lower;
_upper = upper;
// ensure that _lower < _upper
if(_upper < _lower) std::swap(_upper, _lower);
}
interval::interval(const interval& i)
{
_lower = i._lower;
_upper = i._upper;
}
///////////////
// Operators //
///////////////
interval& interval::operator=(const interval& i)
{
_assign(i);
return *this;
}
interval interval::operator+(float v) const
{
return interval(_lower + v, _upper + v);
}
interval interval::operator-(float v) const
{
return interval(_lower - v, _upper - v);
}
interval interval::operator*(float v) const
{
return interval(_lower * v, _upper * v);
}
interval interval::operator/(float v) const
{
return interval(_lower / v, _upper / v);
}
interval& interval::operator+=(float v)
{
_lower += v;
_upper += v;
return *this;
}
interval& interval::operator-=(float v)
{
_lower -= v;
_upper -= v;
return *this;
}
interval& interval::operator*=(float v)
{
_lower *= v;
_upper *= v;
// ensure that _lower < _upper
if(_upper < _lower) std::swap(_upper, _lower);
// Done.
return *this;
}
interval& interval::operator/=(float v)
{
_lower /= v;
_upper /= v;
// ensure that _lower < _upper
if(_upper < _lower) std::swap(_upper, _lower);
// Done.
return *this;
}
////////////////
// Inspectors //
////////////////
float interval::lower(void) const
{
return _lower;
}
float interval::upper(void) const
{
return _upper;
}
bool interval::empty(void) const
{
return (_upper - _lower < EPSILON);
}
//////////////
// Mutators //
//////////////
void interval::intersect(const interval& i)
{
_lower = std::max(_lower, i._lower);
_upper = std::min(_upper, i._upper);
}
/////////////////////
// Private Methods //
/////////////////////
void interval::_assign(const interval& i)
{
_lower = i._lower;
_upper = i._upper;
}
void interval::_swap(interval& i)
{
std::swap(_lower, i._lower);
std::swap(_upper, i._upper);
}
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