libcruft-util/region.cpp

144 lines
2.9 KiB
C++

/*
* This file is part of libgim.
*
* libgim 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 3 of the License, or (at your option) any later
* version.
*
* libgim 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 libgim. If not, see <http://www.gnu.org/licenses/>.
*
* Copyright 2010 Danny Robson <danny@blubinc.net>
*/
#include "region.hpp"
#include "enable_if.hpp"
#include "debug.hpp"
#include <type_traits>
using namespace util;
/*
* Rect
*/
template <typename T>
extent<T>::extent (const T _width, const T _height):
width (_width),
height (_height)
{ ; }
template <typename T>
T
extent<T>::area (void) const
{ return width * height; }
template <typename T>
bool
extent<T>::empty (void) const
{ return almost_equal (area(), 0); }
template <typename T>
bool
extent<T>::operator ==(const extent& rhs) const {
return almost_equal (width, rhs.width) &&
almost_equal (height, rhs.height);
}
template <typename T>
void
extent<T>::sanity (void) const
{ check (width >= 0 && height >= 0); }
namespace util {
template <>
void
extent<unsigned int>::sanity (void) const
{ return; }
}
template struct extent<unsigned int>;
template struct extent<double>;
/*
* Region
*/
template <typename T>
region<T>::region (T _x, T _y, T _width, T _height):
x (_x),
y (_y),
width (_width),
height (_height)
{ ; }
template <typename T>
T
region<T>::area (void) const
{ return width * height; }
template <typename T>
bool
region<T>::empty (void) const
{ return almost_equal (area (), 0); }
template <typename T>
bool
region<T>::includes (const point &p) const {
return p.x >= x &&
p.y >= y &&
p.x <= x + width &&
p.y <= y + height;
}
template <typename T>
bool
region<T>::overlaps (const region<T> &rhs) const {
return x < rhs.x + rhs.width &&
x + width > rhs.x &&
y < rhs.y + rhs.height &&
y + height > rhs.y;
}
template <typename T>
bool
region<T>::operator ==(const region& rhs) const
{ return almost_equal (x, rhs.x) &&
almost_equal (y, rhs.y) &&
almost_equal (width, rhs.width) &&
almost_equal (height, rhs.height); }
template <typename T>
void region<T>::sanity (void) const
{ check (width >= 0 && height >= 0); }
namespace util {
template <>
void region<unsigned int>::sanity (void) const
{ return; }
}
template struct region<unsigned int>;
template struct region<double>;