libcruft-util/region.hpp

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/*
* This file is part of libgim.
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*
* libgim is free software: you can redistribute it and/or modify it under the
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* 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
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* 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/>.
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*
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* Copyright 2010-2015 Danny Robson <danny@nerdcruft.net>
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*/
#ifndef __UTIL_REGION_HPP
#define __UTIL_REGION_HPP
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#include "extent.hpp"
#include "point.hpp"
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#include "vector.hpp"
#include "types/traits.hpp"
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namespace util {
/**
* A two-dimensional rectangle, with size and position.
*/
template <typename T>
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struct region {
using position_type = T;
using size_type = typename try_unsigned<T>::type;
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static constexpr size_t dimension = 2u;
static constexpr size_t elements = dimension * 2;
using value_type = T;
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position_type x, y;
size_type w, h;
region () = default;
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region (util::point<2,T>, util::extent<size_type>);
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region (util::point<2,T>, util::point<2,T>);
region (T _x, T _y, size_type _w, size_type _h);
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size_type area (void) const;
size_type diameter (void) const;
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util::extent<size_type> size (void) const;
void scale (T factor);
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bool empty (void) const;
point<2,T> base (void) const;
point<2,T> away (void) const;
point<2,T> centre (void) const;
point<2,T> closest (point<2,T>) const;
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// Point and region relation queries
bool includes (const point<2,T>&) const; // inclusive of borders
bool contains (const point<2,T>&) const; // exclusive of borders
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bool intersects (const region<T>&) const; // exclusive of borders
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// Move a point to be within the region bounds
void constrain (point<2,T>&) const;
point<2,T> constrained (const point<2,T>&) const;
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// Compute binary region combinations
region intersection (const region<T>&) const;
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// Compute a region `mag` units into the region
region inset (T mag);
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region expanded (T mag) const;
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region expanded (T w, T h) const;
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region& expand (T mag);
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region& expand (T w, T h);
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// arithmetic operators
region operator+ (vector<2,T>) const;
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// Logical comparison operators
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bool operator ==(const region<T>& rhs) const;
bool operator !=(const region<T>& rhs) const
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{ return !(*this == rhs); }
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// Utility constants
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static const region<T> MAX;
static const region<T> UNIT;
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void sanity (void) const;
};
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typedef region<size_t> region2u;
typedef region<intmax_t> region2i;
typedef region<float> region2f;
template <typename T>
std::ostream& operator<< (std::ostream&, const util::region<T>&);
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}
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#endif