libcruft-util/region.hpp

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/*
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* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
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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"
#include <ostream>
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namespace util {
/**
* A two-dimensional rectangle, with size and position.
*/
template <size_t S, typename T>
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struct region {
using extent_t = util::extent<S,T>;
using point_t = util::point<S,T>;
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using value_type = T;
//---------------------------------------------------------------------
static constexpr size_t dimension = S;
static constexpr size_t elements = extent_t::elements + point_t::elements;
point_t p;
extent_t e;
//---------------------------------------------------------------------
region () = default;
explicit region (extent_t);
region (point_t, extent_t);
region (point_t, point_t);
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//---------------------------------------------------------------------
template <typename U>
constexpr region<S,U> cast (void) const;
//---------------------------------------------------------------------
T area (void) const;
T diameter (void) const;
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extent_t magnitude (void) const;
extent_t magnitude (extent_t);
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void scale (T factor);
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bool empty (void) const;
//---------------------------------------------------------------------
point_t base (void) const;
point_t away (void) const;
point_t centre (void) const;
point_t closest (point_t) const;
//---------------------------------------------------------------------
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// Point and region relation queries
bool includes (point_t) const; // inclusive of borders
bool contains (point_t) const; // exclusive of borders
bool intersects (region<S,T>) const; // exclusive of borders
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// Move a point to be within the region bounds
void constrain (point_t&) const;
point_t constrained (point_t) const;
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// Compute binary region combinations
region intersection (region<S,T>) const;
//---------------------------------------------------------------------
region& resize (extent<S,T>);
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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;
region expanded (vector<S,T>) const;
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region& expand (T mag);
region& expand (vector<S,T>);
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// arithmetic operators
region operator+ (vector<S,T>) const;
region operator- (vector<S,T>) const;
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// Logical comparison operators
bool operator ==(region<S,T> rhs) const;
bool operator !=(region<S,T> rhs) const
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{ return !(*this == rhs); }
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// Utility constants
static constexpr region<S,T> max (void);
static constexpr region<S,T> unit (void);
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void sanity (void) const;
};
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template <typename T> using region2 = region<2,T>;
template <typename T> using region3 = region<3,T>;
using region2u = region2<unsigned>;
using region2i = region2<int>;
using region2f = region2<float>;
using region2d = region2<double>;
template <size_t S, typename T>
std::ostream& operator<< (std::ostream&, const util::region<S,T>&);
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}
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#include "region.ipp"
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#endif