321 lines
8.0 KiB
C++
321 lines
8.0 KiB
C++
/*
|
|
* 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
|
|
*
|
|
* http://www.apache.org/licenses/LICENSE-2.0
|
|
*
|
|
* 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.
|
|
*
|
|
* Copyright 2010-2017 Danny Robson <danny@nerdcruft.net>
|
|
*/
|
|
|
|
|
|
#include "region.hpp"
|
|
|
|
#include "debug.hpp"
|
|
|
|
#include "coord/iostream.hpp"
|
|
|
|
#include <array>
|
|
|
|
using util::region;
|
|
|
|
|
|
//-----------------------------------------------------------------------------
|
|
template <size_t S, typename T>
|
|
util::region<S,T>::region (extent_t _extent):
|
|
region (point_t::origin (), _extent)
|
|
{
|
|
debug::sanity (*this);
|
|
}
|
|
|
|
|
|
//-----------------------------------------------------------------------------
|
|
template <size_t S, typename T>
|
|
util::region<S,T>::region (point_t _p,
|
|
extent_t _e):
|
|
p (_p),
|
|
e (_e)
|
|
{
|
|
debug::sanity (*this);
|
|
}
|
|
|
|
|
|
//-----------------------------------------------------------------------------
|
|
template <size_t S, typename T>
|
|
util::region<S,T>::region (point_t _a,
|
|
point_t _b):
|
|
region (_a, extent_t { _b - _a })
|
|
{
|
|
// This check must allow for zero area (but non-zero dimension) regions.
|
|
// Some code paths need to support this degenerate case. It's ugly but
|
|
// simplifies generalisation. eg, vertical linear bezier curves.
|
|
CHECK (all (_a <= _b));
|
|
|
|
debug::sanity (*this);
|
|
}
|
|
|
|
|
|
//-----------------------------------------------------------------------------
|
|
template <size_t S, typename T>
|
|
T
|
|
util::region<S,T>::area (void) const
|
|
{
|
|
return e.area ();
|
|
}
|
|
|
|
|
|
//-----------------------------------------------------------------------------
|
|
template <size_t S, typename T>
|
|
T
|
|
util::region<S,T>::diameter (void) const
|
|
{
|
|
return e.diameter ();
|
|
}
|
|
|
|
|
|
//-----------------------------------------------------------------------------
|
|
template <size_t S, typename T>
|
|
typename util::region<S,T>::extent_t
|
|
util::region<S,T>::magnitude (void) const
|
|
{
|
|
return e;
|
|
}
|
|
|
|
|
|
//-----------------------------------------------------------------------------
|
|
template <size_t S, typename T>
|
|
typename util::region<S,T>::extent_t
|
|
util::region<S,T>::magnitude (extent_t _e)
|
|
{
|
|
e = _e;
|
|
return e;
|
|
}
|
|
|
|
|
|
//-----------------------------------------------------------------------------
|
|
template <size_t S, typename T>
|
|
bool
|
|
util::region<S,T>::empty (void) const
|
|
{
|
|
return almost_zero (area ());
|
|
}
|
|
|
|
|
|
//-----------------------------------------------------------------------------
|
|
template <size_t S, typename T>
|
|
typename util::region<S,T>::point_t
|
|
util::region<S,T>::base (void) const
|
|
{
|
|
return p;
|
|
}
|
|
|
|
|
|
//-----------------------------------------------------------------------------
|
|
template <size_t S, typename T>
|
|
typename util::region<S,T>::point_t
|
|
util::region<S,T>::away (void) const
|
|
{
|
|
return p + e;
|
|
}
|
|
|
|
|
|
//-----------------------------------------------------------------------------
|
|
template <size_t S, typename T>
|
|
typename util::region<S,T>::point_t
|
|
util::region<S,T>::centre (void) const
|
|
{
|
|
return p + e / T{2};
|
|
}
|
|
|
|
|
|
//-----------------------------------------------------------------------------
|
|
template <size_t S, typename T>
|
|
typename util::region<S,T>::point_t
|
|
util::region<S,T>::closest (point_t q) const
|
|
{
|
|
point_t out;
|
|
|
|
for (size_t i = 0; i < S; ++i)
|
|
out[i] = q[i] < p[i] ? p[i] :
|
|
q[i] > p[i] ? p[i] + e[i] :
|
|
q[i];
|
|
|
|
return out;
|
|
}
|
|
|
|
|
|
//-----------------------------------------------------------------------------
|
|
// FIXME: This will fail with an actual infinite range (NaNs will be generated
|
|
// in the conditionals).
|
|
template <size_t S, typename T>
|
|
bool
|
|
util::region<S,T>::intersects (region<S,T> rhs) const
|
|
{
|
|
for (size_t i = 0; i < S; ++i)
|
|
if ( p[i] >= rhs.p[i] + rhs.e[i] ||
|
|
rhs.p[i] >= p[i] + e[i])
|
|
{ return false; }
|
|
|
|
return true;
|
|
}
|
|
|
|
|
|
//-----------------------------------------------------------------------------
|
|
template <size_t S, typename T>
|
|
typename region<S,T>::point_t
|
|
region<S,T>::constrain (point_t q) const noexcept
|
|
{
|
|
for (size_t i = 0; i < S; ++i)
|
|
q[i] = clamp (q[i], p[i], p[i] + e[i]);
|
|
return q;
|
|
}
|
|
|
|
|
|
//-----------------------------------------------------------------------------
|
|
template<size_t S, typename T>
|
|
util::region<S,T>
|
|
util::region<S,T>::intersection (region<S,T> rhs) const
|
|
{
|
|
// find the intersection corners
|
|
point_t a, b;
|
|
|
|
for (size_t i = 0; i < S; ++i) {
|
|
a[i] = util::max (p[i], rhs.p[i]);
|
|
b[i] = util::min (p[i] + e[i], rhs.p[i] + rhs.e[i]);
|
|
|
|
if (b[i] < a[i])
|
|
throw std::logic_error ("no overlap");
|
|
}
|
|
|
|
return { a, b };
|
|
}
|
|
|
|
|
|
//-----------------------------------------------------------------------------
|
|
template <size_t S, typename T>
|
|
bool
|
|
util::region<S,T>::covers (region<S, T> r) const noexcept
|
|
{
|
|
return all (p <= r.p) && all (p + e >= r.p + r.e);
|
|
}
|
|
|
|
|
|
///////////////////////////////////////////////////////////////////////////////
|
|
template <size_t S, typename T>
|
|
util::region<S,T>
|
|
util::region<S,T>::inset (T mag) const
|
|
{
|
|
return inset (util::vector<S,T> {mag});
|
|
}
|
|
|
|
|
|
//-----------------------------------------------------------------------------
|
|
template <size_t S, typename T>
|
|
util::region<S,T>
|
|
util::region<S,T>::inset (vector<S,T> mag) const
|
|
{
|
|
// ensure we have enough space to trim off our total extent
|
|
CHECK (all (e >= T{2} * mag));
|
|
|
|
return {
|
|
p + mag,
|
|
e - T{2} * mag
|
|
};
|
|
}
|
|
|
|
|
|
//-----------------------------------------------------------------------------
|
|
template <size_t S, typename T>
|
|
util::region<S,T>
|
|
util::region<S,T>::expand (vector<S,T> v) const
|
|
{
|
|
return {
|
|
p - v,
|
|
e + v * T{2}
|
|
};
|
|
}
|
|
|
|
|
|
//-----------------------------------------------------------------------------
|
|
template <size_t S, typename T>
|
|
util::region<S,T>
|
|
util::region<S,T>::expand (T mag) const
|
|
{
|
|
return expand (vector<S,T> {mag});
|
|
}
|
|
|
|
|
|
///////////////////////////////////////////////////////////////////////////////
|
|
template <size_t S, typename T>
|
|
util::region<S,T>
|
|
util::region<S,T>::operator+ (vector<S,T> rhs) const
|
|
{
|
|
return { p + rhs, e };
|
|
}
|
|
|
|
|
|
//-----------------------------------------------------------------------------
|
|
template <size_t S, typename T>
|
|
util::region<S,T>
|
|
util::region<S,T>::operator- (vector<S,T> rhs) const
|
|
{
|
|
return { p - rhs, e };
|
|
}
|
|
|
|
|
|
///////////////////////////////////////////////////////////////////////////////
|
|
template <size_t S, typename T>
|
|
bool
|
|
util::region<S,T>::operator== (region rhs) const
|
|
{
|
|
return p == rhs.p && e == rhs.e;
|
|
}
|
|
|
|
|
|
///////////////////////////////////////////////////////////////////////////////
|
|
template <size_t S, typename T>
|
|
std::ostream&
|
|
util::operator<< (std::ostream &os, const util::region<S,T> &rhs) {
|
|
return os << "{ position: " << rhs.p << ", extent: " << rhs.e << " }";
|
|
}
|
|
|
|
|
|
///////////////////////////////////////////////////////////////////////////////
|
|
namespace util::debug {
|
|
template <size_t S, typename T>
|
|
struct validator<util::region<S,T>> {
|
|
static bool is_valid (const util::region<S,T> &r)
|
|
{
|
|
return util::debug::is_valid (r.p) && util::debug::is_valid (r.e);
|
|
}
|
|
};
|
|
}
|
|
|
|
|
|
///////////////////////////////////////////////////////////////////////////////
|
|
#define INSTANTIATE_S_T(S,T) \
|
|
template struct util::region<S,T>; \
|
|
template std::ostream& util::operator<< (std::ostream&, const region<S,T>&); \
|
|
template struct util::debug::validator<util::region<S,T>>;
|
|
|
|
#define INSTANTIATE(T) \
|
|
INSTANTIATE_S_T(2,T) \
|
|
INSTANTIATE_S_T(3,T)
|
|
|
|
INSTANTIATE(int16_t);
|
|
INSTANTIATE(int32_t);
|
|
INSTANTIATE(int64_t);
|
|
|
|
INSTANTIATE(uint16_t)
|
|
INSTANTIATE(uint32_t)
|
|
INSTANTIATE(uint64_t)
|
|
|
|
INSTANTIATE(float)
|
|
INSTANTIATE(double)
|