libcruft-util/geom/ellipse.hpp

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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
*
* 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 2015 Danny Robson <danny@nerdcruft.net>
*/
#ifndef __UTIL_GEOM_ELLIPSE_HPP
#define __UTIL_GEOM_ELLIPSE_HPP
#include <cstdlib>
#include "../point.hpp"
#include "../vector.hpp"
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namespace util::geom {
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///////////////////////////////////////////////////////////////////////////
template <size_t S, typename ValueT>
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struct ellipse {
util::point<S,ValueT> origin;
util::vector<S,ValueT> radius;
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};
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}
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///////////////////////////////////////////////////////////////////////////////
#include "sample.hpp"
#include <cmath>
#include <random>
namespace util::geom {
template <typename T, template <size_t,typename> class K, typename G>
struct sampler<2,T,K,G>
{
static util::point<2,T> fn (K<2,T> k, G &g)
{
std::uniform_real_distribution<T> dist;
float phi = dist (g) * 2 * pi<T>;
float rho = std::sqrt (dist (g));
return util::point<2,T> {
std::cos (phi),
std::sin (phi)
} * rho * k.radius + k.origin.template as<util::vector> ();
}
};
}
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#endif