2014-04-20 06:25:25 +00:00
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/*=============================================================================
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2015-01-10 10:13:57 +00:00
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Copyright (c) 2011-2015 Bolero MURAKAMI
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2014-04-20 06:25:25 +00:00
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https://github.com/bolero-MURAKAMI/Sprout
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Distributed under the Boost Software License, Version 1.0. (See accompanying
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file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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=============================================================================*/
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#ifndef SPROUT_NUMERIC_DFT_DETAIL_TRINAGLE_HPP
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#define SPROUT_NUMERIC_DFT_DETAIL_TRINAGLE_HPP
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#include <sprout/config.hpp>
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#include <sprout/math/constants.hpp>
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#include <sprout/math/sin.hpp>
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#include <sprout/math/asin.hpp>
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namespace sprout {
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namespace detail {
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template<typename T>
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inline SPROUT_CONSTEXPR T
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triangle_value_impl(T const& t) {
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typedef double elem_type;
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using sprout::sin;
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using sprout::asin;
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return T(sprout::math::two_div_pi<elem_type>()) * asin(sin(T(sprout::math::two_pi<elem_type>()) * t));
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}
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template<typename T, typename Index>
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inline SPROUT_CONSTEXPR T
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triangle_value(T const& frequency, T const& amplitude, T const& phase, Index i) {
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return amplitude * sprout::detail::triangle_value_impl(frequency * T(i) + phase);
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}
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} // namespace detail
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} // namespace sprout
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#endif // #ifndef SPROUT_NUMERIC_DFT_DETAIL_TRINAGLE_HPP
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