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- /*
- * Copyright (C) 2021 Christopher J. Howard
- *
- * This file is part of Antkeeper source code.
- *
- * Antkeeper source code is free software: you can redistribute it and/or modify
- * it under the 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.
- *
- * Antkeeper source code is distributed in the hope that it will be useful,
- * but WITHOUT ANY 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 Antkeeper source code. If not, see <http://www.gnu.org/licenses/>.
- */
-
- #ifndef ANTKEEPER_COLOR_INDEX_HPP
- #define ANTKEEPER_COLOR_INDEX_HPP
-
- namespace color {
-
- /// Functions which operate on color indices.
- namespace index {
-
- /**
- * Approximates the temperature of a star, given its B-V index.
- *
- * @param bv B-V index.
- * @return Correlated color temperature, in Kelvin.
- *
- * @see Ballesteros, F. J. (2012). "New insights into black bodies". EPL 97 (2012) 34008.
- */
- template <class T>
- T bv_to_cct(T bv);
-
- template <class T>
- T bv_to_cct(T bv)
- {
- return T(4600.0) * (T(1.0) / (T(0.92) * bv + T(1.7)) + T(1.0) / (T(0.92) * bv + T(0.62)));
- }
-
- } // namespace index
- } // namespace color
-
- #endif // ANTKEEPER_COLOR_INDEX_HPP
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