From c5223db9a1569f006e69fceb966a5b7098db7504 Mon Sep 17 00:00:00 2001 From: Mattias Andrée Date: Thu, 7 Jul 2016 09:48:37 +0200 Subject: Add daytime and nighttime test MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Signed-off-by: Mattias Andrée --- src/libred.h | 18 +++++++++++++++++- 1 file changed, 17 insertions(+), 1 deletion(-) (limited to 'src/libred.h') diff --git a/src/libred.h b/src/libred.h index 0bccd84..81066a3 100644 --- a/src/libred.h +++ b/src/libred.h @@ -87,10 +87,26 @@ * Test whether it is amateur astronomical twilight. * * @param ELEV:double The current elevation. - * @return 1 if is astronomical twilight, 0 otherwise. + * @return 1 if is amatuer astronomical twilight, 0 otherwise. */ #define LIBRED_IS_AMATEUR_ASTRONOMICAL_TWILIGHT(ELEV) ((-18.0 <= (ELEV)) && ((ELEV) <= -15.0)) +/** + * Test whether it is nighttime. + * + * @param ELEV:double The current elevation. + * @return 1 if is nighttime, 0 otherwise. + */ +#define LIBRED_IS_NIGHTTIME(ELEV) ((ELEV) < -18.0) + +/** + * Test whether it is daytime. + * + * @param ELEV:double The current elevation. + * @return 1 if is daytime, 0 otherwise. + */ +#define LIBRED_IS_DAYTIME(ELEV) ((ELEV) > -32.0 / 60.0) + /** * Calculates the Sun's elevation as apparent -- cgit v1.2.3-70-g09d2