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author | Mattias Andrée <maandree@kth.se> | 2016-07-07 09:51:06 +0200 |
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committer | Mattias Andrée <maandree@kth.se> | 2016-07-07 09:51:14 +0200 |
commit | 06ab6aa9040f31e39ebd587586b03639b49b64b3 (patch) | |
tree | 6746bed496649acadcdf7a7ae23ee9812ba0fa99 | |
parent | Add daytime and nighttime test (diff) | |
download | libred-06ab6aa9040f31e39ebd587586b03639b49b64b3.tar.gz libred-06ab6aa9040f31e39ebd587586b03639b49b64b3.tar.bz2 libred-06ab6aa9040f31e39ebd587586b03639b49b64b3.tar.xz |
Add golden hour and blue hour
Signed-off-by: Mattias Andrée <maandree@kth.se>
-rw-r--r-- | src/libred.h | 36 |
1 files changed, 36 insertions, 0 deletions
diff --git a/src/libred.h b/src/libred.h index 81066a3..3cc2c86 100644 --- a/src/libred.h +++ b/src/libred.h @@ -50,6 +50,26 @@ */ #define LIBRED_SOLAR_ELEVATION_AMATEUR_ASTRONOMICAL_DUSK_DAWN (-15.0) +/** + * The Sun's lowest elevation during the golden hour, measured in degrees. + */ +#define LIBRED_SOLAR_ELEVATION_GOLDEN_HOUR_LOW (-4.0) + +/** + * The Sun's highest elevation during the golden hour, measured in degrees. + */ +#define LIBRED_SOLAR_ELEVATION_GOLDEN_HOUR_HIGH (6.0) + +/** + * The Sun's lowest elevation during the blue hour, measured in degrees. + */ +#define LIBRED_SOLAR_ELEVATION_BLUE_HOUR_LOW (-6.0) + +/** + * The Sun's highest elevation during the blue hour, measured in degrees. + */ +#define LIBRED_SOLAR_ELEVATION_BLUE_HOUR_HIGH (-4.0) + /** * Test whether it is twilight. @@ -107,6 +127,22 @@ */ #define LIBRED_IS_DAYTIME(ELEV) ((ELEV) > -32.0 / 60.0) +/** + * Test whether it is the golden hour. + * + * @param ELEV:double The current elevation. + * @return 1 if is golden hour, 0 otherwise. + */ +#define LIBRED_IS_GOLDEN_HOUR(ELEV) ((-4.0 <= (ELEV)) && ((ELEV) <= 6.0)) + +/** + * Test whether it is the blue hour. + * + * @param ELEV:double The current elevation. + * @return 1 if is blue hour, 0 otherwise. + */ +#define LIBRED_IS_BLUE_HOUR(ELEV) ((-6.0 <= (ELEV)) && ((ELEV) <= -4.0)) + /** * Calculates the Sun's elevation as apparent |