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| -rw-r--r-- | src/state.c | 42 | ||||
| -rw-r--r-- | src/state.h | 70 |
2 files changed, 112 insertions, 0 deletions
diff --git a/src/state.c b/src/state.c new file mode 100644 index 0000000..f3bb6b6 --- /dev/null +++ b/src/state.c @@ -0,0 +1,42 @@ +/** + * Copyright © 2016 Mattias Andrée <maandree@member.fsf.org> + * + * Permission is hereby granted, free of charge, to any person obtaining a + * copy of this software and associated documentation files (the "Software"), + * to deal in the Software without restriction, including without limitation + * the rights to use, copy, modify, merge, publish, distribute, sublicense, + * and/or sell copies of the Software, and to permit persons to whom the + * Software is furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice shall be included in + * all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL + * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING + * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER + * DEALINGS IN THE SOFTWARE. + */ +#include "state.h" +#include "solar.h" + + + +/** + * Is it daytime, night, perhaps some kind of twilight? + * + * @param elevation The Sun's apparent elevation. + * @return The time of the day. + */ +enum darkness +get_darkness(double elevation) +{ + if (elevation > SOLAR_ELEVATION_SUNSET_SUNRISE) return DAYTIME; + if (elevation > SOLAR_ELEVATION_CIVIL_DUSK_DAWN) return CIVIL_TWILIGHT; + if (elevation > SOLAR_ELEVATION_NAUTICAL_DUSK_DAWN) return NAUTICAL_TWILIGHT; + if (elevation > SOLAR_ELEVATION_ASTRONOMICAL_DUSK_DAWN) return ASTRONOMICAL_TWILIGHT; + return NIGHT; +} + diff --git a/src/state.h b/src/state.h new file mode 100644 index 0000000..a88d73f --- /dev/null +++ b/src/state.h @@ -0,0 +1,70 @@ +/** + * Copyright © 2016 Mattias Andrée <maandree@member.fsf.org> + * + * Permission is hereby granted, free of charge, to any person obtaining a + * copy of this software and associated documentation files (the "Software"), + * to deal in the Software without restriction, including without limitation + * the rights to use, copy, modify, merge, publish, distribute, sublicense, + * and/or sell copies of the Software, and to permit persons to whom the + * Software is furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice shall be included in + * all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL + * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING + * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER + * DEALINGS IN THE SOFTWARE. + */ + + + +/** + * The times of the day, by degree of darkness. + */ +enum darkness { + /** + * Not calculated yet. + */ + UNKNOWN = -1, + + /** + * Hopefully, it is bright outside. + */ + DAYTIME = 0, + + /** + * The sky is golden. The golden "hour". + * Also known as BMCT (dawn) or EECT (dusk). + */ + CIVIL_TWILIGHT = 1, + + /** + * The sky is pink and blue. + */ + NAUTICAL_TWILIGHT = 2, + + /** + * The sky is medium dark blue. + */ + ASTRONOMICAL_TWILIGHT = 3, + + /** + * The sky is reallu dark blue. + */ + NIGHT = 4 +}; + + + +/** + * Is it daytime, night, perhaps some kind of twilight? + * + * @param elevation The Sun's apparent elevation. + * @return The time of the day. + */ +enum darkness get_darkness(double elevation); + |