1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
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;
}
|
