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wlsunset/color_math.h

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Move math out of main
2020-09-13 01:22:18 +00:00
#ifndef _COLOR_MATH_H
#define _COLOR_MATH_H
Gracefully handle midnight sun/polar night The sun trajectory calculation previously emitted garbage if midnight sun or polar night phenomena was in effect. To fix this, the calculation is overhauled to report if the computation failed, and if so, which specific phenomena was the cause. Timing recalulation uses this information to change out of the normal state that uses the four sun position timings, into a static state where wlsunset simply waits a day at a time for a normal sun trajectory pattern to be restored. In this state, a fixedc high/low temperature is set as appropriate for the phenomena. A transition phase replicating the previous day's sunrise is used to smooth out entry into a midnight sun, which would otherwise cause a jarring instant-daylight setting.
2020-10-17 11:23:48 +00:00
#include "math.h"
Split state from config, cleanup
2020-10-14 15:57:34 +00:00
#include "time.h"
Gracefully handle midnight sun/polar night The sun trajectory calculation previously emitted garbage if midnight sun or polar night phenomena was in effect. To fix this, the calculation is overhauled to report if the computation failed, and if so, which specific phenomena was the cause. Timing recalulation uses this information to change out of the normal state that uses the four sun position timings, into a static state where wlsunset simply waits a day at a time for a normal sun trajectory pattern to be restored. In this state, a fixedc high/low temperature is set as appropriate for the phenomena. A transition phase replicating the previous day's sunrise is used to smooth out entry into a midnight sun, which would otherwise cause a jarring instant-daylight setting.
2020-10-17 11:23:48 +00:00
// These are macros so they can be applied to constants
#define DEGREES(rad) ((rad) * 180.0 / M_PI)
#define RADIANS(deg) ((deg) * M_PI / 180.0)
enum sun_condition {
NORMAL,
MIDNIGHT_SUN,
POLAR_NIGHT,
SUN_CONDITION_LAST
};
Split state from config, cleanup
2020-10-14 15:57:34 +00:00
struct sun {
time_t dawn;
time_t sunrise;
time_t sunset;
time_t dusk;
};
Move longitude time correction out of calc_sun calc_sun reported sun trajectory in seconds since the start of a UTC day, as they would occur for the specified UTC day. The caller would then add the UTC timestamp for the start of a UTC day to these numbers. This lead to complications, as e.g. a sunrise in China would be a negative value, as it occurred in the last UTC day. Futhermore, the start of a UTC day was used to signal the need for new sun calculations. This would lead to recalculations to possibly occur after its results were needed, such as after sunrise when the target longitude deviated significantly from the prime meridian. To fix this, we apply longitude time correction to the start of day calculation. This way recalculation will occur on the start of the longitude local day, close midnight for the observer. We also remove the longitude time correction from calc_sun, so that it simply returning the number of seconds since the start of the local day of the observer. The caller then adds the start of the longitude local day to get the final numbers.
2020-10-19 11:18:07 +00:00
enum sun_condition calc_sun(struct tm *tm, double latitude, struct sun *sun);
Move math out of main
2020-09-13 01:22:18 +00:00
void calc_whitepoint(int temp, double *rw, double *gw, double *bw);
#endif