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-.\" -*- nroff -*-
-.TH LIBRED.H 0 LIBRED "" "Library Headers"
-.SH NAME
-libred.h \- Solar elevation and blackbody colour calculation
-.SH SYNOPSIS
-.nf
-#include <libred.h>
-.fi
-.PP
-Link with
-.IR -lred .
-.SH DESCRIPTION
-The
-.I <libred.h>
-header defines macros, symbolic constants, and functions for
-calculating solar elevations and blackbody colours. All macros
-and symbolic constants in this header are suitable for use in
-.B #if
-preprocessing directives.
-.PP
-This header defines the follow symbolic constants:
-.TP
-.B LIBRED_SOLAR_APPARENT_RADIUS
-The approximate apparent size of the Sun in degrees. This
-value should be about 0.5(3).
-.TP
-.B LIBRED_SOLAR_ELEVATION_SUNSET_SUNRISE
-The Sun's elevation at sunset and sunrise, measured in degrees.
-This value will always be 0.0.
-.TP
-.B LIBRED_SOLAR_ELEVATION_CIVIL_DUSK_DAWN
-The Sun's elevation at civil dusk and civil dawn, measured in
-degrees. This value will always be -6.0.
-.TP
-.B LIBRED_SOLAR_ELEVATION_NAUTICAL_DUSK_DAWN
-The Sun's elevation at nautical dusk and nautical dawn, measured
-in degrees. This value will always be -12.0.
-.TP
-.B LIBRED_SOLAR_ELEVATION_ASTRONOMICAL_DUSK_DAWN
-The Sun's elevation at astronomical dusk and astronomical dawn,
-measured in degrees. This value will always be -18.0.
-.TP
-.B LIBRED_HIGHEST_TEMPERATURE
-The highest temperature, in kelvins, for which there is a colour
-temperature in the table of colour temperature. Any temperature
-above this is automatically truncated by
-.BR libred_get_colour (3),
-as higher values shall be unnoticeable. Currently, this value
-is 40\ 000.
-.TP
-.B LIBRED_LOWEST_TEMPERATURE
-The lowest temperature, in kelvins, for which there is a colour
-temperature in the table of colour temperature. Any temperature
-below this results in
-.BR libred_get_colour (3)
-failing and setting
-.B errno
-to
-.BR EDOM .
-Currently this value 1000, hypothetical changes will be very small.
-.TP
-.B LIBRED_DELTA_TEMPERATURE
-The temperatures differences between sequential colour temperatures
-in the colour temperatures look up table. Currently this value is 100.
-.PP
-This header defines the follow macros:
-.TP
-.BR LIBRED_IS_TWILIGHT "(const double)"
-Evaluates to 1 if the given expression is between -18.0 and 0.0 (this is,
-between
-.B LIBRED_SOLAR_ELEVATION_ASTRONOMICAL_DUSK_DAWN
-and
-.BR LIBRED_SOLAR_ELEVATION_SUNSET_SUNRISE ),
-inclusively, otherwise, this macro evaluates to 0. The input should be the
-Sun's apparent elevation, and the macro evaluates to 1 if it is currently
-twilight. The given expression is evaluted either once or twice, therefore,
-it must not have side-effects.
-.TP
-.BR LIBRED_IS_CIVIL_TWILIGHT "(const double)"
-Evaluates to 1 if the given expression is between -6.0 and 0.0 (this is,
-between
-.B LIBRED_SOLAR_ELEVATION_CIVIL_DUSK_DAWN
-and
-.BR LIBRED_SOLAR_ELEVATION_SUNSET_SUNRISE ),
-inclusively, otherwise, this macro evaluates to 0. The input should be the
-Sun's apparent elevation, and the macro evaluates to 1 if it is currently
-civil twilight. The given expression is evaluted either once or twice,
-therefore, it must not have side-effects.
-.TP
-.BR LIBRED_IS_NAUTICAL_TWILIGHT "(const double)"
-Evaluates to 1 if the given expression is between -12.0 and -6.0 (this is,
-between
-.B LIBRED_SOLAR_ELEVATION_NAUTICAL_DUSK_DAWN
-and
-.BR LIBRED_SOLAR_ELEVATION_CIVIL_DUSK_DAWN ),
-inclusively, otherwise, this macro evaluates to 0. The input should be the
-Sun's apparent elevation, and the macro evaluates to 1 if it is currently
-nautical twilight. The given expression is evaluted either once or twice,
-therefore, it must not have side-effects.
-.TP
-.BR LIBRED_IS_ASTRONOMICAL_TWILIGHT "(const double)"
-Evaluates to 1 if the given expression is between -18.0 and -12.0 (this is,
-between
-.B LIBRED_SOLAR_ELEVATION_ASTRONOMICAL_DUSK_DAWN
-and
-.BR LIBRED_SOLAR_ELEVATION_NAUTICAL_DUSK_DAWN ),
-inclusively, otherwise, this macro evaluates to 0. The input should be the
-Sun's apparent elevation, and the macro evaluates to 1 if it is currently
-astronomical twilight. The given expression is evaluted either once or twice,
-therefore, it must not have side-effects.
-.PP
-Note that the intervals are closed, and hence their boundaries overlap.
-This is intentional. If it is not twilight it is either daytime or night.
-It is night only if the Sun's apparent elevation is negative.
-.PP
-This header defines the following functions:
-.TP
-*
-.BR libred_solar_elevation (3)
-.TP
-*
-.BR libred_check_timetravel (3)
-.TP
-*
-.BR libred_init_colour (3)
-.TP
-*
-.BR libred_term_colour (3)
-.TP
-*
-.BR libred_get_colour (3)
-.PP
-This header may define
-.B extern int libred_fd
-iff it does it also defines the macro
-.BR LIBRED_HAVE_FD .
-If it does, you want to keep this file descriptor open when you daemonise
-your process. It is set by
-.BR libred_init_colour (3)
-and unset by
-.BR libred_term_colour (3).
-It value is negative (more precisely it is -1) if no file descriptor has
-been opened.
-.SH "FUTURE DIRECTIONS"
-None.
-.SH "SEE ALSO"
-.BR libred (7),
-.BR libred_solar_elevation (3),
-.BR libred_check_timetravel (3),
-.BR libred_init_colour (3),
-.BR libred_term_colour (3),
-.BR libred_get_colour (3)
-.SH LICENSE
-Copyright \(co 2016  Mattias Andrée
-.br
-License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>.
-.br
-This is free software: you are free to change and redistribute it.
-.br
-There is NO WARRANTY, to the extent permitted by law.
-.PP
-Copying and distribution of this manual, with or without modification,
-are permitted in any medium without royalty provided the copyright
-notice and this notice are preserved.  This file is offered as-is,
-without any warranty.
-.SH BUGS
-Please report bugs to <https://github.com/maandree/libred/issues>
-or to <maandree@member.fsf.org>.
-