float calendar::sunlight() const
{
const time_duration now = time_past_midnight( *this );
const time_duration sunrise = time_past_midnight( this->sunrise() );
const time_duration sunset = time_past_midnight( this->sunset() );
double daylight_level = current_daylight_level();
int current_phase = int(moon());
if ( current_phase > int(MOON_PHASE_MAX)/2 ) {
current_phase = int(MOON_PHASE_MAX) - current_phase;
}
int moonlight = 1 + int(current_phase * MOONLIGHT_PER_QUARTER);
if( now > sunset + twilight_duration || now < sunrise ) { // Night
return moonlight;
} else if( now >= sunrise && now <= sunrise + twilight_duration ) {
const double percent = ( now - sunrise ) / twilight_duration;
return double(moonlight) * (1. - percent) + daylight_level * percent;
} else if( now >= sunset && now <= sunset + twilight_duration ) {
const double percent = ( now - sunset ) / twilight_duration;
return daylight_level * (1. - percent) + double(moonlight) * percent;
} else {
return daylight_level;
}
}
float calendar::sunlight() const
{
int seconds = seconds_past_midnight();
int sunrise_seconds = sunrise().seconds_past_midnight();
int sunset_seconds = sunset().seconds_past_midnight();
double daylight_level = current_daylight_level();
int current_phase = int(moon());
if ( current_phase > int(MOON_PHASE_MAX)/2 ) {
current_phase = int(MOON_PHASE_MAX) - current_phase;
}
int moonlight = 1 + int(current_phase * MOONLIGHT_PER_QUARTER);
if( seconds > sunset_seconds + TWILIGHT_SECONDS || seconds < sunrise_seconds ) { // Night
return moonlight;
} else if( seconds >= sunrise_seconds && seconds <= sunrise_seconds + TWILIGHT_SECONDS ) {
double percent = double(seconds - sunrise_seconds) / TWILIGHT_SECONDS;
return double(moonlight) * (1. - percent) + daylight_level * percent;
} else if( seconds >= sunset_seconds && seconds <= sunset_seconds + TWILIGHT_SECONDS ) {
double percent = double(seconds - sunset_seconds) / TWILIGHT_SECONDS;
return daylight_level * (1. - percent) + double(moonlight) * percent;
} else {
return daylight_level;
}
}
