| 205 | } // namespace |
| 206 | |
| 207 | DayTimeType GetDayTime(time_t timeUtc, double latitude, double longitude) |
| 208 | { |
| 209 | auto const sunrise = CalculateDayEventTime(timeUtc, latitude, longitude, true /* sunrise */); |
| 210 | auto const sunset = CalculateDayEventTime(timeUtc, latitude, longitude, false /* sunrise */); |
| 211 | |
| 212 | // Edge cases: polar day and polar night |
| 213 | if (sunrise.first == DayEventType::PolarDay || sunset.first == DayEventType::PolarDay) |
| 214 | return DayTimeType::PolarDay; |
| 215 | if (sunrise.first == DayEventType::PolarNight || sunset.first == DayEventType::PolarNight) |
| 216 | return DayTimeType::PolarNight; |
| 217 | |
| 218 | if (timeUtc < sunrise.second) |
| 219 | { |
| 220 | auto const prevSunrise = CalculateDayEventTime(timeUtc - kOneDaySeconds, latitude, longitude, true /* sunrise */); |
| 221 | auto const prevSunset = CalculateDayEventTime(timeUtc - kOneDaySeconds, latitude, longitude, false /* sunrise */); |
| 222 | |
| 223 | if (timeUtc >= prevSunset.second) |
| 224 | return DayTimeType::Night; |
| 225 | if (timeUtc < prevSunrise.second) |
| 226 | return DayTimeType::Night; |
| 227 | return DayTimeType::Day; |
| 228 | } |
| 229 | if (timeUtc > sunset.second) |
| 230 | { |
| 231 | auto const nextSunrise = CalculateDayEventTime(timeUtc + kOneDaySeconds, latitude, longitude, true /* sunrise */); |
| 232 | auto const nextSunset = CalculateDayEventTime(timeUtc + kOneDaySeconds, latitude, longitude, false /* sunrise */); |
| 233 | |
| 234 | if (timeUtc < nextSunrise.second) |
| 235 | return DayTimeType::Night; |
| 236 | if (timeUtc > nextSunset.second) |
| 237 | return DayTimeType::Night; |
| 238 | return DayTimeType::Day; |
| 239 | } |
| 240 | |
| 241 | return DayTimeType::Day; |
| 242 | } |
| 243 | |
| 244 | std::string DebugPrint(DayTimeType type) |
| 245 | { |