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authorMattias Andrée <maandree@member.fsf.org>2016-01-02 23:32:37 +0100
committerMattias Andrée <maandree@member.fsf.org>2016-01-02 23:32:37 +0100
commitb186aea4cb579f9c3d6ba33e06c6d26d8699a06a (patch)
tree52b18c9d117d0721b5f6eec39e23e4c56835587e
parentm (diff)
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get_darkness
Signed-off-by: Mattias Andrée <maandree@member.fsf.org>
-rw-r--r--src/state.c42
-rw-r--r--src/state.h70
2 files changed, 112 insertions, 0 deletions
diff --git a/src/state.c b/src/state.c
new file mode 100644
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+++ b/src/state.c
@@ -0,0 +1,42 @@
+/**
+ * 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;
+}
+
diff --git a/src/state.h b/src/state.h
new file mode 100644
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--- /dev/null
+++ b/src/state.h
@@ -0,0 +1,70 @@
+/**
+ * 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.
+ */
+
+
+
+/**
+ * The times of the day, by degree of darkness.
+ */
+enum darkness {
+ /**
+ * Not calculated yet.
+ */
+ UNKNOWN = -1,
+
+ /**
+ * Hopefully, it is bright outside.
+ */
+ DAYTIME = 0,
+
+ /**
+ * The sky is golden. The golden "hour".
+ * Also known as BMCT (dawn) or EECT (dusk).
+ */
+ CIVIL_TWILIGHT = 1,
+
+ /**
+ * The sky is pink and blue.
+ */
+ NAUTICAL_TWILIGHT = 2,
+
+ /**
+ * The sky is medium dark blue.
+ */
+ ASTRONOMICAL_TWILIGHT = 3,
+
+ /**
+ * The sky is reallu dark blue.
+ */
+ NIGHT = 4
+};
+
+
+
+/**
+ * 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);
+