Implement deg_to_cardinal()

2 files changed, 40 insertions, 0 deletions

diff --git a/iss/tests/test_utils.py b/iss/tests/test_utils.py
new file mode 100644
index 0000000..4c67322
--- /dev/null
+++ b/iss/tests/test_utils.py
@@ -0,0 +1,18 @@
+from ..utils import deg_to_cardinal
+
+
+def test_deg_to_cardinal():
+    cases = [
+        (0, "N"),
+        (360, "N"),
+        (90, "E"),
+        (91.1, "E"),
+        (78, "ENE"),
+        (182, "S"),
+        (255, "WSW"),
+        (324.99999, "NW"),
+        (345, "NNW"),
+        (350, "N"),
+    ]
+    for deg, cardinal in cases:
+        assert deg_to_cardinal(deg) == cardinal
diff --git a/iss/utils.py b/iss/utils.py
index f1a75c0..0bf9d04 100644
--- a/iss/utils.py
+++ b/iss/utils.py
@@ -1,3 +1,25 @@
 def chunks(l, n):
     for i in range(0, len(l), n):
         yield l[i : i + n]
+
+
+def deg_to_cardinal(deg):
+    cardinals = [
+        "N",
+        "NNE",
+        "NE",
+        "ENE",
+        "E",
+        "ESE",
+        "SE",
+        "SSE",
+        "S",
+        "SSW",
+        "SW",
+        "WSW",
+        "W",
+        "WNW",
+        "NW",
+        "NNW",
+    ]
+    return cardinals[round((deg % 360) / 22.5) % 16]