Angle difference between two bearings: Difference between revisions

Content added Content deleted

Inline

@@ Line 3,828: / Line 3,828: @@
 -161.50295230785
 .2988555882</pre>
+=={{header|Vlang}}==
+{{trans|go}}
+<lang vlang>import math
+type Bearing = f64
+const test_cases = [
+    [Bearing(20), 45],
+    [Bearing(-45), 45],
+    [Bearing(-85), 90],
+    [Bearing(-95), 90],
+    [Bearing(-45), 125],
+    [Bearing(-45), 145],
+    [Bearing(29.4803), -88.6381],
+    [Bearing(-78.3251), -159.036],
+]
+fn main() {
+    for tc in test_cases {
+        println(tc[1].sub(tc[0]))
+        println(angle_difference(tc[1],tc[0]))
+    }
+}
+fn (b2 Bearing) sub(b1 Bearing) Bearing {
+    d := b2 - b1
+    match true {
+        d < -180 {
+            return d + 360
+        }
+        d > 180 {
+            return d - 360
+        }
+        else {
+            return d
+        }
+    }
+}
+fn angle_difference(b2 Bearing, b1 Bearing) Bearing {
+    return math.mod(math.mod(b2-b1, 360)+360+180, 360) - 180
+}</lang>
+{{out}}
+<pre>
+.
+.
+.
+.
+-175.
+-175.
+-170
+-170
+-118.1184
+-118.11840000000001
+-80.7109
+-80.71089999999998
+</pre>
 =={{header|Wren}}==