extracting Direction

kgeri · Dec 22, 2022 · d3e44d7 · d3e44d7
1 parent 01af59f
commit d3e44d7
Show file tree

Hide file tree

Showing 2 changed files with 17 additions and 2 deletions.
diff --git a/src/main/kotlin/me/gergo/Aoc09.kt b/src/main/kotlin/me/gergo/Aoc09.kt
@@ -18,7 +18,6 @@ fun main() {
     println("Positions visited by tail: ${ropeField.positionsVisitedByTail().count()}")
 }
 
-private enum class Direction { L, R, U, D }
 private data class RopeStep(val dir: Direction, val steps: Int)
 private data class Position(val x: Int, val y: Int) {
     fun distanceFrom(o: Position) = max(abs(x - o.x), abs(y - o.y))

diff --git a/src/main/kotlin/me/gergo/coordinates.kt b/src/main/kotlin/me/gergo/coordinates.kt
@@ -1,6 +1,22 @@
 package me.gergo
 
-import kotlin.math.abs
+enum class Direction {
+    L, U, R, D;
+
+    fun clockWise() = when (this) {
+        L -> U
+        U -> R
+        R -> D
+        D -> L
+    }
+
+    fun counterClockWise() = when (this) {
+        L -> D
+        U -> L
+        R -> U
+        D -> R
+    }
+}
 
 data class Coordinate(val x: Int, val y: Int)