feat(plugin): add rotate method to Rotations

Author: anarchuser

plugin/src/shared/sc/plugin2021/Rotation.kt

@@ -9,4 +9,7 @@ enum class Rotation(val value: Int) {
     RIGHT(1),
     MIRROR(2),
     LEFT(3);
+    
+    fun rotate(rotation: Rotation): Rotation =
+            Rotation.values()[(Rotation.values().size + value + rotation.value) % Rotation.values().size]
 }

plugin/src/test/sc/plugin2021/RotationTest.kt

@@ -0,0 +1,16 @@
+package sc.plugin2021
+
+import io.kotlintest.shouldBe
+import io.kotlintest.specs.StringSpec
+
+class RotationTest: StringSpec ({
+    "Rotations can get rotated" {
+        Rotation.values().forEach {
+            it.rotate(Rotation.NONE) shouldBe it
+            Rotation.NONE.rotate(it) shouldBe it
+            it.rotate(Rotation.RIGHT).rotate(Rotation.LEFT) shouldBe it
+            it.rotate(Rotation.MIRROR).rotate(Rotation.MIRROR) shouldBe it
+            it.rotate(Rotation.LEFT).rotate(Rotation.LEFT) shouldBe it.rotate(Rotation.MIRROR)
+        }
+    }
+})