1 files changed, 9 insertions, 0 deletions
diff --git a/src/Physics.elm b/src/Physics.elm
index 2d2d627..c68ab58 100644
--- a/src/Physics.elm
+++ b/src/Physics.elm
@@ -22,6 +22,15 @@ getMove speed dir =
           , y = speed * sin angle
           }
 
+getWaveMove : Float -> Vec2 -> Float -> Float -> Vec2
+getWaveMove speed dir amplitude period =
+  let move = getMove speed dir
+      perpendMove =
+        getMove
+          (amplitude * (sin ((norm move) / period)))
+          (clockwiseRotate90 move)
+  in  move `add` perpendMove
+
 getAcc : Vec2 -> Vec2 -> Vec2
 getAcc move speed = (move `div` 300) `sub` (speed `div` 300)