rotate is now a util

1 files changed, 4 insertions, 8 deletions

diff --git a/execs/Day12.hs b/execs/Day12.hs
index 72e0124..11d2aa6 100644
--- a/execs/Day12.hs
+++ b/execs/Day12.hs
@@ -1,5 +1,7 @@
 module Main where
 
+import Utils
+
 parseLine s = (head s, read (tail s) :: Float)
 
 moves ls = sum $ map (round . abs) [fx, fy]
@@ -12,11 +14,7 @@ moves ls = sum $ map (round . abs) [fx, fy]
           fn (x, y, rot) ('L', v) = (x, y, rot + v)
           fn (x, y, rot) ('F', v) = (nx, ny, rot)
               where nx = x + v * cos (pi * rot / 180)
-                    ny = y + v*sin (pi * rot / 180)
-
-rotate (x, y) t = (nx, ny)
-    where nx = x*cos(pi*t/180) - y*sin(pi*t/180)
-          ny = x*sin(pi*t/180) + y*cos(pi*t/180)
+                    ny = y + v * sin (pi * rot / 180)
 
 waypoint (sx, sy) ls = sum $ map (round . abs) [fx, fy]
     where (fx, fy, _, _) = foldl fn (0.0, 0.0, sx, sy) ls
@@ -25,13 +23,11 @@ waypoint (sx, sy) ls = sum $ map (round . abs) [fx, fy]
           fn (x, y, wx, wy) ('W', v) = (x, y, wx-v, wy)
           fn (x, y, wx, wy) ('S', v) = (x, y, wx, wy-v)
           fn (x, y, wx, wy) ('R', v) = (x, y, nwx, nwy)
-              where p = negate v
-                    (nwx, nwy) = rotate (wx, wy) p
+              where (nwx, nwy) = rotate (wx, wy) (negate v)
           fn (x, y, wx, wy) ('L', v) = (x, y, nwx, nwy)
               where (nwx, nwy) = rotate (wx, wy) v
           fn (x, y, wx, wy) ('F', v) = (x+v*wx, y+v*wy, wx, wy)
 
-
 main :: IO ()
 main = do
     n <- map parseLine . lines <$> readFile "input/12"