From e3d58e974a07b39922696697f23727c6ae333d04 Mon Sep 17 00:00:00 2001
From: Akshay <nerdy@peppe.rs>
Date: Sat, 12 Dec 2020 19:53:11 +0530
Subject: rotate is now a util

---
 lib/Utils.hs | 4 ++++
 1 file changed, 4 insertions(+)

(limited to 'lib')

diff --git a/lib/Utils.hs b/lib/Utils.hs
index 6358230..56d9c69 100644
--- a/lib/Utils.hs
+++ b/lib/Utils.hs
@@ -52,6 +52,10 @@ shear c (x, y) = (c * x, c * y)
 inside  (p, q) (r, s) (a, b) = bet a (p, r) && bet b (q, s)
 inside' (p, q) (r, s) (a, b) = bet' a (p, r) && bet' b (q, s)
 
+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)
+
 -- [f, f.f, f.f.f, ...]
 repeatF f = f : map (f .) (repeatF f) 
 
-- 
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