improve collision code

1 files changed, 4 insertions, 0 deletions

diff --git a/util.lua b/util.lua
index a639ca2..24b4214 100644
--- a/util.lua
+++ b/util.lua
@@ -27,4 +27,8 @@ function M.deepcopy(t)
 	return dc(t)
 end
 
+function M.rot(a, x, y)
+	return x*math.cos(a) - y*math.sin(a), x*math.sin(a) + y*math.cos(a)
+end
+
 return M