1 files changed, 13 insertions, 0 deletions
diff --git a/gerberex/utility.py b/gerberex/utility.py
new file mode 100644
index 0000000..852519a
--- /dev/null
+++ b/gerberex/utility.py
@@ -0,0 +1,13 @@
+#!/usr/bin/env python
+# -*- coding: utf-8 -*-
+
+# Copyright 2019 Hiroshi Murayama <opiopan@gmail.com>
+
+from math import cos, sin, pi
+
+def rotate(x, y, angle, center):
+    x0 = x - center[0]
+    y0 = y - center[1]
+    angle = angle * pi / 180.0
+    return (cos(angle) * x0 - sin(angle) * y0 + center[0],
+            sin(angle) * x0 + cos(angle) * y0 + center[1])