add a function that generate filled gerberdata with representing internal shape by fliping polarity

1 files changed, 8 insertions, 1 deletions

diff --git a/gerberex/utility.py b/gerberex/utility.py
index 4c89fa6..37de5e8 100644
--- a/gerberex/utility.py
+++ b/gerberex/utility.py
@@ -3,7 +3,7 @@
 
 # Copyright 2019 Hiroshi Murayama <opiopan@gmail.com>
 
-from math import cos, sin, pi
+from math import cos, sin, pi, sqrt
 
 def rotate(x, y, angle, center):
     x0 = x - center[0]
@@ -18,3 +18,10 @@ def is_equal_value(a, b, error_range=0):
 def is_equal_point(a, b, error_range=0):
     return is_equal_value(a[0], b[0], error_range) and \
         is_equal_value(a[1], b[1], error_range)
+
+def normalize_vec2d(vec):
+    length = sqrt(vec[0] * vec[0] + vec[1] * vec[1])
+    return (vec[0] / length, vec[1] / length)
+
+def dot_vec2d(vec1, vec2):
+    return vec1[0] * vec2[0] + vec1[1] * vec2[1]
\ No newline at end of file