diff --git a/mustergenerator.py b/mustergenerator.py
index 978a9d6..d80223f 100644
--- a/mustergenerator.py
+++ b/mustergenerator.py
@@ -8,6 +8,7 @@ class Circle:
         assert length >= 0, "length can not be negative"
         assert height >= 0, "height can not be negative"
         assert radius >= 0, "radius can not be negative"
+        assert radius <= distance / 2, "radius must be smaller then half the distance"
         assert distance >= 2*radius, "distance must be grater then two times the radius"
         assert offset_percentage >= 0, "offset can only be 0 - 100 %"
         assert offset_percentage <= 100, "offset can only be 0 - 100 %"
@@ -46,6 +47,7 @@ class Circle:
     @radius.setter
     def radius(self, val):
         assert val >= 0, "radius can not be negative"
+        assert radius <= self.__distance / 2, "radius must be smaller then half the distance"
         self.__radius = val
 
     @property
@@ -56,6 +58,7 @@ class Circle:
     def distance(self, val):
         assert val >= 2 * self.__radius, "distance must be grater then two times the radius"
         self.__distance = val
+        self.__offset = (val / 100) * self.__offset_percentage
 
     @property
     def offset_percentage(self):
@@ -73,7 +76,7 @@ class Circle:
         x = self.__radius
         y = self.__radius
         i = 1
-        dictance_y = (math.sqrt(3) / 2) * self.__distance
+        distance_y = (math.sqrt(3) / 2) * self.__distance
 
         canvas = draw.Drawing(self.__length, self.__height, origin=(0, 0))
 
@@ -90,13 +93,13 @@ class Circle:
             else:
                 x = self.__radius + self.__offset
 
-            y = y + dictance_y
+            y = y + distance_y
             i = i + 1
 
         if generate_shifted_pattern:
             i = 1
             x_shifted = self.__radius + self.__distance / 2
-            y_shifted = self.__radius + dictance_y / (2 * math.sqrt(3))
+            y_shifted = self.__radius + distance_y / (2 * math.sqrt(3))
 
             canvas_shifted = draw.Drawing(self.__length, self.__height, origin=(0, 0))
 
@@ -111,7 +114,7 @@ class Circle:
                     x_shifted = self.__radius + self.__distance / 2
                 else:
                     x_shifted = self.__radius + self.__distance / 2 + self.__offset
-                y_shifted = y_shifted + dictance_y
+                y_shifted = y_shifted + distance_y
                 i = i + 1
 
             if filetype == 'svg':