Fix variable expression calculation

gerbonara/aperture_macros/expression.py

@@ -167,7 +167,7 @@ class VariableExpression(Expression):
 
     def optimized(self, variable_binding={}):
         if self.number in variable_binding:
-            return ConstantExpression(expr(variable_binding[self.number]).optimized(variable_binding))
+            return expr(variable_binding[self.number]).optimized(variable_binding)
         return self
 
     def __eq__(self, other):

gerbonara/cad/protoboard.py

@@ -715,14 +715,14 @@ def _demo():
     #pattern3 = EmptyProtoArea(copper_fill=True)
     #stack = TwoSideLayout(pattern2, pattern3)
     #pattern2 = PatternProtoArea(2.54, obj=PoweredProto(), margin=1)
-    #pattern3 = PatternProtoArea(2.54, obj=RFGroundProto())
+    pattern = PatternProtoArea(2.54, obj=RFGroundProto())
     #stack = PropLayout([pattern2, pattern3], 'h', [0.5, 0.5])
     #pattern = PropLayout([pattern1, stack], 'h', [0.5, 0.5])
     #pattern = PatternProtoArea(2.54, obj=ManhattanPads(2.54))
     #pattern = PatternProtoArea(2.54*1.5, obj=THTFlowerProto())
     #pattern = PatternProtoArea(2.54, obj=THTPad.circle(0, 0, 0.9, 1.8, paste=False))
     #pattern = PatternProtoArea(2.54, obj=PoweredProto())
-    pattern = PatternProtoArea(2.54, obj=AlioCell(), margin=2)
+    #pattern = PatternProtoArea(2.54, obj=AlioCell(), margin=2)
     pb = ProtoBoard(50, 47, pattern, mounting_hole_dia=3.2, mounting_hole_offset=5)
     #pb = ProtoBoard(10, 10, pattern1)
     print(pb.pretty_svg())