diff --git a/src/autorouter/autorouter.rs b/src/autorouter/autorouter.rs
index e14acbd..e69ecd8 100644
--- a/src/autorouter/autorouter.rs
+++ b/src/autorouter/autorouter.rs
@@ -183,7 +183,7 @@ impl<R: RulesTrait> Autorouter<R> {
             .trianvertex_index()
         {
             RatvertexIndex::FixedDot(dot) => dot,
-            RatvertexIndex::Zone(zone) => self.board.layout_mut().zone_apex(zone),
+            RatvertexIndex::Zone(zone) => self.board.zone_apex(zone),
         };
 
         let target_dot = match self
@@ -194,7 +194,7 @@ impl<R: RulesTrait> Autorouter<R> {
             .trianvertex_index()
         {
             RatvertexIndex::FixedDot(dot) => dot,
-            RatvertexIndex::Zone(zone) => self.board.layout_mut().zone_apex(zone),
+            RatvertexIndex::Zone(zone) => self.board.zone_apex(zone),
         };
 
         (source_dot, target_dot)
diff --git a/src/autorouter/board.rs b/src/autorouter/board.rs
index f2f8d33..f60ee49 100644
--- a/src/autorouter/board.rs
+++ b/src/autorouter/board.rs
@@ -3,14 +3,18 @@ use std::collections::HashMap;
 use crate::{
     drawing::{
         dot::{FixedDotIndex, FixedDotWeight},
-        graph::PrimitiveIndex,
+        graph::{GetLayer, GetMaybeNet, PrimitiveIndex},
         rules::RulesTrait,
         seg::{FixedSegIndex, FixedSegWeight},
         Infringement,
     },
-    geometry::GenericNode,
+    geometry::{shape::ShapeTrait, GenericNode},
     graph::GenericIndex,
-    layout::{zone::ZoneWeight, Layout},
+    layout::{
+        zone::{GetMaybeApex, MakePolyShape, ZoneWeight},
+        Layout,
+    },
+    math::Circle,
 };
 
 pub type NodeIndex = GenericNode<PrimitiveIndex, GenericIndex<ZoneWeight>>;
@@ -114,6 +118,25 @@ impl<R: RulesTrait> Board<R> {
         self.net_to_netname.insert(net, netname);
     }
 
+    pub fn zone_apex(&mut self, zone: GenericIndex<ZoneWeight>) -> FixedDotIndex {
+        if let Some(apex) = self.layout.zone(zone).maybe_apex() {
+            apex
+        } else {
+            self.add_zone_fixed_dot(
+                FixedDotWeight {
+                    circle: Circle {
+                        pos: self.layout.zone(zone).shape().center(),
+                        r: 100.0,
+                    },
+                    layer: self.layout.zone(zone).layer(),
+                    maybe_net: self.layout.zone(zone).maybe_net(),
+                },
+                zone,
+            )
+            .unwrap()
+        }
+    }
+
     pub fn node_pin(&self, node: NodeIndex) -> Option<&String> {
         self.node_to_pin.get(&node)
     }
diff --git a/src/layout/layout.rs b/src/layout/layout.rs
index c51ab5d..6a266e0 100644
--- a/src/layout/layout.rs
+++ b/src/layout/layout.rs
@@ -180,25 +180,6 @@ impl<R: RulesTrait> Layout<R> {
             .compound_members(GenericIndex::new(zone.node_index()))
     }
 
-    pub fn zone_apex(&mut self, zone: GenericIndex<ZoneWeight>) -> FixedDotIndex {
-        if let Some(apex) = self.zone(zone).maybe_apex() {
-            apex
-        } else {
-            self.add_zone_fixed_dot(
-                FixedDotWeight {
-                    circle: Circle {
-                        pos: self.zone(zone).shape().center(),
-                        r: 100.0,
-                    },
-                    layer: self.zone(zone).layer(),
-                    maybe_net: self.zone(zone).maybe_net(),
-                },
-                zone,
-            )
-            .unwrap()
-        }
-    }
-
     pub fn drawing(&self) -> &Drawing<ZoneWeight, R> {
         &self.drawing
     }