layout,connectivity: add band edges when adding terminating segs

src/connectivity.rs

@@ -45,6 +45,7 @@ impl GetNet for BandWeight {
 
 pub type BandIndex = GenericIndex<BandWeight>;
 
-#[enum_dispatch]
 #[derive(Debug, Clone, Copy)]
-pub enum ConnectivityLabel {}
+pub enum ConnectivityLabel {
+    Band,
+}

src/layout.rs

@@ -10,14 +10,14 @@ use thiserror::Error;
 
 use crate::band::Band;
 use crate::connectivity::{
-    BandIndex, BandWeight, ComponentIndex, ComponentWeight, ConnectivityGraph, ConnectivityWeight,
-    GetNet,
+    BandIndex, BandWeight, ComponentIndex, ComponentWeight, ConnectivityGraph, ConnectivityLabel,
+    ConnectivityWeight, GetNet,
 };
 use crate::geometry::{
     BendWeight, DotIndex, DotWeight, FixedBendIndex, FixedDotIndex, FixedDotWeight, FixedSegIndex,
-    FixedSegWeight, GeometryGraph, GeometryIndex, GeometryLabel, GeometryWeight, LoneLooseSegIndex,
-    LoneLooseSegWeight, LooseBendIndex, LooseBendWeight, LooseDotIndex, LooseDotWeight,
-    MakePrimitive, Retag, SegWeight, SeqLooseSegIndex, SeqLooseSegWeight,
+    FixedSegWeight, GeometryGraph, GeometryIndex, GeometryLabel, GeometryWeight, GetComponentIndex,
+    LoneLooseSegIndex, LoneLooseSegWeight, LooseBendIndex, LooseBendWeight, LooseDotIndex,
+    LooseDotWeight, MakePrimitive, Retag, SegWeight, SeqLooseSegIndex, SeqLooseSegWeight,
 };
 use crate::graph::{GenericIndex, GetNodeIndex};
 use crate::guide::Guide;
@@ -131,6 +131,8 @@ impl Layout {
         for outer in outers {
             self.update_this_and_outward_bows(outer).unwrap(); // Must never fail.
         }
+
+        self.connectivity.remove_node(band.node_index());
     }
 
     #[debug_ensures(self.geometry.node_count() == old(self.geometry.node_count() - 4))]
@@ -533,7 +535,20 @@ impl Layout {
         to: FixedDotIndex,
         weight: LoneLooseSegWeight,
     ) -> Result<LoneLooseSegIndex, Infringement> {
-        self.add_seg_infringably(from, to, weight, &[])
+        let seg = self.add_seg_infringably(from, to, weight, &[])?;
+
+        self.connectivity.update_edge(
+            self.primitive(from).component().node_index(),
+            weight.band.node_index(),
+            ConnectivityLabel::Band,
+        );
+        self.connectivity.update_edge(
+            weight.band.node_index(),
+            self.primitive(to).component().node_index(),
+            ConnectivityLabel::Band,
+        );
+
+        Ok(seg)
     }
 
     #[debug_ensures(ret.is_ok() -> self.geometry.node_count() == old(self.geometry.node_count() + 1))]
@@ -546,7 +561,17 @@ impl Layout {
         to: LooseDotIndex,
         weight: SeqLooseSegWeight,
     ) -> Result<SeqLooseSegIndex, Infringement> {
-        self.add_seg_infringably(from, to, weight, &[])
+        let seg = self.add_seg_infringably(from, to, weight, &[])?;
+
+        if let DotIndex::Fixed(dot) = from {
+            self.connectivity.update_edge(
+                self.primitive(dot).component().node_index(),
+                weight.band.node_index(),
+                ConnectivityLabel::Band,
+            );
+        }
+
+        Ok(seg)
     }
 
     #[debug_ensures(ret.is_ok() -> self.geometry.node_count() == old(self.geometry.node_count() + 1))]

src/primitive.rs

@@ -4,7 +4,7 @@ use enum_dispatch::enum_dispatch;
 use petgraph::stable_graph::NodeIndex;
 use petgraph::Direction::{Incoming, Outgoing};
 
-use crate::connectivity::{BandIndex, GetNet};
+use crate::connectivity::{BandIndex, ComponentIndex, GetNet};
 use crate::geometry::{
     DotIndex, FixedBendWeight, FixedDotIndex, FixedDotWeight, FixedSegWeight, GeometryIndex,
     GeometryLabel, GeometryWeight, GetBandIndex, GetComponentIndex, GetOffset, GetWidth,
@@ -174,11 +174,17 @@ macro_rules! impl_fixed_primitive {
     ($primitive_struct:ident, $weight_struct:ident) => {
         impl_primitive!($primitive_struct, $weight_struct);
 
+        impl<'a> GetComponentIndex for $primitive_struct<'a> {
+            fn component(&self) -> ComponentIndex {
+                self.weight().component()
+            }
+        }
+
         impl<'a> GetNet for $primitive_struct<'a> {
             fn net(&self) -> i64 {
                 self.layout()
                     .connectivity()
-                    .node_weight(self.weight().component().node_index())
+                    .node_weight(self.component().node_index())
                     .unwrap()
                     .net()
             }