diff --git a/src/autorouter/autorouter.rs b/src/autorouter/autorouter.rs
index 9719d06..8993279 100644
--- a/src/autorouter/autorouter.rs
+++ b/src/autorouter/autorouter.rs
@@ -115,14 +115,6 @@ impl Autoroute {
         (from_dot, to_dot)
     }
 
-    fn next_navmesh(
-        layout: &Layout<impl RulesTrait>,
-        from: FixedDotIndex,
-        to: FixedDotIndex,
-    ) -> Navmesh {
-        Navmesh::new(layout, from, to).unwrap()
-    }
-
     pub fn navmesh(&self) -> &Navmesh {
         &self.navmesh
     }
diff --git a/src/bin/topola-egui/app.rs b/src/bin/topola-egui/app.rs
index fb75efa..966f8c5 100644
--- a/src/bin/topola-egui/app.rs
+++ b/src/bin/topola-egui/app.rs
@@ -12,6 +12,7 @@ use std::{
 use topola::{
     autorouter::Autorouter,
     drawing::{
+        dot::FixedDotIndex,
         graph::{MakePrimitive, PrimitiveIndex},
         primitive::MakePrimitiveShape,
         rules::RulesTrait,
@@ -38,6 +39,8 @@ use crate::{overlay::Overlay, painter::Painter};
 
 #[derive(Debug, Default)]
 struct SharedData {
+    pub from: Option<FixedDotIndex>,
+    pub to: Option<FixedDotIndex>,
     pub navmesh: Option<Navmesh>,
     pub path: Vec<VertexIndex>,
     pub ghosts: Vec<PrimitiveShape>,
@@ -195,21 +198,28 @@ impl eframe::App for App {
                 if ui.button("Autoroute").clicked() {
                     if let Some(layout_arc_mutex) = &self.layout {
                         let layout = layout_arc_mutex.clone();
-                        let shared_data = self.shared_data.clone();
+                        let shared_data_arc_mutex = self.shared_data.clone();
 
                         execute(async move {
                             let mut autorouter = Autorouter::new(layout).unwrap();
-                            if let Some(mut it) = autorouter.autoroute_iter() {
-                                shared_data.lock().unwrap().navmesh = Some(it.navmesh().clone());
+                            if let Some(mut autoroute) = autorouter.autoroute_iter() {
+                                let from_to = autoroute.from_to(&autorouter);
 
-                                while let Some(()) = it.next(
+                                {
+                                    let mut shared_data = shared_data_arc_mutex.lock().unwrap();
+                                    shared_data.from = Some(from_to.0);
+                                    shared_data.to = Some(from_to.1);
+                                    shared_data.navmesh = Some(autoroute.navmesh().clone());
+                                }
+
+                                while let Some(()) = autoroute.next(
                                     &mut autorouter,
                                     &mut DebugRouterObserver {
-                                        shared_data: shared_data.clone(),
+                                        shared_data: shared_data_arc_mutex.clone(),
                                     },
                                 ) {
-                                    shared_data.lock().unwrap().navmesh =
-                                        Some(it.navmesh().clone());
+                                    shared_data_arc_mutex.lock().unwrap().navmesh =
+                                        Some(autoroute.navmesh().clone());
                                 }
                             }
                         });
@@ -374,6 +384,24 @@ impl eframe::App for App {
                         for ghost in shared_data.ghosts.iter() {
                             painter.paint_primitive(&ghost, egui::Color32::from_rgb(75, 75, 150));
                         }
+
+                        if let (Some(from), Some(to)) = (shared_data.from, shared_data.to) {
+                            painter.paint_dot(
+                                Circle {
+                                    pos: layout.drawing().primitive(from).shape().center(),
+                                    r: 20.0,
+                                },
+                                egui::Color32::from_rgb(255, 255, 100),
+                            );
+                            painter.paint_dot(
+                                Circle {
+                                    pos: layout.drawing().primitive(to).shape().center(),
+                                    r: 20.0,
+                                },
+                                egui::Color32::from_rgb(255, 255, 100),
+                            );
+                        }
+
                         //unreachable!();
                     }
                 }
diff --git a/src/bin/topola-egui/painter.rs b/src/bin/topola-egui/painter.rs
index 92fa44c..5bec59a 100644
--- a/src/bin/topola-egui/painter.rs
+++ b/src/bin/topola-egui/painter.rs
@@ -1,5 +1,8 @@
 use geo::{CoordsIter, Point, Polygon};
-use topola::geometry::primitive::{PrimitiveShape, PrimitiveShapeTrait};
+use topola::{
+    geometry::primitive::{PrimitiveShape, PrimitiveShapeTrait},
+    math::Circle,
+};
 
 pub struct Painter<'a> {
     ui: &'a mut egui::Ui,
@@ -13,12 +16,7 @@ impl<'a> Painter<'a> {
 
     pub fn paint_primitive(&mut self, shape: &PrimitiveShape, color: egui::epaint::Color32) {
         let epaint_shape = match shape {
-            PrimitiveShape::Dot(dot) => egui::Shape::circle_filled(
-                self.transform
-                    .transform_pos([dot.c.pos.x() as f32, -dot.c.pos.y() as f32].into()),
-                dot.c.r as f32 * self.transform.scale().x,
-                color,
-            ),
+            PrimitiveShape::Dot(dot) => self.dot_shape(dot.c, color),
             PrimitiveShape::Seg(seg) => egui::Shape::line_segment(
                 [
                     self.transform
@@ -65,6 +63,20 @@ impl<'a> Painter<'a> {
         ));
     }
 
+    pub fn paint_dot(&mut self, circle: Circle, color: egui::epaint::Color32) {
+        let shape = self.dot_shape(circle, color);
+        self.ui.painter().add(shape);
+    }
+
+    fn dot_shape(&mut self, circle: Circle, color: egui::epaint::Color32) -> egui::Shape {
+        egui::Shape::circle_filled(
+            self.transform
+                .transform_pos([circle.pos.x() as f32, -circle.pos.y() as f32].into()),
+            circle.r as f32 * self.transform.scale().x,
+            color,
+        )
+    }
+
     pub fn paint_polygon(&mut self, polygon: &Polygon, color: egui::epaint::Color32) {
         self.ui.painter().add(egui::Shape::convex_polygon(
             polygon