diff --git a/src/bin/topola-egui/painter.rs b/src/bin/topola-egui/painter.rs
index 2a13563..30ec427 100644
--- a/src/bin/topola-egui/painter.rs
+++ b/src/bin/topola-egui/painter.rs
@@ -1,4 +1,5 @@
 use geo::{CoordsIter, Point, Polygon};
+use rstar::AABB;
 use topola::{
     geometry::primitive::{AccessPrimitiveShape, PrimitiveShape},
     math::{self, Circle},
@@ -59,19 +60,22 @@ impl<'a> Painter<'a> {
         self.ui.painter().add(epaint_shape);
 
         if self.paint_bboxes {
-            let bbox = AccessPrimitiveShape::bbox(shape, 0.0);
-            let rect = egui::epaint::Rect {
-                min: [bbox.lower()[0] as f32, -bbox.upper()[1] as f32].into(),
-                max: [bbox.upper()[0] as f32, -bbox.lower()[1] as f32].into(),
-            };
-            self.ui.painter().add(egui::Shape::rect_stroke(
-                self.transform.mul_rect(rect),
-                egui::Rounding::ZERO,
-                egui::Stroke::new(1.0, egui::Color32::GRAY),
-            ));
+            self.paint_bbox(AccessPrimitiveShape::bbox(shape, 0.0));
         }
     }
 
+    pub fn paint_bbox(&mut self, bbox: AABB<[f64; 2]>) {
+        let rect = egui::epaint::Rect {
+            min: [bbox.lower()[0] as f32, -bbox.upper()[1] as f32].into(),
+            max: [bbox.upper()[0] as f32, -bbox.lower()[1] as f32].into(),
+        };
+        self.ui.painter().add(egui::Shape::rect_stroke(
+            self.transform * rect,
+            egui::Rounding::ZERO,
+            egui::Stroke::new(1.0, egui::Color32::GRAY),
+        ));
+    }
+
     pub fn paint_dot(&mut self, circle: Circle, color: egui::epaint::Color32) {
         let shape = self.dot_shape(circle, color);
         self.ui.painter().add(shape);
diff --git a/src/bin/topola-egui/viewport.rs b/src/bin/topola-egui/viewport.rs
index e1b9b5c..fa0b704 100644
--- a/src/bin/topola-egui/viewport.rs
+++ b/src/bin/topola-egui/viewport.rs
@@ -3,6 +3,7 @@ use petgraph::{
     data::DataMap,
     visit::{EdgeRef, IntoEdgeReferences},
 };
+use rstar::AABB;
 use topola::{
     autorouter::invoker::{
         Command, ExecuteWithStatus, GetGhosts, GetMaybeNavmesh, GetMaybeTrace, GetObstacles,
@@ -209,6 +210,13 @@ impl Viewport {
                             }
                         }
 
+                        if top.show_bboxes {
+                            let root_bbox3d = board.layout().drawing().rtree().root().envelope();
+
+                            let root_bbox = AABB::<[f64; 2]>::from_corners([root_bbox3d.lower()[0], root_bbox3d.lower()[1]].into(), [root_bbox3d.upper()[0], root_bbox3d.upper()[1]].into());
+                            painter.paint_bbox(root_bbox);
+                        }
+
                         if let Some(execute) = maybe_execute {
                             for ghost in execute.ghosts().iter() {
                                 painter.paint_primitive(&ghost, egui::Color32::from_rgb(75, 75, 150));