feat(topola-egui): Display loaded board's boundary

topola-egui/src/app.rs

@@ -8,7 +8,7 @@ use specctra::{error::ParseErrorContext, structure::DsnFile};
 use topola::Board;
 use unic_langid::langid;
 
-use crate::{menu_bar::MenuBar, translator::Translator, workspace::Workspace};
+use crate::{menu_bar::MenuBar, translator::Translator, viewport::Viewport, workspace::Workspace};
 
 pub struct App {
     translator: Translator,
@@ -19,7 +19,7 @@ pub struct App {
     ),
 
     menu_bar: MenuBar,
-    view_rect: egui::Rect,
+    viewport: Viewport,
     workspace: Option<Workspace>,
 }
 
@@ -29,10 +29,7 @@ impl Default for App {
             translator: Translator::new(langid!("en-US")),
             content_channel: channel(),
             menu_bar: MenuBar::new(),
-            view_rect: egui::Rect::from_min_max(
-                egui::pos2(-100.0, 100.0),
-                egui::pos2(100.0, 100.0),
-            ),
+            viewport: Viewport::new(),
             workspace: None,
         }
     }
@@ -130,14 +127,7 @@ impl eframe::App for App {
 
         self.update_state();
 
-        egui::CentralPanel::default().show(ctx, |ui| {
-            egui::Scene::new()
-                .zoom_range(0.001..=1000.0)
-                .show(ui, &mut self.view_rect, |ui| {
-                    ui.painter()
-                        .circle_filled(egui::pos2(0.0, 0.0), 20.0, egui::Color32::RED);
-                });
-        });
+        self.viewport.update(ctx, self.workspace.as_mut());
 
         self.update_locale();
         self.update_title(ctx);

topola-egui/src/displayer.rs

@@ -0,0 +1,58 @@
+// SPDX-FileCopyrightText: 2026 Topola contributors
+//
+// SPDX-License-Identifier: MIT OR Apache-2.0
+
+use egui::Pos2;
+
+use crate::{menu_bar::MenuBar, workspace::Workspace};
+
+pub struct Displayer {}
+
+impl Displayer {
+    pub fn new() -> Self {
+        Self {}
+    }
+
+    pub fn update(
+        &mut self,
+        ctx: &egui::Context,
+        ui: &egui::Ui,
+        //menu_bar: &MenuBar,
+        workspace: &Workspace,
+    ) {
+        self.display_layout(ctx, ui, /*menu_bar,*/ workspace);
+    }
+
+    pub fn display_layout(
+        &mut self,
+        ctx: &egui::Context,
+        ui: &egui::Ui,
+        //menu_bar: &MenuBar,
+        workspace: &Workspace,
+    ) {
+        ui.painter().line(
+            workspace
+                .board
+                .layout()
+                .boundary()
+                .iter()
+                .map(|p| egui::Pos2 {
+                    x: p[0] as f32,
+                    y: p[1] as f32,
+                })
+                .collect::<Vec<_>>(),
+            egui::Stroke::new(500.0, egui::Color32::WHITE),
+        );
+        ui.painter().line(
+            vec![
+                Pos2::new(0.0, 0.0),
+                Pos2::new(100.0, 100.0),
+                Pos2::new(100.0, 500.0),
+            ],
+            egui::Stroke::new(2.0, egui::Color32::GOLD),
+        );
+        ui.painter()
+            .circle_filled(egui::pos2(0.0, 0.0), 2.0, egui::Color32::RED);
+        //workspace.board.layout().boundary()
+    }
+}

topola-egui/src/main.rs

@@ -7,9 +7,12 @@
 mod action;
 mod actions;
 mod app;
+mod displayer;
 mod menu_bar;
 mod translator;
+mod viewport;
 mod workspace;
+
 use crate::app::App;
 
 // When compiling natively:

topola-egui/src/viewport.rs

@@ -0,0 +1,33 @@
+// SPDX-FileCopyrightText: 2026 Topola contributors
+//
+// SPDX-License-Identifier: MIT OR Apache-2.0
+
+use crate::{displayer::Displayer, workspace::Workspace};
+
+pub struct Viewport {
+    pub view_rect: egui::Rect,
+}
+
+impl Viewport {
+    pub fn new() -> Self {
+        Self {
+            view_rect: egui::Rect::from_min_max(
+                egui::pos2(-10000.0, 10000.0),
+                egui::pos2(-10000.0, 10000.0),
+            ),
+        }
+    }
+
+    pub fn update(&mut self, ctx: &egui::Context, workspace: Option<&mut Workspace>) {
+        egui::CentralPanel::default().show(ctx, |ui| {
+            egui::Scene::new()
+                .zoom_range(0.0001..=10000.0)
+                .show(ui, &mut self.view_rect, |ui| {
+                    if let Some(workspace) = workspace {
+                        let mut displayer = Displayer::new();
+                        displayer.update(ctx, ui, workspace)
+                    }
+                });
+        });
+    }
+}

topola/src/layout.rs

@@ -4,7 +4,7 @@
 
 use std::collections::BTreeMap;
 
-use derive_getters::Dissolve;
+use derive_getters::{Dissolve, Getters};
 use stable_vec::StableVec;
 use undoredo::{ApplyDelta, Delta, FlushDelta, Recorder};
 
@@ -101,7 +101,7 @@ pub struct Via {
     radius: u64,
 }
 
-#[derive(Clone, Debug)]
+#[derive(Clone, Debug, Getters)]
 pub struct Layout {
     boundary: Vec<[i64; 2]>,
     place_boundary: Vec<[i64; 2]>,