From 8235c66c7e864afb9103b1361e82401445924375 Mon Sep 17 00:00:00 2001
From: Mikolaj Wielgus <wielgusmikolaj@gmail.com>
Date: Wed, 8 Oct 2025 02:18:56 +0200
Subject: [PATCH] fix(autorouter/anterouter): Correctly calculate fanout
 lengths

---
 crates/topola-egui/src/menu_bar.rs |  2 +-
 src/autorouter/anterouter.rs       | 27 +++++++++------------------
 2 files changed, 10 insertions(+), 19 deletions(-)

diff --git a/crates/topola-egui/src/menu_bar.rs b/crates/topola-egui/src/menu_bar.rs
index 2c89ce7..59081dc 100644
--- a/crates/topola-egui/src/menu_bar.rs
+++ b/crates/topola-egui/src/menu_bar.rs
@@ -48,7 +48,7 @@ impl MenuBar {
         Self {
             multilayer_autorouter_options: MultilayerAutorouterOptions {
                 anterouter: AnterouterOptions {
-                    fanout_clearance: 100.0,
+                    fanout_clearance: 200.0,
                 },
                 planar: AutorouterOptions {
                     presort_by: PresortBy::RatlineIntersectionCountAndLength,
diff --git a/src/autorouter/anterouter.rs b/src/autorouter/anterouter.rs
index 2274543..c05a697 100644
--- a/src/autorouter/anterouter.rs
+++ b/src/autorouter/anterouter.rs
@@ -348,6 +348,7 @@ impl Anterouter {
             .drawing()
             .primitive(source_dot)
             .maybe_net();
+        let bbox_center = point! {x: bbox.center()[0], y: bbox.center()[1]};
         let center = autorouter
             .board()
             .layout()
@@ -357,22 +358,19 @@ impl Anterouter {
             .center();
 
         let cardinal_direction_vector = Point::from(cardinal_direction);
-        /*bbox_to_anchor *= 1.0
-        + dbg!(
-            options.fanout_outer_length
-                / Euclidean::distance(bbox_to_anchor, point! {x: 0.0, y: 0.0})
-        );*/
+
         let bbox_anchor = point! {
             x: (bbox.upper()[0] - bbox.lower()[0]) / 2.0 * cardinal_direction_vector.x(),
             y: (bbox.upper()[1] - bbox.lower()[1]) / 2.0 * cardinal_direction_vector.y(),
         };
+        let bbox_anchor_with_clearance = bbox_anchor
+            * (1.0
+                + options.fanout_clearance
+                    / Euclidean::distance(bbox_anchor, point! {x: 0.0, y: 0.0}));
         let pos = center
-            + bbox_anchor
-                * (1.0
-                    + options.fanout_clearance
-                        / Euclidean::distance(bbox_anchor, point! {x: 0.0, y: 0.0}));
-
-        //let via_bbox_to_anchor = [-pin_bbox_to_anchor[0], -pin_bbox_to_anchor[1]];
+            + cardinal_direction_vector
+                * (bbox_center + bbox_anchor_with_clearance - center)
+                    .dot(cardinal_direction_vector);
 
         let mut board_edit = BoardEdit::new();
 
@@ -407,12 +405,5 @@ impl Anterouter {
         } else {
             Err(())
         }
-        /*let bbox = if let Some(poly) = autorouter.board().layout().drawing().geometry().compounds(dot).find(|(_, compound_weight)| {
-            matches!(compound_weight, CompoundWeight::Poly(..))
-        }) {
-            poly.ref_(autorouter.board().layout()).polygon()
-        } else {
-            //
-        }*/
     }
 }