feat(autorouter/autorouter): Add presorting by ratline intersection count and length

Sadly, this does not work well for the DE-9 to DE-9 test, but it is a
step forward.

crates/topola-cli/src/main.rs

@@ -11,6 +11,7 @@ use topola::autorouter::invoker::Invoker;
 use topola::autorouter::selection::PinSelection;
 use topola::autorouter::Autorouter;
 use topola::autorouter::AutorouterOptions;
+use topola::autorouter::PresortBy;
 use topola::layout::LayoutEdit;
 use topola::router::RouterOptions;
 use topola::specctra::design::SpecctraDesign;
@@ -38,7 +39,7 @@ fn main() -> Result<(), std::io::Error> {
             Command::Autoroute(
                 PinSelection::new_select_layer(&board, 0),
                 AutorouterOptions {
-                    presort_by_pairwise_detours: false,
+                    presort_by: PresortBy::RatlineIntersectionCountAndLength,
                     router_options: RouterOptions {
                         wrap_around_bands: true,
                         squeeze_through_under_bends: false,

crates/topola-egui/src/actions.rs

@@ -10,7 +10,7 @@ use crate::{
 };
 
 use egui::{Context, Ui};
-use topola::autorouter::AutorouterOptions;
+use topola::autorouter::{AutorouterOptions, PresortBy};
 
 pub struct FileActions {
     pub open_design: Trigger,
@@ -330,10 +330,12 @@ impl RouteActions {
             ui.separator();
 
             ui.menu_button(tr.text("tr-menu-options"), |ui| {
-                ui.checkbox(
-                    &mut autorouter_options.presort_by_pairwise_detours,
-                    tr.text("tr-menu-route-options-presort-by-pairwise-detours"),
-                );
+                egui::ComboBox::from_label(tr.text("tr-menu-route-options-presort-by"))
+                    .selected_text(format!("{:?}", autorouter_options.presort_by))
+                    .show_ui(ui, |ui| {
+                        ui.selectable_value(&mut autorouter_options.presort_by, PresortBy::RatlineIntersectionCountAndLength, tr.text("tr-menu-route-options-presort-by-ratline-intersection-count-and-length"));
+                        ui.selectable_value(&mut autorouter_options.presort_by, PresortBy::PairwiseDetours, tr.text("tr-menu-route-options-presort-by-pairwise-detours"));
+                    });
                 ui.checkbox(
                     &mut autorouter_options
                         .router_options

crates/topola-egui/src/menu_bar.rs

@@ -7,6 +7,7 @@ use std::{collections::BTreeSet, ops::ControlFlow, path::Path, sync::mpsc::Sende
 use topola::{
     autorouter::{
         execution::Command, invoker::InvokerError, selection::Selection, AutorouterOptions,
+        PresortBy,
     },
     board::AccessMesadata,
     interactor::{interaction::InteractionStepper, route_plan::RoutePlan},
@@ -42,7 +43,7 @@ impl MenuBar {
     pub fn new() -> Self {
         Self {
             autorouter_options: AutorouterOptions {
-                presort_by_pairwise_detours: false,
+                presort_by: PresortBy::RatlineIntersectionCountAndLength,
                 router_options: RouterOptions {
                     routed_band_width: 100.0,
                     wrap_around_bands: true,

locales/en-US/main.ftl

@@ -47,7 +47,9 @@ tr-menu-help-online-documentation = Online Documentation
 # Misnamed tag, TODO fix this.
 tr-menu-options = Options
 
-tr-menu-route-options-presort-by-pairwise-detours = Presort by Pairwise Detours
+tr-menu-route-options-presort-by = Presort by
+tr-menu-route-options-presort-by-ratline-intersection-count-and-length = Intersection Count and Length
+tr-menu-route-options-presort-by-pairwise-detours = Pairwise Detours
 
 ## Continuously applied, so use imperfective aspect if possible, e.g. in Polish
 ## it should be "przeciskaj pod taśmami" instead of "przeciśnij pod taśmami".

src/autorouter/autorouter.rs

@@ -12,7 +12,7 @@ use thiserror::Error;
 
 use crate::{
     board::{AccessMesadata, Board},
-    drawing::{band::BandTermsegIndex, dot::FixedDotIndex, Infringement},
+    drawing::{band::BandTermsegIndex, Infringement},
     graph::MakeRef,
     layout::{via::ViaWeight, LayoutEdit},
     router::{navmesh::NavmeshError, ng, thetastar::ThetastarError, RouterOptions},
@@ -31,9 +31,15 @@ use super::{
     selection::{BandSelection, PinSelection},
 };
 
-#[derive(Debug, Clone, Copy, Serialize, Deserialize)]
+#[derive(Clone, Copy, Debug, Deserialize, Eq, PartialEq, Serialize)]
+pub enum PresortBy {
+    RatlineIntersectionCountAndLength,
+    PairwiseDetours,
+}
+
+#[derive(Clone, Copy, Debug, Deserialize, Serialize)]
 pub struct AutorouterOptions {
-    pub presort_by_pairwise_detours: bool,
+    pub presort_by: PresortBy,
     pub router_options: RouterOptions,
 }
 

src/autorouter/invoker.rs

@@ -15,8 +15,8 @@ use thiserror::Error;
 use crate::{
     board::AccessMesadata,
     drawing::graph::PrimitiveIndex,
-    geometry::{edit::ApplyGeometryEdit, primitive::PrimitiveShape},
-    graph::GenericIndex,
+    geometry::{edit::ApplyGeometryEdit, primitive::PrimitiveShape, shape::MeasureLength},
+    graph::{GenericIndex, MakeRef},
     layout::poly::PolyWeight,
     router::{
         navcord::Navcord,
@@ -35,7 +35,7 @@ use super::{
     measure_length::MeasureLengthExecutionStepper,
     place_via::PlaceViaExecutionStepper,
     remove_bands::RemoveBandsExecutionStepper,
-    Autorouter, AutorouterError,
+    Autorouter, AutorouterError, PresortBy,
 };
 
 /// Trait for getting the information to display on the debug overlay,
@@ -169,18 +169,43 @@ impl<M: AccessMesadata + Clone> Invoker<M> {
             Command::Autoroute(selection, options) => {
                 let mut ratlines = self.autorouter.selected_ratlines(selection);
 
-                if options.presort_by_pairwise_detours {
-                    ratlines.sort_unstable_by(|a, b| {
+                match options.presort_by {
+                    PresortBy::RatlineIntersectionCountAndLength => {
+                        ratlines.sort_unstable_by(|a, b| {
+                            let a_intersector_count = a
+                                .ref_(self.autorouter())
+                                .find_intersecting_ratlines()
+                                .count();
+                            let b_intersector_count = b
+                                .ref_(self.autorouter())
+                                .find_intersecting_ratlines()
+                                .count();
+
+                            let primary_ordering = a_intersector_count.cmp(&b_intersector_count);
+
+                            if primary_ordering != Ordering::Equal {
+                                primary_ordering
+                            } else {
+                                let a_length = a.ref_(self.autorouter()).length();
+                                let b_length = b.ref_(self.autorouter()).length();
+                                let secondary_ordering = a_length.total_cmp(&b_length);
+
+                                secondary_ordering
+                            }
+                        })
+                    }
+                    PresortBy::PairwiseDetours => ratlines.sort_unstable_by(|a, b| {
                         let mut compare_detours = self
                             .autorouter
                             .compare_detours_ratlines(*a, *b, *options)
                             .unwrap();
+
                         if let Ok((al, bl)) = compare_detours.finish(&mut self.autorouter) {
                             PartialOrd::partial_cmp(&al, &bl).unwrap()
                         } else {
                             Ordering::Equal
                         }
-                    });
+                    }),
                 }
 
                 ExecutionStepper::Autoroute(self.autorouter.autoroute_ratlines(ratlines, *options)?)

src/autorouter/ratline.rs

@@ -2,7 +2,7 @@
 //
 // SPDX-License-Identifier: MIT OR Apache-2.0
 
-use geo::{Distance, Euclidean};
+use geo::{line_intersection::line_intersection, Distance, Euclidean, Line};
 use petgraph::graph::EdgeIndex;
 use specctra_core::mesadata::AccessMesadata;
 
@@ -73,31 +73,51 @@ impl<'a, M: AccessMesadata> RatlineRef<'a, M> {
 
         (source_dot, target_dot)
     }
-}
 
-impl<'a, M: AccessMesadata> MeasureLength for RatlineRef<'a, M> {
-    fn length(&self) -> f64 {
-        let (ratvertex0, ratvertex1) = self
+    pub fn find_intersecting_ratlines(&self) -> impl Iterator<Item = RatlineIndex> + '_ {
+        let self_line = self.line();
+
+        self.autorouter
+            .ratsnest()
+            .graph()
+            .edge_indices()
+            .filter(move |other| {
+                let other_line = other.ref_(self.autorouter).line();
+
+                line_intersection(self_line, other_line).is_some()
+            })
+    }
+
+    pub fn line(&self) -> Line {
+        let (source, target) = self
             .autorouter
             .ratsnest
             .graph()
             .edge_endpoints(self.index)
             .unwrap();
-        let ratvertex0_pos = self
+        let source_pos = self
             .autorouter
             .ratsnest
             .graph()
-            .node_weight(ratvertex0)
+            .node_weight(source)
             .unwrap()
             .pos;
-        let ratvertex1_pos = self
+        let target_pos = self
             .autorouter
             .ratsnest
             .graph()
-            .node_weight(ratvertex1)
+            .node_weight(target)
             .unwrap()
             .pos;
 
-        Euclidean::distance(&ratvertex0_pos, &ratvertex1_pos)
+        Line::new(source_pos, target_pos)
+    }
+}
+
+impl<'a, M: AccessMesadata> MeasureLength for RatlineRef<'a, M> {
+    fn length(&self) -> f64 {
+        let line = self.line();
+
+        Euclidean::distance(&line.start_point(), &line.end_point())
     }
 }

tests/common/mod.rs

@@ -84,7 +84,7 @@ pub fn assert_navnode_count(
         .iter()
         .find_map(|ratline| {
             let (candidate_origin, candidate_destination) =
-                autorouter.ratline_endpoint_dots(*ratline);
+                ratline.ref_(autorouter).endpoint_dots();
             let candidate_origin_pin = autorouter
                 .board()
                 .node_pinname(&GenericNode::Primitive(candidate_origin.into()))