feat(autorouter/presorter): Make presorter parametrizable

src/autorouter/permutator.rs

@@ -11,7 +11,7 @@ use crate::{
         autoroute::{AutorouteContinueStatus, AutorouteExecutionStepper},
         invoker::GetDebugOverlayData,
         permuter::{PermuteRatlines, RatlinesPermuter},
-        presorter::{PresortRatlines, SccIntersectionsAndLengthPresorter},
+        presorter::{PresortParams, PresortRatlines, SccIntersectionsAndLengthPresorter},
         ratline::RatlineIndex,
         Autorouter, AutorouterError, AutorouterOptions,
     },
@@ -34,7 +34,14 @@ impl AutorouteExecutionPermutator {
         ratlines: Vec<RatlineIndex>,
         options: AutorouterOptions,
     ) -> Result<Self, AutorouterError> {
-        let presorter = SccIntersectionsAndLengthPresorter::new(autorouter, &ratlines);
+        let presorter = SccIntersectionsAndLengthPresorter::new(
+            autorouter,
+            &ratlines,
+            &PresortParams {
+                intersector_count_weight: 1.0,
+                length_weight: 0.001,
+            },
+        );
         let initially_sorted_ratlines = presorter.presort_ratlines(autorouter, &ratlines);
         /*let permuter = RatlinesPermuter::SccPermutations(SccPermutationsRatlinePermuter::new(
             autorouter, ratlines, presorter, &options,

src/autorouter/presorter.rs

@@ -2,8 +2,6 @@
 //
 // SPDX-License-Identifier: MIT
 
-use std::cmp::Ordering;
-
 use derive_getters::{Dissolve, Getters};
 use enum_dispatch::enum_dispatch;
 use petgraph::algo::tarjan_scc;
@@ -11,6 +9,11 @@ use specctra_core::mesadata::AccessMesadata;
 
 use crate::autorouter::{ratline::RatlineIndex, scc::Scc, Autorouter};
 
+pub struct PresortParams {
+    pub intersector_count_weight: f64,
+    pub length_weight: f64,
+}
+
 #[enum_dispatch]
 pub trait PresortRatlines {
     fn presort_ratlines(
@@ -34,6 +37,7 @@ impl SccIntersectionsAndLengthPresorter {
     pub fn new(
         autorouter: &mut Autorouter<impl AccessMesadata>,
         ratlines: &[RatlineIndex],
+        params: &PresortParams,
     ) -> Self {
         // FIXME: Unnecessary copy.
         let mut filtered_ratsnest = autorouter.ratsnest().graph().clone();
@@ -45,19 +49,16 @@ impl SccIntersectionsAndLengthPresorter {
             .collect();
 
         sccs.sort_unstable_by(|a, b| {
-            let primary_ordering = a.intersector_count().cmp(&b.intersector_count());
-
-            if primary_ordering != Ordering::Equal {
-                primary_ordering
-            } else {
-                let secondary_ordering = a.length().total_cmp(&b.length());
-
-                secondary_ordering
-            }
+            Self::scc_score(params, a).total_cmp(&Self::scc_score(params, b))
         });
 
         Self { sccs }
     }
+
+    fn scc_score(params: &PresortParams, scc: &Scc) -> f64 {
+        params.intersector_count_weight * *scc.intersector_count() as f64
+            + params.length_weight * scc.length()
+    }
 }
 
 impl PresortRatlines for SccIntersectionsAndLengthPresorter {

src/autorouter/scc.rs

@@ -20,8 +20,8 @@ use crate::{
 pub struct Scc {
     node_indices: Vec<NodeIndex<usize>>,
 
-    length: f64,
     intersector_count: usize,
+    length: f64,
 }
 
 impl Scc {