From f557704a522f412ae9273e279a96de765825143c Mon Sep 17 00:00:00 2001
From: Zeno Rogue <zeno@attnam.com>
Date: Fri, 17 Apr 2026 00:35:15 +0200
Subject: [PATCH] SAG/embedded edge fixes

---
 rogueviz/embeddings/embeddings.cpp | 12 ++++++++++--
 rogueviz/sag/sag.cpp               |  5 +++--
 2 files changed, 13 insertions(+), 4 deletions(-)

diff --git a/rogueviz/embeddings/embeddings.cpp b/rogueviz/embeddings/embeddings.cpp
index 72fc6a69..16058c0c 100644
--- a/rogueviz/embeddings/embeddings.cpp
+++ b/rogueviz/embeddings/embeddings.cpp
@@ -11,6 +11,11 @@ vector<vector<int> > directed_edges;
 
 rogueviz::edgetype *any;
 
+edgetype *ensure_edge() {
+  if(!any) any = add_edgetype("embedded edge");
+  return any;
+  }
+
 struct rv_embedding : public tiled_embedding {
   virtual string name() override { return "RogueViz internal representation"; }
   pair<cell*, hyperpoint> as_location(int id) override {
@@ -27,7 +32,7 @@ void read_edgelist(const string& fname) {
     current = nullptr;
     });
 
-  any = rogueviz::add_edgetype("embedded edges");
+  ensure_edge();
   indenter_finish ind(true, "Reading edgelist...");
 
   fhstream f(fname, "rt");
@@ -117,7 +122,10 @@ int a = arg::add3("-edgelist", [] { arg::shift(); read_edgelist(arg::args()); })
   + arg::add3("-esaveas", [] { arg::shift(); esave(arg::args()); })
   + arg::add3("-missing-edges", [] { arg::shift(); set_missing_edges(arg::argf()); })
   + arg::add3("-missing-edges-env", [] { auto env = std::getenv("MISSING_EDGES"); if(env) set_missing_edges(atof(env)); })
-  + arg::add3("-el-rv", [] { if(rogueviz::rv_quality == 0) force_rvgraph(); current = std::make_shared<rv_embedding> (); });
+  + arg::add3("-el-rv", [] { if(rogueviz::rv_quality == 0) force_rvgraph(); current = std::make_shared<rv_embedding> (); })
+  + arg::add3("-edge-arrow", [] {
+    arg::shift(); any->arrow_scale = arg::argf();
+    });
 
 }
 
diff --git a/rogueviz/sag/sag.cpp b/rogueviz/sag/sag.cpp
index 2db2dc3e..00be0fb8 100644
--- a/rogueviz/sag/sag.cpp
+++ b/rogueviz/sag/sag.cpp
@@ -322,7 +322,9 @@ int readArgs() {
   else if(argis("-sag-unoptimize")) {
     unoptimize();
     }
-
+  else if(argis("-sag-edge-arrow")) {
+    shift(); ensure_sag_edge()->arrow_scale = arg::argf();
+    }
   else return 1;
 #endif
   return 0;
@@ -356,7 +358,6 @@ void clear() {
   cell_matrix.clear();
   cellpoint.clear();
   sagdist.clear();
-  sag_edge = nullptr;
   state = 0;
   qon.clear(); qsf.clear();
   }