From 18abde5b4c3ac1184653e5fa86cc92757de45195 Mon Sep 17 00:00:00 2001
From: Zeno Rogue <zeno@attnam.com>
Date: Sun, 6 Sep 2026 15:51:42 +0200
Subject: [PATCH] rogueviz:: embeddings:: node importance/rendered,
 bhyper-reduced representation

---
 rogueviz/embeddings/coords.cpp     | 15 ++++++++++++--
 rogueviz/embeddings/embeddings.cpp | 32 +++++++++++++++++++++++++++++-
 rogueviz/embeddings/embeddings.h   |  7 +++++++
 3 files changed, 51 insertions(+), 3 deletions(-)

diff --git a/rogueviz/embeddings/coords.cpp b/rogueviz/embeddings/coords.cpp
index a0017f39..c644fa9b 100644
--- a/rogueviz/embeddings/coords.cpp
+++ b/rogueviz/embeddings/coords.cpp
@@ -3,9 +3,9 @@ namespace rogueviz {
 
 namespace embeddings {
 
-  enum class fmt { hyperb, poincare, bhyper };
+  enum class fmt { hyperb, poincare, bhyper, bhyper_reduced };
   
-  string format_names[3] = { "hyperboloid trailing", "Poincare", "hyperboloid leading" };
+  string format_names[4] = { "hyperboloid trailing", "Poincare", "hyperboloid leading", "hyperboloid leading reduced" };
 
   fmt coord_format;
 
@@ -36,6 +36,8 @@ namespace embeddings {
             println(f, format("%.20lf", co[MDIM-1]));
             for(int i=0; i<MDIM-1; i++) println(f, format("%.20lf", co[i]));
             break;
+          case fmt::bhyper_reduced:
+            throw hr_exception("cannot save reduced embedding format");
           case fmt::poincare:
             auto h1 = space_to_perspective(co, 1);
             for(int i=0; i<MDIM-1; i++) println(f, format("%.20lf", h1[i]));
@@ -64,6 +66,8 @@ namespace embeddings {
     fhstream f(fn, "rt");
     if(!f.f) return file_error(fn);
 
+    if(coord_format == fmt::bhyper_reduced) node_importance.resize(N);
+
     for(int i=0; i<N; i++) {
       string s = scan<string>(f);
       if(s == "") throw hr_exception("data failure");
@@ -77,6 +81,12 @@ namespace embeddings {
           co[MDIM-1] = scan<ld>(f);
           for(int i=0; i<MDIM-1; i++) co[i] = scan<ld>(f);
           break;
+        case fmt::bhyper_reduced:
+          scan<ld>(f);
+          for(int i=0; i<3; i++) co[i] = scan<ld>(f);
+          node_importance[id] = hypot_d(3, co);
+          co = normalize(co);
+          break;
         case fmt::poincare:
           hyperpoint h1;
           for(int i=0; i<MDIM-1; i++) h1[i] = scan<ld>(f);
@@ -92,6 +102,7 @@ namespace embeddings {
     arg::add3("-el-coord", [] { arg::shift(); read_coord(arg::args()); })
   + arg::add3("-ec-hyperb", [] { coord_format = fmt::hyperb; })
   + arg::add3("-ec-bhyper", [] { coord_format = fmt::bhyper; })
+  + arg::add3("-ec-bhyper-reduced", [] { coord_format = fmt::bhyper_reduced; })
   + arg::add3("-ec-poincare", [] { coord_format = fmt::poincare; });
   
   }
diff --git a/rogueviz/embeddings/embeddings.cpp b/rogueviz/embeddings/embeddings.cpp
index f739f7fc..def2649b 100644
--- a/rogueviz/embeddings/embeddings.cpp
+++ b/rogueviz/embeddings/embeddings.cpp
@@ -22,6 +22,8 @@ edgetype *ensure_edge() {
   return any;
   }
 
+vector<ld> importance;
+
 struct rv_embedding : public tiled_embedding {
   virtual string name() override { return "RogueViz internal representation"; }
   pair<cell*, hyperpoint> as_location(int id) override {
@@ -46,6 +48,7 @@ void read_edgelist(const string& fname) {
   rv_hook(hooks_clearmemory, 100, [] {
     directed_edges.clear();
     current = nullptr;
+    any = nullptr;
     });
 
   ensure_edge();
@@ -97,12 +100,38 @@ void write_edgelist(const string &fname) {
 void force_rvgraph() {
   for(auto& v: vdata) if(v.id < get_n()) {
     auto p = current->as_location(v.id);
-    v.be(p.first, rgpushxto0(p.second));
+    if(get_node_rendered(v.id))
+      v.be(p.first, rgpushxto0(p.second));
+    else
+      v.be_nowhere();
+    }
+  }
+
+vector<ld> node_importance;
+vector<bool> node_rendered;
+ld render_radius;
+
+void recompute_rendered() {
+  if(render_radius > 0) {
+    int N = get_n();
+    vector<int> order;
+    for(int i=0; i<N; i++) order.push_back(i);
+    sort(order.begin(), order.end(), [] (int i, int j) { return pair(get_node_importance(i), i) < pair(get_node_importance(j), j); });
+    vector<hyperpoint> sofar;
+    node_rendered.resize(N);
+    for(auto i: order) {
+      bool ok = true;
+      auto h1 = current->as_hyperpoint(i);
+      for(auto h0: sofar) if(hdist(h0, h1) < render_radius) { ok = false; break; }
+      node_rendered[i] = ok;
+      if(ok) sofar.push_back(h1);
+      }
     }
   }
 
 void reenable_embedding() {
   eval.current = false;
+  recompute_rendered();
   if(rogueviz::rv_quality >= 1 && among(current->get_dimension(), 2, 3) && current->get_dimension() <= WDIM) force_rvgraph();
   }
 
@@ -141,6 +170,7 @@ int a = arg::add3("-edgelist", [] { arg::shift(); read_edgelist(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("-render-radius", [] { arg::shift_arg_formula(render_radius); })
   + arg::add3("-edge-arrow", [] {
     arg::shift(); any->arrow_scale = arg::argf();
     });
diff --git a/rogueviz/embeddings/embeddings.h b/rogueviz/embeddings/embeddings.h
index aa708f56..984cd976 100644
--- a/rogueviz/embeddings/embeddings.h
+++ b/rogueviz/embeddings/embeddings.h
@@ -112,6 +112,13 @@ extern struct evaltype {
   bool symmetric;
   } eval;
 
+extern vector<ld> node_importance;
+extern vector<bool> node_rendered;
+extern ld render_radius;
+
+inline ld get_node_importance(int i) { if(node_importance.empty()) return 0; else return node_importance[i]; }
+inline ld get_node_rendered(int i) { if(node_rendered.empty()) return true; else return node_rendered[i]; }
+
 void symmetrize();
 
 }