Broken, don't understand why yet

permute_testbed.js

@@ -621,14 +621,48 @@ function nice_icosa(nodes, icosa) {
 }
 
 
+// New approach with tetrahedral coloring
+
+function find_edges(links, nid) {
+	return links.filter((l) => l.source === nid || l.target === nid );
+}
+
+
+function find_adjacent(links, nid) {
+	return find_edges(links, nid).map((l) => {
+		if( l.source === nid ) {
+			return l.target;
+		} else {
+			return l.source;
+		}
+	});
+}
+
+function iterate_graph(nodes, links, n, fn) {
+	const queue = [];
+	const seen = {};
+	const nodes_id = {};
+	nodes.map((n) => nodes_id[n.id] = n);
+
+	queue.push(n.id);
+	seen[n.id] = true;
+	fn(n);
+
+	while( queue.length > 0 ) {
+		const v = queue.shift();
+		find_adjacent(links, v).map((aid) => {
+			if( !(aid in seen) ) {
+				seen[aid] = true;
+				queue.push(aid);
+				fn(nodes_id[aid]);
+			}
+		})
+	}
+}
+
+
 const nodes = make_120cell_vertices();
-// const chords = find_all_chords(nodes);
-// const chord3 = chords["1.74806"];  // these are edges of the 600-cells;
-
-//const pairs60 = neighbour_angles(chord3, nodes[0], "60.000");
-//const icosas = partition_nodes(pairs60);
-
-make_120_partition(nodes, nodes[0])
 
+const links = auto_detect_edges(nodes, 4);
 
 

polytopes.js

@@ -1,4 +1,3 @@
-
 import * as PERMUTE from './permute.js';
 
 function index_nodes(nodes, scale) {
@@ -185,13 +184,13 @@ function make_120cell_vertices() {
 
 	const nodes = [
 		PERMUTE.coordinates([0, 0, 2, 2],  0),
-		PERMUTE.coordinates([1, 1, 1, r5], 1),
-		PERMUTE.coordinates([phi, phi, phi, phi2inv], 2),
-		PERMUTE.coordinates([phiinv, phiinv, phiinv, phi2], 3),
+		PERMUTE.coordinates([1, 1, 1, r5], 0),
+		PERMUTE.coordinates([phi, phi, phi, phi2inv], 0),
+		PERMUTE.coordinates([phiinv, phiinv, phiinv, phi2], 0),
 
-		PERMUTE.coordinates([phi2, phi2inv, 1, 0], 4, true),
-		PERMUTE.coordinates([r5, phiinv, phi, 0], 5, true),
-		PERMUTE.coordinates([2, 1, phi, phiinv], 6, true),
+		PERMUTE.coordinates([phi2, phi2inv, 1, 0], 0, true),
+		PERMUTE.coordinates([r5, phiinv, phi, 0], 0, true),
+		PERMUTE.coordinates([2, 1, phi, phiinv], 0, true),
 		].flat();
 	index_nodes(nodes);
 	scale_nodes(nodes, 0.5);
@@ -209,6 +208,9 @@ function label_nodes(nodes, ids, label) {
 export const cell120 = () => {
 	const nodes  = make_120cell_vertices();
 	const links = auto_detect_edges(nodes, 4);
+
+	naive_label_120cell(nodes, links);
+
 	return {
 		nodes: nodes,
 		links: links,
@@ -391,6 +393,90 @@ function audit_link_labels(nodes, links) {
 
 
 
+function find_edges(links, nid) {
+	return links.filter((l) => l.source === nid || l.target === nid );
+}
+
+
+function find_adjacent(links, nid) {
+	return find_edges(links, nid).map((l) => {
+		if( l.source === nid ) {
+			return l.target;
+		} else {
+			return l.source;
+		}
+	});
+}
+
+function iterate_graph(nodes, links, n, fn) {
+	const queue = [];
+	const seen = {};
+	const nodes_id = {};
+	nodes.map((n) => nodes_id[n.id] = n);
+
+	queue.push(n.id);
+	seen[n.id] = true;
+	fn(n);
+
+	while( queue.length > 0 ) {
+		const v = queue.shift();
+		find_adjacent(links, v).map((aid) => {
+			if( !(aid in seen) ) {
+				seen[aid] = true;
+				queue.push(aid);
+				fn(nodes_id[aid]);
+			}
+		})
+	}
+}
+
+
+
+function dumb_label_120cell(nodes, links) {
+	let l = 0;
+
+	iterate_graph(nodes, links, nodes[0], (n) => {
+		n.label = l;
+		console.log(`Labelled ${n.id} ${n.label}`);
+		l++;
+		if( l > 2 ) {
+			l = 0;
+		}
+	})
+}
+
+
+// stupid tetrahedral labelling
+
+
+function naive_label_120cell(nodes, links, n) {
+	const nodes_id = {};
+	nodes.map((n) => nodes_id[n.id] = n);
+	iterate_graph(nodes, links, nodes[0], (n) => {
+		const cols = new Set();
+		const nbors = find_adjacent(links, n.id);
+		for( const nb of nbors ) {
+			if( nodes_id[nb].label > 0 ) {
+				cols.add(nodes_id[nb].label);
+			}
+			for( const nb2 of find_adjacent(links, nb) ) {
+				if( nb2 !== n.id && nodes_id[nb].label > 0 ) {
+					cols.add(nodes_id[nb2].label);
+				}
+			}
+		}
+		const pcols = [ 1, 2, 3, 4, 5 ].filter((c) => !cols.has(c));
+		if( pcols.length < 1 ) {
+			console.log(`Got stuck, no options at ${n.id}`);
+		} else {
+			n.label = pcols[0];
+			console.log(`applied ${pcols[0]} to node ${n.id}`);
+		}
+	}
+}
+
+
+
 export const cell600 = () => {
 	const nodes  = make_600cell_vertices();
 	const links = auto_detect_edges(nodes, 12);
@@ -406,5 +492,3 @@ export const cell600 = () => {
 }
 
 
-
-