Place new idties at certifiers barycenter

src/main.rs

@@ -267,6 +267,7 @@ impl<C: 'static + Debug + blockchain::Config, R: 'static + BcReader<C>> Gexplore
 		layout_module: &mut ResMut<LayoutModule>,
 		polylines: &mut ResMut<Assets<Polyline>>,
 		asset_handles: &Res<AssetHandles>,
+		query_idty: &mut Query<(&state::IdtyId, &Transform)>,
 	) {
 		let mut rng = rand::thread_rng();
 		let node_spawn_distrib = rand::distributions::Uniform::<f32>::new(-1.0, 1.0);
@@ -285,16 +286,37 @@ impl<C: 'static + Debug + blockchain::Config, R: 'static + BcReader<C>> Gexplore
 					.id(),
 			);
 			let nb_idties = layout_module.idty_map.len();
-			layout_module.layout.add_nodes(
-				&[],
-				forceatlas2::Nodes::Degree(1),
-				&[
-					node_spawn_distrib.sample(&mut rng),
-					node_spawn_distrib.sample(&mut rng),
-					node_spawn_distrib.sample(&mut rng),
-				],
-				None,
-			);
+
+			// Place new idty at its certifiers' barycenter
+			let mut pos = [
+				node_spawn_distrib.sample(&mut rng),
+				node_spawn_distrib.sample(&mut rng),
+				node_spawn_distrib.sample(&mut rng),
+			];
+			let mut nb_certifiers: usize = 0;
+			for cert in changeset.new_certs.iter() {
+				let cert = cert.value();
+				if cert.receiver == idty_id {
+					if let Some(issuer) = entities.idties.get(&cert.issuer) {
+						if let Ok(issuer) = query_idty.get(*issuer) {
+							nb_certifiers += 1;
+							pos[0] += issuer.1.translation[0];
+							pos[1] += issuer.1.translation[1];
+							pos[2] += issuer.1.translation[2];
+						}
+					}
+				}
+			}
+			if nb_certifiers > 0 {
+				let nb_certifiers = nb_certifiers as f32;
+				pos[0] /= nb_certifiers;
+				pos[1] /= nb_certifiers;
+				pos[2] /= nb_certifiers;
+			}
+
+			layout_module
+				.layout
+				.add_nodes(&[], forceatlas2::Nodes::Degree(1), &pos, None);
 			layout_module.idty_map.insert(idty_id, nb_idties);
 		}
 		for (cert_id, cert) in changeset.new_certs {
@@ -381,6 +403,7 @@ impl<C: 'static + Debug + blockchain::Config, R: 'static + BcReader<C>> Gexplore
 		mut meshes: ResMut<Assets<Mesh>>,
 		mut query_idty_material: Query<(&state::IdtyId, &mut Handle<StandardMaterial>)>,
 		mut query_idty_mesh: Query<(&state::IdtyId, &mut Handle<Mesh>)>,
+		mut query_idty_transform: Query<(&state::IdtyId, &Transform)>,
 		mut query_cert: Query<(&state::CertId, &mut PolylineMaterial)>,
 		mut measure_idty_list: ResMut<measure::idty::MeasureIdtyList>,
 		mut measure_cert_list: ResMut<measure::cert::MeasureCertList>,
@@ -530,6 +553,7 @@ impl<C: 'static + Debug + blockchain::Config, R: 'static + BcReader<C>> Gexplore
 							&mut layout_module,
 							&mut polylines,
 							&asset_handles,
+							&mut query_idty_transform,
 						);
 					}
 				}
@@ -542,6 +566,7 @@ impl<C: 'static + Debug + blockchain::Config, R: 'static + BcReader<C>> Gexplore
 							&mut layout_module,
 							&mut polylines,
 							&asset_handles,
+							&mut query_idty_transform,
 						);
 					}
 				}