routing link crossover violation added

database/admin/layout/mxpic_project_1/mxpic_project_1.yml

@@ -0,0 +1,99 @@
+# =============================================
+# mxPIC Cell/Project Definition File
+# =============================================
+schema_version: "2.0.0"
+kind: cell
+coordinate_system: gds_y_up
+canvas_size:
+  width: 5000
+  height: 5000
+project: mxpic_project_1
+name: mxpic_project_1
+type: project
+version: "1.0.0"
+
+# 1. External Ports (How this cell connects to the outside world)
+ports: []
+
+# 2. Instances (The sub-components dropped onto this canvas)
+instances:
+  MMI_1:
+    component: Silterra/EMO1_2ML_CU_Al_RDL/primitives/multimode_interferometers/1x2MMI_1310nm_TE_Silterra_202603_ZKY_v2
+    x: 476.0
+    y: -2453.2
+    rotation: 0.0
+    flip: 0
+    flop: 0
+    mirror: false
+    settings:
+    length:
+
+  MMI_2:
+    component: Silterra/EMO1_2ML_CU_Al_RDL/primitives/multimode_interferometers/1x2MMI_1310nm_TE_Silterra_202603_ZKY_v2
+    x: 723.1
+    y: -2241.8
+    rotation: 0.0
+    flip: 0
+    flop: 0
+    mirror: false
+    settings:
+    length:
+
+  MMI_3:
+    component: Silterra/EMO1_2ML_CU_Al_RDL/primitives/multimode_interferometers/1x2MMI_1310nm_TE_Silterra_202603_ZKY_v2
+    x: 438.9
+    y: -2230.2
+    rotation: 0.0
+    flip: 0
+    flop: 0
+    mirror: false
+    settings:
+    length:
+
+  MMI_4:
+    component: Silterra/EMO1_2ML_CU_Al_RDL/primitives/multimode_interferometers/1x2MMI_1310nm_TE_Silterra_202603_ZKY_v2
+    x: 750.9
+    y: -2468.7
+    rotation: 0.0
+    flip: 0
+    flop: 0
+    mirror: false
+    settings:
+    length:
+
+elements:
+  anchor_1:
+    type: anchor
+    x: 421.9
+    y: -2624.7
+    angle: 0.0
+    layer: WG_CORE
+    width: 0.5
+    description: ""
+
+# 3. Bundles (Grouped links for multi-bus/parallel routing)
+bundles:
+  output_bus:
+    routing_type: euler_bend
+    links:
+      - from: MMI_2:a1
+        to: MMI_1:b1
+        xsection: strip
+        family: optical
+        width: 0.45
+        radius: 10
+        routing_type: euler_bend
+      - from: anchor_1:right
+        to: MMI_4:a1
+        xsection: strip
+        family: optical
+        width: 0.45
+        radius: 10
+        routing_type: euler_bend
+      - from: anchor_1:left
+        to: MMI_3:a1
+        xsection: strip
+        family: optical
+        width: 0.45
+        radius: 10
+        routing_type: euler_bend

frontend/canvas.html

@@ -5181,13 +5181,21 @@
           style: view.style,
           data: { route }
         };
+        const nodeMap = Object.fromEntries(activePage.nodes.map(node => [node.id, node]));
+        const conflict = findSameTypeRouteCrossing(candidate, activePage.edges, nodeMap, technologyManifest);
+        if (conflict) {
+          const source = nodeMap[conflict.conflictEdge.source]?.data?.componentDisplayName || conflict.conflictEdge.source;
+          const target = nodeMap[conflict.conflictEdge.target]?.data?.componentDisplayName || conflict.conflictEdge.target;
+          addLog(`Connection rejected: ${route.xsection} route crosses ${source} to ${target}.`);
+          return;
+        }
         setPages(prev => prev.map(p => (
           p.id === activePageId
             ? { ...p, edges: addEdge(candidate, p.edges) }
             : p
         )));
         addLog(`Connected ${connection.sourceHandle} to ${connection.targetHandle}.`);
-      }, [activePageId, activePage, rulerMode, currentLinkRoute, addLog]);
+      }, [activePageId, activePage, rulerMode, currentLinkRoute, technologyManifest, addLog]);
 
       const handleRouteEdgeMouseDown = useCallback((event) => {
         if (rulerMode) return false;

tests/layout-ui-wiring.test.js

@@ -92,9 +92,11 @@ assert(
     canvasHtml.includes('onConnect={handleBasicConnection}') &&
     canvasHtml.includes('nodesConnectable={true}') &&
     canvasHtml.includes('connectionMode="loose"') &&
+    canvasHtml.includes('const conflict = findSameTypeRouteCrossing(candidate, activePage.edges, nodeMap, technologyManifest);') &&
+    canvasHtml.includes('Connection rejected:') &&
     canvasHtml.includes('data: { route }') &&
     canvasHtml.includes('addEdge(candidate, p.edges)'),
-  'canvas should use React Flow native pin-to-pin connections for new links'
+  'canvas should use React Flow native pin-to-pin connections and reject same-xsection crossings for new links'
 );
 assert(
   !canvasHtml.includes('linkDraft') &&