fix: optimize snapToGrid options for manhattan (#3071)

Author: NewByVector

packages/x6/src/registry/router/manhattan/options.ts

@@ -186,7 +186,7 @@ export const defaults: ManhattanRouterOptions = {
 
   fallbackRouter: orth,
   draggingRouter: null,
-  snapToGrid: false,
+  snapToGrid: true,
 }
 
 export function resolve<T>(

packages/x6/src/registry/router/manhattan/router.ts

@@ -265,6 +265,32 @@ function findRoute(
   return null
 }
 
+function snap(vertices: Point[], gridSize = 10) {
+  if (vertices.length <= 1) {
+    return vertices
+  }
+
+  for (let i = 0, len = vertices.length; i < len - 1; i += 1) {
+    const first = vertices[i]
+    const second = vertices[i + 1]
+    if (first.x === second.x) {
+      const x = gridSize * Math.round(first.x / gridSize)
+      if (first.x !== x) {
+        first.x = x
+        second.x = x
+      }
+    } else if (first.y === second.y) {
+      const y = gridSize * Math.round(first.y / gridSize)
+      if (first.y !== y) {
+        first.y = y
+        second.y = y
+      }
+    }
+  }
+
+  return vertices
+}
+
 export const router: Router.Definition<ManhattanRouterOptions> = function (
   vertices,
   optionsRaw,
@@ -282,7 +308,7 @@ export const router: Router.Definition<ManhattanRouterOptions> = function (
   )
 
   const oldVertices = vertices.map((p) => Point.create(p))
-  let newVertices: Point[] = []
+  const newVertices: Point[] = []
 
   // The origin of first route's grid, does not need snapping
   let tailPoint = sourceEndpoint
@@ -351,10 +377,7 @@ export const router: Router.Definition<ManhattanRouterOptions> = function (
   }
 
   if (options.snapToGrid) {
-    newVertices = newVertices.map((vertice) => {
-      const gridSize = edgeView.graph.grid.getGridSize()
-      return vertice.snapToGrid(gridSize)
-    })
+    return snap(newVertices, edgeView.graph.grid.getGridSize())
   }
 
   return newVertices