feat: manually mirror opencoze's code from bytedance

Change-Id: I09a73aadda978ad9511264a756b2ce51f5761adf

frontend/packages/components/resource-tree/src/utils/line.ts

@@ -0,0 +1,38 @@
+/*
+ * Copyright 2025 coze-dev Authors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+ 
+import { Bezier } from 'bezier-js';
+import { type IPoint, Point } from '@flowgram-adapter/fixed-layout-editor';
+
+import { type CustomLine } from '../typings';
+import { getBezierVerticalControlPoints } from '../components/lines-render/utils';
+
+export const getLineId = (line?: CustomLine) => {
+  if (!line) {
+    return undefined;
+  }
+  return `${line.from.id}${line.to.id}`;
+};
+
+export const calcDistance = (pos: IPoint, line?: CustomLine) => {
+  if (!line) {
+    return Number.MAX_SAFE_INTEGER;
+  }
+  const { fromPoint, toPoint } = line;
+  const controls = getBezierVerticalControlPoints(line.fromPoint, line.toPoint);
+  const bezier = new Bezier([fromPoint, ...controls, toPoint]);
+  return Point.getDistance(pos, bezier.project(pos));
+};