snapshot of https://github.com/dream-num/univer.git (dev, 2026-09-16; blobs > 131072B omitted)

packages/engine-render/src/__tests__/alignment-snap.spec.ts

@@ -0,0 +1,49 @@
+/**
+ * Copyright 2023-present DreamNum Co., Ltd.
+ *
+ * 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 { describe, expect, it } from 'vitest';
+import {
+    AlignmentSnapSession,
+    getAlignmentRectXAnchors,
+    getAlignmentRectYAnchors,
+    getClosestAlignmentOffset,
+} from '../alignment-snap';
+
+describe('alignment snap', () => {
+    it('resolves normalized edge and center anchors', () => {
+        const rect = { left: 30, top: 50, width: -20, height: -40 };
+
+        expect(getAlignmentRectXAnchors(rect)).toEqual([10, 20, 30]);
+        expect(getAlignmentRectYAnchors(rect)).toEqual([10, 30, 50]);
+        expect(getClosestAlignmentOffset([10, 20, 30], [32], 3)).toBe(2);
+    });
+
+    it('uses hysteresis and breakaway without accumulating correction', () => {
+        const session = new AlignmentSnapSession({
+            enterThreshold: 6,
+            exitThreshold: 14,
+            breakawayThreshold: 4,
+            cooldownMs: 250,
+        });
+        const guide = { id: 'x:100', axis: 'x' as const, position: 100 };
+
+        expect(session.resolveAxisSnap({ axis: 'x', value: 97, guide, now: 0 })).toMatchObject({ snapped: true, value: 100 });
+        expect(session.resolveAxisSnap({ axis: 'x', value: 99, guide, now: 1 })).toMatchObject({ snapped: true, value: 100 });
+        expect(session.resolveAxisSnap({ axis: 'x', value: 103, guide, now: 2 })).toMatchObject({ snapped: false, value: 103 });
+        expect(session.resolveAxisSnap({ axis: 'x', value: 99, guide, now: 100 })).toMatchObject({ snapped: false, value: 99 });
+        expect(session.resolveAxisSnap({ axis: 'x', value: 99, guide, now: 300 })).toMatchObject({ snapped: true, value: 100 });
+    });
+});