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tools/verify-unity-draw-sort.mjs

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+#!/usr/bin/env node
+/**
+ * 自测 Unity 绘制排序（与 UnityDrawSort.ts 对齐）
+ * 运行: node tools/verify-unity-draw-sort.mjs
+ */
+
+const UNITY_SORTING_ORDER = { nProp: 1, tilemap: 2, vehicle: 2, prop: 3, player: 4 };
+const ORDER_SCALE = 10_000;
+const DEPTH_SCALE = 100;
+const TILE_ELEVATION_Y_THRESHOLD = 12;
+const HALF_W = 50;
+const HALF_H = 25;
+
+function cellToWorldCenter(x, y) {
+    const wx = (x - y) * HALF_W;
+    const wy = (x + y) * HALF_H + HALF_H;
+    return { x: wx, y: wy };
+}
+
+function unityTileIndividualSortingOrder(cellX, cellY) {
+    return UNITY_SORTING_ORDER.tilemap - cellX - cellY;
+}
+
+function compareTileCellDepth(ax, ay, bx, by) {
+    if (ay !== by) return by - ay;
+    return bx - ax;
+}
+
+function compareUnityTileToTile(a, b) {
+    const cellCmp = compareTileCellDepth(a.cellX, a.cellY, b.cellX, b.cellY);
+    if (cellCmp !== 0) return cellCmp;
+    const yCmp = Math.round(a.depthY * DEPTH_SCALE) - Math.round(b.depthY * DEPTH_SCALE);
+    if (Math.abs(yCmp) >= TILE_ELEVATION_Y_THRESHOLD) return yCmp;
+    return unityTileIndividualSortingOrder(a.cellX, a.cellY)
+        - unityTileIndividualSortingOrder(b.cellX, b.cellY);
+}
+
+function tileInFrontOfTile(front, back, depthFront = 0, depthBack = 0) {
+    const a = { cellX: front.x, cellY: front.y, depthY: depthFront };
+    const b = { cellX: back.x, cellY: back.y, depthY: depthBack };
+    return compareUnityTileToTile(a, b) > 0;
+}
+
+function compareIsoDrawOrder(ax, ay, bx, by) {
+    const ka = ax + ay;
+    const kb = bx + by;
+    if (ka !== kb) return kb - ka;
+    return ax - bx;
+}
+
+function wallFaceSamples(wallX, wallY) {
+    return [{ x: wallX, y: wallY - 1 }, { x: wallX - 1, y: wallY }];
+}
+
+function compareWallActorIso(actor, wallX, wallY) {
+    let actorAhead = 0;
+    for (const face of wallFaceSamples(wallX, wallY)) {
+        const iso = compareIsoDrawOrder(actor.x, actor.y, face.x, face.y);
+        if (iso < 0) return iso;
+        if (iso > actorAhead) actorAhead = iso;
+    }
+    return actorAhead;
+}
+
+function compareUnityEntityToWall(entity, tile) {
+    const cell = { x: entity.cellX, y: entity.cellY };
+    for (const face of wallFaceSamples(tile.cellX, tile.cellY)) {
+        if (face.x === cell.x && face.y === cell.y) return 1;
+    }
+    const tileOrder = unityTileIndividualSortingOrder(tile.cellX, tile.cellY);
+    if (tileOrder > entity.sortingOrder) return -1;
+    const wallIso = compareWallActorIso(cell, tile.cellX, tile.cellY);
+    if (wallIso < 0) {
+        if (tile.cellX === cell.x && tile.cellY === cell.y - 1) return -1;
+        if (tile.cellY < cell.y) return 1;
+        return -1;
+    }
+    const tileAhead = (tile.cellX + tile.cellY) - (cell.x + cell.y);
+    if (wallIso > 0 && tileAhead > 0) return -1;
+    if (wallIso > 0) return wallIso;
+    const yCmp = Math.round(entity.depthY * DEPTH_SCALE) - Math.round(tile.depthY * DEPTH_SCALE);
+    if (yCmp !== 0) return yCmp;
+    if (tileAhead !== 0) return -tileAhead;
+    return compareIsoDrawOrder(tile.cellX, tile.cellY, cell.x, cell.y);
+}
+
+function compareUnityEntityToTile(entity, tile) {
+    if (tile.tileName !== 'WallBlock') return 1;
+    return compareUnityEntityToWall(entity, tile);
+}
+
+function entityInFrontOfTile(entity, tile) {
+    return compareUnityEntityToTile(entity, tile) > 0;
+}
+
+function walkableUnderPlayer(playerCell, tileCell) {
+    return entityInFrontOfTile(
+        { sortingOrder: 4, cellX: playerCell.x, cellY: playerCell.y, centerY: 0, depthY: 0 },
+        { cellX: tileCell.x, cellY: tileCell.y, tileName: 'Baseblock', centerY: 0, depthY: 0 },
+    );
+}
+
+function playerBottomY(cellX, cellY) {
+    return cellToWorldCenter(cellX, cellY).y - 0.35 * 90;
+}
+
+function wallFrontY(cellX, cellY) {
+    const c = cellToWorldCenter(cellX, cellY);
+    return Math.max(c.y, c.y + (1 - 0.67) * 115);
+}
+
+const cases = [
+    {
+        name: '砖↔砖：斜向路径 (0,-2)→(0,-1)→(0,0)→(1,0) 下方逐格遮挡',
+        pass: tileInFrontOfTile({ x: 0, y: -2 }, { x: 0, y: -1 })
+            && tileInFrontOfTile({ x: 0, y: -1 }, { x: 0, y: 0 })
+            && tileInFrontOfTile({ x: 0, y: 0 }, { x: 1, y: 0 }),
+    },
+    {
+        name: '砖↔砖：对角路径 (0,-3)→(1,-2)→(2,-1)→(3,0) 下方逐格遮挡',
+        pass: tileInFrontOfTile({ x: 0, y: -3 }, { x: 1, y: -2 })
+            && tileInFrontOfTile({ x: 1, y: -2 }, { x: 2, y: -1 })
+            && tileInFrontOfTile({ x: 2, y: -1 }, { x: 3, y: 0 }),
+    },
+    {
+        name: '砖↔砖：南侧 (0,-1) 挡住北侧 (0,0)',
+        pass: tileInFrontOfTile({ x: 0, y: -1 }, { x: 0, y: 0 }),
+    },
+    {
+        name: '砖↔砖：东南 (2,-2) 挡住西北 (0,-1)',
+        pass: tileInFrontOfTile({ x: 2, y: -2 }, { x: 0, y: -1 }),
+    },
+    {
+        name: '91614 出生 (0,-1) 不被北侧墙 (0,0) 挡住',
+        pass: entityInFrontOfTile(
+            { sortingOrder: 4, cellX: 0, cellY: -1, centerY: 0, depthY: 0 },
+            { cellX: 0, cellY: 0, tileName: 'WallBlock', centerY: 0, depthY: 0 },
+        ),
+    },
+    {
+        name: '跨格路径砖：南侧 (0,-2) 不挡北侧角色 (0,-1)',
+        pass: entityInFrontOfTile(
+            { sortingOrder: 4, cellX: 0, cellY: -1, centerY: 0, depthY: 0 },
+            { cellX: 0, cellY: -2, tileName: 'Baseblock', centerY: 0, depthY: 100 },
+        ),
+    },
+    {
+        name: '91614 真实Y：出生 (0,-1) 在 (0,0) 墙前',
+        pass: entityInFrontOfTile(
+            { sortingOrder: 4, cellX: 0, cellY: -1, centerY: 0, depthY: playerBottomY(0, -1) },
+            { cellX: 0, cellY: 0, tileName: 'WallBlock', centerY: 0, depthY: wallFrontY(0, 0) },
+        ),
+    },
+];
+
+let failed = 0;
+for (const c of cases) {
+    const ok = !!c.pass;
+    console.log(`${ok ? '✓' : '✗'} ${c.name}`);
+    if (!ok) failed++;
+}
+
+if (failed > 0) {
+    console.error(`\n${failed} case(s) failed`);
+    process.exit(1);
+}
+console.log(`\nAll ${cases.length} cases passed.`);