feuerwerk/tests/viewport/sort-with-parent.test.ts

import { describe, expect, it } from 'vitest';
import {
  CreateAssetCommand,
  ResetAssetPropertyCommand,
  SetAssetPropertyCommand,
} from '../../src/core/commands/assetCommands';
import { SetOverrideCommand } from '../../src/core/commands/sceneObjectCommands';
import {
  PaintTilesCommand,
  RenameTilemapLayerCommand,
  SetTilemapLayerSortByYCommand,
} from '../../src/core/commands/tilemapCommands';
import type { TilemapAsset } from '../../src/core/model/Asset';
import type { AssetType } from '../../src/core/model/AssetTypes';
import { findAsset } from '../../src/core/model/Project';
import { schemaFor, SORT_WITH_PARENT_KEY } from '../../src/core/properties/PropertySchema';
import { isModified, resolveAssetProps } from '../../src/core/properties/resolve';
import { drawSlots } from '../../src/viewport/drawOrder';
import { collectHolderItems, collectWorldItems } from '../../src/viewport/items';
import { stackAt } from '../../src/viewport/pick';
import { makeSpriteScene, place, roundTrip, startWorld } from '../helpers';

/** "Box" (the player, 100 units tall) and "Weapon", its child, two sprite assets of their own. */
function makeScene() {
  const f = makeSpriteScene('Box');
  const names = new Map<string, string>();
  const asset = (type: AssetType, name: string) => {
    const created = new CreateAssetCommand(type, name);
    f.stack.execute(created);
    return created.asset.id;
  };
  const weaponId = asset('sprite', 'Weapon');
  const put = (name: string, assetId: string, at: { x: number; y: number; z: number }, parentId = '') => {
    const id = place(f, assetId, at, parentId);
    names.set(id, name);
    return id;
  };
  const sortWithParent = (assetId: string, on: boolean) =>
    f.stack.execute(new SetAssetPropertyCommand(assetId, SORT_WITH_PARENT_KEY, on));
  const order = () =>
    drawSlots(collectHolderItems(f.project, f.sceneOf(), 0).items).map((s) =>
      s.layerId ? `${names.get(s.id)} ${s.row ?? ''}`.trim() : names.get(s.id)!,
    );
  return { f, names, asset, weaponId, put, sortWithParent, order };
}

describe('a child sorted with its parent (#232)', () => {
  it('is on for a new sprite, text and source, off for one stored without it', () => {
    const s = makeScene();
    for (const type of ['sprite', 'text', 'particles'] as const) {
      const id = s.asset(type, type);
      expect(findAsset(s.f.project, id)!.props[SORT_WITH_PARENT_KEY], type).toBe(true);
      expect(
        schemaFor(type).some((d) => d.key === SORT_WITH_PARENT_KEY),
        type,
      ).toBe(true);
    }
    for (const type of ['tilemap', 'container', 'camera', 'collider', 'behavior'] as const)
      expect(
        schemaFor(type).some((d) => d.key === SORT_WITH_PARENT_KEY),
        type,
      ).toBe(false);

    const weapon = findAsset(s.f.project, s.weaponId)!;
    delete weapon.props[SORT_WITH_PARENT_KEY];
    const loaded = findAsset(roundTrip(s.f.project), s.weaponId)!;
    expect(resolveAssetProps(s.f.project, loaded)[SORT_WITH_PARENT_KEY]).toBe(false);
  });

  it('marks an asset only once it is switched off, and Reset switches it on again', () => {
    const s = makeScene();
    const modified = () => isModified(s.f.project, findAsset(s.f.project, s.weaponId)!, SORT_WITH_PARENT_KEY);
    expect(modified()).toBe(false);
    s.sortWithParent(s.weaponId, false);
    expect(modified()).toBe(true);
    s.f.stack.execute(new ResetAssetPropertyCommand(s.weaponId, SORT_WITH_PARENT_KEY));
    expect(findAsset(s.f.project, s.weaponId)!.props[SORT_WITH_PARENT_KEY]).toBe(true);
    expect(modified()).toBe(false);
    delete findAsset(s.f.project, s.weaponId)!.props[SORT_WITH_PARENT_KEY];
    expect(modified()).toBe(false);
  });

  it('keeps a child below 0 right behind its parent instead of behind everything on 0', () => {
    const s = makeScene();
    s.put('other', s.f.spriteId, { x: 300, y: 0, z: 0 });
    const box = s.put('box', s.f.spriteId, { x: 0, y: 0, z: 0 });
    s.put('weapon', s.weaponId, { x: 0, y: 0, z: -1 }, box);
    expect(s.order()).toEqual(['other', 'weapon', 'box']);
    s.sortWithParent(s.weaponId, false);
    expect(s.order()).toEqual(['weapon', 'other', 'box']);
  });

  it('keeps a child above 0 right in front of its parent, below what is in front of the parent', () => {
    const s = makeScene();
    const box = s.put('box', s.f.spriteId, { x: 0, y: 0, z: 0 });
    s.put('weapon', s.weaponId, { x: 0, y: 0, z: 2 }, box);
    s.put('front', s.f.spriteId, { x: 300, y: 0, z: 1 });
    expect(s.order()).toEqual(['box', 'weapon', 'front']);
    s.sortWithParent(s.weaponId, false);
    expect(s.order()).toEqual(['box', 'front', 'weapon']);
  });

  it('orders the children of one parent by their own z, ties in hierarchy order', () => {
    const s = makeScene();
    const box = s.put('box', s.f.spriteId, { x: 0, y: 0, z: 5 });
    s.put('a', s.weaponId, { x: 0, y: 0, z: 6 }, box);
    s.put('b', s.weaponId, { x: 0, y: 0, z: 3 }, box);
    s.put('c', s.weaponId, { x: 0, y: 0, z: 5 }, box);
    s.put('d', s.weaponId, { x: 0, y: 0, z: 4 }, box);
    s.put('under', s.f.spriteId, { x: 300, y: 0, z: 4.5 });
    expect(s.order()).toEqual(['under', 'b', 'd', 'box', 'c', 'a']);
  });

  it('chains up to the topmost parent, and stops where a link sorts on its own', () => {
    const s = makeScene();
    const hand = s.asset('sprite', 'Hand');
    s.put('other', s.f.spriteId, { x: 300, y: 0, z: 0 });
    const box = s.put('box', s.f.spriteId, { x: 0, y: 0, z: 0 });
    const handId = s.put('hand', hand, { x: 0, y: 0, z: 0 }, box);
    s.put('weapon', s.weaponId, { x: 0, y: 0, z: -1 }, handId);
    expect(s.order()).toEqual(['other', 'weapon', 'box', 'hand']);
    s.sortWithParent(hand, false);
    // The hand is sorted on its own now; the weapon still sorts with it, behind it and not behind all.
    expect(s.order()).toEqual(['other', 'box', 'weapon', 'hand']);
  });

  it('can be switched per placed object', () => {
    const s = makeScene();
    s.put('other', s.f.spriteId, { x: 300, y: 0, z: 0 });
    const box = s.put('box', s.f.spriteId, { x: 0, y: 0, z: 0 });
    const weapon = s.put('weapon', s.weaponId, { x: 0, y: 0, z: -1 }, box);
    s.f.stack.execute(new SetOverrideCommand(s.f.sceneId, weapon, SORT_WITH_PARENT_KEY, false));
    expect(s.order()).toEqual(['weapon', 'other', 'box']);
    s.f.stack.undo();
    expect(s.order()).toEqual(['other', 'weapon', 'box']);
  });

  it('does nothing under a parent that is not drawn or is a tilemap', () => {
    const s = makeScene();
    const map = s.asset('tilemap', 'Map');
    const group = s.asset('container', 'Group');
    s.put('other', s.f.spriteId, { x: 300, y: 0, z: 0 });
    const mapObject = s.put('map', map, { x: 0, y: 0, z: 0 });
    const groupObject = s.put('group', group, { x: 0, y: 0, z: 0 });
    s.put('underMap', s.weaponId, { x: 0, y: 0, z: -1 }, mapObject);
    s.put('underGroup', s.weaponId, { x: 0, y: 0, z: -2 }, groupObject);
    // The map comes twice: its own node, then its one layer drawn as a piece.
    expect(s.order()).toEqual(['underGroup', 'underMap', 'other', 'map', 'map']);
  });

  /**
   * A 20 × 15 map of 48-unit cells at the origin with "Trees" sorted by Y: a trunk on row 5 (ends at
   * -72) and one on row 8 (ends at 72). The player stands with its feet at -50, between the two.
   */
  function onSortedMap() {
    const s = makeScene();
    const mapId = s.asset('tilemap', 'Forest');
    const trees = (findAsset(s.f.project, mapId) as TilemapAsset).layers[0]!.id;
    s.f.stack.execute(new RenameTilemapLayerCommand(mapId, trees, 'Trees'));
    const trunk = s.asset('tile', 'Trunk');
    s.f.stack.execute(
      new PaintTilesCommand(mapId, trees, [
        { x: 2, y: 5, tileId: trunk },
        { x: 7, y: 8, tileId: trunk },
      ]),
    );
    s.f.stack.execute(new SetTilemapLayerSortByYCommand(mapId, trees, true));
    s.put('map', mapId, { x: 0, y: 0, z: 0 });
    const box = s.put('box', s.f.spriteId, { x: 0, y: -100, z: 0 });
    return { ...s, box };
  }

  it("stands on its parent's feet on a z sorted by Y", () => {
    const behind = onSortedMap();
    behind.put('weapon', behind.weaponId, { x: 0, y: -100, z: -1 }, behind.box);
    expect(behind.order()).toEqual(['map', 'map 5', 'weapon', 'box', 'map 8']);
    behind.sortWithParent(behind.weaponId, false);
    expect(behind.order()).toEqual(['weapon', 'map', 'map 5', 'box', 'map 8']);

    // Held high above the head its own box ends above row 5, but it is drawn with the player.
    const raised = onSortedMap();
    raised.put('weapon', raised.weaponId, { x: 0, y: -200, z: 0 }, raised.box);
    expect(raised.order()).toEqual(['map', 'map 5', 'box', 'weapon', 'map 8']);
    raised.sortWithParent(raised.weaponId, false);
    expect(raised.order()).toEqual(['map', 'weapon', 'map 5', 'box', 'map 8']);
  });

  it('holds in the running game and when picking', () => {
    const s = makeScene();
    s.put('other', s.f.spriteId, { x: 0, y: 0, z: 0 });
    const box = s.put('box', s.f.spriteId, { x: 0, y: 0, z: 0 });
    s.put('weapon', s.weaponId, { x: 0, y: 0, z: -1 }, box);
    const { world } = startWorld(s.f);
    expect(drawSlots(collectWorldItems(world).items).map((slot) => s.names.get(slot.id))).toEqual([
      'other',
      'weapon',
      'box',
    ]);
    const items = collectHolderItems(s.f.project, s.f.sceneOf(), 0).items;
    const hits = [...s.names.keys()].map((id) => ({ id, layers: null }));
    expect(stackAt(items, hits).map((id) => s.names.get(id))).toEqual(['box', 'weapon', 'other']);
  });
});