level: add random-walk npcs

Author: kt3k

model/character.ts

@@ -83,7 +83,7 @@ export type ItemContainer = {
   remove(i: number, j: number): void
 }
 
-type NPCType = "random" | "random-walk" | "static"
+export type NPCType = "random" | "random-walk" | "static"
 
 export function spawnCharacter(
   id: string,
@@ -488,8 +488,6 @@ export class RandomlyTurnNPC extends Character {
 }
 
 export class RandomWalkNPC extends Character {
-  #counter = 32
-
   override getNextAction(
     fieldTester: IFieldTester,
     collisionChecker: CollisionChecker,

model/field-block.ts

@@ -2,7 +2,7 @@ import { CanvasWrapper } from "../util/canvas-wrapper.ts"
 import { BLOCK_CHUNK_SIZE, BLOCK_SIZE, CELL_SIZE } from "../util/constants.ts"
 import { seedrandom } from "../util/random.ts"
 import { ceilN, floorN, modulo } from "../util/math.ts"
-import type { CellName, IBox } from "./character.ts"
+import type { CellName, IBox, NPCType } from "./character.ts"
 import type { Item } from "./item.ts"
 
 /**
@@ -42,7 +42,7 @@ export class FieldCell {
 class _ItemData {
 }
 
-type CharacterType = "static" | "random"
+type CharacterType = NPCType
 type CharacterSpeed = 1 | 2 | 4 | 8 | 16
 type Dir = "up" | "down" | "left" | "right"
 
@@ -551,4 +551,9 @@ export class FieldBlock {
   addSpawnInfo(spawn: SpawnInfo): void {
     this.#spawnInfoByChunk.add(spawn)
   }
+
+  /** Clears the spawn info */
+  clearSpawnInfo(): void {
+    this.#spawnInfoByChunk = new SpawnInfoByChunk([])
+  }
 }