Movement improvements

assets/Scripts/Game/Unit/Enemy/EnemyMover/PeriodicFollowTargetEnemyMover.ts

@@ -0,0 +1,57 @@
+import { Node, Vec3 } from "cc";
+import { Enemy } from "../Enemy";
+import { EnemyMover } from "./EnemyMover";
+
+export class PeriodicFollowTargetEnemyMover extends EnemyMover {
+    private enemyToFollowState: Map<Enemy, EnemyFollowState> = new Map<Enemy, EnemyFollowState>();
+    private enemyToStateTimeLeft: Map<Enemy, number> = new Map<Enemy, number>();
+
+    public constructor(targetNode: Node, private followTime: number, private waitTime: number) {
+        super(targetNode);
+    }
+
+    public addEnemy(enemy: Enemy): void {
+        this.setEnemyFollowState(enemy, EnemyFollowState.Follow, this.followTime);
+        super.addEnemy(enemy);
+    }
+
+    public removeEnemy(enemy: Enemy): void {
+        super.removeEnemy(enemy);
+    }
+
+    public gameTick(deltaTime: number): void {
+        for (const enemy of this.enemies) {
+            const stateTimeLeft: number = this.enemyToStateTimeLeft.get(enemy) - deltaTime;
+            if (stateTimeLeft <= 0) {
+                this.switchEnemyFollowState(enemy);
+            } else {
+                this.enemyToStateTimeLeft.set(enemy, stateTimeLeft);
+
+                if (this.enemyToFollowState.get(enemy) === EnemyFollowState.Follow) {
+                    let direction: Vec3 = new Vec3();
+                    direction = Vec3.subtract(direction, this.targetNode.worldPosition, enemy.node.worldPosition);
+                    enemy.moveBy(direction.normalize(), deltaTime);
+                }
+            }
+        }
+    }
+
+    private switchEnemyFollowState(enemy: Enemy): void {
+        const followState: EnemyFollowState = this.enemyToFollowState.get(enemy);
+        if (followState === EnemyFollowState.Follow) {
+            this.setEnemyFollowState(enemy, EnemyFollowState.Wait, this.waitTime);
+        } else if (followState === EnemyFollowState.Wait) {
+            this.setEnemyFollowState(enemy, EnemyFollowState.Follow, this.followTime);
+        }
+    }
+
+    private setEnemyFollowState(enemy: Enemy, followState: EnemyFollowState, stateTimeLeft: number): void {
+        this.enemyToFollowState.set(enemy, followState);
+        this.enemyToStateTimeLeft.set(enemy, stateTimeLeft);
+    }
+}
+
+export enum EnemyFollowState {
+    Follow,
+    Wait
+}

assets/Scripts/Game/Unit/Enemy/EnemyMover/PeriodicFollowTargetEnemyMover.ts.meta

@@ -0,0 +1,9 @@
+{
+  "ver": "4.0.23",
+  "importer": "typescript",
+  "imported": true,
+  "uuid": "02c4b3ec-3f77-485d-a539-32564ed5d63b",
+  "files": [],
+  "subMetas": {},
+  "userData": {}
+}