tanqiu/assets/scripts/BulletController.ts

import { _decorator, Component, Node, Vec2, Vec3, find, RigidBody2D, Collider2D, Contact2DType, IPhysics2DContact } from 'cc';
const { ccclass, property } = _decorator;

@ccclass('BulletController')
export class BulletController extends Component {
    @property
    public speed: number = 300;

    @property
    public damage: number = 10;

    @property
    public lifetime: number = 5;

    private targetEnemy: Node = null;
    private rigidBody: RigidBody2D = null;
    private lifeTimer: number = 0;
    private initialDirection: Vec2 = null; // 存储初始方向

    start() {
        // 获取刚体组件
        this.rigidBody = this.node.getChildByName('Icon').getComponent(RigidBody2D);
        
        // 设置子弹生命周期
        this.lifeTimer = this.lifetime;
        
        // 查找最近的敌人
        this.findNearestEnemy();
        
        // 如果没有找到敌人，设置随机方向
        if (!this.initialDirection) {
            const angle = Math.random() * Math.PI * 2;
            this.initialDirection = new Vec2(
                Math.cos(angle),
                Math.sin(angle)
            );
            console.log('未找到敌人目标，设置随机方向');
        }
        
        // 设置初始速度
        this.updateVelocity();
        
        // 注册碰撞事件
        const collider = this.node.getChildByName('Icon').getComponent(Collider2D);
        if (collider) {
            collider.on(Contact2DType.BEGIN_CONTACT, this.onBeginContact, this);
        }
    }

    // 查找最近的敌人
    findNearestEnemy() {
        // 直接查找enemyContainer节点
        const enemyContainer = find('Canvas/GameLevelUI/enemyContainer');
        if (!enemyContainer) {
            console.warn('找不到enemyContainer节点');
            return;
        }
        
        // 获取enemyContainer下的所有子节点（敌人）
        const enemies = enemyContainer.children;
        if (!enemies || enemies.length === 0) {
            console.log('没有可用的敌人目标');
            return;
        }
        
        console.log(`在enemyContainer中找到 ${enemies.length} 个敌人`);
        
        // 找到最近的敌人
        let nearestEnemy = null;
        let minDistance = Number.MAX_VALUE;
        
        for (const enemy of enemies) {
            if (!enemy || !enemy.isValid) continue;
            
            const distance = Vec3.distance(this.node.worldPosition, enemy.worldPosition);
            if (distance < minDistance) {
                minDistance = distance;
                nearestEnemy = enemy;
            }
        }
        
        if (nearestEnemy) {
            this.targetEnemy = nearestEnemy;
            
            // 计算朝向敌人的方向，并保存为初始方向
            const bulletPos = this.node.worldPosition;
            const enemyPos = this.targetEnemy.worldPosition;
            
            this.initialDirection = new Vec2(
                enemyPos.x - bulletPos.x,
                enemyPos.y - bulletPos.y
            );
            this.initialDirection.normalize();
            
            console.log('子弹锁定敌人目标，设置初始方向');
        }
    }

    // 更新子弹速度方向
    updateVelocity() {
        if (!this.rigidBody) return;
        
        // 使用初始方向，不追踪敌人
        if (this.initialDirection) {
            // 设置速度
            this.rigidBody.linearVelocity = new Vec2(
                this.initialDirection.x * this.speed,
                this.initialDirection.y * this.speed
            );
        }
    }

    // 碰撞检测
    onBeginContact(selfCollider: Collider2D, otherCollider: Collider2D, contact: IPhysics2DContact | null) {
        // 检查是否碰到敌人
        if (otherCollider.node.name === 'Enemy') {
            console.log('子弹击中敌人');
            
            // 获取EnemyController
            const enemyController = find('Canvas/GameLevelUI/EnemyController');
            if (enemyController) {
                const enemyControllerComp = enemyController.getComponent('EnemyController');
                if (enemyControllerComp) {
                    // 对敌人造成伤害
                    (enemyControllerComp as any).damageEnemy(otherCollider.node, this.damage);
                }
            }
            
            // 销毁子弹
            this.destroyBullet();
        }
        // 检查是否碰到墙体或其他物体
        else if (otherCollider.node.name !== 'Ball') { // 不与小球碰撞
            this.destroyBullet();
        }
    }

    // 销毁子弹
    destroyBullet() {
        if (this.node && this.node.isValid) {
            this.node.destroy();
        }
    }

    update(dt: number) {
        // 更新生命周期
        this.lifeTimer -= dt;
        if (this.lifeTimer <= 0) {
            this.destroyBullet();
            return;
        }
        
        // 注意：不再每帧更新速度方向，子弹将沿初始方向直线移动
    }
}