_Aliens/assets/module_aliens/Script/Components/RadarComponent.ts

import { _decorator, Component, Node, Vec3 } from 'cc';
import { EventDispatcher } from 'db://assets/core_tgx/easy_ui_framework/EventDispatcher';
import { GameEvent } from '../Enum/GameEvent';
import { AliensGlobalInstance } from '../AliensGlobalInstance';
const { ccclass, property } = _decorator;

@ccclass('RadarComponent')
export class RadarComponent extends Component {

    //渲染的目标节点
    private _targetNode: Node = null!;

    start() {
        this.registerEvent();
    }

    private registerEvent(){
        EventDispatcher.instance.on(GameEvent.EVENT_CAMERA_SCREENSHOT_RADAR,this.onRadar,this);
    }

    private unregisterEvent(){
        EventDispatcher.instance.off(GameEvent.EVENT_CAMERA_SCREENSHOT_RADAR,this.onRadar,this);
    }

    private async onRadar(){
        this.node.active = true;

        //获取目标节点
        this._targetNode = await this.getTargetNode();
    }

    //显示侦擦目标的位置
    public showRadarTargetPos(targetPos:Vec3){
        console.log('显示侦擦目标的位置:',targetPos);
    }

    //获取目标节点
    private  async getTargetNode():Promise<Node> {
        return new Promise<Node>((resolve, reject) => {
            const levelNode = AliensGlobalInstance.instance.levels.children[0];
            const et = levelNode.getChildByName('et');
            resolve(et.children[Math.floor(Math.random() * et.children.length)]);
        });
    }

    protected onDestroy(): void {
        this.unregisterEvent();
    }
}