team2_jj/assets/scripts/battle/SightGlass.ts

import { _decorator, Component, Node, UITransform, v3 } from 'cc';
import { DataSystem } from '../core/data/DataSystem';
import { BattleData } from './BattleData';
import { Monster } from './Monster';
const { ccclass, property } = _decorator;

@ccclass('SightGlass')
export class SightGlass extends Component {
    @property({ type: Node, tooltip: "瞄准镜" }) sightGlass: Node;

    private data: BattleData;
    private fouceTarget: Node;
    private lastMonsterID: number = -1;
    start() {
        this.data = DataSystem.getData(BattleData);
    }
    update(): void {
        DataSystem.watch(BattleData, "_monsters") && this.onMonsterChange();
        DataSystem.watch(BattleData, "_target") && this.targetChange();
        DataSystem.watch(BattleData, "_deleteMonster") && this.deleteMonster();
        this.setGlass();
    }
    /** 当怪物发生变化时 */
    private onMonsterChange(): void {
        if (this.data._target != -1 && this.lastMonsterID != -1) {
            for (let i = 0; i < this.data._monsters.length; i++) {
                if (this.lastMonsterID == this.data._monsters[i].data._id) {
                    this.data._target = i;
                    return;
                }
            }
            this.data._target = -1;
            this.lastMonsterID = -1;
        }
    }
    /**强制目标改变 */
    private targetChange(): void {
        if (this.data._target != -1) {
            this.fouceTarget = this.data._monsters[this.data._target].node;
            this.lastMonsterID = this.data._monsters[this.data._target].data._id;
        } else {
            this.fouceTarget = null;
        }
    }
    /**设置瞄准镜 */
    private setGlass(): void {
        if (this.fouceTarget) {
            this.sightGlass.position = this.fouceTarget.position.clone().add(v3(0, this.fouceTarget.getComponent(UITransform).height * this.fouceTarget.scale.y / 2, 0));
        } else {
            this.sightGlass.position = v3(1000, 1000, 0);
        }
    }
    /**删除怪物 */
    private deleteMonster(): void {
        if (this.fouceTarget && (!this.fouceTarget.getComponent(Monster).data || this.data._deleteMonster.indexOf(this.fouceTarget.getComponent(Monster).data._id) != -1)) {
            this.data._target = -1;
            this.fouceTarget = null;
        }
    }
}