import { Component, v3, _decorator, Node } from "cc";


const { ccclass, property, executeInEditMode } = _decorator;

/**
 * 跟随脚本，挂载被跟随的节点上
 */
@ccclass
@executeInEditMode
export class Follow extends Component {

    //需要跟随的目标节点数组
    @property(Node)
    private targets: Node[] = [];

    _pos = v3();

    _isPause = false;

    protected update(dt: number): void {
        this._pos = this.node.position;
    }

    protected lateUpdate(dt: number): void {
        if (!this._isPause) {
            this.move()
        }
    }

    setTargets(targets: Node[]) {
        this.targets = targets;
    }

    pause() {
        this._isPause = true;
    }

    resume() {
        this._isPause = false;
    }

    move() {
        let p = this.node.position;
        for (let i = 0; i < this.targets.length; i++) {
            let t = this.targets[i].position;
            t.add3f(p.x - this._pos.x, p.y - this._pos.y, p.z - this._pos.z);
            this.targets[i].position = t;
        }
    }
}