Cocos Creator觸摸屏幕任意位置節點跟隨手指移動

// Learn TypeScript:
//  - [Chinese] https://docs.cocos.com/creator/manual/zh/scripting/typescript.html
//  - [English] http://www.cocos2d-x.org/docs/creator/manual/en/scripting/typescript.html
// Learn Attribute:
//  - [Chinese] https://docs.cocos.com/creator/manual/zh/scripting/reference/attributes.html
//  - [English] http://www.cocos2d-x.org/docs/creator/manual/en/scripting/reference/attributes.html
// Learn life-cycle callbacks:
//  - [Chinese] https://docs.cocos.com/creator/manual/zh/scripting/life-cycle-callbacks.html
//  - [English] http://www.cocos2d-x.org/docs/creator/manual/en/scripting/life-cycle-callbacks.html

const { ccclass, property } = cc._decorator;

@ccclass
export default class NewClass extends cc.Component {

    // this.node 是需要移動的節點

    nodePos = null;
    onLoad() {
        //節點初始位置,每次觸摸結束更新
        this.nodePos = this.node.getPosition();
        //觸摸監聽(this.node.parent是屏幕)
        //想達到按住節點，節點才能移動的效果，將監聽函數註冊到 this.node 上，去掉  .parent 即可
        this.node.parent.on(cc.Node.EventType.TOUCH_MOVE, this.onTouchMove, this);
        this.node.parent.on(cc.Node.EventType.TOUCH_END, this.onTouchEnd, this);
        this.node.parent.on(cc.Node.EventType.TOUCH_CANCEL, this.onTouchCancel, this);
    }

    //觸摸移動；
    onTouchMove(event) {
        var self = this;
        var touches = event.getTouches();
        //觸摸剛開始的位置
        var oldPos = self.node.parent.convertToNodeSpaceAR(touches[0].getStartLocation());
        //觸摸時不斷變更的位置
        var newPos = self.node.parent.convertToNodeSpaceAR(touches[0].getLocation());

        //var subPos = cc.pSub(oldPos,newPos); 1.X版本是cc.pSub

        var subPos = oldPos.sub(newPos); // 2.X版本是 p1.sub(p2);

        self.node.x = self.nodePos.x - subPos.x;
        self.node.y = self.nodePos.y - subPos.y;

        // 控制節點移不出屏幕; 
        var minX = -self.node.parent.width / 2 + self.node.width / 2; //最小X座標；
        var maxX = Math.abs(minX);
        var minY = -self.node.parent.height / 2 + self.node.height / 2; //最小Y座標；
        var maxY = Math.abs(minY);


     

        var nPos = self.node.getPosition(); //節點實時座標；

        if (nPos.x < minX) {
            nPos.x = minX;
        };
        if (nPos.x > maxX) {
            nPos.x = maxX;
        };
        if (nPos.y < minY) {
            nPos.y = minY;
        };
        if (nPos.y > maxY) {
            nPos.y = maxY;
        };
        self.node.setPosition(nPos);
    }
    onTouchEnd() {
        this.nodePos = this.node.getPosition(); //獲取觸摸結束之後的node座標；
    }
    onTouchCancel() {
        this.nodePos = this.node.getPosition(); //獲取觸摸結束之後的node座標；
    }
}