airWar/airPlay/assets/Script/game/update/moveDest.ts

import { GameLogic } from "./GameLogic";


const {ccclass, property} = cc._decorator;

@ccclass
export default class MoveDest extends GameLogic {

    private _speed: number = 100;
    public get speed(): number {
        return this._speed;
    }
    public set speed(value: number) {
        this._speed = value;
    }

    private _destination: cc.Vec2 = cc.v2(0, 0);
    public get destination(): cc.Vec2 {
        return this._destination;
    }
    public set destination(value: cc.Vec2) {
        this._destination = value;
    }

    x_max: number;
    y_max: number;

    protected onLoad(): void {
        let parentSize = this.node.parent.getContentSize();
        let selfSize = this.node.getContentSize();

        this.x_max = (parentSize.width - selfSize.width)/2;
        this.y_max = (parentSize.height - selfSize.height)/2;
    }

    gameUpdate(dt: number): void {
        let offset = this.destination.sub(this.node.getPosition());
        if(offset.mag() <= this.speed * dt) {
            this.node.setPosition(this.destination);
        }
        else{
            let dirction = offset.normalize();
            this.node.x += this.speed * dt * dirction.x;
            this.node.y += this.speed * dt * dirction.y;
        }

        cc.log('@@ -- ', this.node.position.toString());
        this.node.x = Math.max(-this.x_max , this.node.x);
        this.node.x = Math.min(this.x_max , this.node.x);

        this.node.y = Math.max(-this.y_max , this.node.y);
        this.node.y = Math.min(this.y_max , this.node.y);
        
    }

    isDone(): boolean {
        return this.node.x == this._destination.x && this.node.y == this._destination.y;
    }
}