游戏开发中的设计模式

单例模式

实例化单一对象，懒加载

//单例模式
class GameManagerSingleton
{private constructor(){}private static instance:GameManagerSingleton;public static Instance(){if(!GameManagerSingleton.instance){this.instance = new GameManagerSingleton();}return this.instance;}Init(){}}GameManagerSingleton.Instance().Init();

代理模式

根据不同的代理者，具体化实际方法操作

//代理模式
interface ICall
{DealNum(x1:number,x2:number):number;
}class NPC1 implements ICall
{DealNum(x1: number, x2: number): number {return x1 + x2;}
}class NPC2 implements ICall
{DealNum(x1: number, x2: number): number {return x1 - x2;}
}class Person
{public delegate : ICall;public DealNum(x1,x2) : number{let retNum = this.delegate.DealNum(x1,x2);return retNum;}
}

观察者模式

设置观察者后，对象的变更会告知观察者

//观察者模式
interface IObserver
{nameChanged(newName);
}class Test implements IObserver
{//捕捉变化nameChanged(newName : string) {console.log("NewName:"+newName)}
}class People
{private name : string;/****/constructor() {this.name = ""}public get Name(){return this.name;}public set Name(value){if(this.name != value){this.name = value;//发生变化会向观察者发消息for(let observer of this.Observers){observer.nameChanged(this.name);}}}Observers : Array<IObserver> = new Array<IObserver>();
}let People1 = new People()
let observer1  = new Test()
//设置观察者
People1.Observers.push(observer1)
//改变对象
People1.Name = "Tom"

工厂模式

游戏中构建item群体的常用模式

enum CarType
{BMW,Benz,Audi,
}class Car 
{name : string;static CreateCar(type :  CarType){switch(type){case CarType.BMW:return new BMW();case CarType.Benz:return new Benz();}}
}class BMW extends Car
{/****/constructor() {super();this.name = "BMW"}
}
class Benz extends Car
{/****/constructor() {super();this.name = "Benz"}
}Car.CreateCar(CarType.Benz)
Car.CreateCar(CarType.BMW)