Question

我是XNA C＃中的新手，我想知道如何在XNA C＃中创建一个在几秒钟后执行某些操作的计时器。

我见过a Flash tutorial做了我需要但我不知道怎么做XNA C＃

我正在尝试使用计时器在我的项目的某个时期制作一个闪烁的模型。因此，我需要知道如何启动计时器以及计时器如何切换模型的闪烁。

感谢。

Answer 1

我就是这样做的......

我有一个触发器行为的基类，并且我有一个继承自Trigger的Timer ...

    //---------------------------------------------------------------------------------------------------------------------
    public class TriggerArgs
    {
        public AstroObject obj;
    }

    //---------------------------------------------------------------------------------------------------------------------
    public delegate void FireAction( AstroObject sender, TriggerArgs args );

    //---------------------------------------------------------------------------------------------------------------------
    public interface IFireable
    {
        void Fire( AstroObject sender, TriggerArgs args );
    }

    //---------------------------------------------------------------------------------------------------------------------
    //---------------------------------------------------------------------------------------------------------------------
    public abstract class Trigger : AstroObject
    {
        public Action Fired;

        public List<FireAction> Actions;
        protected abstract void CheckConditions( float Seconds );
        protected bool IsFired;

        public bool RearmOnFire = false;

        //---------------------------------------------------------------------------------------------------------------------
        protected override void LocalCreate( out int UpdateOrder )
        {
            UpdateOrder = Orders.Update.Trigger;
            IsFired = false;
        }

        //---------------------------------------------------------------------------------------------------------------------
        protected override void LocalDie( ) { }

        //---------------------------------------------------------------------------------------------------------------------
        public sealed override void Update( float Seconds )
        {
            CheckConditions( Seconds );
        }

        //---------------------------------------------------------------------------------------------------------------------
        protected void Fire( TriggerArgs args )
        {
            if ( IsFired ) return;

            foreach ( FireAction f in Actions ) f.Invoke( this, args );

            if ( Fired != null ) Fired( );

            IsFired = !RearmOnFire;
        }

        //---------------------------------------------------------------------------------------------------------------------
        public override void Render( Microsoft.Xna.Framework.Color color ) { }
    }

    //---------------------------------------------------------------------------------------------------------------------
    //---------------------------------------------------------------------------------------------------------------------
    public class TimeTrigger : Trigger
    {
        public float Interval;
        public float Elapsed;

        //---------------------------------------------------------------------------------------------------------------------
        protected override void LocalCreate( out int UpdateOrder )
        {
            base.LocalCreate( out UpdateOrder );
            Elapsed = Interval;
        }

        //---------------------------------------------------------------------------------------------------------------------
        public void Start( ) { Elapsed = Interval; IsFired = false; }

        //---------------------------------------------------------------------------------------------------------------------
        protected override void CheckConditions( float Seconds )
        {
            if ( IsFired ) return;

            Elapsed -= Seconds;

            if ( Elapsed <= 0 )
            {
                Elapsed = Interval;
                Fire( null );
            }
        }
    }

Answer 2

在更新

中执行以下操作

float elapsedTime = (float)gameTime.ElapsedGameTime.TotalSeconds;

然后有一个像

这样的秒的变量

float timer = 5.0f; // Five seconds

然后在更新

timer -= elapsedTime

if(timer <= 0)
{
    // Hanlde the blink here
    timer = 5.0f; // Reset timer
}

如何创建一个做某事的Timer？

2 个答案: