public async ETTask <bool> WaitTillAsync(long tillTime, ETCancellationToken cancellationToken)
{
if (TimeHelper.Now() > tillTime)
{
return(true);
}
ETTaskCompletionSource <bool> tcs = new ETTaskCompletionSource <bool>();
OnceWaitTimer timer = EntityFactory.CreateWithParent <OnceWaitTimer, ETTaskCompletionSource <bool> >(this, tcs);
this.timers[timer.Id] = timer;
AddToTimeId(tillTime, timer.Id);
long instanceId = timer.InstanceId;
cancellationToken.Register(() =>
{
if (instanceId != timer.InstanceId)
{
return;
}
timer.Run(false);
this.Remove(timer.Id);
});
return(await tcs.Task);
}
// 开启协程移动,每100毫秒移动一次，并且协程取消的时候会计算玩家真实移动
// 比方说玩家移动了2500毫秒,玩家有新的目标,这时旧的移动协程结束,将计算250毫秒移动的位置，而不是300毫秒移动的位置
public async ETTask StartMove(ETCancellationToken cancellationToken)
{
Unit unit = this.GetParent <Unit>();
this.StartPos = unit.Position;
this.StartTime = TimeHelper.Now();
float distance = (this.Target - this.StartPos).magnitude;
if (Math.Abs(distance) < 0.1f)
{
return;
}
this.needTime = (long)(distance / this.Speed * 1000);
TimerComponent timerComponent = Game.Scene.GetComponent <TimerComponent>();
// 协程如果取消，将算出玩家的真实位置，赋值给玩家
cancellationToken.Register(() =>
{
long timeNow = TimeHelper.Now();
if (timeNow - this.StartTime >= this.needTime)
{
unit.Position = this.Target;
}
else
{
float amount = (timeNow - this.StartTime) * 1f / this.needTime;
unit.Position = Vector3.Lerp(this.StartPos, this.Target, amount);
}
});
while (true)
{
await timerComponent.WaitAsync(50, cancellationToken);
long timeNow = TimeHelper.Now();
if (timeNow - this.StartTime >= this.needTime)
{
unit.Position = this.Target;
break;
}
float amount = (timeNow - this.StartTime) * 1f / this.needTime;
unit.Position = Vector3.Lerp(this.StartPos, this.Target, amount);
}
}
public async ETTask MoveToAsync(Vector3 target, ETCancellationToken cancellationToken)
{
// 新目标点离旧目标点太近，不设置新的
if ((target - this.Target).sqrMagnitude < 0.01f)
{
return;
}
// 距离当前位置太近
if ((this.GetParent <Unit>().Position - target).sqrMagnitude < 0.01f)
{
return;
}
this.Target = target;
// 开启协程移动
await StartMove(cancellationToken);
}