当我使用XNA框架(用于Windows Phone)时,我的游戏运行得非常完美,但当我迁移到Silverlight / XNA框架时,我遇到了动画卡顿的问题。
问题如下: 当我将固定时间步长设置为GameTimer(timer.UpdateInterval = TimeSpan.FromTicks(333333))时,实际时间步长并不是固定的,并且计时器事件(OnUpdate,OnDraw)以不同的间隔触发。
以下代码更清晰地展示了我的问题:
银光/XNA框架(动画卡顿):
XNA框架:(一切正常):
问题如下: 当我将固定时间步长设置为GameTimer(timer.UpdateInterval = TimeSpan.FromTicks(333333))时,实际时间步长并不是固定的,并且计时器事件(OnUpdate,OnDraw)以不同的间隔触发。
以下代码更清晰地展示了我的问题:
银光/XNA框架(动画卡顿):
TimeSpan curNow;
TimeSpan lastUpdate;
TimeSpan lastDraw;
public GamePage()
{
timer = new GameTimer();
timer.UpdateInterval = TimeSpan.FromTicks(333333);
timer.Update += OnUpdate;
timer.Draw += OnDraw;
}
private void OnUpdate(object sender, GameTimerEventArgs e)
{
curNow = new TimeSpan(DateTime.Now.Ticks);
TimeSpan elapsed=e.ElapsedTime;//Always constant and has value: 33ms
TimeSpan realElapsed = curNow - lastUpdate;//Real elapsed time always changing and has a value between: 17-39ms (sometimes more then 39ms)
lastUpdate = curNow;
}
private void OnDraw(object sender, GameTimerEventArgs e)
{
curNow = new TimeSpan(DateTime.Now.Ticks);
TimeSpan elapsed=e.ElapsedTime;//Always changing and has a value between: 17-39ms (sometimes more then 39ms)
TimeSpan realElapsed = curNow -lastDraw;//Always changing and has a value between: 17-39ms (sometimes more then 39ms)
lastDraw= curNow;
}
XNA框架:(一切正常):
TimeSpan curNow;
TimeSpan lastUpdate;
TimeSpan lastDraw;
public Game()
{
// Frame rate is 30 fps by default for Windows Phone.
TargetElapsedTime = TimeSpan.FromTicks(333333);
}
protected override void Update(GameTime gameTime)
{
curNow = new TimeSpan(DateTime.Now.Ticks);
TimeSpan elapsed=gameTime.ElapsedGameTime;//Always constant and has value: 33ms
TimeSpan realElapsed = curNow - lastUpdate;//Real elapsed time has a value between: 34-35ms (sometimes more then 35ms)
lastUpdate = curNow;
}
protected override void Draw(GameTime gameTime)
{
curNow = new TimeSpan(DateTime.Now.Ticks);
TimeSpan elapsed=gameTime.ElapsedGameTime ;//Value between: 33-34ms (sometimes more then 34ms)
TimeSpan realElapsed = curNow - lastDraw;//Value between: 34-35ms (sometimes more then 35ms)
lastDraw = curNow;
}