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timer too slow... why? Messages   Related Types This message was discovered on microsoft.public.dotnet.languages.csharp. Post a new message to this list... Diego_Atos I've create a "stupid" animation. A simple label that bounce on borders of my form. Motion is ruled by a timer that set the timing of every steps. If I set the interval at "1000" it works properly, howevery if i set it at "10" or less, it warks slower than it would be. Anyone can help me? Excuse my bad english Thanks -- -Diego (Atos)- -L'uomo è superiore agli animali- -Fanno eccezione il nano e la giraffa- -A.Bergonzoni- -Per rispondere in privato potare "POTA" dall'indirizzo- Reply to this message...        George Neuner On Sat, 11 Sep 2004 12:11:00 GMT, Diego_Atos <Click here to reveal e-mail address> wrote: [Original message clipped] The timer is accurate only to 1/18 of a second (about 55 ms) - trying to set it lower is useless. This limitation is specified in the docs for the timer class. Non managed timers have the same limitation - they are all run from the system heartbeat clock. For fine animation you have to use multimedia timers or, as some others have suggested, a separate thread. George -- for email reply remove "/" from address Reply to this message...        Diego_Atos Risposta a: George Neuner (gneuner2/@comcast.net) _________________ [Original message clipped] thanks -- -Diego (Atos)- -L'uomo è superiore agli animali- -Fanno eccezione il nano e la giraffa- -A.Bergonzoni- -Per rispondere in privato potare "POTA" dall'indirizzo- Reply to this message...        Morten Wennevik Hi Diego, The timer event is not guaranteed to execute. If your program is busy the timer event might not get time to execute before another timer event is sent. The first waiting event is then cancelled. In effect setting timer to 10 might not seem any faster than setting it to 100. Dropped timer event is affected by your processor speed, how busy your program is, and how long it takes to execute the timer event code. -- Happy coding! Morten Wennevik [C# MVP] Reply to this message...        Diego_Atos Risposta a: Morten Wennevik (Click here to reveal e-mail address) _________________ [Original message clipped] i know this, but how can i really set the speed of my motion? -- -Diego (Atos)- -L'uomo è superiore agli animali- -Fanno eccezione il nano e la giraffa- -A.Bergonzoni- -Per rispondere in privato potare "POTA" dall'indirizzo- Reply to this message...        Niki Estner "Diego_Atos" <Click here to reveal e-mail address> wrote in news:Click here to reveal e-mail address... [Original message clipped] speed = distance / time If you can't lower the time, increase the distance. The human eye isn't capable of recognizing more than about 25 images per second, so a timer setting of about 40 is well enough. Move your label by a greater distance per timer tick. Niki Reply to this message...        Diego_Atos Risposta a: Niki Estner (Click here to reveal e-mail address) _________________ [Original message clipped] increasing the distance makes a non fluid animation. the label would jump from a point to another. Ciao -- -Diego (Atos)- -L'uomo è superiore agli animali- -Fanno eccezione il nano e la giraffa- -A.Bergonzoni- -Per rispondere in privato potare "POTA" dall'indirizzo- Reply to this message...        Niki Estner "Diego_Atos" <Click here to reveal e-mail address> wrote in news:Click here to reveal e-mail address... [Original message clipped] Did you measure how much time elapses between two ticks? Do you use that time as a factor in your motion equation? Niki Reply to this message...        Diego_Atos Risposta a: Niki Estner (Click here to reveal e-mail address) _________________ [Original message clipped] yes. if i set it at, for exemple, 6000, elapsed time is correct (6 secs) less than 100 it doesn't work properly. It's a process priority problem, that a cannot solve. [Original message clipped] yes. Every tick, i increase the coordinates -- -Diego (Atos)- -L'uomo è superiore agli animali- -Fanno eccezione il nano e la giraffa- -A.Bergonzoni- -Per rispondere in privato potare "POTA" dall'indirizzo- Reply to this message...        Niki Estner "Diego_Atos" <Click here to reveal e-mail address> wrote in news:Click here to reveal e-mail address... [Original message clipped] That's a misunderstanding about how it's supposed to work. The elapsed time you specify is the *minimum* time. [Original message clipped] That is, do you have a formula like this (pseudocode): Position += speed * (CurrentTime - OldTime); OldTime = CurrentTime; Also, if I got you, you're moving a Windows.Forms - Label control? Do you ensure it gets redrawn immediately? Changing the position does not neccessarily redraw it that instant. Usually 50-100 ms is enough for a fluid animation, however if you find you really need higher frame rates, consider running a loop instead of using timers at all; This will burn CPU power, but it'll be as fast as it gets. Niki Reply to this message...        Morten Wennevik On Sat, 11 Sep 2004 14:25:52 GMT, Diego_Atos <Click here to reveal e-mail address> wrote: [Original message clipped] Maybe do the animation in a separate thread, or animate according to time span between last "frame" and current time. -- Happy coding! Morten Wennevik [C# MVP] Reply to this message...        Richard Blewett If you are doing "real" animation then you may be better off using DirectX (it has a managed wrapper) rather than a timer. The problem with timer events from a synchronized System.Timers.Timer is that if the UI thread is busy doing something else (processing another event) then the timer cannot execute its callback on the UI thread and eventually, if the UI thread is very busy, you'll end up with a whole slew of callbacks queued so when teh UI thread becomes free you will get a sudden rush of activity. In other words the motion of your animation will be very jerky. Regards Richard Blewett - DevelopMentor http://staff.develop.com/richardb/weblog "Morten Wennevik" <Click here to reveal e-mail address> wrote in message news:opsd53ffxaklbvpo@stone... [Original message clipped] Reply to this message...        Richard Blewett Which timer class are you using? System.WIndows.Forms.Timer System.Threading.Timer System.Timers.Timer Regards Richard Blewett - DevelopMentor http://staff.develop.com/richardb/weblog "Diego_Atos" <Click here to reveal e-mail address> wrote in message news:Click here to reveal e-mail address... [Original message clipped] Reply to this message...        Diego_Atos Risposta a: Richard Blewett (Click here to reveal e-mail address) _________________ [Original message clipped] this -- -Diego (Atos)- -L'uomo è superiore agli animali- -Fanno eccezione il nano e la giraffa- -A.Bergonzoni- -Per rispondere in privato potare "POTA" dall'indirizzo- Reply to this message...     System.Threading.Timer System.Timers.Timer Ad MBR BootFX Best-of-breed application framework for .NET projects, developed by Matthew Baxter-Reynolds and MBR IT

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