It is definitely the animation(s). I can leave my timer loop in place with no animations and the cpu usage is negligible.
I tried to diagnose whether it was the specific property (ScaleX vs Opacity) but removing one or the other didn't help. Thanks for the code, I'll check it out. From: John OBrien [mailto:[email protected]] Sent: Monday, 21 September 2009 2:14 PM To: [email protected] Subject: RE: animation cpu usage Double check your windowless property like Miguel mentioned, also I had an issue with the Implicitstylemanager firing continuously in one app, had to set it to runonce. I guess the first thing is to identify that indeed it is your animation causing the CPU usage. This is my quick sprite code if you need it in Silverlight2, Jose mentioned that in SL3 this is now achievable in XAML only, from memory there is now an instant easing property. XAML: <UserControl x:Class="WebCameraMap.controls.Sprite" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"; xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml";> <Grid x:Name="LayoutRoot"> </Grid> </UserControl> CODE: using System; using System.Windows; using System.Windows.Media; using System.Windows.Media.Animation; using System.Windows.Shapes; namespace WebCameraMap.controls { public partial class Sprite : IDisposable { private Storyboard sb; public Sprite() { InitializeComponent(); Loaded += Sprite_Loaded; } public int Frames { get; set; } public int MilliSecondsPerFrame { get; set; } public ImageSource ImageSource { get; set; } private void Sprite_Loaded(object sender, RoutedEventArgs e) { Begin(); } private void Begin() { var element = new Rectangle { Width = Width, Height = Height }; var spriteSheet = new ImageBrush { Stretch = Stretch.None, AlignmentX = AlignmentX.Left, AlignmentY = AlignmentY.Top }; var sprite_sheet_position = new TranslateTransform(); spriteSheet.Transform = sprite_sheet_position; spriteSheet.ImageSource = ImageSource; element.Fill = spriteSheet; var sprite_anim = new DoubleAnimationUsingKeyFrames(); for (int i = 0; i < Frames; i++) { var frame_span = new TimeSpan(0, 0, 0, 0, i*MilliSecondsPerFrame); sprite_anim.KeyFrames.Add(new DiscreteDoubleKeyFrame { Value = (-Width*((Frames-i)-1)), KeyTime = KeyTime.FromTimeSpan(frame_span) }); } sb = new Storyboard {RepeatBehavior = RepeatBehavior.Forever}; sb.Children.Add(sprite_anim); Storyboard.SetTarget(sprite_anim, sprite_sheet_position); Storyboard.SetTargetProperty(sprite_anim, new PropertyPath(TranslateTransform.XProperty)); sb.Begin(); LayoutRoot.Children.Add(element); } public void Dispose() { if (sb !=null) { sb.Stop(); sb = null; } } } } From: [email protected] [mailto:[email protected]] On Behalf Of Ross Jempson Sent: Monday, 21 September 2009 2:00 PM To: [email protected] Subject: RE: animation cpu usage Thanks John. I can't see it on his blog but I understand the concept. In my case, I should create an image that is twice as wide as the original, and then show/hide the relevant part of the image by animating the X of a translatetransform. From: John OBrien [mailto:[email protected]] Sent: Monday, 21 September 2009 1:43 PM To: [email protected] Subject: RE: animation cpu usage Ross, I used Jose Fajardo's sprite concept from Remix to change a high cpu repeating animation to a simple sprite (set of frames in one image, repeating animation is just translate x). It may not be ideal but for me it took the animation down to 1-2% cpu. His blog is here, but I'm not sure if he ever posted about it: http://www.cynergysystems.com/blogs/page/josefajardo John. From: [email protected] [mailto:[email protected]] On Behalf Of Ross Jempson Sent: Monday, 21 September 2009 12:06 PM To: [email protected] Subject: animation cpu usage Hi there, This is an old question I posted when the list was down. Does anyone have any suggestions as to how I can minimise cpu usage when using a storyboard/animation(s) that repeat constantly. To explain the scenario, I have a screen that has a background that sort of looks like a night sky. There are say 100 little stars (the same png scattered around with various sizes). I animate the opacity / ScaleX / ScaleY of a random png every 1 second to create a twinkling effect that keeps running the whole time you view the screen. The effect is very nice, however I notice it hogs the cpu. I have tried 2 implementations. In the first implementation I created a storyboard with 3 animations. I created a timer that fired every 1 second, and on the fly set the animations to target one of the pngs randomly (stopping and starting the storyboard each time). This was consuming on average 80% of my CPU. I created a second implementation to see if I could improve the situation. In the second implementation I decided to build up the storyboard in code up front. I create 40 animations up front targeting random pngs, each with a begintime 1 second later than the previous and add them all to the one master storyboard. I then just run that storyboard over and over. However, this approach made no difference to the cpu being consumed. Cheers. ______________________________________________________________________ This email has been scanned by the MessageLabs Email Security System. For more information please visit http://www.messagelabs.com/email ______________________________________________________________________ ______________________________________________________________________ This email has been scanned by the MessageLabs Email Security System. For more information please visit http://www.messagelabs.com/email ______________________________________________________________________
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