Combining transforms into TransformGroup

Question

Hi all I want to apply a series of transforms to a canvas. The transforms consist of scales rotates and translates. They will to have be applied dynamically and in a random order. For instance: a canvas is translated but next it will have to be rotated around a certain center scaled around a center rotated again translated again ... I used a transformgroup and because I know that the order of transforms is important I added them to the transformgroup in a way the first in the group are all the scales next the rotates and finally the translates. This works well for a while but after a certain time a get performance problems when there are too many transforms in the group. Is there a way to overcome this? Thx al lot Maarten

Patrick Klitzke · Answer

Hello Maarten The performance issue could have to do with several things. First: Do you use Canvas.Rendertransform or Canvas.LayoutTransform? Layouttransform causes the Application the call an entire Layoutprocess which takes much more time than Rendertransform. But I think your problem is that you may call all the functions in the loop. This is critical since the transformation has not been finished before a other transformation is called. I would reccomand to use the class DispatcherTimer from System.Windows.Threading: DispatcherTimer dispatcherTimer = new DispatcherTimer(); //give Ticker values dispatcherTimer.Tick += new EventHandler(NextAnimation); // do Transformation every 10 milisecond dispatcherTimer.Interval = new TimeSpan(0 000 100); The Dispatcherclass has a eventhandler Toick which throws an event every Interval. In this event Handler you can call your animation. I have created a small example Application for you: http://www.pklitzke.com/Schooldata/MyTransform.zip