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How to move the text throughout screen using RenderTransform(rotation transform) in wp7?

Here is my code , i am using rotation transform and i am getting text rotating in 360 degree but i want it to move over all the screen with constant speed. any one can help in this please?

void OnCompositionTargetRendering(object sender, EventArgs args)
{
    // Time-based
    TimeSpan elapsedTime = DateTime.Now - startTime;
    rotate.Angle = (elapsedTime.TotalMinutes * 360) % 360;

}

使用CompositeTransform,您可以在其中指定旋转和平移

//use layout transform not rendertransform

//for example
<Border BorderThickness="1" BorderBrush="Black" Width="200" Height="20" LayoutTransform="{StaticResource Rotate}">

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