<Grid x:Name="LayoutRoot" HorizontalAlignment="Left" VerticalAlignment="Top">
<Image HorizontalAlignment="Left" Source="Randar.png" Width="600" Height="600" Name="image1" Stretch="Fill" VerticalAlignment="Top" />
<Canvas Margin="300 300 0 0" Name="layRoot">
<Line X1="0" Y1="0" X2="252" Y2="0" StrokeThickness="1" RenderTransformOrigin="0.0,0.0" Stroke="#ffffffff" Fill="#ffffffff"></Line>
<Rectangle x:Name="rectangle" Height="60" Width="253" RenderTransformOrigin="0.0,0.0">
<Rectangle.Fill>
<LinearGradientBrush EndPoint="0.5,1" MappingMode="RelativeToBoundingBox" StartPoint="0.5,0">
<LinearGradientBrush.RelativeTransform>
<CompositeTransform CenterY="0.5" CenterX="0.5" Rotation="39.2"/>
</LinearGradientBrush.RelativeTransform>
<GradientStop Color="#8Dffffff"/>
<GradientStop Color="#00ffffff" Offset="0.483"/>
<GradientStop Color="Transparent" Offset="1"/>
</LinearGradientBrush>
</Rectangle.Fill>
</Rectangle>
</Canvas>
</Grid>

</UserControl>

namespace SLRandar
{
public partial class MainPage : UserControl
{
public MainPage()
{
InitializeComponent();

AddCanvasTransform();
}
public void AddCanvasTransform()
{
#region 为Canvas添加一个二维 x-y 坐标系内围绕指定点顺时针旋转对象
RotateTransform rTransform = new RotateTransform();
//设置旋转的初始角度为360度
rTransform.Angle = 360;
//设置旋转对象的名称属性为rTrans，让下面的DoubleAnimation使用
rTransform.SetValue(NameProperty, "rTrans");
//将此旋转对象给Canvas
this.layRoot.RenderTransform = rTransform;
#endregion

#region 设置动画板且让Canvas对象内的物品以某点位圆心360度旋转下去
//设置一个DoubleAnimation动画来翻转这个旋转对象。
Storyboard sboard = new Storyboard();
DoubleAnimation danima = new DoubleAnimation();//设置rectangle1矩形控件的透明度的Double类型数字变化
//设置DoubleAnimation动画的作用对象名称和作用对象属性
danima.SetValue(Storyboard.TargetNameProperty, "rTrans");
danima.SetValue(Storyboard.TargetPropertyProperty, new PropertyPath("RotateTransform.Angle"));
//在10秒的时间内让动画作用的角度属性从360到0，且永远循环下去
danima.From = 360; danima.To = 0;
danima.Duration = new Duration(new TimeSpan(0, 0, 10));
danima.RepeatBehavior = RepeatBehavior.Forever;
sboard.Children.Add(danima);
LayoutRoot.Resources.Add("colorboard", sboard);
sboard.Begin();
#endregion
}
}
}