public partial class UCCircle : UserControl
{public UCCircle(double lineCount, double lineLenth, double centerX, double centerY)
{
InitializeComponent();//让img1图片控件具有MouseDragElementBehavior行为，且为让此控件在拖动过程中执行dragBehavior_Dragging事件。            dragBehavior.Attach(this.img1);
dragBehavior.Dragging += new MouseEventHandler(dragBehavior_Dragging);//设置img1可见，设置其初始位置。            img1.SetValue(Canvas.LeftProperty, centerX - 22.0);
img1.SetValue(Canvas.TopProperty, centerY - 22.0);
AddChirldren(lineCount, lineLenth, centerX, centerY);
}
MouseDragElementBehavior dragBehavior = new MouseDragElementBehavior();//放所有的线的集合        private List<ucLine> ucLineList = new List<ucLine>();private void AddChirldren(double lineCount, double lineLenth, double centerX, double centerY)
{//设置平均角度            double angle = 360.0 / lineCount;//设置线的起始点的坐标            for (int i = 0; i < lineCount; i++)
{
ucLine dline = new ucLine();//设置线的半径                dline.R = lineLenth;//设置线的起始点的坐标                dline.CenterX = centerX;
dline.CenterY = centerY;
XX = centerX;
YY = centerY;//设置这根线的角度                dline.AngleAll = angle * (i);
CanvasDevice.Children.Add(dline);//将所有的线添加到线集合中去，以供拖动过程中使用                ucLineList.Add(dline);
}
}/// <summary>/// 设置连接两个圈中心的线条/// </summary>        public void SetLinkLine(LinkLineModel lineModel)
{

if (lineModel.PointType == PoiType.StartPoint)
{
lineModel.LinkLine.X1 = XX;
lineModel.LinkLine.Y1 = YY;
}else
{
lineModel.LinkLine.X2 = XX;
lineModel.LinkLine.Y2 = YY;
}if (LinkLineList == null)
LinkLineList = new List<LinkLineModel>();
LinkLineList.Add(lineModel);

}/// <summary>/// 中心点连接线的列表/// </summary>        public List<LinkLineModel> LinkLineList { set; get; }

//移动后的中心点位置        public double XX { get; set; }public double YY { get; set; }

/// <summary>/// img1被拖动的时候触发的事件/// </summary>/// <param name="sender"></param>/// <param name="e"></param>        void dragBehavior_Dragging(object sender, MouseEventArgs e)
{
MouseDragElementBehavior dragBehavior2 = sender as MouseDragElementBehavior;//获取到控件被拖动后的位置坐标            double x1 = dragBehavior2.X + 22;double y1 = dragBehavior2.Y + 22;
XX = x1;
YY = y1;foreach (ucLine dline in ucLineList)
{//设置lineD线的起点坐标为移动后的坐标位置                dline.LineD.X1 = x1;
dline.LineD.Y1 = y1;
}

//设置起始点或者终结点的位置            foreach (LinkLineModel linemodel in LinkLineList)
{if (linemodel.PointType == PoiType.StartPoint)
{
linemodel.LinkLine.X1 = XX;
linemodel.LinkLine.Y1 = YY;
}else
{
linemodel.LinkLine.X2 = XX;
linemodel.LinkLine.Y2 = YY;
}
}

}
}

    <Grid x:Name="LayoutRoot" Background="White">
<Canvas x:Name="CanvasDevice" >

<Image x:Name="img1" Source="yellow.png" Width="44" Canvas.ZIndex="300" Height="44"></Image>
</Canvas>
</Grid>

    public class LinkLineModel
{/// <summary>/// 起点线还是终点线/// </summary>        public PoiType PointType { get; set; }

/// <summary>/// 线/// </summary>        public Line LinkLine { get; set; }

/// <summary>/// 线条名字/// </summary>        public string LineName { get; set; }
}

    /// <summary>/// 指定点的类型是起始点还是终结点/// </summary>    public enum PoiType
{
StartPoint,
EndPoint
}

    public partial class MainPage : UserControl
{public MainPage()
{
InitializeComponent();
CanvasDevice.Children.Clear();

//连接uc和uc1的线条            Line line = new Line();
line.Stroke = new SolidColorBrush(Color.FromArgb(255, 255, 0, 0));
line.AllowDrop = true;

//连接uc1和uc2的线条            Line line2 = new Line();
line2.Stroke = new SolidColorBrush(Color.FromArgb(255, 255, 0, 0));
line2.AllowDrop = true;

//声明三个圆心的图            UCCircle uc = new UCCircle(5, 100, 250, 150);
UCCircle uc1 = new UCCircle(6, 100, 160, 370);
UCCircle uc2 = new UCCircle(6, 100, 450, 400);

//设置线条一 在子控件中            uc.SetLinkLine(new LinkLineModel() { LinkLine= line, PointType= PoiType.StartPoint });
uc1.SetLinkLine(new LinkLineModel() { LinkLine = line, PointType = PoiType.EndPoint });

//设置线条二 在子控件中            uc1.SetLinkLine(new LinkLineModel() { LinkLine = line2, PointType = PoiType.StartPoint });
uc2.SetLinkLine(new LinkLineModel() { LinkLine = line2, PointType = PoiType.EndPoint });

//将线条和子空间添加到Canvas中            CanvasDevice.Children.Add(line);
CanvasDevice.Children.Add(line2);
CanvasDevice.Children.Add(uc);
CanvasDevice.Children.Add(uc1);
CanvasDevice.Children.Add(uc2);
}
}