WPF在画布上的itemscontrol元素之间绘制线条

<ItemsControl>
    <ItemsControl.ItemsPanel>
        <ItemsPanelTemplate>
            <Canvas/>
        </ItemsPanelTemplate>
    </ItemsControl.ItemsPanel>
    <ItemsControl.ItemContainerStyle>
        <Style TargetType="ContentPresenter">
            <Setter Property="Canvas.Left" Value="{Binding X}"/>
            <Setter Property="Canvas.Top" Value="{Binding Y}"/>
        </Style>
    </ItemsControl.ItemContainerStyle>
    <ItemsControl.ItemTemplate>
        <DataTemplate>
            <Ellipse Width="10" Height="10" Fill="Red"/>
        </DataTemplate>
    </ItemsControl.ItemTemplate>
    <ItemsControl.ItemContainerStyle>
        <Style TargetType="ContentPresenter">
            <Setter Property="Canvas.Left" Value="{Binding X}"/>
            <Setter Property="Canvas.Top" Value="{Binding Y}"/>
        </Style>
    </ItemsControl.ItemContainerStyle>
    <ItemsControl.ItemTemplate>
        <DataTemplate>
            <Ellipse Width="10" Height="10" Fill="Red"/>
        </DataTemplate>
    </ItemsControl.ItemTemplate>
    <ItemsControl.ItemTemplate>
        <DataTemplate>
            <Path Stroke="Black" StrokeThickness="1">
                <Path.Data>
                    <PathGeometry>
                        <PathFigure StartPoint="{Binding StartPoint}">
                            <PolyLineSegment Points="{Binding Points}"/>
                        </PathFigure>
                    </PathGeometry>
                </Path.Data>
            </Path>
        </DataTemplate>
    </ItemsControl.ItemTemplate>
</ItemsControl>