Silverlight里C#绘制Path的方法

以下是C#代码

CODE:C# Code

using System; 
using System.Collections.Generic; 
using System.Linq; 
using System.Net; 
using System.Windows; 
using System.Windows.Controls; 
using System.Windows.Documents; 
using System.Windows.Input; 
using System.Windows.Media; 
using System.Windows.Media.Animation; 
using System.Windows.Shapes; 

namespace slArrow 
{ 
    public partial class Page : UserControl 
    { 
        public Page() 
        { 
            InitializeComponent(); 
            LayoutRoot.Loaded += new RoutedEventHandler(LayoutRoot_Loaded); 
        } 

        void LayoutRoot_Loaded(object sender,RoutedEventArgs e) 
        { 
            drawArrow(new Point(300,300)); 
        } 

        public void drawArrow(Point endP) 
        { 
            double slopy; 
            double cosy; 
            double siny; 
            double Par = 8.0; 
            //slopy = Math.atan2((StartP.y-endP.y+20),(StartP.x-endP.x)); 
            slopy=3.1415926; 
            cosy = Math.Cos(slopy); 
            siny = Math.Sin(slopy); 

            PathGeometry aPathGeometry = new PathGeometry(); 
            arrowPath.Data = aPathGeometry; 

            aPathGeometry.figures = new PathfigureCollection(); 

            Pathfigure aPathfigure = new Pathfigure(); 

            aPathfigure.StartPoint = endP; 

            Linesegment Line1 = new Linesegment(); 
            Linesegment Line2 = new Linesegment(); 
            Linesegment Line3 = new Linesegment(); 

            Point p1 = new Point(); 
            Point p2 = new Point(); 
            Point p3 = new Point(); 

            p1.X = endP.X + ( Par * cosy - ( Par / 2.0 * siny ) ); 
            p1.Y = endP.Y + ( Par * siny + ( Par / 2.0 * cosy ) ); 

            p2.X = endP.X + ( Par * cosy + Par / 2.0 * siny ); 
            p2.Y = endP.Y - ( Par / 2.0 * cosy - Par * siny ); 

            p3.X = endP.X; 
            p3.Y = endP.Y; 

            Line1.Point = p1; 
            Line2.Point = p2; 
            Line3.Point = p3; 

            aPathfigure.Segments.Add(Line1); 
            aPathfigure.Segments.Add(Line2); 
            aPathfigure.Segments.Add(Line3); 

            aPathGeometry.figures.Add(aPathfigure); 
        } 
    } 
}

以下代码放在XAML文档里边

CODE:XAML Code

<UserControl x:Class="slArrow.Page" 
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" 
    Width="400" Height="300"> 
    <Grid x:Name="LayoutRoot" Background="White"> 
        <Path x:Name="arrowPath" stroke="Red" strokeThickness="4"/>        
    </Grid> 
</UserControl>