WPF获取相对位置、坐标的方法

1.获取鼠标在控件中的坐标：

 private void item_MouseDown(object sender, MouseButtonEventArgs e)
 {
         Point point = e.GetPosition(lbl);   

  }

 //或者直接使用Mouse类的静态方法GetPosition(),
 //需要注意的是参数为IInputElement类型，也就是说要是能输入的控件
 Point point2 = Mouse.GetPosition(lbl2);
 lbl2.Content = "(" + point2.X + ", " + point2.Y + ")";

完整例子代码：

XAML代码

 <Window x:Class="WpfGetPointDemo.MainWindow"
         xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
         xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
         Title="MainWindow" Height="350" Width="525">
     <Grid x:Name="grid" MouseDown="item_MouseDown">
         <Label Background="Red" x:Name="lbl" Margin="293.855,59.398,66.145,77.319"/>
         <Label Background="GreenYellow" x:Name="lbl2" Margin="29.488,59.398,327.512,69.969"/>
         <Label Background="blue" x:Name="lbl3" HorizontalAlignment="Left" Margin="133.048,268.187,0,0" VerticalAlignment="Top" Width="250.952" Height="51.813"/>
         <Button x:Name="btn" HorizontalAlignment="Left" Margin="177.325,10,0,0" VerticalAlignment="Top" Width="135.09" RenderTransformOrigin="0.012,0.547" Height="43.252"/>
     </Grid>
 </Window>

后台C#代码

 using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Text;
 using System.Windows;
 using System.Windows.Controls;
 using System.Windows.Data;
 using System.Windows.Documents;
 using System.Windows.Input;
 using System.Windows.Media;
 using System.Windows.Media.Imaging;
 using System.Windows.Navigation;
 using System.Windows.Shapes;

 namespace WpfGetPointDemo
 {
     /// <summary>
     /// Interaction logic for MainWindow.xaml
     /// </summary>
     public partial class MainWindow : Window
     {
         public MainWindow()
         {
             InitializeComponent();
         }

         private void item_MouseDown(object sender, MouseButtonEventArgs e)
         {
             Point point = e.GetPosition(lbl);
             lbl.Content = "("+point.X+", "+point.Y+")";

             Point point2 = Mouse.GetPosition(lbl2);
             lbl2.Content = "(" + point2.X + ", " + point2.Y + ")";

             Point point3 = Mouse.GetPosition(grid);
             lbl3.Content = "(" + point3.X + ", " + point3.Y + ")";

             Point point4 = Mouse.GetPosition(btn);
             btn.Content = "(" + point4.X + ", " + point4.Y + ")";
         }
     }
 }

运行结果：

2.获取控件相对于两一个控件的坐标：

2.1. 直接使用  control1.TranslatePoint(new Point(), control2)

 Point point = rectangle.TranslatePoint(new Point(),canvas);
  

2.2.获取控件在Window中的坐标

 Window window =  Window.GetWindow(canvas);
 Point  point  =  canvas.TransformToAncestor(window).Transform(new Point(, ));  

引用：http://www.fengfly.com/plus/view-210427-1.html