WPF在樣式定義和UI動畫上面相對於以前的技術有了不少的提升，下面給出WPF技術實現鐘表的效果：

1、Visual Studio新建一個WPF應用程序，命名為WpfClock，新建一個images文件夾，並準備一個鐘表的背景圖片和程序圖標素材。

2、編輯MainWindow.xaml文件，對UI進行定制，代碼如下(指針都是用Rectangle實現的，當然可以用圖片代替)：

 1 <Window x:Class="WpfClock.MainWindow"
 2         xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
 

 3         xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
 4         Title="MainWindow" Margin="2" Height="327" Width="311" AllowsTransparency="True" 
 5         WindowStyle="None" Background="Transparent" WindowStartupLocation="CenterScreen" 
 6         Icon="images/clock.ico" 
 7         ResizeMode
 
="NoResize" Topmost="False" Opacity="1">
 8         <Grid Width="300" Height="300" MouseLeftButtonDown="Grid_MouseLeftButtonDown">
 9         <Image Source="images/backGround.png"></Image>
10 
11         <Label Name="lab商標" Foreground="White" Margin="0,0,0,211" HorizontalAlignment="Center"
 
 VerticalAlignment="Bottom" Height="Auto" Width="Auto" FontSize="13" >JackMoon</Label>
12         <Label Name="lab創建時間" Foreground="White" Margin="0,91,0,0" HorizontalAlignment="Center" VerticalAlignment="Top" Height="Auto" Width="Auto">1987</Label>
13 
14         <!-- 秒針定義  -->
15         <Rectangle Margin="150,0,149,150" Name="rectangleSecond" Stroke="White" Height="120" VerticalAlignment="Bottom" Width="1">
16             <Rectangle.RenderTransform>
17                 <RotateTransform x:Name="secondPointer" CenterX="0" CenterY="120" Angle="0" />
18             </Rectangle.RenderTransform>
19         </Rectangle>
20         <!-- -->
21 
22         <!-- 分鐘定義  -->
23         <Rectangle Margin="150,49,149,151" Name="rectangleMinute" Stroke="LightGreen" Width="1">
24             <Rectangle.RenderTransform>
25                 <RotateTransform x:Name="minutePointer" CenterX="0" CenterY="100" Angle="45" />
26             </Rectangle.RenderTransform>
27         </Rectangle>
28         <!-- -->
29 
30         <!-- 時針定義  -->
31         <Rectangle Margin="150,80,149,150" Name="rectangleHour" Stroke="LightYellow" Width="1">
32             <Rectangle.RenderTransform>
33                 <RotateTransform x:Name="hourPointer" CenterX="0" CenterY="70" Angle="90" />
34             </Rectangle.RenderTransform>
35         </Rectangle>
36         <!---->
37          <Label Content="08:08:08" FontSize="16" Foreground="White" Height="Auto" HorizontalAlignment="Center" Margin="114,0,113,86" Name="labTime" VerticalAlignment="Bottom" Width="Auto" />
38 
39     </Grid>
40 </Window>

3、編輯MainWindow.xaml.CS文件，對後臺邏輯進行定制，代碼如下：

 1 using System;
 2 using System.Collections.Generic;
 3 using System.Linq;
 4 using System.Text;
 5 using System.Windows;
 6 using System.Windows.Controls;
 7 using System.Windows.Data;
 8 using System.Windows.Documents;
 9 using System.Windows.Input;
10 using System.Windows.Media;
11 using System.Windows.Media.Imaging;
12 using System.Windows.Navigation;
13 using System.Windows.Shapes;
14 namespace WpfClock
15 {
16     using System.Threading;
17     using System.Windows.Threading;
18     /// <summary>
19     /// MainWindow.xaml 的交互邏輯
20     /// </summary>
21     public partial class MainWindow : Window
22     {
23         //計時器
24         System.Timers.Timer timer = new System.Timers.Timer(1000);
25         public MainWindow()
26         {
27             InitializeComponent();
28             #region 初始化時間
29             secondPointer.Angle = DateTime.Now.Second * 6;
30             minutePointer.Angle = DateTime.Now.Minute * 6;
31             hourPointer.Angle = (DateTime.Now.Hour * 30) + (DateTime.Now.Minute * 0.5);
32             this.labTime.Content = DateTime.Now.ToString("HH:mm:ss");
33             #endregion
34             timer.Elapsed += new System.Timers.ElapsedEventHandler(timer_Elapsed);
35             timer.Enabled = true;
36         }
37 
38         private void Grid_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)
39         {
40             //進行拖放移動
41             this.DragMove();
42         }
43        private void timer_Elapsed(object sender, System.Timers.ElapsedEventArgs e)
44         {
45            //UI異步更新
46             this.Dispatcher.Invoke(DispatcherPriority.Normal, (Action)(() =>
47             {
48                 //秒針轉動,秒針繞一圈360度，共60秒，所以1秒轉動6度
49                 secondPointer.Angle = DateTime.Now.Second * 6;
50                 //分針轉動,分針繞一圈360度，共60分，所以1分轉動6度
51                 minutePointer.Angle = DateTime.Now.Minute * 6;
52                 //時針轉動,時針繞一圈360度，共12時，所以1時轉動30度。
53                 //另外同一個小時內，隨著分鐘數的變化(繞一圈60分鐘），時針也在緩慢變化（轉動30度，30/60=0.5)
54                 hourPointer.Angle = (DateTime.Now.Hour * 30)+ (DateTime.Now.Minute * 0.5);
55                 //更新時間值
56                 this.labTime.Content = DateTime.Now.ToString("HH:mm:ss");
57             }));
58         }
59 
60     }
61 }

4、編譯運行，如果運氣不錯的話，應該能顯示如下效果：

5、總結

WPF可以用RotateTransform中的Angle進行旋轉，可以指定中心點（CenterX,CenterY)

 <Rectangle.RenderTransform>
       <RotateTransform x:Name="hourPointer" CenterX="0" CenterY="70" Angle="90" />
  </Rectangle.RenderTransform>

WPF鐘表效果實現