WPF在样式定义和UI动画上面相对于以前的技术有了不少的提升，下面给出WPF技术实现钟表的效果：
1、Visual Studio新建一个WPF应用程序，命名为WpfClock，新建一个images文件夹，并准备一个钟表的背景图片和程序图标素材。
2、编辑MainWindow.xaml文件，对UI进行定制，代码如下(指针都是用Rectangle实现的，当然可以用图片代替)：
<Window x:Class="WpfClock.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="MainWindow" Margin="2" Height="327" Width="311" AllowsTransparency="True"
WindowStyle="None" Background="Transparent" WindowStartupLocation="CenterScreen"
Icon="images/clock.ico"
ResizeMode="NoResize" Topmost="False" Opacity="1">
<Grid Width="300" Height="300" MouseLeftButtonDown="Grid_MouseLeftButtonDown">
<Image Source="images/backGround.png"></Image> <Label Name="lab商标" Foreground="White" Margin="0,0,0,211" HorizontalAlignment="Center" VerticalAlignment="Bottom" Height="Auto" Width="Auto" FontSize="13" >JackMoon</Label>
<Label Name="lab创建时间" Foreground="White" Margin="0,91,0,0" HorizontalAlignment="Center" VerticalAlignment="Top" Height="Auto" Width="Auto">1987</Label> <!-- 秒针定义 -->
<Rectangle Margin="150,0,149,150" Name="rectangleSecond" Stroke="White" Height="120" VerticalAlignment="Bottom" Width="1">
<Rectangle.RenderTransform>
<RotateTransform x:Name="secondPointer" CenterX="0" CenterY="120" Angle="0" />
</Rectangle.RenderTransform>
</Rectangle>
<!-- --> <!-- 分钟定义 -->
<Rectangle Margin="150,49,149,151" Name="rectangleMinute" Stroke="LightGreen" Width="1">
<Rectangle.RenderTransform>
<RotateTransform x:Name="minutePointer" CenterX="0" CenterY="100" Angle="45" />
</Rectangle.RenderTransform>
</Rectangle>
<!-- --> <!-- 时针定义 -->
<Rectangle Margin="150,80,149,150" Name="rectangleHour" Stroke="LightYellow" Width="1">
<Rectangle.RenderTransform>
<RotateTransform x:Name="hourPointer" CenterX="0" CenterY="70" Angle="90" />
</Rectangle.RenderTransform>
</Rectangle>
<!---->
<Label Content="08:08:08" FontSize="16" Foreground="White" Height="Auto" HorizontalAlignment="Center" Margin="114,0,113,86" Name="labTime" VerticalAlignment="Bottom" Width="Auto" /> </Grid>
</Window>
3、编辑MainWindow.xaml.CS文件，对后台逻辑进行定制，代码如下：
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 WpfClock
{
using System.Threading;
using System.Windows.Threading;
/// <summary>
/// MainWindow.xaml 的交互逻辑
/// </summary>
public partial class MainWindow : Window
{
//计时器
System.Timers.Timer timer = new System.Timers.Timer();
public MainWindow()
{
InitializeComponent();
#region 初始化时间
secondPointer.Angle = DateTime.Now.Second * ;
minutePointer.Angle = DateTime.Now.Minute * ;
hourPointer.Angle = (DateTime.Now.Hour * ) + (DateTime.Now.Minute * 0.5);
this.labTime.Content = DateTime.Now.ToString("HH:mm:ss");
#endregion
timer.Elapsed += new System.Timers.ElapsedEventHandler(timer_Elapsed);
timer.Enabled = true;
} private void Grid_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)
{
//进行拖放移动
this.DragMove();
}
private void timer_Elapsed(object sender, System.Timers.ElapsedEventArgs e)
{
//UI异步更新
this.Dispatcher.Invoke(DispatcherPriority.Normal, (Action)(() =>
{
//秒针转动,秒针绕一圈360度，共60秒，所以1秒转动6度
secondPointer.Angle = DateTime.Now.Second * ;
//分针转动,分针绕一圈360度，共60分，所以1分转动6度
minutePointer.Angle = DateTime.Now.Minute * ;
//时针转动,时针绕一圈360度，共12时，所以1时转动30度。
//另外同一个小时内，随着分钟数的变化(绕一圈60分钟），时针也在缓慢变化（转动30度，30/60=0.5)
hourPointer.Angle = (DateTime.Now.Hour * )+ (DateTime.Now.Minute * 0.5);
//更新时间值
this.labTime.Content = DateTime.Now.ToString("HH:mm:ss");
}));
} }
}
4、编译运行，如果运气不错的话，应该能显示如下效果：
5、总结
WPF可以用RotateTransform中的Angle进行旋转，可以指定中心点（CenterX,CenterY)
<Rectangle.RenderTransform>
<RotateTransform x:Name="hourPointer" CenterX="0" CenterY="70" Angle="90" />
</Rectangle.RenderTransform>