WPF钟表效果实现

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>