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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)：

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<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：

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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(1000);
        public MainWindow()
        {
            InitializeComponent();
            #region 初始化时间
            secondPointer.Angle = DateTime.Now.Second * 6;
            minutePointer.Angle = DateTime.Now.Minute * 6;
            hourPointer.Angle = (DateTime.Now.Hour * 30) + (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 * 6;
                //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 * 6;
                //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 * 30)+ (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)

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

 

 

from:https://www.cnblogs.com/isaboy/p/wpfclock.html

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