C# WPF 时钟动画(2/2)

模拟实现时钟效果，学习WPF动画好例子，本文承接上文 C# WPF 时钟动画(1/2)。

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C# WPF 时钟动画(2/2)

内容目录

1. 实现效果
2. 业务场景
3. 编码实现
4. 本文参考
5. 源码下载

1.实现效果

时钟实时展示系统本机时间

2.业务场景

模拟时钟

3.编码实现

使用 .Net Core 3.1 创建名为 “Clock” 的WPF解决方案，解决方案中需要添加时钟背景图片，图片如下：https://github.com/Abel13/Clock/blob/master/Clock/Assets/clock.png

3.1 主窗体 MainWindow.xaml

使用3个Border布局时钟的时针、分针、秒针，并给3个指针添加动画，动画说明如下：

1. 时针每12个小时循环一圈(360°)，每个小时旋转30°（30°*12=360°）；
2. 分针每60分钟循环一圈(360°)，每分钟旋转6°（6°*60=360°）；
3. 秒针每60秒循环一圈（360°），每秒钟旋转6°（6°*60=360°），并且秒针旋转6°有个轻微的摆动动画。

<Window x:Class="Clock.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:local="clr-namespace:Clock"
        mc:Ignorable="d"
        AllowsTransparency="True" WindowStyle="None" ResizeMode="NoResize"
        Height="520" Width="520" WindowStartupLocation="CenterScreen" Background="{x:Null}">
    <Window.Resources>
        <Storyboard x:Key="sbseconds" RepeatBehavior="Forever">
            <DoubleAnimationUsingKeyFrames Storyboard.TargetName="second" Storyboard.TargetProperty="(UIElement.RenderTransform).(TransformGroup.Children)[2].(RotateTransform.Angle)">
                <EasingDoubleKeyFrame KeyTime="0" Value="-90">
                    <EasingDoubleKeyFrame.EasingFunction>
                        <BackEase EasingMode="EaseOut" Amplitude="0.4"/>
                    </EasingDoubleKeyFrame.EasingFunction>
                </EasingDoubleKeyFrame>
                <EasingDoubleKeyFrame KeyTime="00:00:1" Value="-84">
                    <EasingDoubleKeyFrame.EasingFunction>
                        <BackEase EasingMode="EaseOut" Amplitude="0.4"/>
                    </EasingDoubleKeyFrame.EasingFunction>
                </EasingDoubleKeyFrame>
                <EasingDoubleKeyFrame KeyTime="00:00:2" Value="-78">
                    <EasingDoubleKeyFrame.EasingFunction>
                        <BackEase EasingMode="EaseOut" Amplitude="0.4"/>
                    </EasingDoubleKeyFrame.EasingFunction>
                </EasingDoubleKeyFrame>
                <EasingDoubleKeyFrame KeyTime="00:00:3" Value="-72">
                    <EasingDoubleKeyFrame.EasingFunction>
                        <BackEase EasingMode="EaseOut" Amplitude="0.4"/>
                    </EasingDoubleKeyFrame.EasingFunction>
                </EasingDoubleKeyFrame>
                <EasingDoubleKeyFrame KeyTime="00:00:4" Value="-66">
                    <EasingDoubleKeyFrame.EasingFunction>
                        <BackEase EasingMode="EaseOut" Amplitude="0.4"/>
                    </EasingDoubleKeyFrame.EasingFunction>
                </EasingDoubleKeyFrame>
                <EasingDoubleKeyFrame KeyTime="00:00:5" Value="-60">
                    <EasingDoubleKeyFrame.EasingFunction>
                        <BackEase EasingMode="EaseOut" Amplitude="0.4"/>
                    </EasingDoubleKeyFrame.EasingFunction>
                </EasingDoubleKeyFrame>
                <EasingDoubleKeyFrame KeyTime="00:00:6" Value="-54">
                    <EasingDoubleKeyFrame.EasingFunction>
                        <BackEase EasingMode="EaseOut" Amplitude="0.4"/>
                    </EasingDoubleKeyFrame.EasingFunction>
                </EasingDoubleKeyFrame>
                <EasingDoubleKeyFrame KeyTime="00:00:7" Value="-48">
                    <EasingDoubleKeyFrame.EasingFunction>
                        <BackEase EasingMode="EaseOut" Amplitude="0.4"/>
                    </EasingDoubleKeyFrame.EasingFunction>
                </EasingDoubleKeyFrame>
                <EasingDoubleKeyFrame KeyTime="00:00:8" Value="-42">
                    <EasingDoubleKeyFrame.EasingFunction>
                        <BackEase EasingMode="EaseOut" Amplitude="0.4"/>
                    </EasingDoubleKeyFrame.EasingFunction>
                </EasingDoubleKeyFrame>
                <EasingDoubleKeyFrame KeyTime="00:00:9" Value="-36">
                    <EasingDoubleKeyFrame.EasingFunction>
                        <BackEase EasingMode="EaseOut" Amplitude="0.4"/>
                    </EasingDoubleKeyFrame.EasingFunction>
                </EasingDoubleKeyFrame>
                <EasingDoubleKeyFrame KeyTime="00:00:10" Value="-30">
                    <EasingDoubleKeyFrame.EasingFunction>
                        <BackEase EasingMode="EaseOut" Amplitude="0.4"/>
                    </EasingDoubleKeyFrame.EasingFunction>
                </EasingDoubleKeyFrame>
                <EasingDoubleKeyFrame KeyTime="00:00:11" Value="-24">
                    <EasingDoubleKeyFrame.EasingFunction>
                        <BackEase EasingMode="EaseOut" Amplitude="0.4"/>
                    </EasingDoubleKeyFrame.EasingFunction>
                </EasingDoubleKeyFrame>
                <EasingDoubleKeyFrame KeyTime="00:00:12" Value="-18">
                    <EasingDoubleKeyFrame.EasingFunction>
                        <BackEase EasingMode="EaseOut" Amplitude="0.4"/>
                    </EasingDoubleKeyFrame.EasingFunction>
                </EasingDoubleKeyFrame>
                <EasingDoubleKeyFrame KeyTime="00:00:13" Value="-12">
                    <EasingDoubleKeyFrame.EasingFunction>
                        <BackEase EasingMode="EaseOut" Amplitude="0.4"/>
                    </EasingDoubleKeyFrame.EasingFunction>
                </EasingDoubleKeyFrame>
                <EasingDoubleKeyFrame KeyTime="00:00:14" Value="-6">
                    <EasingDoubleKeyFrame.EasingFunction>
                        <BackEase EasingMode="EaseOut" Amplitude="0.4"/>
                    </EasingDoubleKeyFrame.EasingFunction>
                </EasingDoubleKeyFrame>
                <EasingDoubleKeyFrame KeyTime="00:00:15" Value="0">
                    <EasingDoubleKeyFrame.EasingFunction>
                        <BackEase EasingMode="EaseOut" Amplitude="0.4"/>
                    </EasingDoubleKeyFrame.EasingFunction>
                </EasingDoubleKeyFrame>
                <EasingDoubleKeyFrame KeyTime="00:00:16" Value="6">
                    <EasingDoubleKeyFrame.EasingFunction>
                        <BackEase EasingMode="EaseOut" Amplitude="0.4"/>
                    </EasingDoubleKeyFrame.EasingFunction>
                </EasingDoubleKeyFrame>
                <EasingDoubleKeyFrame KeyTime="00:00:17" Value="12">
                    <EasingDoubleKeyFrame.EasingFunction>
                        <BackEase EasingMode="EaseOut" Amplitude="0.4"/>
                    </EasingDoubleKeyFrame.EasingFunction>
                </EasingDoubleKeyFrame>
                <EasingDoubleKeyFrame KeyTime="00:00:18" Value="18">
                    <EasingDoubleKeyFrame.EasingFunction>
                        <BackEase EasingMode="EaseOut" Amplitude="0.4"/>
                    </EasingDoubleKeyFrame.EasingFunction>
                </EasingDoubleKeyFrame>
                <EasingDoubleKeyFrame KeyTime="00:00:19" Value="24">
                    <EasingDoubleKeyFrame.EasingFunction>
                        <BackEase EasingMode="EaseOut" Amplitude="0.4"/>
                    </EasingDoubleKeyFrame.EasingFunction>
                </EasingDoubleKeyFrame>
                <EasingDoubleKeyFrame KeyTime="00:00:20" Value="30">
                    <EasingDoubleKeyFrame.EasingFunction>
                        <BackEase EasingMode="EaseOut" Amplitude="0.4"/>
                    </EasingDoubleKeyFrame.EasingFunction>
                </EasingDoubleKeyFrame>
                <EasingDoubleKeyFrame KeyTime="00:00:21" Value="36">
                    <EasingDoubleKeyFrame.EasingFunction>
                        <BackEase EasingMode="EaseOut" Amplitude="0.4"/>
                    </EasingDoubleKeyFrame.EasingFunction>
                </EasingDoubleKeyFrame>
                <EasingDoubleKeyFrame KeyTime="00:00:22" Value="42">
                    <EasingDoubleKeyFrame.EasingFunction>
                        <BackEase EasingMode="EaseOut" Amplitude="0.4"/>
                    </EasingDoubleKeyFrame.EasingFunction>
                </EasingDoubleKeyFrame>
                <EasingDoubleKeyFrame KeyTime="00:00:23" Value="48">
                    <EasingDoubleKeyFrame.EasingFunction>
                        <BackEase EasingMode="EaseOut" Amplitude="0.4"/>
                    </EasingDoubleKeyFrame.EasingFunction>
                </EasingDoubleKeyFrame>
                <EasingDoubleKeyFrame KeyTime="00:00:24" Value="54">
                    <EasingDoubleKeyFrame.EasingFunction>
                        <BackEase EasingMode="EaseOut" Amplitude="0.4"/>
                    </EasingDoubleKeyFrame.EasingFunction>
                </EasingDoubleKeyFrame>
                <EasingDoubleKeyFrame KeyTime="00:00:25" Value="60">
                    <EasingDoubleKeyFrame.EasingFunction>
                        <BackEase EasingMode="EaseOut" Amplitude="0.4"/>
                    </EasingDoubleKeyFrame.EasingFunction>
                </EasingDoubleKeyFrame>
                <EasingDoubleKeyFrame KeyTime="00:00:26" Value="66">
                    <EasingDoubleKeyFrame.EasingFunction>
                        <BackEase EasingMode="EaseOut" Amplitude="0.4"/>
                    </EasingDoubleKeyFrame.EasingFunction>
                </EasingDoubleKeyFrame>
                <EasingDoubleKeyFrame KeyTime="00:00:27" Value="72">
                    <EasingDoubleKeyFrame.EasingFunction>
                        <BackEase EasingMode="EaseOut" Amplitude="0.4"/>
                    </EasingDoubleKeyFrame.EasingFunction>
                </EasingDoubleKeyFrame>
                <EasingDoubleKeyFrame KeyTime="00:00:28" Value="78">
                    <EasingDoubleKeyFrame.EasingFunction>
                        <BackEase EasingMode="EaseOut" Amplitude="0.4"/>
                    </EasingDoubleKeyFrame.EasingFunction>
                </EasingDoubleKeyFrame>
                <EasingDoubleKeyFrame KeyTime="00:00:29" Value="84">
                    <EasingDoubleKeyFrame.EasingFunction>
                        <BackEase EasingMode="EaseOut" Amplitude="0.4"/>
                    </EasingDoubleKeyFrame.EasingFunction>
                </EasingDoubleKeyFrame>
                <EasingDoubleKeyFrame KeyTime="00:00:30" Value="90">
                    <EasingDoubleKeyFrame.EasingFunction>
                        <BackEase EasingMode="EaseOut" Amplitude="0.4"/>
                    </EasingDoubleKeyFrame.EasingFunction>
                </EasingDoubleKeyFrame>
            </DoubleAnimationUsingKeyFrames>
        </Storyboard>
    </Window.Resources>
    <Window.Triggers>
        <EventTrigger RoutedEvent="FrameworkElement.Loaded">
            <BeginStoryboard Storyboard="{StaticResource sbseconds}"/>
        </EventTrigger>
    </Window.Triggers>
    <Grid>
        <Border BorderThickness="10" BorderBrush="Black" CornerRadius="300" Width="520" Height="520">
            <Grid Height="500" Width="500" HorizontalAlignment="Center" VerticalAlignment="Center">
                <Border CornerRadius="350">
                    <Border.Background>
                        <ImageBrush ImageSource="Assets/clock.png"/>
                    </Border.Background>
                </Border>

                <Border CornerRadius="350" Background="#778889BB"/>

                <Border x:Name="hour" CornerRadius="0 15 15 0" Height="10" Width="130" BorderThickness="3" BorderBrush="#FF66B01C" Margin="0,245,120,245" HorizontalAlignment="Right" RenderTransformOrigin="0,0.5">
                    <Border.RenderTransform>
                        <TransformGroup>
                            <ScaleTransform/>
                            <SkewTransform/>
                            <RotateTransform Angle="-90"/>
                            <TranslateTransform/>
                        </TransformGroup>
                    </Border.RenderTransform>
                </Border>
                <Border x:Name="minute" CornerRadius="0 15 15 0" Height="5" Width="160" BorderThickness="3" BorderBrush="#FFD15209" Margin="250.5,247,0,248" HorizontalAlignment="Left" RenderTransformOrigin="0,0.5">
                    <Border.RenderTransform>
                        <TransformGroup>
                            <ScaleTransform/>
                            <SkewTransform/>
                            <RotateTransform Angle="-90"/>
                            <TranslateTransform/>
                        </TransformGroup>
                    </Border.RenderTransform>
                </Border>
                <Border x:Name="second" CornerRadius="0 15 15 0" Height="3" Width="220" Background="Red" Margin="0,248,30,248" HorizontalAlignment="Right" RenderTransformOrigin="0,0.5">
                    <Border.RenderTransform>
                        <TransformGroup>
                            <ScaleTransform/>
                            <SkewTransform/>
                            <RotateTransform Angle="-90"/>
                            <TranslateTransform/>
                        </TransformGroup>
                    </Border.RenderTransform>
                </Border>
                <Ellipse Fill="Black" Width="20" Height="20" HorizontalAlignment="Center" VerticalAlignment="Center"/>
            </Grid>
        </Border>
    </Grid>
</Window>

3.2 MainWindow.xaml.cs

后台代码开启三个指针动画，并设置各指针动画起始位置

using System;
using System.Windows;
using System.Windows.Input;
using System.Windows.Media.Animation;

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

            int now_hours = DateTime.Now.Hour > 12 ? (DateTime.Now.Hour - 12) : DateTime.Now.Hour;
            int now_minutes = DateTime.Now.Minute;
            int now_seconds = DateTime.Now.Second;

            Storyboard seconds = (Storyboard)second.FindResource("sbseconds");
            seconds.Begin();
            seconds.Seek(new TimeSpan(0, 0, 0, now_seconds, 0));

            Storyboard minutes = (Storyboard)minute.FindResource("sbminutes");
            minutes.Begin();
            minutes.Seek(new TimeSpan(0, 0, now_minutes, now_seconds, 0));

            Storyboard hours = (Storyboard)hour.FindResource("sbhours");
            hours.Begin();
            hours.Seek(new TimeSpan(0, now_hours, now_minutes, now_seconds, 0));
        }

        private void Window_MouseDown(object sender, MouseButtonEventArgs e)
        {
            DragMove();
        }
    }
}

4.本文参考

Design com WPF 大神的学习视频：

1/2 - Creating a clock with Animations

2/2 - Creating a clock with Animations

5.代码下载

源码中实现了全部效果，大伙可以直接下载编译运行；建议看大神视频手敲一遍，加深学习印象；视频中使用Blend布局时钟、设置动画，类似PS(PhotoShop)，设计界面很是方便的。

Github源码下载：Clock

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