<Window x:Class="WpfApplication3.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:WpfApplication3"
        mc:Ignorable="d"
        Title="AY绘图基础" Height="420" Width="600" Loaded="Window_Loaded" WindowStartupLocation="CenterScreen">
    <Grid>
        <Button x:Name="btnmove" Content="平移" Click="btnmove_Click" Width="80" Height="30" VerticalAlignment="Top" HorizontalAlignment="Left"/>
        <Canvas x:Name="canvas" Width="400" Height="300" Background="FloralWhite">
            
        </Canvas>
    </Grid>
</Window>

   Point p_start = new Point(150, 150);
        Point p_end = new Point(10, 30);
        Line l = new Line();
        private void Window_Loaded(object sender, RoutedEventArgs e)
        {
        
            l.Stroke = Brushes.Black;
            l.StrokeThickness = 2;
            l.X1 = p_start.X;
            l.X2 = p_end.X;
            l.Y1 = p_start.Y;
            l.Y2 = p_end.Y;
            canvas.Children.Add(l);
        }

  Storyboard sb = new Storyboard();
        private void btnmove_Click(object sender, RoutedEventArgs e)
        {
            p_end = new Point(10, 30);//重置
            p_end.Offset(125, 150);//=>(135,180)
            var daX = new DoubleAnimation(p_end.X, new Duration(TimeSpan.FromMilliseconds(1000)));
            var daY = new DoubleAnimation(p_end.Y, new Duration(TimeSpan.FromMilliseconds(1000)));
            sb.Children.Add(daX);
            sb.Children.Add(daY);
            Storyboard.SetTarget(daX, l);
            Storyboard.SetTarget(daY, l);
            Storyboard.SetTargetProperty(daX, new PropertyPath(Line.X2Property));
            Storyboard.SetTargetProperty(daY, new PropertyPath(Line.Y2Property));
            sb.Begin(this);
        }