WPF C#动画制作线性渐变笔刷起点或终点

using System;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Media;
using System.Windows.Media.Animation;

namespace WpfApp
{
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
        }

        private void StartAnimationButton_Click(object sender, RoutedEventArgs e)
        {
            // 创建一个线性渐变笔刷
            LinearGradientBrush brush = new LinearGradientBrush();
            brush.StartPoint = new Point(0, 0); // 设置起点
            brush.EndPoint = new Point(1, 1); // 设置终点
            brush.GradientStops.Add(new GradientStop(Colors.Red, 0)); // 添加渐变色
            brush.GradientStops.Add(new GradientStop(Colors.Blue, 1));

            // 创建一个动画，控制起点或终点的X坐标
            DoubleAnimation animation = new DoubleAnimation();
            animation.From = 0; // 起始值
            animation.To = 1; // 终止值
            animation.Duration = TimeSpan.FromSeconds(2); // 动画持续时间
            animation.AutoReverse = true; // 动画结束后是否自动反向播放
            animation.RepeatBehavior = RepeatBehavior.Forever; // 动画重复次数

            // 将动画应用到线性渐变笔刷的起点或终点属性上
            Storyboard.SetTarget(animation, brush);
            Storyboard.SetTargetProperty(animation, new PropertyPath(LinearGradientBrush.StartPointProperty)); // 或者使用EndPointProperty

            // 创建一个Storyboard，并将动画添加到Storyboard中
            Storyboard storyboard = new Storyboard();
            storyboard.Children.Add(animation);

            // 启动动画
            storyboard.Begin();
        }
    }
}