WPF 画线动画效果实现

弄了将近三天才搞定的，真是艰辛的实现。

看了很多博客，都太高深了，而且想要实现的功能都太强大了，结果基础部分一直实现不了，郁闷啊~

千辛万苦终于找到了一个Demo，打开一看，代码只有20几行，不行我非要记一笔。

说正题：

需求：一条直线（不是曲线），模范笔画一样在画布上逐渐画出来。但前提是，用后台代码实现，并非WPF标签

效果：

上代码：

 /// <summary>
    /// Window2.xaml 的交互逻辑
    /// </summary>
    public partial class Window2 : Window
    {
        public Window2()
        {
            InitializeComponent();
            var canvas = new Canvas();
            Content = canvas;
            var points =
                new List<Point>()
                {
                    new Point(10, 10),
                    new Point(90, 90),
                    new Point(60, 10),
                    new Point(250, 90),
                    new Point(10, 10)
                };
            var sb = new Storyboard();
            for (int i = 0; i < points.Count - 1; i++)
            {
                var lineGeometry = new LineGeometry(points[i], points[i]);
                var path =
                    new Path()
                    {
                        Stroke = Brushes.Black,
                        StrokeThickness = 2,
                        Data = lineGeometry
                    };
                canvas.Children.Add(path);
                var animation =
                    new PointAnimation(points[i], points[i + 1], new Duration(TimeSpan.FromMilliseconds(1000)))
                    {
                        BeginTime = TimeSpan.FromMilliseconds(i * 1010)
                    };
                sb.Children.Add(animation);
                RegisterName("geometry" + i, lineGeometry);
                Storyboard.SetTargetName(animation, "geometry" + i);
                Storyboard.SetTargetProperty(animation, new PropertyPath(LineGeometry.EndPointProperty));
            }
            MouseDown += (s, e) => sb.Begin(this);
        }
    }