产生动画线(generating animated line)

（X，Y）=（10,20），（50,30），（20,20），（40,22），（45,20），（50,35），........ 。

我想创建一个.Net.Normally我使用Windows窗体的动画。但是，如果需要的话，我可以使用WPF。

它始于（10,20）point.Actually线从（10,20）开始，然后去（50,30）与10ms的延迟点。然后，经过10毫秒等从（50,30）到（20,20）。

该值将从一个文本文件中读取。我可以简单地做两个ArrayList的X＆Y，把值从文本file.I只需要知道我怎么能生成这种X动画线，Y从每个节点到另一个10毫秒的延迟？

如果我的问题是很难理解的，请让我知道。我会尝试，使其更容易。

提前致谢。

Answer 1:

如果我理解正确的话，你要因为这将是刚刚绘制的动画就行了。下面是一个简单的例子，你的价值观。

<Window x:Class="WpfApplication1.MainWindow"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="MainWindow" Height="350" Width="525">

    <Canvas Name="lineCanvas" MouseLeftButtonDown="lineCanvas_MouseLeftButtonDown" Background="White" />
</Window>

事件处理程序将在稍后开始的动画。首先，我们定义数据：

List<Point> Points = new List<Point>();
Storyboard sb;

public MainWindow()
{
    InitializeComponent();

    Points.Add(new Point(10, 20));
    Points.Add(new Point(50, 30));
    Points.Add(new Point(20, 20));
    Points.Add(new Point(40, 22));
    Points.Add(new Point(45, 20));
    Points.Add(new Point(50, 35));

    InitAnimation();
}

sb是Storyboard将包含动画。 Points可以很容易地充满了从文件中的值。

让我们来初始化动画。一个新线路将被添加到每个段。则该行的终点将是动画。

public void InitAnimation()
{
    sb = new Storyboard();

    for (int i = 0; i < Points.Count - 1; ++i)
    {
        //new line for current line segment
        var l = new Line();
        l.Stroke = Brushes.Black;
        l.StrokeThickness = 2;

        //data from list
        var startPoint = Points[i];
        var endPoint = Points[i + 1];

        //set startpoint = endpoint will result in the line not being drawn
        l.X1 = startPoint.X;
        l.Y1 = startPoint.Y;
        l.X2 = startPoint.X;
        l.Y2 = startPoint.Y;
        lineCanvas.Children.Add(l);

        //Initialize the animations with duration of 1 second for each segment
        var daX = new DoubleAnimation(endPoint.X, new Duration(TimeSpan.FromMilliseconds(1000)));
        var daY = new DoubleAnimation(endPoint.Y, new Duration(TimeSpan.FromMilliseconds(1000)));
        //Define the begin time. This is sum of durations of earlier animations + 10 ms delay for each
        daX.BeginTime = TimeSpan.FromMilliseconds(i * 1010);
        daY.BeginTime = TimeSpan.FromMilliseconds(i * 1010);

        sb.Children.Add(daX);
        sb.Children.Add(daY);

        //Set the targets for the animations
        Storyboard.SetTarget(daX, l);
        Storyboard.SetTarget(daY, l);
        Storyboard.SetTargetProperty(daX, new PropertyPath(Line.X2Property));
        Storyboard.SetTargetProperty(daY, new PropertyPath(Line.Y2Property));
    }
}

动画的持续时间可以很容易地根据该线的长度，使它看起来更好而改变。

最后的任务，显示动画：

private void lineCanvas_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)
{
    sb.Begin(this);
}

Answer 2:

下面是关于尼科的伟大回答的变化。我用PointAnimation动画的EndPoint上LineGeometry其作为Data的Path 。

using System;
using System.Collections.Generic;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Shapes;

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

            var canvas = new Canvas();

            Content = canvas;

            var points =
                new List<Point>()
                {
                    new Point(10, 10),
                    new Point(90, 10),
                    new Point(90, 90),
                    new Point(10, 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);
        }
    }
}

文章来源: generating animated line