Question

我想通过移动终点（X2，Y2）并同时将起点（X1，Y1）固定为（0,0）来旋转线L。下面的代码使线沿线L的中点旋转。你能帮我怎么做吗？

//XAML
<Window x:Class="SPDisplay.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:SPDisplay"
        mc:Ignorable="d"
        Title="PPI Display" Height="1000" Width="1000">
    <StackPanel Orientation="Vertical" HorizontalAlignment="Center" VerticalAlignment="Center" Name="sp">

        <Line Stroke="Black" StrokeThickness="2" Margin="0" Name="lineSweep"
                X1="0" Y1="0" X2="0" Y2="0"/>       
    </StackPanel>
</Window>

//C# code

using System;
using System.Windows;
using System.Windows.Shapes;
using System.Windows.Media.Animation;

Storyboard sb = new Storyboard();

DoubleAnimation animateY1 = new DoubleAnimation();
animateY1.From = 0;
animateY1.To = 0;
animateY1.Duration = TimeSpan.Parse("0:0:5");

DoubleAnimation animateX1 = new DoubleAnimation();
animateX1.From = 0;
animateX1.To = 0;
animateX1.Duration = TimeSpan.Parse("0:0:5");

DoubleAnimation animateY2 = new DoubleAnimation();
animateY2.From = 200;
animateY2.To = 0;
animateY2.Duration = TimeSpan.Parse("0:0:5");

DoubleAnimation animateX2 = new DoubleAnimation();
animateX2.From = 0;
animateX2.To = 200;
animateX2.Duration = TimeSpan.Parse("0:0:5");

sb.Children.Add(animateY1);
sb.Children.Add(animateX1);

sb.Children.Add(animateY2);
sb.Children.Add(animateX2);

Storyboard.SetTargetName(animateY1, "lineSweep");
Storyboard.SetTargetProperty(animateY1, new PropertyPath(Line.Y1Property));

Storyboard.SetTargetName(animateX1, "lineSweep");
Storyboard.SetTargetProperty(animateX1, new PropertyPath(Line.X1Property));


Storyboard.SetTargetName(animateY2, "lineSweep");
Storyboard.SetTargetProperty(animateY2,new PropertyPath(Line.Y2Property));

Storyboard.SetTargetName(animateX2, "lineSweep");
Storyboard.SetTargetProperty(animateX2, new PropertyPath(Line.X2Property));

sb.Begin(lineSweep);

Answer 1

动画实际上正在执行您想要的操作。问题是您选择的容器。如果将Background="Red"设置为StackPanel，您会看到发生了什么。尝试使用Canvas而不是StackPanel。

如何在WPF中固定端点的直线旋转

1 个答案: