1
以下代码绘制一条线,将其旋转30度左右,将其恢复到其原始位置,将其绕右端旋转30度,然后重复多次。围绕不同中心进行连续旋转?
我该如何对这些旋转进行排序而不将这条线恢复到原来的位置?第一次旋转(左端点附近)导致右端点移动;所以我希望下一轮轮换在新的位置。
序列的净效应应该是使线段“前进”。
(请注意,此代码使用相同的角度一遍又一遍,但我需要一个解决方案,如果角度每次都是不同的,也将正常工作。)
XAML: -
<UserControl x:Class="Rotation.MainPage"
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"
mc:Ignorable="d" d:DesignWidth="640" d:DesignHeight="480">
<Grid x:Name="LayoutRoot">
<Canvas Width="500" Height="500">
<Line Name="TheLine" X1="100" Y1="200" X2="200" Y2="200" Stroke="Black" StrokeThickness="5"></Line>
</Canvas>
</Grid>
</UserControl>
代码: -
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 Rotation
{
public partial class MainPage : UserControl
{
double x1, y1, x2, y2;
public MainPage()
{
InitializeComponent();
for (int i = 0; i < 5; i++)
{
_animations.Add(() => { return rot(true, -30); });
_animations.Add(() => { return rot(false, 30); });
}
_enumerator = _animations.GetEnumerator();
x1 = TheLine.X1;
x2 = TheLine.X2;
y1 = TheLine.Y1;
y2 = TheLine.Y2;
this.Loaded += delegate(object sender, RoutedEventArgs e)
{
RunNextAnimation();
};
}
List<Func<Storyboard>> _animations = new List<Func<Storyboard>>();
IEnumerator<Func<Storyboard>> _enumerator;
public void AnimationCompleted(object sender, EventArgs args)
{
RunNextAnimation();
}
void RunNextAnimation()
{
if (_enumerator.MoveNext())
{
Func<Storyboard> fn = _enumerator.Current;
if (fn != null)
{
Storyboard board = fn();
board.Completed += AnimationCompleted;
board.Begin();
}
}
}
public Storyboard rot(bool aroundLeft, double angle)
{
Storyboard board = new Storyboard();
int duration = 5;
if (true)
{
RotateTransform rot = new RotateTransform();
if (aroundLeft)
{
rot.CenterX = x1;
rot.CenterY = y1;
}
else
{
rot.CenterX = x2;
rot.CenterY = y2;
}
TheLine.RenderTransform = rot;
DoubleAnimation an = new DoubleAnimation();
an.Duration = new Duration(new TimeSpan(0, 0, duration));
an.From = 0;
an.To = angle;
board.Children.Add(an);
Storyboard.SetTarget(an, TheLine);
Storyboard.SetTargetProperty(an, new PropertyPath("(UIElement.RenderTransform).Angle"));
}
return board;
}
}
}