模拟螺旋桨

本文关键字:螺旋桨 模拟 | 更新日期: 2023-09-27 18:37:10

我有这段代码在画布上显示一个矩形:

XAML :

<Window x:Class="rotateRect.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:rotateRect"
    mc:Ignorable="d"
    Title="MainWindow" Height="402.027" Width="600.676">
<Grid>
    <Canvas Name="my_c" HorizontalAlignment="Left" Height="24" Margin="160,149,0,0"  VerticalAlignment="Top" Width="177" RenderTransformOrigin="0.5,0.5">
        <Canvas.RenderTransform>
            <TransformGroup>
                <ScaleTransform/>
                <SkewTransform/>
                <RotateTransform Angle="-68.962"/>
                <TranslateTransform/>
            </TransformGroup>
        </Canvas.RenderTransform>
    </Canvas>
</Grid>

我可以使用"RenderTransform"在XAML中转换它。但我想在 c# 中实现这种旋转并创建一个"螺旋桨"。我试图为画布查找有关"旋转变换"的信息。Thys 是我的 c# 代码:

C# :

using System.Windows;
using System.Windows.Controls;
using System.Windows.Media;
using System.Windows.Shapes;
namespace rotateRect
{
    public partial class MainWindow : Window
    {
        Rectangle my_r = new Rectangle();
        public MainWindow()
        {
            InitializeComponent();
            initializeRect(my_r, my_c);
        }
        private void initializeRect(Rectangle r, Canvas c)
        {
            // rectangle 
            r.Width = 10;
            r.Height = 50;
            // rectangle Color
            r.Fill = new SolidColorBrush(Color.FromRgb(0, 0, 255));
            // canvas 
            c.Children.Add(r);
            c.Width = 10;
            c.Height = 50;
        }
    }
}

我找到了一个位图对象的"RotateTransform"示例,但我没有找到画布的任何内容。C#,旋转图形?

是否可以在 c# 中将 RotateTransform 应用于画布?

模拟螺旋桨

修改你的 initializeRect 方法e

private void initializeRect(Rectangle r, Canvas c)
        {
            // rectangle 
            r.Width = 10;
            r.Height = 50;
            // rectangle Color
            r.Fill = new SolidColorBrush(Color.FromRgb(0, 0, 255));
            // canvas 
            c.Children.Add(r);
            c.Width = 10;
            c.Height = 50;
            RotateTransform rt = new RotateTransform();
            rt.Angle=-68.962;
            c.RenderTransform = rt;
        }

"螺旋桨"是指动画?为此,您需要动画。只有旋转变换是不够的。

例如,让我们复制带有矩形但在 XAML 中的画布:

<Canvas Name="cnvs" VerticalAlignment="Center" HorizontalAlignment="Center"
        Loaded="cnvs_Loaded">
    <Canvas.Resources>
        <DoubleAnimation x:Key="rotator" From="0" To="360" Duration="0:0:1"
                         AutoReverse="False" RepeatBehavior="Forever" />
    </Canvas.Resources>
    <Canvas.RenderTransform>
        <RotateTransform x:Name="canvasRotation" />
    </Canvas.RenderTransform>
    <Rectangle Width="10" Height="50" Fill="Blue" />
</Canvas>

并在我们的 Loaded 事件处理程序中启动动画。Canvas 有自己的大小调整怪癖,因此我们需要为转换设置 CenterX 和 CenterY poperties:

private void cnvs_Loaded(object sender, RoutedEventArgs e)
{
     var canvas = (Canvas) sender;
     var animation = canvas.Resources["rotator"] as DoubleAnimation;
     var children = canvas.Children.OfType<FrameworkElement>().ToArray();
     canvasRotation.CenterX = children.Max(c => c.ActualWidth) / 2;
     canvasRotation.CenterY = children.Max(c => c.ActualHeight) / 2;
     canvasRotation.BeginAnimation(RotateTransform.AngleProperty, animation);
 }

<小时 />但是你真的需要这里的画布吗?我们可以用网格简化事情,例如:

<Grid Name="grid" VerticalAlignment="Top" HorizontalAlignment="Left"
        Loaded="grid_Loaded" RenderTransformOrigin="0.5,0.5">
    <Grid.Resources>
        <DoubleAnimation x:Key="rotator" From="0" To="360" Duration="0:0:1"
                         AutoReverse="False" RepeatBehavior="Forever" />
    </Grid.Resources>
    <Grid.RenderTransform>
        <RotateTransform x:Name="gridRotation" />
    </Grid.RenderTransform>
    <Rectangle Width="10" Height="50" Fill="Blue" />
</Grid>

private void grid_Loaded(object sender, RoutedEventArgs e)
{
     var g = (Grid) sender;
     var animation = g.Resources["rotator"] as DoubleAnimation;        
     gridRotation.BeginAnimation(RotateTransform.AngleProperty, animation);
}

或者,如果 Recntagle 是容器中唯一的对象,则仅对其进行动画处理。无需使事情复杂化。