I have this code that display a rectangle on a canvas :
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>
I can turn it in XAML with "RenderTransform". But i wanted to implement this rotation in c# and create a "propeller". I tried to find information about "RotateTransform" for a canvas. Thys is my c# code :
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;
}
}
}
I found an exemple of "RotateTransform" for a bitmap object but i hadn't find anything for a canvas. C#, rotating Graphics?
It's possible to apply a RotateTransform to a canvas in c#?
答案 0 :(得分:0)
修改initializeRect方法
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;
}
答案 1 :(得分:0)
'螺旋桨'你的意思是动画吗?为此,你需要动画。只有RotateTransform是不够的。
例如,让我们使用Rectangle复制你的Canvas但是在XAML中:
<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>
在我们的Loaded事件处理程序中启动动画。 Canvas有它自己的尺寸怪癖,所以我们需要为变换设置CenterX和CenterY的特性:
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/> 但你真的需要一个Canvas吗?我们可以使用Grid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>
和
private void grid_Loaded(object sender, RoutedEventArgs e)
{
var g = (Grid) sender;
var animation = g.Resources["rotator"] as DoubleAnimation;
gridRotation.BeginAnimation(RotateTransform.AngleProperty, animation);
}
或者只为Recntagle设置动画,如果它是容器中唯一的对象。无需复杂化。