public static readonly DependencyProperty AngleProperty; public static readonly DependencyProperty CenterXProperty; public static readonly DependencyProperty CenterYProperty; public RotateTransform(); public RotateTransform(double angle); public RotateTransform(double angle, double centerX, double centerY); public double Angle { get; set; } public double CenterX { get; set; } public double CenterY { get; set; } public override Matrix Value { get; } public RotateTransform Clone(); public RotateTransform CloneCurrentValue(); protected override Freezable CreateInstanceCore();

Angle属性表示获取或设置顺时针旋转的角度（以度为单位）。默认值是0度。CenterX 和CenterY 表示获取或设置旋转中心点的 x y坐标，Value属性表示当前转换的矩阵。通常我们只需要设置Angle、CenterX 和CenterY即可。

一、RotateTransform示例

<Window x:Class="HelloWorld.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:HelloWorld" 
        xmlns:controls="clr-namespace:HelloWorld.Controls"
        xmlns:helper="clr-namespace:HelloWorld.MVVM"
        mc:Ignorable="d" Background="Lavender"   
        MouseMove="Window_MouseMove"
        Title="WPF中文网 - www.wpfsoft.com" Height="350" Width="500">
    <Window.DataContext>
        <local:MainViewModel/>
    </Window.DataContext>
        <Grid.ColumnDefinitions>
            <ColumnDefinition/>
            <ColumnDefinition/>
            <ColumnDefinition/>
        </Grid.ColumnDefinitions>
        <Button Grid.Column="0" 
                Width="100" 
                Height="25" 
                Content="RotateTransform" 
                HorizontalAlignment="Center" 
                VerticalAlignment="Center">
            <Button.RenderTransform>
                <RotateTransform Angle="{Binding ElementName=slider,Path=Value}"/>
            </Button.RenderTransform>
        </Button>
        <Button Grid.Column="1" 
                Width="100" 
                Height="25" 
                Content="RotateTransform" 
                HorizontalAlignment="Center" 
                VerticalAlignment="Center">
            <Button.RenderTransform>
                <RotateTransform Angle="{Binding ElementName=slider,Path=Value}" 
                                 CenterX="50" CenterY="12.5"/>
            </Button.RenderTransform>
        </Button>
        <Button x:Name="button" 
                Grid.Column="2" 
                Width="100" 
                Height="25" 
                Content="RotateTransform" 
                HorizontalAlignment="Center" 
                VerticalAlignment="Center">
            <Button.RenderTransform>
                <RotateTransform Angle="45"/>
            </Button.RenderTransform>
        </Button>
        <Slider x:Name="slider" 
                Grid.ColumnSpan="3" 
                Margin="30" 
                HorizontalAlignment="Left" 
                VerticalAlignment="Bottom" 
                Value="0" 
                Maximum="720" 
                Width="400" />
    </Grid>
</Window>
private void Window_MouseMove(object sender, MouseEventArgs e)
    if (button.RenderTransform is RotateTransform rotateTransform)
        Point point = e.GetPosition(this);
        rotateTransform.Angle = point.X + point.Y;