如何在WPF的触摸屏上转换和裁剪图像？

// XAML代码
<Grid>
    <Image x:Name="image" Source="image.jpg" TouchDown="image_TouchDown" TouchMove="image_TouchMove" TouchUp="image_TouchUp">
        <Image.RenderTransform>
            <TransformGroup>
                <ScaleTransform x:Name="scaleTransform" />
                <RotateTransform x:Name="rotateTransform" />
                <TranslateTransform x:Name="translateTransform" />
            </TransformGroup>
        </Image.RenderTransform>
        <Image.Clip>
            <RectangleGeometry x:Name="clipGeometry" />
        </Image.Clip>
    </Image>
</Grid>

// C#代码
private Point startPoint;
private bool isDragging = false;

private void image_TouchDown(object sender, TouchEventArgs e)
{
    startPoint = e.GetTouchPoint(image).Position;
    isDragging = true;
}

private void image_TouchMove(object sender, TouchEventArgs e)
{
    if (isDragging)
    {
        Point currentPoint = e.GetTouchPoint(image).Position;
        Vector offset = currentPoint - startPoint;

        // 图像平移
        translateTransform.X = offset.X;
        translateTransform.Y = offset.Y;
    }
}

private void image_TouchUp(object sender, TouchEventArgs e)
{
    isDragging = false;
}

// 图像缩放
private void ZoomIn()
{
    scaleTransform.ScaleX *= 1.1;
    scaleTransform.ScaleY *= 1.1;
}

private void ZoomOut()
{
    scaleTransform.ScaleX /= 1.1;
    scaleTransform.ScaleY /= 1.1;
}

// 图像旋转
private void RotateClockwise()
{
    rotateTransform.Angle += 90;
}

private void RotateCounterClockwise()
{
    rotateTransform.Angle -= 90;
}

// 图像裁剪
private void ClipImage(Rect rect)
{
    clipGeometry.Rect = rect;
}