C# 使用Y轴反转的ScaleTransform进行缩放

我的XAML：

<ScrollViewer Name="MyScrollViewer" CanContentScroll="True">
<Grid Grid.Column="1" Margin="10">
MouseWheel="Grid_OnMouseWheel">
<Grid.RenderTransform>
<ScaleTransform ScaleY="-1" />
</Grid.RenderTransform>
...
</Grid>
</ScrollViewer>

mouseweel=“Grid\u onmouseweel”>
...

我的代码：

如您所见，我需要左下角的零Y坐标：

private void Grid_OnMouseWheel(object sender, MouseWheelEventArgs e)
{

UIElement element = (UIElement)sender;
Point position = e.GetPosition(element);

double Width = element.RenderSize.Width;
double Height = element.RenderSize.Height;

Matrix GridMatrix = GUIGrid.LayoutTransform.Value;

if (e.Delta > 0)
{

ScaleFactor += 1;

ScaleTransform Transform = new ScaleTransform(ScaleFactor, ScaleFactor, position.X, position.Y);
Transform.ScaleY = -ScaleFactor;
GUIGrid.RenderTransform = Transform;
}
else
{

ScaleFactor -= 1;

if (ScaleFactor <= 0)
ScaleFactor = 1;

ScaleTransform Transform = new ScaleTransform(ScaleFactor, ScaleFactor, position.X, position.Y);
Transform.ScaleY = -ScaleFactor;
GUIGrid.RenderTransform = Transform;
}
e.Handled = true;
}

MouseWheel（对象发送者，MouseWheelEventArgs e）上的私有无效网格 { UIElement=（UIElement）发送方； 点位置=e.GetPosition（元素）； 双宽度=element.renderize.Width； 双重高度=element.renderize.Height； 矩阵GridMatrix=GUIGrid.LayoutTransform.Value； 如果（e.Delta>0） { ScaleFactor+=1； ScaleTransform转换=新的ScaleTransform（ScaleFactor，ScaleFactor，position.X，position.Y）； Transform.ScaleY=-ScaleFactor； GUIGrid.RenderTransform=转换； } 其他的 { ScaleFactor-=1；

---

如果（ScaleFactor好的，没有我希望的那么简单，而且文档很差

ScaleTransform Transform = new ScaleTransform();
Transform.Value.ScaleAtPrepend(ScaleFactor, ScaleFactor, Position.X, Position.Y);
Transform.ScaleX = ScaleFactor;
Transform.ScaleY = -ScaleFactor;
GUIGrid.RenderTransform = Transform;

现在工作和我预期的一样