Question

How do I set the absolute position of a GeometryDrawing?
Currently the line is always drawn in the center.
I guess the LineGeometery is always following the Alignments on Image control.

Here is some (now edited) code I am working with:

<Window x:Class="WpfProblem.MainWindow"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="MainWindow"   >
<Grid Width="450" Height="160" Background="Beige" VerticalAlignment="Stretch">
    <Border BorderBrush="Lime" BorderThickness="1" CornerRadius="80" Background="#1AFF0000" Margin="0">
        <Image Width="420" Height="120" Stretch="None" >
            <Image.Source>
                <DrawingImage>
                    <DrawingImage.Drawing>
                        <GeometryDrawing>
                            <GeometryDrawing.Geometry>
                                <LineGeometry StartPoint="0,30" EndPoint="299,30"/>
                            </GeometryDrawing.Geometry>
                            <GeometryDrawing.Pen>
                                <Pen Thickness="5" Brush="Black"/>
                            </GeometryDrawing.Pen>
                        </GeometryDrawing>
                    </DrawingImage.Drawing>
                </DrawingImage>
            </Image.Source>
        </Image>
    </Border>
</Grid>
</Window>

Answer 1

It looks like Vertical & HorizontalAlignment affects the internal drawing of a DrawImage. So depending on VerticalAlignment, a single horizontal line will be drawn at the top, center, or bottom of the final Image. I am now embedding the Drawing in a FrameworkElement with the needed absolute positioning.

Corrected per Liz’s comment.