Graph paper with elongated grid sections? - wpf

Question

I am trying to make some Graph Paper using WPF using the DrawingBrush.
I found the following example on MSDN which is pretty close to what I want but not exactly. I want to do this is pure XAML. I am fairly new to WPF.
<DrawingBrush x:Key="GridTile"
Viewport="0,0,10,10"
ViewportUnits="Absolute"
TileMode="Tile">
<DrawingBrush.Drawing>
<DrawingGroup>
<GeometryDrawing Geometry="M0,0 L1,0 1,0.1, 0,0.1Z" Brush="Blue" />
<GeometryDrawing Geometry="M0,0 L0,1 0.1,1, 0.1,0Z" Brush="Red" />
</DrawingGroup>
</DrawingBrush.Drawing>
</DrawingBrush>
Currently this generates
I want to generate
with a width of 3cm and each row being 4mm
I will use this tile my background or rather the DrawingBrush TileMode takes care of that for me.

Answer 1

Change the size of the Brush so the Viewport has more height than width, and change the Geometry accordingly so the lines still appear 1px thick.
<Window x:Class="WPFTest.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="WPF" SizeToContent="WidthAndHeight">
<Window.Resources>
<DrawingBrush x:Key="GridTile" Viewport="0,0,4,16"
ViewportUnits="Absolute" TileMode="Tile">
<DrawingBrush.Drawing>
<DrawingGroup>
<GeometryDrawing Geometry="M0,0 L1,0 1,0.05 0,0.05Z" Brush="Black"/>
<GeometryDrawing Geometry="M0,0 L0,1 0.1,1 0.1,0Z" Brush="Black"/>
</DrawingGroup>
</DrawingBrush.Drawing>
</DrawingBrush>
</Window.Resources>
<Rectangle Height="512" Width="512" Stroke="Black" StrokeThickness="0"
Fill="{StaticResource GridTile}"/>
</Window>