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    <p>A Viewbox can only "visually" scale its child element, including the thickness of any rendered stroke. What you need is a scaling that only applies to the geometry of the lines (or other shapes), but leaves the stroke unaffected.</p> <p>Instead of using <code>Line</code> objects, you could draw your lines by <a href="http://msdn.microsoft.com/en-us/library/ms615632.aspx" rel="noreferrer"><code>Path</code></a> objects that use transformed <a href="http://msdn.microsoft.com/en-us/library/ms635204.aspx" rel="noreferrer">LineGeometries</a> for their <a href="http://msdn.microsoft.com/en-us/library/system.windows.shapes.path.data.aspx" rel="noreferrer"><code>Data</code></a> property. You could create a <a href="http://msdn.microsoft.com/en-us/library/ms635521.aspx" rel="noreferrer"><code>ScaleTransform</code></a> that scales from logical coordinates to viewport coordinates by using the Grid's width and height as scaling factors in x and y direction. Each LineGeometry (or any other Geometry) would use logical coordinates in the range 0..1:</p> <pre><code>&lt;Grid x:Name="grid"&gt; &lt;Grid.Resources&gt; &lt;ScaleTransform x:Key="transform" ScaleX="{Binding ActualWidth, ElementName=grid}" ScaleY="{Binding ActualHeight, ElementName=grid}"/&gt; &lt;/Grid.Resources&gt; &lt;Path Stroke="Black" StrokeThickness="1"&gt; &lt;Path.Data&gt; &lt;LineGeometry StartPoint="0.1,0.1" EndPoint="0.9,0.9" Transform="{StaticResource transform}"/&gt; &lt;/Path.Data&gt; &lt;/Path&gt; &lt;/Grid&gt; </code></pre> <hr> <p>In order to get a uniform scaling you may simply bind both the ScaleTransform's <code>ScaleX</code> and <code>ScaleY</code> properties to either the <code>ActualWidth</code> or <code>ActualHeight</code> of the Grid:</p> <pre><code>&lt;Grid x:Name="grid"&gt; &lt;Grid.Resources&gt; &lt;ScaleTransform x:Key="transform" ScaleX="{Binding ActualWidth, ElementName=grid}" ScaleY="{Binding ActualWidth, ElementName=grid}"/&gt; &lt;/Grid.Resources&gt; ... &lt;/Grid&gt; </code></pre> <p>You may also calculate the uniform scaling factor from the minimum value of the width and height, with a bit of code behind:</p> <pre><code>&lt;Grid x:Name="grid" SizeChanged="grid_SizeChanged"&gt; &lt;Grid.Resources&gt; &lt;ScaleTransform x:Key="transform"/&gt; &lt;/Grid.Resources&gt; ... &lt;/Grid&gt; </code></pre> <p>with a SizeChanged handler like this:</p> <pre><code>private void grid_SizeChanged(object sender, SizeChangedEventArgs e) { var transform = grid.Resources["transform"] as ScaleTransform; var minScale = Math.Min(grid.ActualWidth, grid.ActualHeight); transform.ScaleX = minScale; transform.ScaleY = minScale; } </code></pre>
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    1. POMaintaining fixed-thickness lines in WPF with Viewbox scaling/stretching
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    1. COThanks for clarifying the differences in geometry rendering. I've reworked my code using Paths and edited my original question with my findings.
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    2. COThe bindings on the ScaleTransform are in place, and I've implemented the SizeChanged handler, but on resizing the window, the grid still stretches without a fixed ratio.
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    3. COI thought we were talking about how to maintain the line thickness, not layout in general. Anyway, in order to keep the Grid square you might for example bind its Height to its ActualWidth. There is certainly more than one way to achieve that, depending on your overall layout.
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