#453 – The UseLayoutRounding Property Aligns Things to Pixel Boundaries

Because WPF position GUI elements using device-independent units, small GUI elements can look fuzzy when rendered, due to anti-aliasing.

Notice that the edges of the Border elements are a little fuzzy in the example below.  Each element should have a width of 2 on this device, but the anti-aliasing leads to fuzzy edges.

The fuzzy edges are even more apparent if you zoom in.

You can prevent fuzziness due to anti-aliasing by setting the UseLayoutRounding property of a FrameworkElement to true.  Setting this property to true tells the layout system to line elements up with pixel boundaries, which prevents anti-aliasing.  This is known as pixel snapping.

Setting UseLayoutRounding to true on the parent Grid in the example above leads to consistently sized Border elements (2 pixels wide on a 96 dpi display).

 

About Sean
Software developer in the Twin Cities area, passionate about .NET technologies. Equally passionate about my own personal projects related to family history and preservation of family stories and photos.

One Response to #453 – The UseLayoutRounding Property Aligns Things to Pixel Boundaries

  1. Pingback: #454 – UseLayoutRounding vs. SnapsToDevicePixels « 2,000 Things You Should Know About WPF

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