#392 – Use SnapsToDevicePixels Property to Prevent Anti-Aliasing

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

Notice the inconsistent appearance of the vertical lines in the example below. Every line should be the same width, since they were defined to be 1 WPF unit wide (1 pixel at 96 dpi).

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

Setting SnapsToDevicePixels to true on the parent ListBox in the above example leads to vertical lines that are consistently sized (1 pixel 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 #392 – Use SnapsToDevicePixels Property to Prevent Anti-Aliasing

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

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