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    <p>Your vertical jumping problem is due to font rendering rounding. Specifically, WPF will avoid subpixel font height in order to enable font smoothing. One way to avoid this is to convert your text into a path geometry and then use a scale transform to animate it.</p> <p>Here is an alternate version of your example without the jumping. The new XAML is:</p> <pre><code>&lt;Grid&gt; &lt;Path Name="Path" HorizontalAlignment="Center" VerticalAlignment="Center"/&gt; &lt;/Grid&gt; </code></pre> <p>and the new code when you load the window:</p> <pre><code>SetText(""); var transform = new ScaleTransform(1, 1); Path.LayoutTransform = transform; var animationX = new DoubleAnimation(1, 10, new Duration(TimeSpan.FromSeconds(60))); transform.BeginAnimation(ScaleTransform.ScaleXProperty, animationX); var animationY = new DoubleAnimation(1, 10, new Duration(TimeSpan.FromSeconds(60))); transform.BeginAnimation(ScaleTransform.ScaleYProperty, animationY); </code></pre> <p>and a new method to set the text that is anmiated:</p> <pre><code>private void SetText(string text) { var formatted = new FormattedText(text, CultureInfo.CurrentCulture, FlowDirection.LeftToRight, new Typeface("Lucida Console"), 12, Brushes.Black); Path.Data = formatted.BuildGeometry(new Point(0, 0)); Path.Fill = Brushes.Black; } </code></pre> <p>and you have call SetText from your timer event handler.</p> <p>Note that to avoid horizontal jumpiness, you have to use a fixed-length text string and a constant-width font.</p>
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    1. USRick Sladkey
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    1. CO+ 1 Very nice. The text is now animated smoothly, however, there is slight aliasing on the text as it grows. Is this expected?
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      1. USTim Lloyd
    2. COSub-pixel anti-aliasing is essential for the smoothness of the animation so it's a trade-off: crisp text or smooth animation.
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    3. CONice one. Too bad you are limited to the fixed-length text string and a constant-width fonts though, but there's no other way to center align the text.
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