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copied!<p>I've done something similar before by using a MultiBinding and a converter.</p> <p>You bind the top of the textblock, as a multibinding to the Y of the first point and the Y of the second point and use a converter to average them to a single value, then repeat for the Left = average of X's.</p> <p>Something like</p> <pre><code><Canvas.Left> <MultiBinding Converter="{StaticResource findCentreConverter}"> <Binding ElementName=yourLine, Path=X1/> <Binding ElementName=yourLine, Path=X2/> </MultiBinding> </Canvas.Left> </code></pre> <p>repeat for Canvas.Top</p> <p>and your FindCentreConverter is something like</p> <pre><code>public class FindCentreMultiConverter : IMultiValueConverter { public object Convert(object[] values, Type targetType, object parameter, System.Globalization.CultureInfo culture) { var point1 = (double)values[0]; var point2 = (double)values[1]; return (double)((point1 + point2) / 2.0d); } public object[] ConvertBack(object value, Type[] targetTypes, object parameter, System.Globalization.CultureInfo culture) { throw new NotImplementedException(); } } </code></pre> <p>Obviously this will put the text starting at the centre of the line, but you can modify the converter to take additional values or a parameter, such as an offset for the X/Y to avoid this. Have a look at <a href="http://msdn.microsoft.com/en-us/library/system.windows.data.multibinding.aspx" rel="nofollow">http://msdn.microsoft.com/en-us/library/system.windows.data.multibinding.aspx</a> for an example with a parameter .</p>

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