Comment puis-je obtenir la position X et Y d'un chemin dans Silverlight?

Question

J'ai des chemins qui ne sont pas dans un canevas, et je veux savoir comment obtenir leur position X et Y pour créer des animations basées dessus.

<Grid x:Name="LayoutRoot" Width="640" Height="480"> 
     <Image Source="SC.png" Stretch="Fill" Width="640" Height="480" d:LayoutOverrides="HorizontalAlignment"/> 

     <Path x:Name="but77" DataContext="77" MouseLeftButtonDown="MapClick" MouseEnter="MouseOver" MouseLeave="MouseOut" Fill="#FF2400FF" Stretch="Fill" Stroke="Black" Height="17.5" HorizontalAlignment="Right" Margin="0,104.875,68.125,0" VerticalAlignment="Top" Width="17.875" UseLayoutRounding="False" Data="M555,105.375 L554.5,121.75 L571,121.875 L571.375,105.5 z" Opacity="0"/> 
     <Path x:Name="but51" DataContext="51" MouseLeftButtonDown="MapClick" MouseEnter="MouseOver" MouseLeave="MouseOut" Fill="#FF2400FF" Stretch="Fill" Stroke="Black" Height="17.5" HorizontalAlignment="Right" Margin="0,164.125,70.375,0" VerticalAlignment="Top" Width="17.875" Opacity="0" UseLayoutRounding="False" Data="M555,105.375 L554.5,121.75 L571,121.875 L571.375,105.5 z"/> 
     <Path x:Name="but50" DataContext="50" MouseLeftButtonDown="MapClick" MouseEnter="MouseOver" MouseLeave="MouseOut" Fill="#FF2400FF" Stretch="Fill" Stroke="Black" Height="17.5" HorizontalAlignment="Right" Margin="0,0,70.375,178.375" VerticalAlignment="Bottom" Width="17.875" Opacity="0" UseLayoutRounding="False" Data="M555,105.375 L554.5,121.75 L571,121.875 L571.375,105.5 z"/> 
     <Path x:Name="but82" DataContext="82" MouseLeftButtonDown="MapClick" MouseEnter="MouseOver" MouseLeave="MouseOut" Fill="#FF2400FF" Stretch="Fill" Stroke="Black" Height="17.5" HorizontalAlignment="Right" Margin="0,0,78.75,156.875" VerticalAlignment="Bottom" Width="17.875" Opacity="0" UseLayoutRounding="False" Data="M555,105.375 L554.5,121.75 L571,121.875 L571.375,105.5 z"/> 

</Grid> 

Answer 1

L'outil dont vous avez besoin est la méthode TransformToVisual qui est fourni par tous UIElement dérivés, y compris Path. Pour trouver la position X, Y de l'un de vos chemins par rapport à l'utilisation Grid utiliser: -

GeneralTransform gt = but77.TransformToVisual(LayoutRoot); 
Point but77Position = gt.Transform(new Point(0,0));