Re: Need to update polyline points after moving/dragging the polyline

Thanks Walter,

I realize that the point's position is relative to the container it's in,
however, I just discovered its not as 'straight-forward' as that. For
example, if I create a polyline like this:
<Polyline.Points>
<Point X="50" Y="50"></Point>
<Point X="100" Y="50"></Point>
</Polyline.Points>

and then I try to find it's position in the canvas like this:

Canvas.GetTop(myPolyline)
and
Canvas.GetLeft(myPolyline)

I will get 0,0 where I would be expecting 50,50. This is what was confusing
me. When ever I used GetTop and GetLeft I was getting incorrect
coordinates.

However, if I ALWAYS create the polyline (or any other shape or object I
assume) starting with it's top-left corner at 0,0 like this:

<Polyline.Points>
<Point X="0" Y="0"></Point>
<Point X="50" Y="0"></Point>
</Polyline.Points>

then no mater where I drag it to, I should then be able to get it's correct
position via GetTop and GetLeft.

ALSO, its interesting to note (although I dont understand it yet), if I
create the polyline like this:
<Point X="50" Y="50"></Point>
<Point X="100" Y="50"></Point>
then I can never drag it to the to the left or above that position bevause
it things that this position is the top/left corner of the container. Is
this a bug?

I have not seen this documented anywhere so it would be nice to make the
documentaion about this more visible.

As always Walter, thanks!



"Walter Wang [MSFT]" <wawang@xxxxxxxxxxxxxxxxxxxx> wrote in message
news:UaRp%23sSRHHA.2356@xxxxxxxxxxxxxxxxxxxxxxxxx
Hi moondaddy,

A Point's position is relative to its container, in this case, the
container is the Polyline. When you drag and move the Polyline on the
Canvas, the Polyline's position is also relative to the Canvas and it's
only the Polyline's position get changed, the Points in the Polyline is
not
changed.

You can verify this behavior by using following simple XAML and modify the
Canvas.Left/Top and observe the behavior:


<Canvas Name="myCanvas">
<Polyline Name="myPolyline" Canvas.Left="50" Canvas.Top="50"
Stroke="Blue" StrokeThickness="2">
<Polyline.Points>
<Point X="0" Y="0"></Point>
<Point X="100" Y="100"></Point>
</Polyline.Points>
</Polyline>

#The Layout System
http://msdn2.microsoft.com/en-us/library/ms745058.aspx#LayoutSystem_Measure_
Arrange

Sincerely,
Walter Wang (wawang@xxxxxxxxxxxxxxxxxxxx, remove 'online.')
Microsoft Online Community Support

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