topic Centering a Graphic on a GPS coordinate in ArcGIS API for Silverlight Questions

Centering a Graphic on a GPS coordinate

AlexAgranov — Mon, 11 Oct 2010 17:00:53 GMT

I figured out that I need to set the OffsetX/OffsetY properties. Hardcoding the values managed to center it, but I'd much prefer to calculate the values based on the total size of the ControlTemplate I'm using. Unfortunately I can't seem to find a way to get the size of that at run time.

Re: Centering a Graphic on a GPS coordinate

dotMorten_esri — Mon, 11 Oct 2010 18:59:36 GMT

If you use a custom symbol template, try and place your element so it's centered at 0,0 in it's local coordinate system regardless of size, and you won't have to muck around with offsets.

Re: Centering a Graphic on a GPS coordinate

AlexAgranov — Mon, 11 Oct 2010 20:12:09 GMT

If you use a custom symbol template, try and place your element so it's centered at 0,0 in it's local coordinate system regardless of size, and you won't have to muck around with offsets.

More specifically what's happening is template's left top corner is placed on the GPS coordinate. I'm not sure what you mean by local coordinate system for the template relative to the map?

Re: Centering a Graphic on a GPS coordinate

dotMorten_esri — Wed, 13 Oct 2010 20:17:04 GMT

I mean relative to the symbol element.
Ie. centering rectangle on the parent grid's 0,0 using negative margin (If root is a Canvas, use Canvas.Left/Top):
<ControlTemplate>
<Grid>
<Rectangle Margin="-10,-10,0,0" Width="20" Height="20" Fill="Green" />
</Grid>
</ControlTemplate>