topic Re: Graphics front-back in ArcGIS API for Silverlight Questions

Graphics front-back

LuisGarcia2 — Mon, 30 Apr 2012 18:52:45 GMT

I have a graphics layer where I add several graphics. Some times the graphics are very close and there are some I would like to bring to the front so the client can have a better view of them. Is there any way to do that programmatically? I did not see anything in the API.
Thanks!

Re: Graphics front-back

JenniferNery — Tue, 01 May 2012 15:51:04 GMT

You can probably check collision by using Extent.Intersects() and setting Graphic.SetZIndex(index) or stack order of the graphic in the collection.

Re: Graphics front-back

LuisGarcia2 — Sat, 11 Dec 2021 18:52:06 GMT

Jennifer,
thanks for your reply. I tried the z order which I thought was a the fastest procedure and did not get good results. Not sure why. I got the count of graphics that I had at the specific moment in the layer so it would be the highest number possible and set the z index with that and still they were overlapping. I also tried using this:

Graphics.Move(Graphics.IndexOf(myGraphic), 0);

That does the trick when I do one by one; but if I do several at the same time the graphics disappear from the screen for an instance. That tells me that likely the "move" algorithm is more time consuming (and I think that make sense).
So, any advice with the z-index? Is that the right way to use it? I'd like to use that approach if possible so the graphics don't flicker like that.

Thanks!

Re: Graphics front-back

LuisGarcia2 — Fri, 13 Jul 2012 19:23:44 GMT

Never mind. I think I got it. What I did was to set the Z-index to 0 in all the graphics I have when I instantiate them to make sure they are all at the lowest level. When I need to show them on top of the others I set the z-index to a high number and they show the way I want. I can re-set them to zero if I want them back at the level they were first.
Thanks for your help!