topic Re: drill down on map in ArcGIS API for Silverlight Questions

drill down on map

ThaoNguyen — Wed, 09 Jun 2010 17:54:12 GMT

Hi,
I'm looking for a sample that when I double click a selected state, the map is zoomed in at street level of that state. I tried MyMap.Zoom(), but sometimes the selected state is out of view. Is there a way we can get the position of the selected state and zoom in the middle?

I also create a context menu which has Drill down option, clicking on this option will do the same as above. Again, I want to do what I state above, but haven't found a way :(.

The drill down event handler method:

void drillDownMenuItem_Click(object sender, RoutedEventArgs e)
        {
            MyMap.Zoom(2.0); //test
         }

Thanks!!

Re: drill down on map

dotMorten_esri — Wed, 09 Jun 2010 19:28:58 GMT

You can zoom to any geometry, so if you have the geometry or envelope of the state, you can simply do:
myMap.ZoomTo(geometry);

This will fit the state in the view.

Re: drill down on map

ThaoNguyen — Tue, 15 Jun 2010 14:05:44 GMT

You can zoom to any geometry, so if you have the geometry or envelope of the state, you can simply do:
myMap.ZoomTo(geometry);

This will fit the state in the view.

Thanks!
This is another question but is related to drilldown.

On a map, I have 3 states selected or highlighted, when right clicking 1 state, a menu is displayed and I can select "Drill down" option. I want to get the geometry of the clicked point, then do the query task which returns me the data of that state. I am able to do the query task, but now, I don't know how to get the right geometry of the clicked state. As you know, giving the wrong geometry will return wrong data.
I really appreciate your help!!

Re: drill down on map

dotMorten_esri — Tue, 15 Jun 2010 15:38:47 GMT

Do you want the polygon of the state, or the point of where you right-clicked?

Re: drill down on map

ThaoNguyen — Tue, 15 Jun 2010 16:01:53 GMT

Do you want the polygon of the state, or the point of where you right-clicked?

I tried the point where I clicked, but it didn't work right. When setting the geometry of the point to Query object, it doesn't return any data. I guess I need the Polygon, but I don't know all the numbers to create the Polygon.

The way I get the point is MouseButtonEventArgs.getPosition(myMap), then I create a MapPoint object using the Point x and y. Don't know what I missed.

Re: drill down on map

DominiqueBroux — Wed, 16 Jun 2010 09:26:20 GMT

The geometry doesn't need to be a polygon. It's working with a point as well.
Here is a sample : http://help.arcgis.com/en/webapi/silverlight/samples/start.htm#SpatialQuery

It looks like you missed to convert the screen coordinates to map coordinates.
Add something like:

mapPoint = myMap.ScreenToMap(point);

Re: drill down on map

ThaoNguyen — Wed, 16 Jun 2010 12:13:45 GMT

The geometry doesn't need to be a polygon. It's working with a point as well.
Here is a sample : http://help.arcgis.com/en/webapi/silverlight/samples/start.htm#SpatialQuery

It looks like you missed to convert the screen coordinates to map coordinates.
Add something like:
mapPoint = myMap.ScreenToMap(point);

Thanks!! Using ScreenToMap works. I didn't know this. Yes, I agree that it doesn't have to be a polygon, I was answering the previous question by another member about either point or polygon. Point didn't work for me before converting to map point.
I'm very new to esri wpf.