topic Re: Graphics layer: element placement in ArcGIS Pro SDK Questions

Graphics layer: element placement

helenchu — Mon, 14 Sep 2020 06:49:06 GMT

I'm trying to have an element placed at the bottom left corner of the selected feature but can't figure out how to do it. I can place it at the center of the polygon fine but not at any other positions. Your help is much appreciated.

while (foundCursor.MoveNext())
{
using (var row = foundCursor.Current)
{
var shape = row as Feature;
var poly = shape.GetShape() as Polygon;
myLabelGraphic.Shape = poly.Extent;
myLabelGraphic.Placement = Anchor.BottomLeftCorner;

}

Re: Graphics layer: element placement

UmaHarano — Sun, 12 Dec 2021 10:45:41 GMT

Hi Helen,

You have almost all the logic in

Once you get the polygon of your feature, you need to get its lower left corner coordinates. Use that for the graphic's shape property. So like this:

var poly = currentRow.GetShape() as Polygon;
var lowerLeftX = poly.Extent.XMin;
var lowerLeftY = poly.Extent.YMin;‍‍‍
myLabelGraphic.Shape = //Create MapPoint using these coordinates.‍‍‍‍

Thanks

Uma

Re: Graphics layer: element placement

helenchu — Sun, 12 Dec 2021 10:45:44 GMT

Hi Uma Harano‌,

Line 12 returns an error : graphic shape property can not be null or empty. What did I do wrong? maxPoint is not null.

Thank you!

var poly = shape.GetShape() as Polygon;
var maxX= poly.Extent.MMax;
var maxY= poly.Extent.YMax;
MapPoint maxPoint = MapPointBuilder.CreateMapPoint(maxX, maxY);
if (maxPoint != null)
{
 myLabelGraphic.Shape = maxPoint;
 myLabelGraphic.Placement = Anchor.CenterPoint;
 myLabelGraphic.Text = myText;
 myLabelGraphic.Symbol = myTextSymbol.MakeSymbolReference();
 graphicsLayer.AddElement(myLabelGraphic);
}‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍

Re: Graphics layer: element placement

UmaHarano — Tue, 15 Sep 2020 20:19:41 GMT

Hi,

On line 2, use XMax instead. That should fix the issue.

Thanks

Uma

Re: Graphics layer: element placement

helenchu — Wed, 16 Sep 2020 14:43:57 GMT

Hi Uma,

Silly me. I was so certain I had XMax there. Thank you very much!