creating balloon callout on graphics layer

LeLuong

All,

Has anyone successfully created a balloon callout on graphics layer by codes ?  I asked this question before with previous version of arcgis Pro.  I was under the impression with version 2.8 I should be able to do it but no luck so far.  Below is my codes.  I got all other properties correct but NO callout arrow.   Thanks in advance for your help.

Not a callout

 

 _subjectTextSymbol = await CreateBalloonCalloutAsync(ColorFactory.Instance.RedRGB);
.
.
.
 subjectLabelGraphic.Text = "Subject";
                            subjectLabelGraphic.Symbol = _subjectTextSymbol.MakeSymbolReference();
                            //Add the graphic label
                            graphicsLayer.AddElement(subjectLabelGraphic);
.
.
.


private static Task<CIMTextSymbol> CreateBalloonCalloutAsync(CIMColor textColor)
        {
            return QueuedTask.Run<CIMTextSymbol>(() =>
            {
                //create a text symbol
                var textSymbol = SymbolFactory.Instance.ConstructTextSymbol(textColor, 11, "Corbel", "Regular");
                //A balloon callout
                var balloonCallout = new CIMBalloonCallout();
                //set the callout's style
                balloonCallout.BalloonStyle = BalloonCalloutStyle.RoundedRectangle;
                //Create a solid fill polygon symbol for the callout.
                var polySymbol = SymbolFactory.Instance.ConstructPolygonSymbol(ColorFactory.Instance.GreyRGB, SimpleFillStyle.Solid);
                //Set the callout's background to be the black polygon symbol
                balloonCallout.BackgroundSymbol = polySymbol;
                //margin inside the callout to place the text
                balloonCallout.Margin = new CIMTextMargin
                {
                    Left = 5,
                    Right = 5,
                    Bottom = 5,
                    Top = 5
                };
                //assign the callout to the text symbol's callout property
                textSymbol.Callout = balloonCallout;
                return textSymbol;
            });
        }

 

CharlesMacleod

Looks like the leader is part of the graphic not the symbol. I made a text graphic in the UI and added a leader to it then deconstructed the CIM xml.

Note that, w/ a map via graphics layer, the leader position is specified in map units (not page units/points). In my case, the base map is the World Topo in Web Mercator, meters. The leader offset (in the symbol) seems to be the minimum distance beyond which a leader is shown.

 

var graphicsLayer = MapView.Active.Map.TargetGraphicsLayer;
      //This is your method
      var textSymbol = await CreateBalloonCalloutAsync(ColorFactory.Instance.WhiteRGB);
      var textGraphic = new CIMTextGraphic()
      {
        Text = "Callout Text",
        Placement = Anchor.CenterPoint,
        Symbol = textSymbol.MakeSymbolReference(),
        Shape = MapView.Active.Extent.Center,
        //Leaders is an array of CIMLeader - add a Leader point to show
        //the leader, remove Leaders to hide the leader.
        Leaders = new CIMLeader[] { new CIMLeaderPoint()
        {
          //for a graphics layer, the leader location is in map coords
          Point = MapPointBuilderEx.CreateMapPoint(MapView.Active.Extent.Center.X - 5000,
                                                      MapView.Active.Extent.Center.Y - 1500)
        }
        }
      };
      QueuedTask.Run(() =>
      {
        graphicsLayer.AddElement(textGraphic);
      });