how to add leader lines to the labels i have created in arcgis pro sdk?

RishabhRaj29

Hi all,

I have a feature layer which has single part and multi part features. I have created labels for each multi part and single part features using mapleslabelengine in sdk and these are coming fine.

 

I want to add leader lines to each label so that it seems easier to understand where is the feature (even if it’s really small) in the layout pdf that i am exporting.

I am lost as to where to start and how to achieve this.

 

Any help is appreciated. I am working with Pro 2.9.8.

 

RishabhRaj29

Here is the updated response with the code snippet:

QueuedTask.Run(() =>
{
var lyrDefn = featureLayer.GetDefinition() as CIMFeatureLayer;
var textSymbol = SymbolFactory.Instance.ConstructTextSymbol(ColorFactory.Instance.BlackRGB, 12, "Arial", "Regular");
textSymbol.OffsetY = 45.0;
var maplexLabelPlacementProps = new CIMMaplexLabelPlacementProperties
{
FeatureType = LabelFeatureType.Polygon,
LabelLargestPolygon = false,
CanRemoveOverlappingLabel = false,
PolygonPlacementMethod = MaplexPolygonPlacementMethod.HorizontalInPolygon,
CanPlaceLabelOutsidePolygon = true,
PolygonAnchorPointType = MaplexAnchorPointType.ErodedCenter,
IsOffsetFromFeatureGeometry = true,
MultiPartOption = MaplexMultiPartOption.OneLabelPerPart,
PrimaryOffset = 10.0
};
//End arrow
var arrow = SymbolFactory.Instance.ConstructMarker(63, "ESRI Arrowhead", "Regular", 10, ColorFactory.Instance.BlackRGB) as CIMCharacterMarker;
//Marker placement on end - Both, JustBegin, JustEnd
var endMarkerPlacement = new CIMMarkerPlacementAtExtremities()
{
ExtremityPlacement = ExtremityPlacement.JustEnd,
PlacePerPart = true,
AngleToLine = true
};
arrow.MarkerPlacement = endMarkerPlacement;
var symbol_layers = new List<CIMSymbolLayer>();
symbol_layers.Add(arrow);
var stroke = SymbolFactory.Instance.ConstructStroke(ColorFactory.Instance.BlackRGB, 2.0, SimpleLineStyle.Solid);

// Create a callout
//CIMLineSymbol lineSymbol = SymbolFactory.Instance.ConstructLineSymbol(ColorFactory.Instance.BlackRGB, 2.0, SimpleLineStyle.Solid);
symbol_layers.Add(stroke);
var CIMLineSymbol = new CIMLineSymbol()
{
SymbolLayers = symbol_layers.ToArray()
};
ArcGIS.Core.CIM.CIMSimpleLineCallout callout = new ArcGIS.Core.CIM.CIMSimpleLineCallout
{
LeaderTolerance = 1.0,
LeaderOffset = 4.0,
//LineSymbol = lineSymbol,
LineSymbol = CIMLineSymbol,
AutoSnap = true

};
textSymbol.Callout = callout;

var lyrsLabelsClasses = lyrDefn.LabelClasses.ToList();
var theLabelClass = lyrsLabelsClasses.FirstOrDefault();
theLabelClass.ExpressionEngine = LabelExpressionEngine.Arcade;
//theLabelClass.Expression = "return $feature.name;";
theLabelClass.Expression = "'Test'";
theLabelClass.TextSymbol = textSymbol.MakeSymbolReference();
theLabelClass.MaplexLabelPlacementProperties = maplexLabelPlacementProps;
lyrDefn.LabelClasses = lyrsLabelsClasses.ToArray(); //Set Label Class back to definition
featureLayer.SetDefinition(lyrDefn); //set the layer's definition;
featureLayer.SetLabelVisibility(true);
});