private async Task <CIMLabelClass> CreateAndApplyLabelClassAsync(FeatureLayer featureLayer)
{
var labelClass = await QueuedTask.Run(() =>
{
var labelSelectedFeaturesWithLength = new CIMLabelClass
{
Name = "LabelSelectedManyFeaturesWithLength",
ExpressionEngine = LabelExpressionEngine.Arcade,
Expression = "$feature.MILES",
WhereClause = $"LabelOn = 'Yes'",
TextSymbol = SymbolFactory.Instance.ConstructTextSymbol().MakeSymbolReference(),
Visibility = true
};
var lyrDefn = featureLayer.GetDefinition() as CIMFeatureLayer;
var listLabelClasses = lyrDefn.LabelClasses.ToList();
listLabelClasses.Add(labelSelectedFeaturesWithLength);
lyrDefn.LabelClasses = listLabelClasses.ToArray();
featureLayer.SetDefinition(lyrDefn);
return(labelSelectedFeaturesWithLength);
});
return(labelClass);
}
/// <summary>
/// Create a label for the weather feature layer.
/// </summary>
/// <param name="weatherLayer"></param>
public static void SetLabeling(FeatureLayer weatherLayer)
{
// Get the CIMFeatureLayer definition.
CIMFeatureLayer weatherLayerDefinition = weatherLayer.GetDefinition() as CIMFeatureLayer;
// Get the label classes - we need the first one
CIMLabelClass weatherLabelClass = weatherLayerDefinition.LabelClasses.FirstOrDefault();
if (weatherLabelClass != null)
{
// Create a new Arcade label expression.
if (DamlSettings.Default.Celius)
{
weatherLabelClass.Expression = "$feature.Temperature + \" c \\r\" +$feature.Humidity + \" % \"";
}
else
{
weatherLabelClass.Expression = "(($feature.Temperature * 1.8) + 32)+ \" F \\r\" +$feature.Humidity + \" % \"";
}
// Create a polygon symbol for the halo
CIMPolygonSymbol textHalo = SymbolFactory.Instance.ConstructPolygonSymbol(ColorFactory.Instance.WhiteRGB, SimpleFillStyle.Solid);
// Create text symbol using the halo polygon
CIMTextSymbol weatherTextSymbol = SymbolFactory.Instance.ConstructTextSymbol(ColorFactory.Instance.BlackRGB, 14, "Corbel", "Regular");
weatherTextSymbol.HaloSymbol = textHalo;
weatherTextSymbol.HaloSize = 1;
weatherTextSymbol.HaloSymbol.SetOutlineColor(ColorFactory.Instance.WhiteRGB);
// Set the text symbol
weatherLabelClass.TextSymbol.Symbol = weatherTextSymbol;
// Update the layer definition
weatherLayer.SetDefinition(weatherLayerDefinition);
}
}
