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PortfolioManager/DataSeriesViewModels/CompositeDataSource.cs

@@ -1,3 +1,4 @@
+using System;
 using CommunityToolkit.Mvvm.ComponentModel;
 using Eremex.AvaloniaUI.Charts;
 
@@ -6,5 +7,20 @@ namespace PortfolioManager.DataSeriesViewModels
   public partial class CompositeDataSource : ObservableObject
   {
     [ObservableProperty] ISeriesDataAdapter dataAdapter;
+    public (DateTime[],double[]) ToXYData()
+    {
+      double[] values = default;
+      DateTime[] dates = default;
+
+      if (null == DataAdapter) return (dates, values);
+      values = new double[DataAdapter.ItemCount];
+      dates = new DateTime[DataAdapter.ItemCount];
+      for (int index = 0; index < DataAdapter.ItemCount; index++)
+      {
+        values[index] = DataAdapter.GetNumericalValue(index, SeriesDataMemberType.Value);
+        dates[index] = DataAdapter.GetDateTimeValue(index, SeriesDataMemberType.Value1);
+      }
+      return (dates, values);
+    }
   }
 }