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DataDisplay/DataSource/IPointDataSource.cs

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+using System;
+using System.Windows;
+using Xamarin.Forms;
+
+namespace DataDisplay.DataSource
+{
+	/// <summary>Data source that returns sequence of 2D points.</summary>
+	public interface IPointDataSource
+	{
+
+		/// <summary>Returns object to enumerate points in source.</summary>
+		IPointEnumerator GetEnumerator(BindableObject context);
+
+		/// <summary>This event is raised when contents of source are changed.</summary>
+		event EventHandler DataChanged;
+	}
+}