using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Windows.Media;

using System.Windows;

using System.Windows.Shapes;



namespace Microsoft.Research.DynamicDataDisplay.Charts.Shapes

{

	/// <summary>

	/// Represents a closed filled figure with points in Viewport coordinates.

	/// </summary>

	public sealed class ViewportPolygon : ViewportPolylineBase

	{

		static ViewportPolygon()

		{

			Type type = typeof(ViewportPolygon);

			Shape.FillProperty.AddOwner(type, new FrameworkPropertyMetadata(Brushes.Coral));

		}



		/// <summary>

		/// Initializes a new instance of the <see cref="ViewportPolygon"/> class.

		/// </summary>

		public ViewportPolygon() { }



		protected override void UpdateUIRepresentationCore()

		{

			var transform = Plotter.Viewport.Transform;



			PathGeometry geometry = PathGeometry;



			PointCollection points = Points;

			geometry.Clear();



			if (points == null) { }

			else

			{

				PathFigure figure = new PathFigure();

				if (points.Count > 0)

				{

					figure.StartPoint = points[0].DataToScreen(transform);

					if (points.Count > 1)

					{

						Point[] pointArray = new Point[points.Count - 1];

						for (int i = 1; i < points.Count; i++)

						{

							pointArray[i - 1] = points[i].DataToScreen(transform);

						}

						figure.Segments.Add(new PolyLineSegment(pointArray, true));

						figure.IsClosed = true;

					}

				}

				geometry.Figures.Add(figure);

				geometry.FillRule = this.FillRule;

			}

		}

	}

}