/Main/src/DynamicDataDisplay/Charts/Isolines/Enums.cs

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;



namespace Microsoft.Research.DynamicDataDisplay.Charts.Isolines

{

	/// <summary>

	/// Edge identifier - indicates which side of cell isoline crosses.

	/// </summary>

	internal enum Edge

	{

		// todo check if everything is ok with None.

		None = 0,

		/// <summary>

		/// Isoline crosses left boundary of cell (bit 0)

		/// </summary>

		Left = 1,

		/// <summary>

		/// Isoline crosses top boundary of cell (bit 1)

		/// </summary>

		Top = 2,

		/// <summary>

		/// Isoline crosses right boundary of cell (bit 2)

		/// </summary>

		Right = 4,

		/// <summary>

		/// Isoline crosses bottom boundary of cell (bit 3)

		/// </summary>

		Bottom = 8

	}



	[Flags]

	internal enum CellBitmask

	{

		None = 0,

		LeftTop = 1,

		LeftBottom = 8,

		RightBottom = 4,

		RightTop = 2

	}



	internal static class IsolineExtensions

	{

		internal static bool IsDiagonal(this CellBitmask bitmask)

		{

			return bitmask == (CellBitmask.RightBottom | CellBitmask.LeftTop) ||

				bitmask == (CellBitmask.LeftBottom | CellBitmask.RightTop);

		}



		internal static bool IsAppropriate(this SubCell sub, Edge edge)

		{

			switch (sub)

			{

				case SubCell.LeftBottom:

					return edge == Edge.Left || edge == Edge.Bottom;

				case SubCell.LeftTop:

					return edge == Edge.Left || edge == Edge.Top;

				case SubCell.RightBottom:

					return edge == Edge.Right || edge == Edge.Bottom;

				case SubCell.RightTop:

				default:

					return edge == Edge.Right || edge == Edge.Top;

			}

		}

	}

}