Initial Commit

Charts/Isolines/Enums.cs

@@ -0,0 +1,67 @@
+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;
+			}
+		}
+	}
+}