source: branches/HeuristicLab.Problems.GrammaticalOptimization/DynamicDataDisplay/Charts/Isolines/Enums.cs @ 12747

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;
      }
    }
  }
}