// Copyright (c) Six Labors.
// Licensed under the Six Labors Split License.

using System;

namespace SixLabors.PolygonClipper {
  /// <summary>
  /// Classifies sweep vertices by local-extrema role during bound construction.
  /// </summary>
  /// <remarks>
  /// The self-intersection sweep decomposes each contour into monotonic bounds that
  /// start at local minima and terminate at local maxima. These flags annotate
  /// each <see cref="SweepVertex"/> with that role.
  /// </remarks>
  [Flags]
  internal enum VertexFlags
  {
      /// <summary>
      /// No extrema role is assigned.
      /// </summary>
      None = 0,

      /// <summary>
      /// Marks a local maximum vertex (bound endpoint).
      /// </summary>
      LocalMax = 1 << 0,

      /// <summary>
      /// Marks a local minimum vertex (bound start).
      /// </summary>
      LocalMin = 1 << 1
  }
}