/// <summary>
/// Returns the pair of segments that join at the point specified by index.
/// If the point is the first or last point, the leading or following segment will be null.
/// </summary>
/// <param name="pointIndex">Index of the point.</param>
/// <returns>Tuple<IPathSegment, IPathSegment>.</returns>
public Tuple <IPathSegment, IPathSegment> AdjacentSegmentsAt(int pointIndex)
{
PointBoundary boundary = PointBoundary();
if (pointIndex < 0 || pointIndex > boundary.Count - 1)
{
throw new IndexOutOfRangeException();
}
return(AdjacentSegments(boundary[pointIndex]));
}
/// <summary>
/// Returns the points that define the boundary between segments.
/// </summary>
/// <returns>PointBoundary.</returns>
public PointBoundary PointBoundary()
{
PointBoundary pointBoundary = new PointBoundary();
for (int i = 0; i < Count; i++)
{
pointBoundary.Add(_contents[i].I);
}
pointBoundary.Add(LastPoint());
return(pointBoundary);
}
