/// <summary>
/// Find next subsegment in sequence. [next(ab) -> b*]
/// </summary>
/// <remarks>snext() finds the next subsegment (from the same segment) in
/// sequence; one whose origin is the input subsegment's destination.
/// </remarks>
public void Next(ref Osub o2)
{
o2 = seg.subsegs[1 - orient];
//sdecode(sptr, o2);
}
/// <summary>
/// Reverse the orientation of a subsegment. [sym(ab) -> ba]
/// </summary>
/// <remarks>ssym() toggles the orientation of a subsegment.
/// </remarks>
public void Sym(ref Osub o2)
{
o2.seg = seg;
o2.orient = 1 - orient;
}
/// <summary>
/// Find adjoining subsegment with the same origin. [pivot(ab) -> a*]
/// </summary>
/// <remarks>spivot() finds the other subsegment (from the same segment)
/// that shares the same origin.
/// </remarks>
public void Pivot(ref Osub o2)
{
o2 = seg.subsegs[orient];
//sdecode(sptr, o2);
}
/// <summary>
/// Test for equality of subsegments.
/// </summary>
public bool Equal(Osub o2)
{
return((seg == o2.seg) && (orient == o2.orient));
}
/// <summary>
/// Copy a subsegment.
/// </summary>
public void Copy(ref Osub o2)
{
o2.seg = seg;
o2.orient = orient;
}
/// <summary>
/// Bond two subsegments together. [bond(abc, ba)]
/// </summary>
public void Bond(ref Osub o2)
{
seg.subsegs[orient] = o2;
o2.seg.subsegs[o2.orient] = this;
}
/// <summary>
/// Bond a triangle to a subsegment.
/// </summary>
public void SegBond(ref Osub os)
{
triangle.subsegs[orient] = os;
os.seg.triangles[os.orient] = this;
}
/// <summary>
/// Finds a subsegment abutting a triangle.
/// </summary>
public void SegPivot(ref Osub os)
{
os = triangle.subsegs[orient];
//sdecode(sptr, osub)
}