/// <summary>
///
/// </summary>
/// <param name="p0"></param>
/// <param name="p1"></param>
protected void Init(Coordinate p0, Coordinate p1)
{
_p0 = p0;
_p1 = p1;
_dx = p1.X - p0.X;
_dy = p1.Y - p0.Y;
_quadrant = QuadrantOp.Quadrant(_dx, _dy);
Assert.IsTrue(!(_dx == 0 && _dy == 0), "EdgeEnd with identical endpoints found");
}
/// <summary>
/// The coordinate pairs match if they define line segments lying in the same direction.
/// E.g. the segments are parallel and in the same quadrant
/// (as opposed to parallel and opposite!).
/// </summary>
/// <param name="p0"></param>
/// <param name="p1"></param>
/// <param name="ep0"></param>
/// <param name="ep1"></param>
private static bool MatchInSameDirection(Coordinate p0, Coordinate p1, Coordinate ep0, Coordinate ep1)
{
if (!p0.Equals(ep0))
{
return(false);
}
if (Orientation.Index(p0, p1, ep1) == OrientationIndex.Collinear &&
QuadrantOp.Quadrant(p0, p1) == QuadrantOp.Quadrant(ep0, ep1))
{
return(true);
}
return(false);
}