public static ParallelResult ParallelCheck(
Point pta, Vector da, //bod a vektor prvni primky
Point ptb, Vector db, //bod a vektor druhe primky
out Point retRel, // vraci relativni souradnice ( x = begin, y = end) na prvni primce
out bool direct) // smer vektoru primek, true stejny smer, false opacny smer
{
retRel = new Point();
direct = false;
var rr = Funcs2D.IsParallel(da, db);
if (rr == 0)
{
return(ParallelResult.Nothing);
}
direct = rr > 0;
retRel.X = Funcs2D.PointToLine(pta, da, ptb);
retRel.Y = Funcs2D.PointToLine(pta, da, ptb.Plus(db));
if (Funcs2D.IsThreePointsOnLine(pta, pta.Plus(da), ptb))
{
return(ParallelResult.ParallelOn);
}
else
{
return(ParallelResult.ParallelOut);
}
}
public static List <int> PolygonParallelEdges(IPolygonReader poly, bool closed, Vector v)
{
List <int> r = new List <int>();
Point[] p = new BoxArrayPoint(poly).Value;
for (int i = 0, j; i < p.Length; i++)
{
if (i == p.Length - 1)
{
j = 0;
}
else
{
j = i + 1;
}
if (Funcs2D.IsParallel(v, p[j].Minus(p[i])) != 0)
{
r.Add(i);
}
}
return(r);
}
