// vypocita rovnobeznou primku
public static Point[] LineOffset(Point pt1, Point pt2, double offset)
{
Vector vv = pt2.Minus(pt1), // vektor
nv = Funcs2D.VectorNormal(vv); // kolmy vektor
Point[] ret = new Point[2];
if (Funcs2D.IsNull(vv))
{
ret[0] = pt1;
ret[1] = pt2;
return(ret);
}
;
double len = vv.Length, // delka primky
kn = offset / len; // delkovy koeficient offsetu
// prvni bod
ret[0].X = pt1.X + (kn * nv.X);
ret[0].Y = pt1.Y + (kn * nv.Y);
// druhy bod
ret[1].X = ret[0].X + vv.X;
ret[1].Y = ret[0].Y + vv.Y;
return(ret);
}
public static Point LineRelPtOffset(Point pt1, Vector vv, double rel, double offset)
{
Point ret = new Point();
Vector nv = Funcs2D.VectorNormal(vv); // kolmy vektor
if (Funcs2D.IsNull(vv))
{
return(ret);
}
double len = vv.Length, // delka primky
kn = offset / len; // delkovy koeficient offsetu
Point pt = PointOnLine(pt1, vv, rel);
ret.X = pt.X + (kn * nv.X);
ret.Y = pt.Y + (kn * nv.Y);
return(ret);
}
public bool IsNull()
{
return(Funcs2D.IsNull(myVc));
}