public bool IsOnShortLine(clsPoint3d pt1, double aTol = 0, bool excludeEnds = false)
{
clsLine3d l1 = default(clsLine3d);
clsLine3d l2 = default(clsLine3d);
double d = 0;
if (aTol == 0)
{
aTol = mdlGeometry.myTol;
}
if (Abs(DistanceToPoint(pt1)) > aTol)
{
return(false);
}
l1 = new clsLine3d(P1, pt1);
l2 = Copy();
l2.Normalise();
d = l1.Dot(l2);
if (d < -aTol)
{
return(false);
}
if (d > Length + aTol)
{
return(false);
}
if (excludeEnds && (P1 == pt1 | P2 == pt1))
{
return(false);
}
return(true);
}
public double Lambda(clsPoint3d pt1)
{
clsLine3d l1 = default(clsLine3d);
clsLine3d l2 = default(clsLine3d);
l1 = new clsLine3d(P1, pt1);
l2 = Copy();
l2.Normalise();
return(l1.Dot(l2) / Length);
}
public static clsPoint3d ProjectPoint(clsPoint3d p1, clsLine3d l1)
{
double d1 = 0;
clsLine3d l2 = new clsLine3d();
clsLine3d l3 = new clsLine3d();
l2 = l1.Copy();
l2.Normalise();
l3 = new clsLine3d(l1.P1, p1);
d1 = l2.Dot(l3);
l2.Length = d1;
return(l2.P2);
}
public double DistanceToPoint(clsPoint3d aPt)
{
double d1 = 0;
double d2 = 0;
clsLine3d l2 = default(clsLine3d);
clsLine3d l3 = default(clsLine3d);
l2 = Copy();
l2.Normalise();
l3 = new clsLine3d(P1, aPt);
d1 = l2.Dot(l3);
d2 = l3.Length;
return(Sqrt(Pow(d2, 2) - Pow(d1, 2)));
}
public static double Dist3d(clsPoint3d p1, clsLine3d l1)
{
double d1 = 0;
double d2 = 0;
clsLine3d l2 = new clsLine3d();
clsLine3d l3 = new clsLine3d();
l2 = l1.Copy();
l2.Normalise();
l3 = new clsLine3d(l1.P1, p1);
d1 = l2.Dot(l3);
d2 = l3.Length;
return(Sqrt(Pow(d2, 2) - Pow(d1, 2)));
}
public static clsPoint3d ProjectPointOntoPlaneAlongZ(clsPoint p, clsLine3d l1)
{
clsLine3d v1 = new clsLine3d();
double u = 0;
double r = 0;
double z = 0;
clsPoint3d p1 = new clsPoint3d();
v1 = new clsLine3d(new clsPoint3d(0, 0, 0), new clsPoint3d(0, 0, 1));
u = v1.Dot(l1);
//This is the length of the normal vector, measured in the vertical direction
p1 = new clsPoint3d(p.X - l1.X1, p.Y - l1.Y1, 0 - l1.Z1);
r = p1.Dot(l1.DP());
//r is the distance of our point to the nearest point on the plane
//r = v1.Dot(myV)
z = r / u;
//z is the vertical distance of our point to the plane. It is sign sensitive - positive is above the plane.
return(new clsPoint3d(p.X, p.Y, -z));
}
