bool check_collinear(Pt &a, Pt &b, Pt &c)
{
double ratio1 = 0, ratio2 = 0, ratio3 = 0;
ratio1 = (b.X() - a.X()) / (c.X() - a.X());
ratio2 = (b.Y() - a.Y()) / (c.Y() - a.Y());
ratio3 = (b.Z() - a.Z()) / (c.Z() - a.Z());
if ((ratio1 == ratio2) && (ratio3 == ratio2))
return true;
return false;
}
pt_orient Facet::eval_point(Pt &p)
{
double a = 0, b = 0, c = 0, d = 0;
double distance = 0;
Pt A, B, C;
A = *boundary_edge->getorigin();
B = *boundary_edge->getnext()->getorigin();
C = *boundary_edge->getprev()->getorigin();
a = ((B.Y() - A.Y()) * (C.Z() - A.Z())) -
((C.Y() - A.Y()) * (B.Z() - A.Z()));
b = ((B.Z() - A.Z()) * (C.X() - A.X())) -
((C.Z() - A.Z()) * (B.X() - A.X()));
c = ((B.X() - A.X()) * (C.Y() - A.Y())) -
((C.X() - A.X()) * (B.Y() - A.Y()));
d = -(a * A.X() + b * A.Y() + c * A.Z());
distance = (a* p.X() + b * p.Y() + c * p.Z() + d) /
(sqrt(a*a + b*b + c*c));
if (distance > (0 - 0.0001) && distance < (0 + 0.0001))
{
return E_EQUAL;
}
else if (distance < 0)
{
return E_BELOW;
}
else
return E_ABOVE;
}
PT_ORIENT_T check_coplanar(Pt &p1, Pt &p2, Pt &p3, Pt &check)
{
double a = 0, b = 0, c = 0, d = 0;
double distance = 0;
Pt A, B, C;
A = p1;
B = p2;
C = p3;
a = ((B.Y() - A.Y()) * (C.Z() - A.Z())) -
((C.Y() - A.Y()) * (B.Z() - A.Z()));
b = ((B.Z() - A.Z()) * (C.X() - A.X())) -
((C.Z() - A.Z()) * (B.X() - A.X()));
c = ((B.X() - A.X()) * (C.Y() - A.Y())) -
((C.X() - A.X()) * (B.Y() - A.Y()));
d = -(a * A.X() + b * A.Y() + c * A.Z());
distance = (a* check.X() + b * check.Y() + c * check.Z() + d) /
(sqrt(a*a + b*b + c*c));
if ((distance > 0 - 0.0001) && (distance < 0 + 0.0001))
{
return E_EQUAL;
}
else if (distance < 0)
{
return E_BELOW;
}
else
return E_ABOVE;
}