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#include <math.hxx>
#include <math_Vector.hxx>
#include <gp.hxx>
#include <gp_Vec.hxx>
#include <Standard_NotImplemented.hxx>
#include <TColStd_Array1OfReal.hxx>
GProp_CGProps::GProp_CGProps(){}
void GProp_CGProps::SetLocation(const gp_Pnt& CLocation)
{
loc = CLocation;
}
void GProp_CGProps::Perform (const Curve& C)
{
Standard_Real Ix, Iy, Iz, Ixx, Iyy, Izz, Ixy, Ixz, Iyz;
dim = Ix = Iy = Iz = Ixx = Iyy = Izz = Ixy = Ixz = Iyz = 0.0;
Standard_Real Lower = Tool::FirstParameter (C);
Standard_Real Upper = Tool::LastParameter (C);
Standard_Integer Order = Min(Tool::IntegrationOrder (C),
math::GaussPointsMax());
gp_Pnt P; //value on the curve
gp_Vec V1; //first derivative on the curve
Standard_Real ds; //curvilign abscissae
Standard_Real ur, um, u;
Standard_Real x, y, z;
Standard_Real xloc, yloc, zloc;
math_Vector GaussP (1, Order);
math_Vector GaussW (1, Order);
//Recuperation des points de Gauss dans le fichier GaussPoints.
math::GaussPoints (Order,GaussP);
math::GaussWeights (Order,GaussW);
// modified by NIZHNY-MKK Thu Jun 9 12:13:21 2005.BEGIN
Standard_Integer nbIntervals = Tool::NbIntervals(C, GeomAbs_CN);
Standard_Boolean bHasIntervals = (nbIntervals > 1);
TColStd_Array1OfReal TI(1, nbIntervals + 1);
if(bHasIntervals) {
Tool::Intervals(C, TI, GeomAbs_CN);
}
else {
nbIntervals = 1;
}
Standard_Integer nIndex = 0;
Standard_Real UU1 = Min(Lower, Upper);
Standard_Real UU2 = Max(Lower, Upper);
for(nIndex = 1; nIndex <= nbIntervals; nIndex++) {
if(bHasIntervals) {
Lower = Max(TI(nIndex), UU1);
Upper = Min(TI(nIndex+1), UU2);
}
else {
Lower = UU1;
Upper = UU2;
}
Standard_Real dimLocal, IxLocal, IyLocal, IzLocal, IxxLocal, IyyLocal, IzzLocal, IxyLocal, IxzLocal, IyzLocal;
dimLocal = IxLocal = IyLocal = IzLocal = IxxLocal = IyyLocal = IzzLocal = IxyLocal = IxzLocal = IyzLocal = 0.0;
// modified by NIZHNY-MKK Thu Jun 9 12:13:32 2005.END
loc.Coord (xloc, yloc, zloc);
Standard_Integer i;
// Calcul des integrales aux points de gauss :
um = 0.5 * (Upper + Lower);
ur = 0.5 * (Upper - Lower);
for (i = 1; i <= Order; i++) {
u = um + ur * GaussP (i);
Tool::D1 (C,u, P, V1);
ds = V1.Magnitude();
P.Coord (x, y, z);
x -= xloc;
y -= yloc;
z -= zloc;
ds *= GaussW (i);
dimLocal += ds;
IxLocal += x * ds;
IyLocal += y * ds;
IzLocal += z * ds;
IxyLocal += x * y * ds;
IyzLocal += y * z * ds;
IxzLocal += x * z * ds;
x *= x;
y *= y;
z *= z;
IxxLocal += (y + z) * ds;
IyyLocal += (x + z) * ds;
IzzLocal += (x + y) * ds;
}
// modified by NIZHNY-MKK Thu Jun 9 12:13:47 2005.BEGIN
dimLocal *= ur;
IxLocal *= ur;
IyLocal *= ur;
IzLocal *= ur;
IxxLocal *= ur;
IyyLocal *= ur;
IzzLocal *= ur;
IxyLocal *= ur;
IxzLocal *= ur;
IyzLocal *= ur;
dim += dimLocal;
Ix += IxLocal;
Iy += IyLocal;
Iz += IzLocal;
Ixx += IxxLocal;
Iyy += IyyLocal;
Izz += IzzLocal;
Ixy += IxyLocal;
Ixz += IxzLocal;
Iyz += IyzLocal;
}
// modified by NIZHNY-MKK Thu Jun 9 12:13:55 2005.END
inertia = gp_Mat (gp_XYZ (Ixx, -Ixy, -Ixz),
gp_XYZ (-Ixy, Iyy, -Iyz),
gp_XYZ (-Ixz, -Iyz, Izz));
if (Abs(dim) < gp::Resolution())
g = P;
else
g.SetCoord (Ix/dim, Iy/dim, Iz/dim);
}
GProp_CGProps::GProp_CGProps (const Curve& C,
const gp_Pnt& CLocation)
{
SetLocation(CLocation);
Perform(C);
}
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