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// File: BRepOffset.cxx
// Created: Wed Oct 25 10:39:23 1995
// Author: Bruno DUMORTIER
// <dub@fuegox>
#include <BRepOffset.ixx>
#include <Geom_Plane.hxx>
#include <Geom_CylindricalSurface.hxx>
#include <Geom_ConicalSurface.hxx>
#include <Geom_SphericalSurface.hxx>
#include <Geom_ToroidalSurface.hxx>
#include <Geom_SurfaceOfRevolution.hxx>
#include <Geom_SurfaceOfLinearExtrusion.hxx>
#include <Geom_BSplineSurface.hxx>
#include <Geom_RectangularTrimmedSurface.hxx>
#include <Geom_OffsetSurface.hxx>
#include <gp_Vec.hxx>
#include <gp_Dir.hxx>
#include <gp_Ax3.hxx>
#include <gp_Ax1.hxx>
#include <Precision.hxx>
//=======================================================================
//function : Surface
//purpose :
//=======================================================================
Handle(Geom_Surface) BRepOffset::Surface(const Handle(Geom_Surface)& Surface,
const Standard_Real Offset,
BRepOffset_Status& Status)
{
Standard_Real Tol = Precision::Confusion();
Status = BRepOffset_Good;
Handle(Geom_Surface) Result;
Handle(Standard_Type) TheType = Surface->DynamicType();
if (TheType == STANDARD_TYPE(Geom_Plane)) {
Handle(Geom_Plane) P =
Handle(Geom_Plane)::DownCast(Surface);
gp_Vec T = P->Position().XDirection()^P->Position().YDirection();
T *= Offset;
Result = Handle(Geom_Plane)::DownCast(P->Translated(T));
}
else if (TheType == STANDARD_TYPE(Geom_CylindricalSurface)) {
Handle(Geom_CylindricalSurface) C =
Handle(Geom_CylindricalSurface)::DownCast(Surface);
Standard_Real Radius = C->Radius();
gp_Ax3 Axis = C->Position();
if (Axis.Direct())
Radius += Offset;
else
Radius -= Offset;
if ( Radius >= Tol ) {
Result = new Geom_CylindricalSurface( Axis, Radius);
}
else if ( Radius <= -Tol ){
Axis.Rotate(gp_Ax1(Axis.Location(),Axis.Direction()),PI);
Result = new Geom_CylindricalSurface( Axis, Abs(Radius));
Status = BRepOffset_Reversed;
}
else {
Status = BRepOffset_Degenerated;
}
}
else if (TheType == STANDARD_TYPE(Geom_ConicalSurface)) {
Handle(Geom_ConicalSurface) C =
Handle(Geom_ConicalSurface)::DownCast(Surface);
Standard_Real Alpha = C->SemiAngle();
Standard_Real Radius = C->RefRadius() + Offset * Cos(Alpha);
gp_Ax3 Axis = C->Position();
if ( Radius >= 0.) {
gp_Vec Z( Axis.Direction());
Z *= - Offset * Sin(Alpha);
Axis.Translate(Z);
}
else {
Radius = -Radius;
gp_Vec Z( Axis.Direction());
Z *= - Offset * Sin(Alpha);
Axis.Translate(Z);
Axis.Rotate(gp_Ax1(Axis.Location(),Axis.Direction()),PI);
Alpha = -Alpha;
}
Result = new Geom_ConicalSurface(Axis, Alpha, Radius);
}
else if (TheType == STANDARD_TYPE(Geom_SphericalSurface)) {
Handle(Geom_SphericalSurface) S =
Handle(Geom_SphericalSurface)::DownCast(Surface);
Standard_Real Radius = S->Radius();
gp_Ax3 Axis = S->Position();
if (Axis.Direct())
Radius += Offset;
else
Radius -= Offset;
if ( Radius >= Tol) {
Result = new Geom_SphericalSurface(Axis, Radius);
}
else if ( Radius <= -Tol ) {
Axis.Rotate(gp_Ax1(Axis.Location(),Axis.Direction()),PI);
Axis.ZReverse();
Result = new Geom_SphericalSurface(Axis, -Radius);
Status = BRepOffset_Reversed;
}
else {
Status = BRepOffset_Degenerated;
}
}
else if (TheType == STANDARD_TYPE(Geom_ToroidalSurface)) {
Handle(Geom_ToroidalSurface) S =
Handle(Geom_ToroidalSurface)::DownCast(Surface);
Standard_Real MajorRadius = S->MajorRadius();
Standard_Real MinorRadius = S->MinorRadius();
gp_Ax3 Axis = S->Position();
if (MinorRadius < MajorRadius) { // A FINIR
if (Axis.Direct())
MinorRadius += Offset;
else
MinorRadius -= Offset;
if (MinorRadius >= Tol) {
Result = new Geom_ToroidalSurface(Axis,MajorRadius,MinorRadius);
}
else if (MinorRadius <= -Tol) {
Status = BRepOffset_Reversed;
}
else {
Status = BRepOffset_Degenerated;
}
}
}
else if (TheType == STANDARD_TYPE(Geom_SurfaceOfRevolution)) {
}
else if (TheType == STANDARD_TYPE(Geom_SurfaceOfLinearExtrusion)) {
}
else if (TheType == STANDARD_TYPE(Geom_BSplineSurface)) {
}
else if (TheType == STANDARD_TYPE(Geom_RectangularTrimmedSurface)) {
Handle(Geom_RectangularTrimmedSurface) S =
Handle(Geom_RectangularTrimmedSurface)::DownCast(Surface);
Standard_Real U1,U2,V1,V2;
S->Bounds(U1,U2,V1,V2);
Handle(Geom_Surface) Off =
BRepOffset::Surface(S->BasisSurface(),Offset,Status);
Result = new Geom_RectangularTrimmedSurface (Off,U1,U2,V1,V2);
}
else if (TheType == STANDARD_TYPE(Geom_OffsetSurface)) {
}
if ( Result.IsNull()) {
Result = new Geom_OffsetSurface( Surface, Offset);
}
return Result;
}
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