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TopoShape: add a common function to build spirals and helixes

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This commit is contained in:
tomate44
2021-03-04 15:44:35 +01:00
committed by wmayer
parent fd6d471a24
commit 8a7a5b583f
2 changed files with 55 additions and 0 deletions
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53
src/Mod/Part/App/TopoShape.cpp
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@@ -2503,6 +2503,59 @@ TopoDS_Shape TopoShape::makeLongHelix(Standard_Real pitch, Standard_Real height,
return TopoDS_Shape(std::move(wire));
}
TopoDS_Shape TopoShape::makeSpiralHelix(Standard_Real radiusbottom, Standard_Real radiustop,
Standard_Real height, Standard_Real nbturns,
Standard_Real breakperiod) const
{
// 1000 periods is an OCCT limit. The 3D curve gets truncated
// if he 2D curve spans beyond this limit.
if ((breakperiod < 0) || (breakperiod > 1000))
Standard_Failure::Raise("Break period must be in [0, 1000]");
if (breakperiod == 0)
breakperiod = 1000;
if (nbturns <= 0)
Standard_Failure::Raise("Number of turns must be greater than 0");
Standard_Real nbFullTurns = floor(nbturns/breakperiod);
Standard_Real partTurn = nbturns - nbFullTurns*breakperiod;
// A Bezier curve is used below, to get a periodic surface also for spirals.
TColgp_Array1OfPnt poles(1,2);
poles(1) = gp_Pnt(fabs(radiusbottom), 0, 0);
poles(2) = gp_Pnt(fabs(radiustop), 0, height);
Handle(Geom_BezierCurve) meridian;
meridian = new Geom_BezierCurve(poles);
gp_Ax1 axis(gp_Pnt(0.0,0.0,0.0) , gp::DZ());
Handle(Geom_Surface) surf;
surf = new Geom_SurfaceOfRevolution(meridian, axis);
gp_Pnt2d beg(0, 0);
gp_Pnt2d end(0, 0);
gp_Vec2d dir(2.0 * M_PI, height / nbturns);
Handle(Geom2d_TrimmedCurve) segm;
TopoDS_Edge edgeOnSurf;
BRepBuilderAPI_MakeWire mkWire;
for (unsigned long i = 0; i < nbFullTurns; i++) {
end = beg.Translated(dir);
segm = GCE2d_MakeSegment(beg , end);
edgeOnSurf = BRepBuilderAPI_MakeEdge(segm , surf);
mkWire.Add(edgeOnSurf);
beg = end;
}
if (partTurn > Precision::Confusion()) {
dir.Scale(partTurn);
end = beg.Translated(dir);
segm = GCE2d_MakeSegment(beg , end);
edgeOnSurf = BRepBuilderAPI_MakeEdge(segm , surf);
mkWire.Add(edgeOnSurf);
}
TopoDS_Wire wire = mkWire.Wire();
BRepLib::BuildCurves3d(wire, Precision::Confusion(), GeomAbs_Shape::GeomAbs_C1, 14, 10000);
return TopoDS_Shape(std::move(wire));
}
TopoDS_Shape TopoShape::makeThread(Standard_Real pitch,
Standard_Real depth,
Standard_Real height,

2
src/Mod/Part/App/TopoShape.h
View File

@@ -258,6 +258,8 @@ public:
TopoDS_Shape makeLongHelix(Standard_Real pitch, Standard_Real height,
Standard_Real radius, Standard_Real angle=0,
Standard_Boolean left=Standard_False) const;
TopoDS_Shape makeSpiralHelix(Standard_Real radiusbottom, Standard_Real radiustop,
Standard_Real height, Standard_Real nbturns=1, Standard_Real breakperiod=1) const;
TopoDS_Shape makeThread(Standard_Real pitch, Standard_Real depth,
Standard_Real height, Standard_Real radius) const;
TopoDS_Shape makeLoft(const TopTools_ListOfShape& profiles, Standard_Boolean isSolid,