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+ fixes #0001912: Drawing Workbench Not Displaying Views of Cylindrical Parts.

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This commit is contained in:
wmayer 2015-01-12 01:43:48 +01:00
parent e16305cb83
commit b437dfd9da
1 changed files with 23 additions and 15 deletions
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38
src/Mod/Drawing/App/DrawingExport.cpp
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@ -74,6 +74,7 @@
#include <GeomConvert_BSplineCurveKnotSplitting.hxx>
#include <Geom2d_BSplineCurve.hxx>
#include <BRepLProp_CLProps.hxx>
#include <Standard_Failure.hxx>
#include "DrawingExport.h"
#include <Base/Tools.h>
@ -86,24 +87,31 @@ TopoDS_Edge DrawingOutput::asCircle(const BRepAdaptor_Curve& c) const
double curv=0;
gp_Pnt pnt, center;
// approximate the circle center from three positions
BRepLProp_CLProps prop(c,c.FirstParameter(),2,Precision::Confusion());
curv += prop.Curvature();
prop.CentreOfCurvature(pnt);
center.ChangeCoord().Add(pnt.Coord());
try {
// approximate the circle center from three positions
BRepLProp_CLProps prop(c,c.FirstParameter(),2,Precision::Confusion());
curv += prop.Curvature();
prop.CentreOfCurvature(pnt);
center.ChangeCoord().Add(pnt.Coord());
prop.SetParameter(0.5*(c.FirstParameter()+c.LastParameter()));
curv += prop.Curvature();
prop.CentreOfCurvature(pnt);
center.ChangeCoord().Add(pnt.Coord());
prop.SetParameter(0.5*(c.FirstParameter()+c.LastParameter()));
curv += prop.Curvature();
prop.CentreOfCurvature(pnt);
center.ChangeCoord().Add(pnt.Coord());
prop.SetParameter(c.LastParameter());
curv += prop.Curvature();
prop.CentreOfCurvature(pnt);
center.ChangeCoord().Add(pnt.Coord());
prop.SetParameter(c.LastParameter());
curv += prop.Curvature();
prop.CentreOfCurvature(pnt);
center.ChangeCoord().Add(pnt.Coord());
center.ChangeCoord().Divide(3);
curv /= 3;
center.ChangeCoord().Divide(3);
curv /= 3;
}
catch (Standard_Failure) {
// if getting center of curvature fails, e.g.
// for straight lines it raises LProp_NotDefined
return TopoDS_Edge();
}
// get circle from curvature information
double radius = 1 / curv;