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+ fixes #0001898: Drawing workbench draws cylinder in orthographic projection wrong

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This commit is contained in:
wmayer
2015-01-11 01:46:31 +01:00
parent 9cb8471fa2
commit 0a31bebaed
2 changed files with 86 additions and 3 deletions
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76
src/Mod/Drawing/App/DrawingExport.cpp
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@@ -25,6 +25,7 @@
#ifndef _PreComp_
# include <sstream>
# include <cmath>
# include <BRepAdaptor_Curve.hxx>
# include <Geom_Circle.hxx>
# include <gp_Circ.hxx>
@@ -33,6 +34,7 @@
#include <Bnd_Box.hxx>
#include <BRepBndLib.hxx>
#include <BRepBuilderAPI_MakeEdge.hxx>
#include <BRepBuilderAPI_Transform.hxx>
#include <HLRBRep_Algo.hxx>
#include <TopoDS_Shape.hxx>
@@ -71,6 +73,7 @@
#include <GeomConvert_BSplineCurveToBezierCurve.hxx>
#include <GeomConvert_BSplineCurveKnotSplitting.hxx>
#include <Geom2d_BSplineCurve.hxx>
#include <BRepLProp_CLProps.hxx>
#include "DrawingExport.h"
#include <Base/Tools.h>
@@ -78,6 +81,70 @@
using namespace Drawing;
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());
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());
center.ChangeCoord().Divide(3);
curv /= 3;
// get circle from curvature information
double radius = 1 / curv;
TopLoc_Location location;
Handle(Poly_Polygon3D) polygon = BRep_Tool::Polygon3D(c.Edge(), location);
if (!polygon.IsNull()) {
const TColgp_Array1OfPnt& nodes = polygon->Nodes();
for (int i = nodes.Lower(); i <= nodes.Upper(); i++) {
gp_Pnt p = nodes(i);
double dist = p.Distance(center);
if (std::abs(dist - radius) > 0.001)
return TopoDS_Edge();
}
gp_Circ circ;
circ.SetLocation(center);
circ.SetRadius(radius);
gp_Pnt p1 = nodes(nodes.Lower());
gp_Pnt p2 = nodes(nodes.Upper());
double dist = p1.Distance(p2);
if (dist < Precision::Confusion()) {
BRepBuilderAPI_MakeEdge mkEdge(circ);
return mkEdge.Edge();
}
else {
gp_Vec dir1(center, p1);
dir1.Normalize();
gp_Vec dir2(center, p2);
dir2.Normalize();
p1 = gp_Pnt(center.XYZ() + radius * dir1.XYZ());
p2 = gp_Pnt(center.XYZ() + radius * dir2.XYZ());
BRepBuilderAPI_MakeEdge mkEdge(circ, p1, p2);
return mkEdge.Edge();
}
}
return TopoDS_Edge();
}
SVGOutput::SVGOutput()
{
}
@@ -97,7 +164,14 @@ std::string SVGOutput::exportEdges(const TopoDS_Shape& input)
printEllipse(adapt, i, result);
}
else if (adapt.GetType() == GeomAbs_BSplineCurve) {
printBSpline(adapt, i, result);
TopoDS_Edge circle = asCircle(adapt);
if (circle.IsNull()) {
printBSpline(adapt, i, result);
}
else {
BRepAdaptor_Curve adapt_circle(circle);
printCircle(adapt_circle, result);
}
}
// fallback
else {