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Upgrade test for BSpline is Line

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This commit is contained in:
wandererfan
2018-10-19 13:26:54 -04:00
committed by Yorik van Havre
parent 3ca8eb0989
commit 9f2ad88ded
2 changed files with 22 additions and 11 deletions
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30
src/Mod/TechDraw/App/Geometry.cpp
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@@ -564,31 +564,39 @@ BSpline::BSpline(const TopoDS_Edge &e)
//! Can this BSpline be represented by a straight line?
// if len(first-last) == sum(len(pi - pi+1)) then it is a line
bool BSpline::isLine()
{
bool result = false;
BRepAdaptor_Curve c(occEdge);
Handle(Geom_BSplineCurve) spline = c.BSpline();
if (spline->Degree() == 1) {
//TODO: this test is a bit sketchy
// proper test would be to test each pole for collinearity.
double splineLength = GCPnts_AbscissaPoint::Length (c);
double f = c.FirstParameter();
double l = c.LastParameter();
gp_Pnt s = c.Value(f);
gp_Pnt e = c.Value(l);
bool samePnt = s.IsEqual(e,FLT_EPSILON);
if (!samePnt) {
Base::Vector3d startPnt(s.X(), s.Y(), 0.0);
Base::Vector3d endPnt(e.X(), e.Y(), 0.0);
double endLength = (startPnt - endPnt).Length();
if (DrawUtil::fpCompare(splineLength,endLength)) {
Base::Vector3d vs = DrawUtil::gpPnt2V3(s);
Base::Vector3d ve = DrawUtil::gpPnt2V3(e);
double endLength = (vs - ve).Length();
int low = 0;
int high = spline->NbPoles() - 1;
TColgp_Array1OfPnt poles(low,high);
spline->Poles(poles);
double lenTotal = 0.0;
for (int i = 0; i < high; i++) {
gp_Pnt p1 = poles(i);
Base::Vector3d v1 = DrawUtil::gpPnt2V3(p1);
gp_Pnt p2 = poles(i+1);
Base::Vector3d v2 = DrawUtil::gpPnt2V3(p2);
lenTotal += (v2-v1).Length();
}
if (DrawUtil::fpCompare(lenTotal,endLength)) {
result = true;
}
}
}
return result;
}