bool ON_HatchLoop::SetCurve( const ON_Curve& curve)
{
ON_Curve* pC = curve.DuplicateCurve();
if( pC)
{
if(pC->Dimension() == 3 && !pC->ChangeDimension(2))
return false;
if( m_p2dCurve)
delete m_p2dCurve;
m_p2dCurve = pC;
}
return true;
}
ON_Surface::ISO
ON_Surface::IsIsoparametric( const ON_Curve& curve, const ON_Interval* subdomain ) const
{
ISO iso = not_iso;
if ( subdomain )
{
ON_Interval cdom = curve.Domain();
double t0 = cdom.NormalizedParameterAt(subdomain->Min());
double t1 = cdom.NormalizedParameterAt(subdomain->Max());
if ( t0 < t1-ON_SQRT_EPSILON )
{
if ( (t0 > ON_SQRT_EPSILON && t0 < 1.0-ON_SQRT_EPSILON) || (t1 > ON_SQRT_EPSILON && t1 < 1.0-ON_SQRT_EPSILON) )
{
cdom.Intersection(*subdomain);
if ( cdom.IsIncreasing() )
{
ON_NurbsCurve nurbs_curve;
if ( curve.GetNurbForm( nurbs_curve, 0.0,&cdom) )
{
return IsIsoparametric( nurbs_curve, 0 );
}
}
}
}
}
ON_BoundingBox bbox;
double tolerance = 0.0;
const int dim = curve.Dimension();
if ( (dim == 2 || dim==3) && curve.GetBoundingBox(bbox) )
{
iso = IsIsoparametric( bbox );
switch (iso) {
case x_iso:
case W_iso:
case E_iso:
// make sure curve is a (nearly) vertical line
// and weed out vertical scribbles
tolerance = bbox.m_max.x - bbox.m_min.x;
if ( tolerance < ON_ZERO_TOLERANCE && ON_ZERO_TOLERANCE*1024.0 <= (bbox.m_max.y-bbox.m_min.y) )
{
// 26 March 2007 Dale Lear
// If tolerance is tiny, then use ON_ZERO_TOLERANCE
// This fixes cases where iso curves where not getting
// the correct flag because tol=1e-16 and the closest
// point to line had calculation errors of 1e-15.
tolerance = ON_ZERO_TOLERANCE;
}
if ( !curve.IsLinear( tolerance ) )
iso = not_iso;
break;
case y_iso:
case S_iso:
case N_iso:
// make sure curve is a (nearly) horizontal line
// and weed out horizontal scribbles
tolerance = bbox.m_max.y - bbox.m_min.y;
if ( tolerance < ON_ZERO_TOLERANCE && ON_ZERO_TOLERANCE*1024.0 <= (bbox.m_max.x-bbox.m_min.x) )
{
// 26 March 2007 Dale Lear
// If tolerance is tiny, then use ON_ZERO_TOLERANCE
// This fixes cases where iso curves where not getting
// the correct flag because tol=1e-16 and the closest
// point to line had calculation errors of 1e-15.
tolerance = ON_ZERO_TOLERANCE;
}
if ( !curve.IsLinear( tolerance ) )
iso = not_iso;
break;
default:
// nothing here
break;
}
}
return iso;
}
