internal virtual IntPtr NonConstPointer()
{
if (IntPtr.Zero == m_ptr && m_subobject_index >= 0 && m__parent != null)
{
Rhino.Geometry.PolyCurve pc = m__parent as Rhino.Geometry.PolyCurve;
if (pc != null)
{
IntPtr pPolyCurve = pc.NonConstPointer();
IntPtr pThis = UnsafeNativeMethods.ON_PolyCurve_SegmentCurve(pPolyCurve, m_subobject_index);
return(pThis);
}
Rhino.Geometry.BrepLoop loop = this as Rhino.Geometry.BrepLoop;
if (loop != null)
{
IntPtr pBrep = loop.Brep.NonConstPointer();
return(UnsafeNativeMethods.ON_BrepLoop_GetPointer(pBrep, loop.LoopIndex));
}
}
NonConstOperation(); // allows cached data to clean up
return(m_ptr);
}
internal virtual IntPtr NonConstPointer()
{
if (IntPtr.Zero != m_ptr)
{
// m_ptr points ot an ON_Object.
// Repair corruption that causes crashes in breps and meshes.
// The parameters 0,0 mean:
// The first 0 paramter = bReplair and means detect but do not repair - so exception handler can see the damaged original information.
// The second 0 parameter = bSilentError means call C++ ON_ERROR() so a dev running a debug build gets a chance to see
// the corrupt brep/mesh immediately.
if (PerformCorruptionTesting && 0 != UnsafeNativeMethods.ON_Object_IsCorrupt(m_ptr, 0, 0))
{
throw new CorruptGeometryException(m_ptr, this);
}
}
else if (m_subobject_index >= 0 && m__parent != null)
{
Rhino.Geometry.PolyCurve pc = m__parent as Rhino.Geometry.PolyCurve;
if (pc != null)
{
IntPtr ptr_polycurve = pc.NonConstPointer();
IntPtr ptr_this = UnsafeNativeMethods.ON_PolyCurve_SegmentCurve(ptr_polycurve, m_subobject_index);
return(ptr_this);
}
Rhino.Geometry.BrepLoop loop = this as Rhino.Geometry.BrepLoop;
if (loop != null)
{
IntPtr ptr_brep = loop.Brep.NonConstPointer();
return(UnsafeNativeMethods.ON_BrepLoop_GetPointer(ptr_brep, loop.LoopIndex));
}
}
NonConstOperation(); // allows cached data to clean up
return(m_ptr);
}
/// <summary>
/// Splits <paramref name="curve"/> as a <see cref="Rhino.Geometry.PolyCurve"/> where knot multiplicity is > degree - 2.
/// </summary>
/// <remarks>
/// Collapses knots using <paramref name="knotTolerance"/>.
/// </remarks>
/// <param name="curve"></param>
/// <param name="polyCurve"></param>
/// <param name="knotTolerance"></param>
/// <returns>false if no new polycurve is created.</returns>
public static bool TryGetPolyCurveC2(this Rhino.Geometry.NurbsCurve curve, out Rhino.Geometry.PolyCurve polyCurve, double knotTolerance = KnotTolerance)
{
bool duplicate = false;
var spans = default(List <double>);
var degree = curve.Degree;
var knots = curve.Knots;
for (int k = degree; k < knots.Count - degree;)
{
var multiplicity = KnotMultiplicity(knots, k, knotTolerance, out var _, out var strict);
if (multiplicity > degree - 2)
{
if (spans is null)
{
spans = new List <double>();
}
spans.Add(knots[k]);
}
if (!strict)
{
// We are going to modify curve so we need a duplicate here
if (!duplicate)
{
curve = curve.Duplicate() as Rhino.Geometry.NurbsCurve;
duplicate = true;
}
var excess = multiplicity - knots.KnotMultiplicity(k);
// Correct multiplicity in case more than degree knots are snapped here
multiplicity = Math.Min(multiplicity, degree);
// Insert new knot multiplicity
knots.InsertKnot(knots[k], multiplicity);
// Remove old knots that do not overlap knots[k]
if (excess > 0)
{
knots.RemoveKnots(k + multiplicity, k + multiplicity + excess);
}
}
k += multiplicity;
}
if (spans is null)
{
polyCurve = default;
return(false);
}
polyCurve = new Rhino.Geometry.PolyCurve();
foreach (var span in curve.Split(spans))
{
polyCurve.AppendSegment(span);
}
// Split may generate PolyCurves on seams.
if (curve.IsClosed)
{
polyCurve.RemoveNesting();
}
return(true);
}