Nektar::LibUtilities::CADCurve Class Reference

class for CAD curves. More...

#include <CADCurve.h>

Collaboration diagram for Nektar::LibUtilities::CADCurve:

Public Member Functions
	CADCurve (int i, TopoDS_Shape in)
	Default constructor. More...
Array< OneD, NekDouble >	Bounds ()
	Returns the minimum and maximum parametric coords t of the curve. More...
NekDouble	Length (NekDouble ti, NekDouble tf)
	Calculates the arclength between the two paremetric points ti and tf. ti must be less than tf. More...
Array< OneD, NekDouble >	P (NekDouble t)
	Gets the location (x,y,z) in an array out of the curve at point t. More...
NekDouble	tAtArcLength (NekDouble s)
	Calculates the parametric coordinate and arclength location defined by s. More...
Array< OneD, NekDouble >	GetMinMax ()
	Gets OpenCascade point objects for the start and end of the curve. More...
int	GetID ()
void	SetAdjSurf (std::vector< int > i)
std::vector< int >	GetAdjSurf ()

Private Attributes
int	m_ID
	ID of the curve. More...
BRepAdaptor_Curve	m_occCurve
	OpenCascade object of the curve. More...
std::vector< int >	m_adjSurfs
	List of surfaces which this curve belongs to. More...

Friends
class	MemoryManager< CADCurve >

Detailed Description

class for CAD curves.

This class wraps the OpenCascade BRepAdaptor_Curve class for use with Nektar++.

Definition at line 56 of file CADCurve.h.

Constructor & Destructor Documentation

Nektar::LibUtilities::CADCurve::CADCurve	(	int	i,
		TopoDS_Shape	in
	)

Default constructor.

Definition at line 46 of file CADCurve.cpp.

References m_occCurve.

                                         : m_ID(i)
{
    gp_Trsf transform;
    gp_Pnt ori(0.0, 0.0, 0.0);
    transform.SetScale(ori, 1.0 / 1000.0);
    TopLoc_Location mv(transform);
    in.Move(mv);
    m_occCurve = BRepAdaptor_Curve(TopoDS::Edge(in));
}

Member Function Documentation

Array< OneD, NekDouble > Nektar::LibUtilities::CADCurve::Bounds

(

)

Returns the minimum and maximum parametric coords t of the curve.

Returns

Array of two entries, min and max parametric coordinate.

Definition at line 142 of file CADCurve.cpp.

References m_occCurve.

{
    Array<OneD, NekDouble> t(2);
    t[0] = m_occCurve.FirstParameter();
    t[1] = m_occCurve.LastParameter();

    return t;
}

std::vector<int> Nektar::LibUtilities::CADCurve::GetAdjSurf ( )

inline

Definition at line 78 of file CADCurve.h.

References m_adjSurfs.

        {
            return m_adjSurfs;
        }

int Nektar::LibUtilities::CADCurve::GetID ( )

inline

Definition at line 68 of file CADCurve.h.

References m_ID.

        {
            return m_ID;
        }

Array< OneD, NekDouble > Nektar::LibUtilities::CADCurve::GetMinMax

(

)

Gets OpenCascade point objects for the start and end of the curve.

Returns

Array with 6 entries of endpoints x1,y1,z1,x2,y2,z2.

Definition at line 157 of file CADCurve.cpp.

References m_occCurve.

{
    Array<OneD, NekDouble> locs(6);

    gp_Pnt start = m_occCurve.Value(m_occCurve.FirstParameter());
    gp_Pnt end   = m_occCurve.Value(m_occCurve.LastParameter());

    locs[0] = start.X();
    locs[1] = start.Y();
    locs[2] = start.Z();
    locs[3] = end.X();
    locs[4] = end.Y();
    locs[5] = end.Z();

    return locs;
}

NekDouble Nektar::LibUtilities::CADCurve::Length	(	NekDouble	ti,
		NekDouble	tf
	)

Calculates the arclength between the two paremetric points ti and tf. ti must be less than tf.

Parameters

ti	First parametric coordinate.
tf	Second parametric coordinate.

Returns

Arc length between ti and tf.

Definition at line 96 of file CADCurve.cpp.

References m_occCurve.

{
    NekDouble len = 0;
    NekDouble dt = (m_occCurve.LastParameter() -
                    m_occCurve.FirstParameter()) / (1000 - 1);
    NekDouble t = ti;

    while(t + dt <= tf)
    {
        gp_Pnt P1,P2;
        gp_Vec drdt1,drdt2;

        m_occCurve.D1(t,P1,drdt1);
        t += dt;
        m_occCurve.D1(t,P2,drdt2);

        len += (drdt1.Magnitude() + drdt2.Magnitude()) / 2.0 * dt;
    }

    return len;
}

Array< OneD, NekDouble > Nektar::LibUtilities::CADCurve::P

(

NekDouble

t

)

Gets the location (x,y,z) in an array out of the curve at point t.

Parameters

t	Parametric coordinate

Returns

Array of x,y,z

Definition at line 124 of file CADCurve.cpp.

References m_occCurve.

{
    Array<OneD, NekDouble> location(3);
    gp_Pnt loc = m_occCurve.Value(t);

    location[0] = loc.X();
    location[1] = loc.Y();
    location[2] = loc.Z();

    return location;
}

void Nektar::LibUtilities::CADCurve::SetAdjSurf ( std::vector< int >  i )

inline

Definition at line 73 of file CADCurve.h.

References m_adjSurfs.

        {
            m_adjSurfs = i;
        }

NekDouble Nektar::LibUtilities::CADCurve::tAtArcLength

(

NekDouble

s

)

Calculates the parametric coordinate and arclength location defined by s.

Parameters

s	Arclength location.

Returns

Calculated parametric coordinate.

Todo:

This really needs improving for accuracy.

Definition at line 65 of file CADCurve.cpp.

References m_occCurve.

{
    NekDouble dt = (m_occCurve.LastParameter() -
                    m_occCurve.FirstParameter()) / (5000);
    NekDouble t = m_occCurve.FirstParameter();

    NekDouble len = 0.0;

    while(len <= s)
    {
        gp_Pnt P1,P2;
        gp_Vec drdt1,drdt2;

        m_occCurve.D1(t,P1,drdt1);
        t += dt;
        m_occCurve.D1(t,P2,drdt2);

        len += (drdt1.Magnitude() + drdt2.Magnitude()) / 2.0 * dt;
    }

    return t - dt;
}

Friends And Related Function Documentation

friend class MemoryManager< CADCurve >

friend

Definition at line 59 of file CADCurve.h.

Member Data Documentation

std::vector<int> Nektar::LibUtilities::CADCurve::m_adjSurfs

private

List of surfaces which this curve belongs to.

Definition at line 89 of file CADCurve.h.

Referenced by GetAdjSurf(), and SetAdjSurf().

int Nektar::LibUtilities::CADCurve::m_ID

private

ID of the curve.

Definition at line 85 of file CADCurve.h.

Referenced by GetID().

BRepAdaptor_Curve Nektar::LibUtilities::CADCurve::m_occCurve

private

OpenCascade object of the curve.

Definition at line 87 of file CADCurve.h.

Referenced by Bounds(), CADCurve(), GetMinMax(), Length(), P(), and tAtArcLength().