Open CASCADE Technology 6.6.0
Public Member Functions | Protected Member Functions | Protected Attributes
FairCurve_Batten Class Reference

Constructs curves with a constant or linearly increasing
section to be used in the design of wooden or plastic
battens. These curves are two-dimensional, and
simulate physical splines or battens.

#include <FairCurve_Batten.hxx>

Inheritance diagram for FairCurve_Batten:
Inheritance graph
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Public Member Functions

 FairCurve_Batten (const gp_Pnt2d &P1, const gp_Pnt2d &P2, const Standard_Real Height, const Standard_Real Slope=0)
 Constructor with the two points and the geometrical
characteristics of the batten (elastic beam)
Height is the height of the deformation, and Slope is the
slope value, initialized at 0. The user can then supply the
desired slope value by the method, SetSlope.
Other parameters are initialized as follow :

virtual void Delete ()
virtual ~FairCurve_Batten ()
void SetFreeSliding (const Standard_Boolean FreeSliding)
 Freesliding is initialized with the default setting false.
When Freesliding is set to true and, as a result, sliding
is free, the sliding factor is automatically computed to
satisfy the equilibrium of the batten.


void SetConstraintOrder1 (const Standard_Integer ConstraintOrder)
 Allows you to change the order of the constraint on the
first point. ConstraintOrder has the default setting of 1.
The following settings are available:

void SetConstraintOrder2 (const Standard_Integer ConstraintOrder)
 Allows you to change the order of the constraint on the
second point. ConstraintOrder is initialized with the default setting of 1.
The following settings are available:

void SetP1 (const gp_Pnt2d &P1)
 Allows you to change the location of the point, P1, and in
doing so, modify the curve.
Warning
This method changes the angle as well as the point.
Exceptions
NullValue if the distance between P1 and P2 is less
than or equal to the tolerance value for distance in
Precision::Confusion: P1.IsEqual(P2,
Precision::Confusion()). The function
gp_Pnt2d::IsEqual tests to see if this is the case.

void SetP2 (const gp_Pnt2d &P2)
 Allows you to change the location of the point, P1, and in
doing so, modify the curve.
Warning
This method changes the angle as well as the point.
Exceptions
NullValue if the distance between P1 and P2 is less
than or equal to the tolerance value for distance in
Precision::Confusion: P1.IsEqual(P2,
Precision::Confusion()). The function
gp_Pnt2d::IsEqual tests to see if this is the case.

void SetAngle1 (const Standard_Real Angle1)
 Allows you to change the angle Angle1 at the first point,
P1. The default setting is 0.


void SetAngle2 (const Standard_Real Angle2)
 Allows you to change the angle Angle2 at the second
point, P2. The default setting is 0.


void SetHeight (const Standard_Real Height)
 Allows you to change the height of the deformation.
Raises NegativeValue; -- if Height <= 0
if Height <= 0

void SetSlope (const Standard_Real Slope)
 Allows you to set the slope value, Slope.

void SetSlidingFactor (const Standard_Real SlidingFactor)
 Allows you to change the ratio SlidingFactor. This
compares the length of the batten and the reference
length, which is, in turn, a function of the constraints.
This modification has one of the following two effects:

virtual Standard_Boolean Compute (FairCurve_AnalysisCode &Code, const Standard_Integer NbIterations=50, const Standard_Real Tolerance=1.0e-3)
 Performs the algorithm, using the arguments Code,
NbIterations and Tolerance and computes the curve
with respect to the constraints.
Code will have one of the following values:

Standard_Real SlidingOfReference () const
 Computes the real number value for length Sliding of
Reference for new constraints. If you want to give a
specific length to a batten curve, use the following
syntax: b.SetSlidingFactor(L /
b.SlidingOfReference()) where b is the
name of the batten curve object.

Standard_Boolean GetFreeSliding () const
 Returns the initial free sliding value, false by default.
Free sliding is generally more aesthetically pleasing
than constrained sliding. However, the computation can
fail with values such as angles greater than PI/2. This is
because the resulting batten length is theoretically infinite.

Standard_Integer GetConstraintOrder1 () const
 Returns the established first constraint order.

Standard_Integer GetConstraintOrder2 () const
 Returns the established second constraint order.

const gp_Pnt2dGetP1 () const
 Returns the established location of the point P1.

const gp_Pnt2dGetP2 () const
 Returns the established location of the point P2.

Standard_Real GetAngle1 () const
 Returns the established first angle.

Standard_Real GetAngle2 () const
 Returns the established second angle.

Standard_Real GetHeight () const
 Returns the thickness of the lathe.

Standard_Real GetSlope () const
 Returns the established slope value.

Standard_Real GetSlidingFactor () const
 Returns the initial sliding factor.

Handle_Geom2d_BSplineCurve Curve () const
 Returns the computed curve a 2d BSpline.

virtual void Dump (Standard_OStream &o) const
 Prints on the stream o information on the current state
of the object.

Private methodes --------------------------------------


Protected Member Functions

Standard_Real SlidingOfReference (const Standard_Real D, const Standard_Real A1, const Standard_Real A2) const
Standard_Real Compute (const Standard_Real D, const Standard_Real A1, const Standard_Real A2) const
Standard_Real Compute (const Standard_Real D, const Standard_Real A) const
 Returns the effective geometrical constraints at the
last batten computation. This effectives values may
be not equal with the wanted values if

Protected Attributes

FairCurve_AnalysisCode myCode
gp_Pnt2d OldP1
gp_Pnt2d OldP2
Standard_Real OldAngle1
Standard_Real OldAngle2
Standard_Real OldHeight
Standard_Real OldSlope
Standard_Real OldSlidingFactor
Standard_Boolean OldFreeSliding
Standard_Integer OldConstraintOrder1
Standard_Integer OldConstraintOrder2
gp_Pnt2d NewP1
gp_Pnt2d NewP2
Standard_Real NewAngle1
Standard_Real NewAngle2
Standard_Real NewHeight
Standard_Real NewSlope
Standard_Real NewSlidingFactor
Standard_Boolean NewFreeSliding
Standard_Integer NewConstraintOrder1
Standard_Integer NewConstraintOrder2
Standard_Integer Degree
Handle_TColgp_HArray1OfPnt2d Poles
Handle_TColStd_HArray1OfReal Flatknots
Handle_TColStd_HArray1OfReal Knots
Handle_TColStd_HArray1OfInteger Mults

Constructor & Destructor Documentation

FairCurve_Batten::FairCurve_Batten ( const gp_Pnt2d P1,
const gp_Pnt2d P2,
const Standard_Real  Height,
const Standard_Real  Slope = 0 
)
  • FreeSliding = False
  • ConstraintOrder1 = 1
  • ConstraintOrder2 = 1
  • Angle1 = 0
  • Angle2 = 0
  • SlidingFactor = 1
    Exceptions
    NegativeValue if Height is less than or equal to 0.
    NullValue if the distance between P1 and P2 is less
    than or equal to the tolerance value for distance in
    Precision::Confusion: P1.IsEqual(P2,
    Precision::Confusion()). The function
    gp_Pnt2d::IsEqual tests to see if this is the case.
virtual FairCurve_Batten::~FairCurve_Batten ( ) [inline, virtual]

Member Function Documentation

virtual Standard_Boolean FairCurve_Batten::Compute ( FairCurve_AnalysisCode Code,
const Standard_Integer  NbIterations = 50,
const Standard_Real  Tolerance = 1.0e-3 
) [virtual]
  • OK
  • NotConverged
  • InfiniteSliding
  • NullHeight
    The parameters Tolerance and NbIterations control
    how precise the computation is, and how long it will take.

Reimplemented in FairCurve_MinimalVariation.

Standard_Real FairCurve_Batten::Compute ( const Standard_Real  D,
const Standard_Real  A1,
const Standard_Real  A2 
) const [protected]
Standard_Real FairCurve_Batten::Compute ( const Standard_Real  D,
const Standard_Real  A 
) const [protected]
  • if the value is "free"
  • in the case of incomplete computation : collapse,
    infinite sliding, height of batten will be negative at end points
Handle_Geom2d_BSplineCurve FairCurve_Batten::Curve ( ) const
virtual void FairCurve_Batten::Delete ( ) [virtual]
virtual void FairCurve_Batten::Dump ( Standard_OStream o) const [virtual]

Reimplemented in FairCurve_MinimalVariation.

Standard_Real FairCurve_Batten::GetAngle1 ( ) const
Standard_Real FairCurve_Batten::GetAngle2 ( ) const
Standard_Integer FairCurve_Batten::GetConstraintOrder1 ( ) const
Standard_Integer FairCurve_Batten::GetConstraintOrder2 ( ) const
Standard_Boolean FairCurve_Batten::GetFreeSliding ( ) const
Standard_Real FairCurve_Batten::GetHeight ( ) const
const gp_Pnt2d& FairCurve_Batten::GetP1 ( ) const
const gp_Pnt2d& FairCurve_Batten::GetP2 ( ) const
Standard_Real FairCurve_Batten::GetSlidingFactor ( ) const
Standard_Real FairCurve_Batten::GetSlope ( ) const
void FairCurve_Batten::SetAngle1 ( const Standard_Real  Angle1)
void FairCurve_Batten::SetAngle2 ( const Standard_Real  Angle2)
void FairCurve_Batten::SetConstraintOrder1 ( const Standard_Integer  ConstraintOrder)
  • 0-the curve must pass through a point
  • 1-the curve must pass through a point and have a given tangent
  • 2-the curve must pass through a point, have a given tangent and a given curvature.
    The third setting is only valid for
    FairCurve_MinimalVariation curves.
    These constraints, though geometric, represent the
    mechanical constraints due, for example, to the
    resistance of the material the actual physical batten is made of.
void FairCurve_Batten::SetConstraintOrder2 ( const Standard_Integer  ConstraintOrder)
  • 0-the curve must pass through a point
  • 1-the curve must pass through a point and have a given tangent
  • 2-the curve must pass through a point, have a given
    tangent and a given curvature.
    The third setting is only valid for
    FairCurve_MinimalVariation curves.
    These constraints, though geometric, represent the
    mechanical constraints due, for example, to the
    resistance of the material the actual physical batten is made of.
void FairCurve_Batten::SetFreeSliding ( const Standard_Boolean  FreeSliding)
void FairCurve_Batten::SetHeight ( const Standard_Real  Height)
void FairCurve_Batten::SetP1 ( const gp_Pnt2d P1)
void FairCurve_Batten::SetP2 ( const gp_Pnt2d P2)
void FairCurve_Batten::SetSlidingFactor ( const Standard_Real  SlidingFactor)
  • if you increase the value, it inflates the batten
  • if you decrease the value, it flattens the batten.
    When sliding is free, the sliding factor is automatically
    computed to satisfy the equilibrium of the batten. When
    sliding is imposed, a value is required for the sliding factor.
    SlidingFactor is initialized with the default setting of 1.
void FairCurve_Batten::SetSlope ( const Standard_Real  Slope)
Standard_Real FairCurve_Batten::SlidingOfReference ( ) const
Standard_Real FairCurve_Batten::SlidingOfReference ( const Standard_Real  D,
const Standard_Real  A1,
const Standard_Real  A2 
) const [protected]

Field Documentation

Handle_TColStd_HArray1OfReal FairCurve_Batten::Flatknots [protected]
Handle_TColStd_HArray1OfReal FairCurve_Batten::Knots [protected]
Handle_TColStd_HArray1OfInteger FairCurve_Batten::Mults [protected]
Handle_TColgp_HArray1OfPnt2d FairCurve_Batten::Poles [protected]

The documentation for this class was generated from the following file:
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