Open CASCADE Technology  7.1.0.beta

# Geom2dGcc_Lin2dTanObl Class Reference

This class implements the algorithms used to create 2d line tangent to a curve QualifiedCurv and doing an angle Angle with a line TheLin. The angle must be in Radian. Describes functions for building a 2D line making a given angle with a line and tangential to a curve. A Lin2dTanObl object provides a framework for: More...

`#include <Geom2dGcc_Lin2dTanObl.hxx>`

## Public Member Functions

Geom2dGcc_Lin2dTanObl (const Geom2dGcc_QualifiedCurve &Qualified1, const gp_Lin2d &TheLin, const Standard_Real TolAng, const Standard_Real Angle)
This class implements the algorithm used to create 2d line tangent to a curve and doing an angle Angle with the line TheLin. Angle must be in Radian. Tolang is the angular tolerance. More...

Geom2dGcc_Lin2dTanObl (const Geom2dGcc_QualifiedCurve &Qualified1, const gp_Lin2d &TheLin, const Standard_Real TolAng, const Standard_Real Param1, const Standard_Real Angle)
This class implements the algorithm used to create 2d line tangent to a curve and doing an angle Angle with the line TheLin. Angle must be in Radian. Param2 is the initial guess on the curve QualifiedCurv. Tolang is the angular tolerance. Warning An iterative algorithm is used if Qualified1 is more complex than a line or a circle. In such cases, the algorithm constructs only one solution. Exceptions GccEnt_BadQualifier if a qualifier is inconsistent with the argument it qualifies (for example, enclosed for a circle). More...

Standard_Boolean IsDone () const
Returns true if the construction algorithm does not fail (even if it finds no solution). Note: IsDone protects against a failure arising from a more internal intersection algorithm, which has reached its numeric limits. More...

Standard_Integer NbSolutions () const
Returns the number of lines, representing solutions computed by this algorithm. Exceptions StdFail_NotDone if the construction fails. More...

gp_Lin2d ThisSolution (const Standard_Integer Index) const
Returns a line, representing the solution of index Index computed by this algorithm. Exceptions Standard_OutOfRange if Index is less than zero or greater than the number of solutions computed by this algorithm. StdFail_NotDone if the construction fails. More...

void WhichQualifier (const Standard_Integer Index, GccEnt_Position &Qualif1) const
Returns the qualifier Qualif1 of the tangency argument for the solution of index Index computed by this algorithm. The returned qualifier is: More...

void Tangency1 (const Standard_Integer Index, Standard_Real &ParSol, Standard_Real &ParArg, gp_Pnt2d &PntSol) const
Returns informations about the tangency point between the result and the first argument. ParSol is the intrinsic parameter of the point PntSol on the solution curv. ParArg is the intrinsic parameter of the point PntSol on the argument curv. More...

void Intersection2 (const Standard_Integer Index, Standard_Real &ParSol, Standard_Real &ParArg, gp_Pnt2d &PntSol) const
Returns the point of intersection PntSol between the solution of index Index and the second argument (the line) of this algorithm. ParSol is the parameter of the point PntSol on the solution. ParArg is the parameter of the point PntSol on the second argument (the line). Exceptions StdFail_NotDone if the construction fails. Geom2dGcc_IsParallel if the solution and the second argument (the line) are parallel. Standard_OutOfRange if Index is less than zero or greater than the number of solutions computed by this algorithm. More...

Standard_Boolean IsParallel2 () const
Returns true if the line and the solution are parallel. This is the case when the angle given at the time of construction is equal to 0 or Pi. Exceptions StdFail_NotDone if the construction fails. More...

## Detailed Description

This class implements the algorithms used to create 2d line tangent to a curve QualifiedCurv and doing an angle Angle with a line TheLin. The angle must be in Radian. Describes functions for building a 2D line making a given angle with a line and tangential to a curve. A Lin2dTanObl object provides a framework for:

• defining the construction of 2D line(s),
• implementing the construction algorithm, and
• consulting the result(s).

## Constructor & Destructor Documentation

 Geom2dGcc_Lin2dTanObl::Geom2dGcc_Lin2dTanObl ( const Geom2dGcc_QualifiedCurve & Qualified1, const gp_Lin2d & TheLin, const Standard_Real TolAng, const Standard_Real Angle )

This class implements the algorithm used to create 2d line tangent to a curve and doing an angle Angle with the line TheLin. Angle must be in Radian. Tolang is the angular tolerance.

 Geom2dGcc_Lin2dTanObl::Geom2dGcc_Lin2dTanObl ( const Geom2dGcc_QualifiedCurve & Qualified1, const gp_Lin2d & TheLin, const Standard_Real TolAng, const Standard_Real Param1, const Standard_Real Angle )

This class implements the algorithm used to create 2d line tangent to a curve and doing an angle Angle with the line TheLin. Angle must be in Radian. Param2 is the initial guess on the curve QualifiedCurv. Tolang is the angular tolerance. Warning An iterative algorithm is used if Qualified1 is more complex than a line or a circle. In such cases, the algorithm constructs only one solution. Exceptions GccEnt_BadQualifier if a qualifier is inconsistent with the argument it qualifies (for example, enclosed for a circle).

## Member Function Documentation

 void Geom2dGcc_Lin2dTanObl::Intersection2 ( const Standard_Integer Index, Standard_Real & ParSol, Standard_Real & ParArg, gp_Pnt2d & PntSol ) const

Returns the point of intersection PntSol between the solution of index Index and the second argument (the line) of this algorithm. ParSol is the parameter of the point PntSol on the solution. ParArg is the parameter of the point PntSol on the second argument (the line). Exceptions StdFail_NotDone if the construction fails. Geom2dGcc_IsParallel if the solution and the second argument (the line) are parallel. Standard_OutOfRange if Index is less than zero or greater than the number of solutions computed by this algorithm.

 Standard_Boolean Geom2dGcc_Lin2dTanObl::IsDone ( ) const

Returns true if the construction algorithm does not fail (even if it finds no solution). Note: IsDone protects against a failure arising from a more internal intersection algorithm, which has reached its numeric limits.

 Standard_Boolean Geom2dGcc_Lin2dTanObl::IsParallel2 ( ) const

Returns true if the line and the solution are parallel. This is the case when the angle given at the time of construction is equal to 0 or Pi. Exceptions StdFail_NotDone if the construction fails.

 Standard_Integer Geom2dGcc_Lin2dTanObl::NbSolutions ( ) const

Returns the number of lines, representing solutions computed by this algorithm. Exceptions StdFail_NotDone if the construction fails.

 void Geom2dGcc_Lin2dTanObl::Tangency1 ( const Standard_Integer Index, Standard_Real & ParSol, Standard_Real & ParArg, gp_Pnt2d & PntSol ) const

Returns informations about the tangency point between the result and the first argument. ParSol is the intrinsic parameter of the point PntSol on the solution curv. ParArg is the intrinsic parameter of the point PntSol on the argument curv.

 gp_Lin2d Geom2dGcc_Lin2dTanObl::ThisSolution ( const Standard_Integer Index ) const

Returns a line, representing the solution of index Index computed by this algorithm. Exceptions Standard_OutOfRange if Index is less than zero or greater than the number of solutions computed by this algorithm. StdFail_NotDone if the construction fails.

 void Geom2dGcc_Lin2dTanObl::WhichQualifier ( const Standard_Integer Index, GccEnt_Position & Qualif1 ) const

Returns the qualifier Qualif1 of the tangency argument for the solution of index Index computed by this algorithm. The returned qualifier is:

• that specified at the start of construction when the solutions are defined as enclosing or outside with respect to the argument, or
• that computed during construction (i.e. enclosing or outside) when the solutions are defined as unqualified with respect to the argument, or
• GccEnt_noqualifier if the tangency argument is a point. Exceptions Standard_OutOfRange if Index is less than zero or greater than the number of solutions computed by this algorithm. StdFail_NotDone if the construction fails.

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