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Public Member Functions
GccAna_Lin2d2Tan Class Reference

This class implements the algorithms used to
create 2d lines tangent to 2 other elements which
can be circles or points.
Describes functions for building a 2D line:
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#include <GccAna_Lin2d2Tan.hxx>

Public Member Functions

DEFINE_STANDARD_ALLOC GccAna_Lin2d2Tan (const gp_Pnt2d &ThePoint1, const gp_Pnt2d &ThePoint2, const Standard_Real Tolerance)
 This methods implements the algorithms used to
create 2d lines passing thrue 2 points.
Tolerance is used because we can't create a line
when the distance between the two points is too small.

 GccAna_Lin2d2Tan (const GccEnt_QualifiedCirc &Qualified1, const gp_Pnt2d &ThePoint, const Standard_Real Tolerance)
 This methods implements the algorithms used to
create 2d lines tangent to one circle and passing
thrue a point.
Exception BadQualifier is raised in the case of
EnclosedCirc
Tolerance is used because there is no solution
when the point is inside the solution according to
the tolerance.

 GccAna_Lin2d2Tan (const GccEnt_QualifiedCirc &Qualified1, const GccEnt_QualifiedCirc &Qualified2, const Standard_Real Tolerance)
 This methods implements the algorithms used to
create 2d lines tangent to 2 circles.
Exception BadQualifier is raised in the case of
EnclosedCirc

Standard_Boolean IsDone () const
 This method returns true when there is a solution
and false in the other cases.

Standard_Integer NbSolutions () const
 This method returns the number of solutions.
Raises NotDone if the construction algorithm didn't succeed.

gp_Lin2d ThisSolution (const Standard_Integer Index) const
 Returns the solution number Index and raises OutOfRange
exception if Index is greater than the number of solutions.
Be carefull: the Index is only a way to get all the
solutions, but is not associated to theses outside the
context of the algorithm-object. Raises OutOfRange is raised if Index is greater than
the number of solutions.
It raises NotDone if the algorithm failed.

void WhichQualifier (const Standard_Integer Index, GccEnt_Position &Qualif1, GccEnt_Position &Qualif2) const
 Returns the qualifiers Qualif1 and Qualif2 of the
tangency arguments for the solution of index Index
computed by this algorithm.
The returned qualifiers are:

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 number Index 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. Raises OutOfRange is raised if Index is greater than
the number of solutions.
It raises NotDone if the algorithm failed.

void Tangency2 (const Standard_Integer Index, Standard_Real &ParSol, Standard_Real &ParArg, gp_Pnt2d &PntSol) const
 Returns informations about the tangency point between the
result number Index and the second argument.
ParSol is the intrinsic parameter of the point ParSol on
the solution curv.
ParArg is the intrinsic parameter of the point PntSol on
the argument curv. Raises OutOfRange is raised if Index is greater than
the number of solutions.
It raises NotDone if the algorithm failed.


Detailed Description


Constructor & Destructor Documentation


Member Function Documentation

void GccAna_Lin2d2Tan::Tangency1 ( const Standard_Integer  Index,
Standard_Real ParSol,
Standard_Real ParArg,
gp_Pnt2d PntSol 
) const
void GccAna_Lin2d2Tan::Tangency2 ( const Standard_Integer  Index,
Standard_Real ParSol,
Standard_Real ParArg,
gp_Pnt2d PntSol 
) const
  • those specified at the start of construction when the
    solutions are defined as enclosing or outside with
    respect to the arguments, or
  • those computed during construction (i.e. enclosing or
    outside) when the solutions are defined as unqualified
    with respect to the arguments, 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: