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Public Member Functions
Geom2dGcc_Circ2dTanCen Class Reference

This class implements the algorithms used to
create 2d circles tangent to a curve and
centered on a point.
The arguments of all construction methods are :
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#include <Geom2dGcc_Circ2dTanCen.hxx>

Public Member Functions

DEFINE_STANDARD_ALLOC Geom2dGcc_Circ2dTanCen (const Geom2dGcc_QualifiedCurve &Qualified1, const Handle< Geom2d_Point > &Pcenter, const Standard_Real Tolerance)
 Constructs one or more 2D circles tangential to the
curve Qualified1 and centered on the point Pcenter.
Tolerance is a tolerance criterion used by the algorithm
to find a solution when, mathematically, the problem
posed does not have a solution, but where there is
numeric uncertainty attached to the arguments.
Tolerance is only used in these algorithms in very
specific cases where the center of the solution is very
close to the circle to which it is tangential, and where the
solution is thus a very small circle.
Exceptions
GccEnt_BadQualifier if a qualifier is inconsistent with
the argument it qualifies (for example, enclosing for a line).

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.

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

gp_Circ2d ThisSolution (const Standard_Integer Index) const
 Returns a circle, representing the solution of index
Index computed by this algorithm.
Warning
This indexing simply provides a means of consulting the
solutions. The index values are not associated with
these solutions outside the context of the algorithm object.
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 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:

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.
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.

Standard_Boolean IsTheSame1 (const Standard_Integer Index) const
 Returns true if the solution of index Index and the first
argument of this algorithm are the same (i.e. there are 2
identical circles).
If Rarg is the radius of the first argument, Rsol is the
radius of the solution and dist is the distance between
the two centers, we consider the two circles to be
identical if |Rarg - Rsol| and dist are less than
or equal to the tolerance criterion given at the time of
construction of this algorithm.
NotDone is raised if the construction algorithm didn't succeed.
OutOfRange is raised if Index is greater than the
number of solutions.


Detailed Description


Constructor & Destructor Documentation


Member Function Documentation

void Geom2dGcc_Circ2dTanCen::Tangency1 ( const Standard_Integer  Index,
Standard_Real ParSol,
Standard_Real ParArg,
gp_Pnt2d PntSol 
) const
  • that specified at the start of construction when the
    solutions are defined as enclosed, enclosing or
    outside with respect to the argument, or
  • that computed during construction (i.e. enclosed,
    enclosing or outside) when the solutions are defined
    as unqualified with respect to the argument.
    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: