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-- File: Lin2dBisec.cdl
-- Created: Wed Apr 3 11:29:37 1991
-- Author: Remi GILET
-- <reg@topsn2>
---Copyright: Matra Datavision 1991
class Lin2dBisec
from GccAna
---Purpose: Describes functions for building bisecting lines between two 2D lines.
-- A bisecting line between two lines is such that each of its
-- points is at the same distance from the two lines.
-- If the two lines are secant, there are two orthogonal
-- bisecting lines which share the angles made by the two
-- straight lines in two equal parts. If D1 and D2 are the
-- unit vectors of the two straight lines, those of the two
-- bisecting lines are collinear with the following vectors:
-- - D1 + D2 for the "internal" bisecting line,
-- - D1 - D2 for the "external" bisecting line.
-- If the two lines are parallel, the (unique) bisecting line is
-- the straight line equidistant from the two straight lines. If
-- the two straight lines are coincident, the algorithm
-- returns the first straight line as the solution.
-- A Lin2dTanObl object provides a framework for:
-- - defining the construction of the bisecting lines,
-- - implementing the construction algorithm, and
-- - consulting the result.
uses Lin2d from gp,
Pnt2d from gp,
Array1OfReal from TColStd,
Array1OfLin2d from TColgp,
Array1OfPnt2d from TColgp
raises OutOfRange from Standard,
NotDone from StdFail
is
Create(Lin1 : Lin2d from gp ;
Lin2 : Lin2d from gp ) returns Lin2dBisec;
---Purpose: Constructs bisecting lines between the two lines Lin1 and Lin2.
IsDone(me) returns Boolean from Standard
is static;
---Purpose: Returns True when the algorithm succeded.
NbSolutions(me) returns Integer from Standard
raises NotDone
is static;
---Purpose: Returns the number of solutions and raise NotDone if
-- the constructor wasn't called before.
ThisSolution(me ;
Index : Integer from Standard) returns Lin2d
---Purpose :Returns the solution number Index .
-- The first solution is the inside one and the second is the
-- outside one.
-- For the first solution the direction is D1+D2 (D1 is
-- the direction of the first argument and D2 the
-- direction of the second argument).
-- For the second solution the direction is D1-D2.
-- Raises NotDone if the construction algorithm
-- didn't succeed.
-- It raises OutOfRange if Index is greater than the
-- number of solutions.
raises OutOfRange, NotDone
is static;
Intersection1 (me ;
Index : Integer from Standard;
ParSol,ParArg : out Real from Standard;
PntSol : out Pnt2d from gp )
---Purpose: Returns informations about the intersection point between
-- the result number Index and the first argument.
-- Raises NotDone if the construction algorithm didn't succeed.
-- It raises OutOfRange if Index is greater than the
-- number of solutions.
raises OutOfRange, NotDone
is static;
Intersection2 (me ;
Index : Integer from Standard;
ParSol,ParArg : out Real from Standard;
PntSol : out Pnt2d from gp )
---Purpose: Returns informations about the intersection point between
-- the result number Index and the second argument.
-- Raises NotDone if the construction algorithm
-- didn't succeed.
-- It raises OutOfRange if Index is greater than the
-- number of solutions.
raises OutOfRange, NotDone
is static;
fields
WellDone : Boolean from Standard;
---Purpose: True if the algorithm succeeded.
NbrSol : Integer from Standard;
---Purpose: The number of possible solutions. We have to decide about the
-- status of the multiple solutions...
linsol : Array1OfLin2d from TColgp;
---Purpose : The solutions.
pntint1sol : Array1OfPnt2d from TColgp;
---Purpose: The tangency point between the solution and the
-- first argument on the solution.
pntint2sol : Array1OfPnt2d from TColgp;
---Purpose: The tangency point between the solution and the
-- second argument on the solution.
par1sol : Array1OfReal from TColStd;
---Purpose: The parameter of the tangency point between the solution
-- and the first argument on the solution.
par2sol : Array1OfReal from TColStd;
---Purpose: The parameter of the tangency point between the solution
-- and the second argument on the solution.
pararg1 : Array1OfReal from TColStd;
---Purpose: The parameter of the tangency point between the solution
-- and the first argument on the first argument.
pararg2 : Array1OfReal from TColStd;
---Purpose: The parameter of the tangency point between the solution
-- and the second argument on the second argument.
end Lin2dBisec;
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