-- File:	IntersectionSegment.cdl
-- Created:	Fri Apr  3 14:45:13 1992
-- Author:	Laurent BUCHARD
--		<lbr@topsn2>
---Copyright:	 Matra Datavision 1992


class IntersectionSegment from IntRes2d

    ---Purpose: Definition of an intersection curve between
    --          two 2D curves.


inherits Storable from Standard

uses IntersectionPoint from IntRes2d

raises DomainError from Standard

is

    Create

      	---Purpose: Empty constructor.

    	returns IntersectionSegment from IntRes2d;


    Create(P1,P2       : IntersectionPoint from IntRes2d; 
           Oppos       : Boolean           from Standard;  
           ReverseFlag : Boolean           from Standard)
	   
    	--Purpose: Creates   an    IntersectionSegment    from     two
    	--         IntersectionPoint.  Oppos is  True if the  2 curves
    	--         have the same orientation.  if ReverseFlag is True,
    	--         P1 and P2 are the point on the  first curve, and on
    	--         the  second curve.  else, P1  is   the point on the
    	--         second curve and P2  the intersection point  on the
    	--         first curve.  	

    	---C++: inline
    
    	returns IntersectionSegment from IntRes2d;
	

    Create(P          : IntersectionPoint from IntRes2d; 
           First      : Boolean           from Standard; 
           Oppos      : Boolean           from Standard; 
           ReverseFlag: Boolean           from Standard)
	   
	--Purpose: Creates  a  semi-infinite  segment of intersection.
	--         if First is  set to True,  P is  the first point of
	--         the segment. Otherwise P is  the  last point of the
	--         segment.    P  belongs   to  the   first  curve  if
	--         ReversedFlag is set  to False; otherwise it belongs
	--         to the second curve.

      	---C++: inline
    
    	returns IntersectionSegment from IntRes2d;


    Create(Oppos: Boolean from Standard)
    
	---Purpose: Creates an infinite segment of intersection.

 	---C++: inline

    	returns IntersectionSegment from IntRes2d;


    IsOpposite(me)
    
	---Purpose: Returns TRUE if the intersection segment has got
	--          the same orientation on both curves.

	---C++: inline

    	returns Boolean from Standard
	is static;
	

    HasFirstPoint(me)
    
	---Purpose: Returns True if the segment is  limited by a first
	--          point.   This  point defines  the lowest parameter
	--          admitted on the first  curve for the  segment.  If
	--          IsOpposite  returns  False, it  defines the lowest
	--          parameter on the  second curve, otherwise,  it  is
	--          the highest parameter on the second curve.

	---C++: inline

    	returns Boolean from Standard
	is static;


    FirstPoint(me)
    
	---Purpose: Returns the  first point   of the segment    as an
	--          IntersectionPoint (with    a    transition).   The
	--          exception  DomainError  is raised if HasFirstPoint
	--          returns False.

	---C++: inline
    	---C++: return const &
       
    	returns IntersectionPoint from IntRes2d
	raises  DomainError       from Standard
	is static;


    HasLastPoint(me)
    
	---Purpose: Returns True if the segment  is  limited by a last
	--          point.  This point  defines  the highest parameter
	--          admitted on the  first curve for  the segment.  If
	--          IsOpposite returns  False, it  defines the highest
	--          parameter on  the  second curve, otherwise, it  is
	--          the lowest parameter on the second curve.

	---C++: inline

    	returns Boolean from Standard
	is static;


    LastPoint(me)
    
	---Purpose: Returns   the  last point  of the    segment as an
	--          IntersectionPoint   (with  a    transition).   The
	--          exception        DomainError     is   raised    if
	--          HasLastExtremity returns False.

	---C++: inline
    	---C++: return const &
       
    	returns IntersectionPoint from IntRes2d
	raises  DomainError       from Standard
	is static;
	

fields

    oppos   : Boolean           from Standard;
    first   : Boolean           from Standard;
    last    : Boolean           from Standard;
    ptfirst : IntersectionPoint from IntRes2d;
    ptlast  : IntersectionPoint from IntRes2d;

end IntersectionSegment;