-- File:	Transition.cdl
-- Created:	Wed May  6 14:09:43 1992
-- Author:	Jacques GOUSSARD
--		<jag@sdsun1>
---Copyright:	 Matra Datavision 1992



class Transition from IntSurf

	---Purpose: Definition of the transition at the intersection
	--          between an intersection line and a restriction curve
	--          on a surface.

uses TypeTrans from IntSurf,
     Situation from IntSurf

raises DomainError from Standard

is

    Create
    
	---Purpose: Empty constructor. Creates an UNDECIDED transition.
    
    	returns Transition from IntSurf;


    Create(Tangent: Boolean from Standard; Type: TypeTrans from IntSurf)
    
	---Purpose: Create a IN or OUT transition

       	returns Transition from IntSurf;


    Create(Tangent: Boolean from Standard;
           Situ: Situation from IntSurf; Oppos: Boolean from Standard)
    
	---Purpose: Create a TOUCH transition.
    
    	returns Transition from IntSurf;


    SetValue(me: in out; Tangent: Boolean from Standard;
             Type: TypeTrans from IntSurf)

	---Purpose: Set the values of an IN or OUT transition.
    	 
	---C++: inline

    	is static;


    SetValue(me: in out; Tangent: Boolean from Standard;
             Situ: Situation from IntSurf; Oppos: Boolean from Standard)

	---Purpose: Set the values of a TOUCH transition.
    
	---C++: inline

    	is static;


    SetValue(me: in out)

	---Purpose: Set the values of an UNDECIDED transition.

	---C++: inline

    	is static;


    TransitionType(me)

    	---Purpose: Returns the type of Transition (in/out/touch/undecided)
    	--          for the arc given by value. This the transition of
    	--          the intersection line compared to the Arc of restriction,
    	--          i-e when the function returns INSIDE for example, it
    	--          means that the intersection line goes inside the 
    	--          part of plane limited by the arc of restriction.

    	returns TypeTrans from IntSurf
	---C++: inline

    	is static;


    IsTangent(me)
    
    	---Purpose: Returns TRUE if the point is tangent to the arc
    	--          given by Value.
    	--          An exception is raised if TransitionType returns UNDECIDED.

    	returns Boolean from Standard
	---C++: inline
	
	raises DomainError from Standard

    	is static;


    Situation(me)
    
	---Purpose: Returns a significant value if TransitionType returns
	--          TOUCH. In this case, the function returns :
	--          INSIDE when the intersection line remains inside the Arc,
	--          OUTSIDE when it remains outside the Arc,
	--          UNKNOWN when the calsulus cannot give results.
	--          If TransitionType returns IN, or OUT, or UNDECIDED, a
	--          exception is raised.

    	returns Situation from IntSurf
	---C++: inline
	
	raises DomainError from Standard
	
	is static;


    IsOpposite(me)
    
    	---Purpose: returns a significant value if TransitionType returns
    	--          TOUCH. 
    	--          In this case, the function returns true when
    	--          the 2 curves locally define two different parts of the
    	--          space.
    	--          If TransitionType returns IN or OUT or UNDECIDED, an
    	--          exception is raised.

    	returns Boolean from Standard
	---C++: inline

        raises DomainError from Standard
	
    	is static;


fields

    tangent : Boolean   from Standard;
    typetra : TypeTrans from IntSurf;
    situat  : Situation from IntSurf;
    oppos   : Boolean   from Standard;

end Transition;