-- File:	Prs3d_ArrowAspect.cdl
-- Created:	Fri Jun 11 11:28:18 1993
-- Author:	Jean-Louis FRENKEL
--		<jlf@stylox>
-- Modified	GG : GER61351 01/02/00 Add SetColor() & Aspect() methods
---Copyright:	 Matra Datavision 1993


class ArrowAspect from Prs3d inherits CompositeAspect from Prs3d
    	---Purpose: A framework for displaying arrows in representations
    	-- of dimensions and relations.
uses
    Length from Quantity,
    PlaneAngle from Quantity,
    NameOfColor from Quantity,
    Color       from Quantity,
    AspectLine3d from Graphic3d
    
raises
    InvalidAngle from Prs3d
    
is
    Create returns mutable ArrowAspect from Prs3d;
    	---Purpose: Constructs an empty framework for displaying arrows
    	-- in representations of lengths. The lengths displayed
    	-- are either on their own or in chamfers, fillets,
    	-- diameters and radii.    
    Create (anAngle: PlaneAngle from Quantity; aLength: Length from Quantity)
    returns mutable ArrowAspect from Prs3d;
    	--- Purpose: Constructs a framework to display an arrow with a
    	-- shaft of the length aLength and having a head with
    	-- sides at the angle anAngle from each other.   
        
    SetAngle(me: mutable; anAngle: PlaneAngle from Quantity)
    	---Purpose: defines the angle of the arrows.
    raises InvalidAngle from Prs3d
    is static;
    
    Angle(me) returns PlaneAngle from Quantity
    	---Purpose: returns the current value of the angle used when drawing an arrow.
    is static;
    
    SetLength(me: mutable; aLength: Length from Quantity)
	---Purpose: defines the length of the arrows.
    is static;
    
    Length(me) returns Length from Quantity
	---Purpose: returns the current value of the length used when drawing an arrow.
    is static;

    SetColor(me: mutable; aColor:  Color  from  Quantity);

    SetColor(me: mutable; aColor:  NameOfColor  from  Quantity);

    Aspect(me) returns AspectLine3d  from  Graphic3d;

    Print( me; s: in out OStream from Standard)
    is virtual;

fields
	    myArrowAspect: AspectLine3d  from  Graphic3d;
	    myAngle: PlaneAngle from Quantity;
	    myLength: Length from Quantity;

end ArrowAspect from Prs3d;