-- File:	AIS_Chamf3dDimension.cdl
-- Created:	Thu Dec  5 09:19:29 1996
-- Author:	Odile Olivier
--		<odl@sacadox.paris1.matra-dtv.fr>
---Copyright:	 Matra Datavision 1996


class Chamf3dDimension from AIS inherits Relation from AIS

	---Purpose: A framework to define display of 3D chamfers.
    	-- A chamfer is displayed with arrows and text. The text
    	-- gives the length of the chamfer if it is a symmetrical
    	-- chamfer, or the angle if it is not.


uses

    PresentationManager3d from PrsMgr,
    Presentation          from Prs3d,
    Selection             from SelectMgr,
    Shape                 from TopoDS,
    Pnt                   from gp,
    Dir                   from gp,
    Projector             from Prs3d,
    Transformation        from Geom,
    PresentationManager2d from PrsMgr,
    GraphicObject         from Graphic2d,    
    ExtendedString        from TCollection,
    ArrowSide             from DsgPrs,
    KindOfDimension       from AIS 
    
is
    Create (aFShape     : Shape          from TopoDS;
	    aVal        : Real           from Standard;
	    aText       : ExtendedString from TCollection)	    
	 ---Purpose:  Constructs a display object for 3D chamfers.
    	 -- This object is defined by the shape aFShape, the
    	 -- dimension aVal and the text aText.
    returns mutable Chamf3dDimension from AIS;

    Create (aFShape     : Shape          from TopoDS;
	    aVal        : Real           from Standard;
	    aText       : ExtendedString from TCollection;	    
	    aPosition   : Pnt            from gp;
	    aSymbolPrs  : ArrowSide      from DsgPrs;    
    	    anArrowSize : Real           from Standard = 0.0)
	 ---Purpose:  Constructs a display object for 3D chamfers.
    	 -- This object is defined by the shape aFShape, the
    	 -- dimension aVal, the text aText, the point of origin of
    	 -- the chamfer aPosition, the type of arrow aSymbolPrs
    	 -- with the size anArrowSize.
    returns mutable Chamf3dDimension from AIS;

    KindOfDimension(me) 
	 ---Purpose: Indicates that we are concerned with a 3d length.
	 ---C++: inline
    returns KindOfDimension from AIS 
    is redefined;
    
    IsMovable(me) returns Boolean from Standard 
	 ---C++: inline    
	 ---Purpose: Returns true if the 3d chamfer dimension is movable.
    is redefined;
    
    -- Methods from PresentableObject
    
    Compute(me            : mutable;
  	    aPresentationManager: PresentationManager3d from PrsMgr;
    	    aPresentation : mutable Presentation from Prs3d;
    	    aMode         : Integer from Standard= 0) 
    is redefined static private;
    
    Compute(me:mutable;
    	        aProjector: Projector from Prs3d;
                aPresentation: mutable Presentation from Prs3d)
    is redefined static private;     

    Compute(me:mutable;
    	    aPresentationManager: PresentationManager2d from PrsMgr;
            aPresentation: mutable GraphicObject from Graphic2d;
            aMode: Integer from Standard = 0)
    is redefined static private;	    
    Compute(me            : mutable;
    	    aProjector    : Projector from Prs3d;
    	    aTrsf         : Transformation from Geom;
	    aPresentation : mutable Presentation from Prs3d)
    is redefined;
	 ---Purpose: computes the presentation according to a point of view
	 --          given by <aProjector>. 
	 --          To be Used when the associated degenerated Presentations 
 	 --          have been transformed by <aTrsf> which is not a Pure
	 --          Translation. The HLR Prs can't be deducted automatically
  	 --          WARNING :<aTrsf> must be applied
   	 --           to the object to display before computation  !!!

    ComputeSelection(me         : mutable;
    	    	     aSelection : mutable Selection from SelectMgr;
    	    	     aMode      : Integer from Standard)
    is redefined private;
    
    
    
fields

    myPntAttach : Pnt     from gp;
    myDir       : Dir     from gp;

end Chamf3dDimension;