-- File:	Geom2d_AxisPlacement.cdl
-- Created:	Wed Mar 24 17:33:01 1993
-- Author:	JCV
--		<fid@sdsun2>
-- Copyright:	 Matra Datavision 1993

---Copyright:   Matra Datavision 1991



class AxisPlacement from Geom2d inherits Geometry from Geom2d


        --- Purpose : Describes an axis in 2D space.
    	-- An axis is defined by:
    	-- - its origin, also termed the "Location point" of the axis,
    	-- - its unit vector, termed the "Direction" of the axis.
    	-- Note: Geom2d_AxisPlacement axes provide the
    	-- same kind of "geometric" services as gp_Ax2d axes
    	-- but have more complex data structures. The
    	-- geometric objects provided by the Geom2d package
    	-- use gp_Ax2d objects to include axes in their data
    	-- structures, or to define an axis of symmetry or axis of rotation.
    	-- Geom2d_AxisPlacement axes are used in a context
    	-- where they can be shared by several objects
    	-- contained inside a common data structure.

uses Ax2d   from gp,
     Dir2d  from gp,
     Pnt2d  from gp,
     Trsf2d from gp,
     Vec2d  from gp


is

  Create (A : Ax2d)  returns mutable AxisPlacement;
        --- Purpose : Constructs an axis by conversion of the gp_Ax2d axis A.


  Create (P : Pnt2d; V : Dir2d)  returns mutable AxisPlacement;
	--- Purpose : Constructs an axis from a given origin P and unit vector V.
       

  Reverse (me : mutable);

  Reversed (me)  returns mutable AxisPlacement  is static;
    	---Purpose: Reverses the unit vector of this axis.
    	-- Note:
    	-- - Reverse assigns the result to this axis, while
    	-- - Reversed creates a new one.

  SetAxis (me : mutable; A : Ax2d);
        --- Purpose : Changes the complete definition of the axis placement.


  SetDirection (me : mutable; V : Dir2d);
        --- Purpose :
        --  Changes the "Direction" of the axis placement.



  SetLocation (me : mutable; P : Pnt2d);
        --- Purpose :
        --  Changes the "Location" point (origin) of the axis placement.


  Angle (me; Other : AxisPlacement)  returns Real;
        --- Purpose :
        --  Computes the angle between the "Direction" of 
        --  two axis placement in radians.
    	-- The result is comprised between -Pi and Pi.

  Ax2d (me)  returns Ax2d;
        --- Purpose : Converts this axis into a gp_Ax2d axis.


  Direction (me)   returns Dir2d;
        --- Purpose : Returns the "Direction" of <me>.
    	-- -C++: return const&


  Location (me)  returns Pnt2d;
      	--- Purpose : 
      	--  Returns the "Location" point (origin) of the axis placement.
    	-- -C++: return const&




  Transform (me : mutable; T : Trsf2d);

    	---Purpose: Applies the transformation T to this axis.


  Copy (me)  returns mutable like me;
  
    	---Purpose: Creates a new object which is a copy of this axis.     
fields

  axis : Ax2d;

end;