---Copyright:   Matra Datavision 1991


class Pln   from gp   inherits Storable


        --- Purpose :Describes a plane.
        -- A plane is positioned in space with a coordinate system
        -- (a gp_Ax3 object), such that the plane is defined by the
        -- origin, "X Direction" and "Y Direction" of this coordinate
        -- system, which is the "local coordinate system" of the
        -- plane. The "main Direction" of the coordinate system is a
        -- vector normal to the plane. It gives the plane an implicit
        -- orientation such that the plane is said to be "direct", if the
        -- coordinate system is right-handed, or "indirect" in the other case.
        -- Note: when a gp_Pln plane is converted into a
        -- Geom_Plane plane, some implicit properties of its local
        -- coordinate system are used explicitly:
        -- -   its origin defines the origin of the two parameters of
        --   the planar surface,
        -- -   its implicit orientation is also that of the Geom_Plane.
        -- See Also
        -- gce_MakePln which provides functions for more complex
        -- plane constructions
        -- Geom_Plane which provides additional functions for
        -- constructing planes and works, in particular, with the
        -- parametric equations of planes
        
uses Ax1  from gp,
     Ax2  from gp,
     Ax3  from gp,
     Dir  from gp,
     Lin  from gp,
     Pnt  from gp,
     Trsf from gp,
     Vec  from gp

raises ConstructionError from Standard


is

  

  Create   returns Pln;
        ---C++:inline
        --- Purpose : Creates a plane coincident with OXY plane of the
	--            reference coordinate system.

  Create (A3 : Ax3)   returns Pln;
        ---C++:inline
        --- Purpose :
        --  The coordinate system of the plane is defined with the axis
        --  placement A3.
        --  The "Direction" of A3 defines the normal to the plane.
        --  The "Location" of A3 defines the location (origin) of the plane.
        --  The "XDirection" and "YDirection" of A3 define the "XAxis" and
        --  the "YAxis" of the plane used to parametrize the plane.

  Create (P : Pnt; V : Dir)  returns Pln;
        --- Purpose :
        --  Creates a plane with the  "Location" point <P>
        --  and the normal direction <V>.

  Create (A, B, C, D : Real)   returns Pln
        --- Purpose :
        --  Creates a plane from its cartesian equation :
        --  A * X + B * Y + C * Z + D = 0.0 
    	--  Raises ConstructionError if Sqrt (A*A + B*B + C*C) <= Resolution from gp.
     raises ConstructionError;
       

  Coefficients (me; A, B ,C ,D : out Real)   is static;
        ---C++:inline
        --- Purpose :
        --  Returns the coefficients of the plane's cartesian equation :
        --  A * X + B * Y + C * Z + D = 0.

  SetAxis (me : in out; A1 : Ax1)
        ---C++: inline
        --- Purpose : Modifies this plane, by redefining its local coordinate system so that
        -- -   its origin and "main Direction" become those of the
        --   axis A1 (the "X Direction" and "Y Direction" are then recomputed).
        --  Raises ConstructionError if the A1 is parallel to the "XAxis" of the plane.
     raises ConstructionError
       
     is static;

  SetLocation (me : in out; Loc : Pnt)   is static;
        ---C++:inline
        --- Purpose : Changes the origin of the plane.

  SetPosition (me : in out; A3 : Ax3)    is static;
       ---C++:inline
       --- Purpose : Changes the local coordinate system of the plane.

  UReverse (me : in out)
        ---C++:inline
	---Purpose: Reverses the   U   parametrization of   the  plane
	--          reversing the XAxis.
  is static;

  VReverse (me : in out)
        ---C++:inline
	---Purpose: Reverses the   V   parametrization of   the  plane
	--          reversing the YAxis.
  is static;

  Direct (me) returns Boolean from Standard
        ---C++:inline
        ---Purpose: returns true if the Ax3 is right handed.
  is static;

  Axis (me)  returns Ax1  is static;
        ---C++:inline 
        --- Purpose : Returns the plane's normal Axis.
    	---C++: return const&

  Location (me)  returns Pnt   is static;
        --- Purpose : Returns the plane's location (origin).
        ---C++: inline
    	---C++: return const&

  Position (me)  returns Ax3   is static;
        --- Purpose : Returns the local coordinate system of the plane .
        ---C++: inline
    	---C++: return const&

  Distance (me; P : Pnt)  returns Real             is static;
        ---C++: inline
        --- Purpose : Computes the distance between <me> and the point <P>.

  Distance (me; L : Lin)   returns Real            is static;
        ---C++: inline
        --- Purpose : Computes the distance between <me> and the line <L>.

  Distance (me; Other : Pln)   returns Real        is static;
        ---C++: inline
        --- Purpose : Computes the distance between two planes.

  SquareDistance (me; P : Pnt)   returns Real      is static;
        ---C++: inline
        --- Purpose :
        --  Computes the square distance between <me> and the point <P>.

  SquareDistance (me; L : Lin)   returns Real      is static;
        ---C++: inline
        --- Purpose :
        --  Computes the square distance between <me> and the line <L>.

  SquareDistance (me; Other : Pln)   returns Real  is static;
        ---C++: inline
        --- Purpose :
        --  Computes the square distance between two planes.

  XAxis (me)  returns Ax1    is static;
        ---C++:inline
        --- Purpose : Returns the X axis of the plane.

  YAxis (me)  returns Ax1    is static;
        ---C++:inline
        --- Purpose : Returns the Y axis  of the plane.

  Contains (me; P : Pnt; LinearTolerance : Real)  returns Boolean
     is static;
        ---C++: inline
        ---Purpose: Returns true if this plane contains the point P. This means that
        -- -   the distance between point P and this plane is less
        --   than or equal to LinearTolerance, or
        -- -   line L is normal to the "main Axis" of the local
        --   coordinate system of this plane, within the tolerance
        --   AngularTolerance, and the distance between the origin
        --   of line L and this plane is less than or equal to
        --   LinearTolerance.


  Contains (me; L : Lin; LinearTolerance, AngularTolerance : Real)
     returns Boolean
     is static;
        ---C++: inline
        ---Purpose: Returns true if this plane contains the line L. This means that
        -- -   the distance between point P and this plane is less
        --   than or equal to LinearTolerance, or
        -- -   line L is normal to the "main Axis" of the local
        --   coordinate system of this plane, within the tolerance
        --   AngularTolerance, and the distance between the origin
        --   of line L and this plane is less than or equal to
        --   LinearTolerance.
     



  Mirror (me : in out; P : Pnt)          is static;

  Mirrored (me; P : Pnt)   returns Pln   is static;


        --- Purpose :
        --  Performs the symmetrical transformation of a plane with respect 
        --  to the point <P> which is the center of the symmetry
        -- Warnings :
        --  The normal direction to the plane is not changed.
        --  The "XAxis" and the "YAxis" are reversed. 


                    
  Mirror (me : in out; A1 : Ax1) 
         is static;

  Mirrored (me; A1 : Ax1)   returns Pln   is static;

       --- Purpose  : Performs   the symmetrical transformation  of a
        --  plane with respect to an axis placement  which is the axis
        --  of  the symmetry.  The  transformation is performed on the
        --  "Location" point, on  the "XAxis"  and the "YAxis".    The
        --  resulting normal  direction  is  the cross product between
        --  the "XDirection" and the "YDirection" after transformation
        --  if  the  initial plane was right  handed,  else  it is the
        --  opposite.



  Mirror (me : in out; A2 : Ax2)         
       is static;

  Mirrored (me; A2 : Ax2)   returns Pln  is static;

        --- Purpose :  Performs the  symmetrical transformation  of  a
        --  plane    with respect to    an axis  placement.   The axis
        --  placement  <A2> locates the plane  of  the symmetry.   The
        --  transformation is performed  on  the  "Location" point, on
        --  the  "XAxis" and  the    "YAxis".  The resulting    normal
        --  direction is the cross  product between   the "XDirection"
        --  and the "YDirection"  after  transformation if the initial
        --  plane was right handed, else it is the opposite.



  Rotate (me : in out; A1 : Ax1; Ang : Real)         
      ---C++:inline
      is static;

  Rotated (me; A1 : Ax1; Ang : Real)   returns Pln   is static;
        ---C++: inline
        --- Purpose :
        --  rotates a plane. A1 is the axis of the rotation.
        --  Ang is the angular value of the rotation in radians.


  Scale (me : in out; P : Pnt; S : Real)        
        ---C++: inline
      is static;

  Scaled (me; P : Pnt; S : Real)   returns Pln  is static;        
        ---C++: inline
        --- Purpose : 
        --  Scales a plane. S is the scaling value.
 

      
  Transform (me : in out; T : Trsf)         
        ---C++: inline
      is static;

  Transformed (me; T : Trsf)   returns Pln  is static;
        ---C++: inline
        --- Purpose :
        --  Transforms a plane with the transformation T from class Trsf.
        --  The transformation is performed on the "Location"
        --  point, on the "XAxis" and the "YAxis". 
        --  The resulting normal direction is the cross product between 
        --  the "XDirection" and the "YDirection" after transformation.

       

  Translate (me : in out; V : Vec)          
        ---C++: inline
     is static;

  Translated (me; V : Vec)   returns Pln    is static;
        ---C++: inline
        --- Purpose :
        --  Translates a plane in the direction of the vector V.
        --  The magnitude of the translation is the vector's magnitude.

    

  Translate (me : in out; P1, P2 : Pnt)        
        ---C++: inline
      is static;   

  Translated (me; P1, P2 : Pnt)   returns Pln  is static;
        ---C++: inline
        --- Purpose :
        --  Translates a plane from the point P1 to the point P2.        


fields

  pos : Ax3;

end;