-- File:	Blend_SurfPointFuncInv.cdl
-- Created:	Wed Feb 12 11:16:58 1997
-- Author:	Laurent BOURESCHE
--		<lbo@pomalox.paris1.matra-dtv.fr>
---Copyright:	 Matra Datavision 1997

deferred class SurfPointFuncInv from Blend


inherits FunctionSetWithDerivatives from math 


    ---Purpose: Deferred   class  for a  function  used  to compute  a
    --          blending surface between a  surface and a curve, using
    --          a  guide  line.   This   function is  used  to find  a
    --          solution on a done point of the curve.
    --          
    --          The vector <X>  used in Value, Values and  Derivatives
    --          methods  has  to   be the  vector   of the  parametric
    --          coordinates w, U,  V where w is  the parameter  on the
    --          guide line, U,V   are the parametric coordinates of  a
    --          point on the partner surface.

uses
    Pnt    from gp,
    Vector from math,
    Matrix from math

is

    NbVariables(me)
    ---Purpose: Returns 3.
    returns Integer from Standard
    is static;

    NbEquations(me)
    ---Purpose: returns the number of equations of the function.
    returns Integer from Standard
    is deferred;

    Value(me: in out; X: Vector; F: out Vector)
    ---Purpose: computes the values <F> of the Functions for the 
    --          variable <X>.
    --          Returns True if the computation was done successfully, 
    --          False otherwise.
    returns Boolean from Standard
    is deferred;
    
    Derivatives(me: in out; X: Vector; D: out Matrix)
    ---Purpose: returns the values <D> of the derivatives for the 
    --          variable <X>.
    --          Returns True if the computation was done successfully, 
    --          False otherwise.
    returns Boolean from Standard
    is deferred;
    
    Values(me: in out; X: Vector; F: out Vector; D: out Matrix)
    ---Purpose: returns the values <F> of the functions and the derivatives
    --          <D> for the variable <X>.
    --          Returns True if the computation was done successfully, 
    --          False otherwise.
    returns Boolean from Standard
    is deferred;

    Set(me: in out; P : Pnt from gp)
    ---Purpose: Set the Point on which a solution has to be found. 
    is deferred;

    GetTolerance(me; Tolerance: out Vector from math; Tol: Real from Standard)
    ---Purpose: Returns in the vector Tolerance the parametric tolerance
    --          for each of the 3 variables;
    --          Tol is the tolerance used in 3d space.
    is deferred;

    GetBounds(me; InfBound,SupBound: out Vector from math)
    ---Purpose: Returns in the vector InfBound the lowest values allowed
    --          for each of the 3 variables.
    --          Returns in the vector SupBound the greatest values allowed
    --          for each of the 3 variables.
    is deferred;


    IsSolution(me: in out; Sol: Vector from math; Tol: Real from Standard)
    ---Purpose: Returns Standard_True if Sol is a zero of the function.
    --          Tol is the tolerance used in 3d space.
    returns Boolean from Standard
    is deferred;


end SurfPointFuncInv;