[occt.git] / src / ShapeExtend / ShapeExtend_CompositeSurface.cdl

-- Created on: 1999-04-27
-- Created by: Andrey BETENEV
-- Copyright (c) 1999 Matra Datavision
-- Copyright (c) 1999-2014 OPEN CASCADE SAS
--
-- This file is part of Open CASCADE Technology software library.
--
-- This library is free software; you can redistribute it and/or modify it under
-- the terms of the GNU Lesser General Public License version 2.1 as published
-- by the Free Software Foundation, with special exception defined in the file
-- OCCT_LGPL_EXCEPTION.txt. Consult the file LICENSE_LGPL_21.txt included in OCCT
-- distribution for complete text of the license and disclaimer of any warranty.
--
-- Alternatively, this file may be used under the terms of Open CASCADE
-- commercial license or contractual agreement.

class CompositeSurface from ShapeExtend inherits Surface from Geom

    ---Purpose: Composite surface is represented by a grid of surfaces
    --          (patches) connected geometrically. Patches may have different
    --          parametrisation ranges, but they should be parametrised in
    --          the same manner so that parameter of each patch (u,v) can be converted
    --          to global parameter on the whole surface (U,V) with help of linear
    --          transformation: 
    --
    --          for any i,j-th patch
    --          U = Ui + ( u - uijmin ) * ( Ui+1 - Ui ) / ( uijmax - uijmin )
    --          V = Vj + ( v - vijmin ) * ( Vj+1 - Vj ) / ( vijmax - vijmin )
    --
    --          where
    --
    --          [uijmin, uijmax] * [ vijmin, vijmax] - parametric range of i,j-th patch,
    --
    --          Ui (i=1,..,Nu+1), Vi (j=1,..,Nv+1) - values defining global 
    --          parametrisation by U and V (correspond to points between patches and 
    --          bounds, (Ui,Uj) corresponds to (uijmin,vijmin) on i,j-th patch) and to
    --          (u(i-1)(j-1)max,v(i-1)(j-1)max) on (i-1),(j-1)-th patch.
    --
    --          Geometrical connectivity is expressed via global parameters:
    --          S[i,j](Ui+1,V) = S[i+1,j](Ui+1,V) for any i, j, V
    --          S[i,j](U,Vj+1) = S[i,j+1](U,Vj+1) for any i, j, U
    --          It is checked with Precision::Confusion() by default.
    --
    --  NOTE 1: This class is inherited from Geom_Surface in order to
    --          make it more easy to store and deal with it. However, it should
    --          not be passed to standard methods dealing with geometry since 
    --          this type is not known to them.
    --  NOTE 2: Not all the inherited methods are implemented, and some are 
    --          implemented not in the full form.
    
uses 
    Pnt2d            from gp,
    Pnt              from gp,
    Vec              from gp,
    Trsf             from gp,
    Trsf2d           from gp,
    Surface          from Geom,
    Curve            from Geom,
    Array1OfReal     from TColStd,
    HArray1OfReal    from TColStd,
    HArray2OfSurface from TColGeom,
    Shape            from GeomAbs,
    Parametrisation  from ShapeExtend

is 
 
    Create returns mutable CompositeSurface from ShapeExtend; 
    	---Purpose: Empty constructor.
    
    Create (GridSurf: HArray2OfSurface from TColGeom; 
            param   : Parametrisation from ShapeExtend = ShapeExtend_Natural) 
    returns mutable CompositeSurface from ShapeExtend; 
    	---Purpose: Initializes by a grid of surfaces (calls Init()).
    
    Create (GridSurf: HArray2OfSurface from TColGeom; 
            UJoints, VJoints : Array1OfReal from TColStd) 
    returns mutable CompositeSurface from ShapeExtend; 
    	---Purpose: Initializes by a grid of surfaces (calls Init()).
    
    Init (me: mutable; GridSurf: HArray2OfSurface from TColGeom; 
            	       param   : Parametrisation from ShapeExtend = ShapeExtend_Natural) 
    returns Boolean; 
       	---Purpose: Initializes by a grid of surfaces.
       	--          All the Surfaces of the grid must have geometrical 
        --          connectivity as stated above.
	--          If geometrical connectivity is not satisfied, method 
        --          returns False. 
        --          However, class is initialized even in that case.
	--
	--          Last parameter defines how global parametrisation 
	--          (joint values) will be computed:
	--          ShapeExtend_Natural: U1 = u11min, Ui+1 = Ui + (ui1max-ui1min), etc.
	--          ShapeExtend_Uniform: Ui = i-1, Vj = j-1
	--          ShapeExtend_Unitary: Ui = (i-1)/Nu, Vi = (j-1)/Nv

    Init (me: mutable; GridSurf: HArray2OfSurface from TColGeom; 
            	       UJoints, VJoints : Array1OfReal from TColStd) 
    returns Boolean; 
       	---Purpose: Initializes by a grid of surfaces with given global
        --          parametrisation defined by UJoints and VJoints arrays,
        --          each having langth equal to number of patches in corresponding
        --          direction + 1. Global joint values should be sorted in 
        --          increasing order.
       	--          All the Surfaces of the grid must have geometrical 
        --          connectivity as stated above.
	--          If geometrical connectivity is not satisfied, method 
        --          returns False. 
        --          However, class is initialized even in that case.

    NbUPatches (me) returns Integer;
        ---Purpose: Returns number of patches in U direction.
       
    NbVPatches (me) returns Integer;
        ---Purpose: Returns number of patches in V direction.
       
    Patch (me; i, j: Integer) returns Surface from Geom;
       	---C++: return const &
       	---Purpose: Returns one surface patch 
       
    Patches (me) returns HArray2OfSurface from TColGeom;
       	---C++: return const &
       	---Purpose: Returns grid of surfaces
       
    UJointValues (me) returns HArray1OfReal from TColStd;
       	---Purpose: Returns the array of U values corresponding to joint
        --          points between patches as well as to start and end points,
	--          which define global parametrisation of the surface

    VJointValues (me) returns HArray1OfReal from TColStd;
       	---Purpose: Returns the array of V values corresponding to joint
        --          points between patches as well as to start and end points,
	--          which define global parametrisation of the surface

    UJointValue (me; i: Integer) returns Real;
        ---Purpose: Returns i-th joint value in U direction
	--          (1-st is global Umin, (NbUPatches()+1)-th is global Umax
	--          on the composite surface)

    VJointValue (me; j: Integer) returns Real;
        ---Purpose: Returns j-th joint value in V direction
	--          (1-st is global Vmin, (NbVPatches()+1)-th is global Vmax
	--          on the composite surface)
    
    SetUJointValues (me: mutable; UJoints: Array1OfReal from TColStd)
    returns Boolean;
       	---Purpose: Sets the array of U values corresponding to joint
        --          points, which define global parametrisation of the surface.
	--          Number of values in array should be equal to NbUPatches()+1.
	--          All the values should be sorted in increasing order.
	--          If this is not satisfied, does nothing and returns False.

    SetVJointValues (me: mutable; VJoints: Array1OfReal from TColStd)
    returns Boolean;
       	---Purpose: Sets the array of V values corresponding to joint
        --          points, which define global parametrisation of the surface
	--          Number of values in array should be equal to NbVPatches()+1.
	--          All the values should be sorted in increasing order.
	--          If this is not satisfied, does nothing and returns False.

    SetUFirstValue (me: mutable; UFirst: Real);
        ---Purpose: Changes starting value for global U parametrisation (all
	--          other joint values are shifted accordingly)

    SetVFirstValue (me: mutable; VFirst: Real);
        ---Purpose: Changes starting value for global V parametrisation (all
	--          other joint values are shifted accordingly)

    LocateUParameter(me; U: Real) returns Integer;
    	---Purpose: Returns number of col that contains given (global) parameter
    
    LocateVParameter(me; V: Real) returns Integer;
    	---Purpose: Returns number of row that contains given (global) parameter
    
    LocateUVPoint(me; pnt: Pnt2d from gp;
    	    	      i  : out Integer;
		      j  : out Integer);
	---Purpose: Returns number of row and col of surface that contains 
    	--          given point

    Patch(me; U, V: Real) returns Surface from Geom;
    	---C++: return const &
       	---Purpose: Returns one surface patch that contains given (global) parameters
    
    Patch(me; pnt: Pnt2d from gp) returns Surface from Geom;
       	---C++: return const &
       	---Purpose: Returns one surface patch that contains given point
    
    
    ---Advanced: Work with local parameters on patches
    
    ULocalToGlobal (me; i, j: Integer; u: Real) returns Real;
        ---Purpose: Converts local parameter u on patch i,j to global parameter U
    
    VLocalToGlobal (me; i, j: Integer; v: Real) returns Real;
        ---Purpose: Converts local parameter v on patch i,j to global parameter V
    
    LocalToGlobal (me; i, j: Integer; uv: Pnt2d from gp) returns Pnt2d from gp;
        ---Purpose: Converts local parameters uv on patch i,j to global parameters UV
    
    UGlobalToLocal (me; i, j: Integer; U: Real) returns Real;
        ---Purpose: Converts global parameter U to local parameter u on patch i,j
    
    VGlobalToLocal (me; i, j: Integer; V: Real) returns Real;
        ---Purpose: Converts global parameter V to local parameter v on patch i,j
    
    GlobalToLocal (me; i, j: Integer; UV: Pnt2d from gp) returns Pnt2d from gp;
        ---Purpose: Converts global parameters UV to local parameters uv on patch i,j
    
    GlobalToLocalTransformation (me; i, j : Integer; 
    	    	    	    	     uFact: out Real; Trsf: out Trsf2d from gp )
    returns Boolean;
        ---Purpose: Computes transformation operator and uFactor descrinbing affine
	--          transformation required to convert global parameters on composite
	--          surface to local parameters on patch (i,j):
	--          uv = ( uFactor, 1. ) X Trsf * UV;
	--          NOTE: Thus Trsf contains shift and scale by V, scale by U is stored in uFact.
	--          Returns True if transformation is not an identity
    
    
    ---Inherited: methods of Geom_Geometry and Geom_Surface
    
    Transform (me : mutable; T : Trsf) is redefined;
        ---Purpose: Applies transformation to all the patches

    Copy (me) returns mutable like me is redefined;
        ---Purpose: Returns a copy of the surface
    
    UReverse (me : mutable) is redefined;
        ---Purpose: NOT IMPLEMENTED (does nothing)

    UReversedParameter (me; U : Real) returns Real is redefined;
	---Purpose: Returns U

    VReverse (me : mutable) is redefined;
        ---Purpose: NOT IMPLEMENTED (does nothing)

    VReversedParameter (me; V : Real) returns Real is redefined;
	---Purpose: Returns V

    Bounds(me; U1, U2, V1, V2 : out Real) is redefined;
    	---Purpose: Returns the parametric bounds of grid
    
    IsUClosed (me) returns Boolean is redefined;
        ---Purpose: Returns True if grid is closed in U direction
	--          (i.e. connected with Precision::Confusion)
    
    IsVClosed (me) returns Boolean is redefined;
        ---Purpose: Returns True if grid is closed in V direction
	--          (i.e. connected with Precision::Confusion)

    IsUPeriodic (me) returns Boolean is redefined;
        ---Purpose: Returns False

    IsVPeriodic (me) returns Boolean is redefined;
        ---Purpose: Returns False

    UIso (me; U : Real) returns mutable Curve is redefined;
        ---Purpose: NOT IMPLEMENTED (returns Null curve)

    VIso (me; V : Real) returns mutable Curve is redefined;
        ---Purpose: NOT IMPLEMENTED (returns Null curve)


    Continuity (me) returns Shape from GeomAbs is redefined;
        ---Purpose: returns C0

    IsCNu (me; N : Integer) returns Boolean is redefined;
        ---Purpose: returns True if N <=0 

    IsCNv (me; N : Integer) returns Boolean is redefined;
        ---Purpose: returns True if N <=0 

    D0 (me; U, V : Real; P : out Pnt) is redefined;
    	---Purpose: Computes the point of parameter U,V on the grid.
    
    D1 (me; U, V : Real; P : out Pnt; D1U, D1V : out Vec) is redefined;
    	---Purpose: Computes the point P and the first derivatives in the
        --          directions U and V at this point.
    
    D2 (me; U, V : Real; P : out Pnt; D1U, D1V, D2U, D2V, D2UV : out Vec) is redefined;
        ---Purpose: Computes the point P, the first and the second derivatives in
        --          the directions U and V at this point.
    
    D3 (me; U, V : Real; P : out Pnt; 
      D1U, D1V, D2U, D2V, D2UV, D3U, D3V, D3UUV, D3UVV: out Vec) is redefined;
        ---Purpose: Computes the point P, the first,the second and the third 
        --          derivatives in the directions U and V at this point.
    
    DN (me; U, V : Real; Nu, Nv : Integer) returns Vec is redefined;
        ---Purpose: Computes the derivative of order Nu in the direction U and Nv
        --          in the direction V at the point P(U, V).
    
    Value(me; pnt: Pnt2d from gp) returns Pnt from gp;
    	 ---Purpose: Computes the point of parameter pnt on the grid.
    
    
    ---Private: internal methods
    
    ComputeJointValues (me: mutable; param : Parametrisation from ShapeExtend = ShapeExtend_Natural);
        ---Purpose: Computes Joint values according to parameter
	
    CheckConnectivity (me: mutable; prec: Real) returns Boolean;
        ---Purpose: Checks geometrical connectivity of the patches, including
	--          closedness (sets fields muUClosed and myVClosed)
	
fields 
 
    myPatches     : HArray2OfSurface from TColGeom; 
    myUJointValues: HArray1OfReal from TColStd;
    myVJointValues: HArray1OfReal from TColStd;
    myUClosed     : Boolean; -- closedness (periodicity) measured with Precision::Confusion()
    myVClosed     : Boolean;

end;
Commit	Line	Data
b311480e	1	-- Created on: 1999-04-27
	2	-- Created by: Andrey BETENEV
	3	-- Copyright (c) 1999 Matra Datavision
973c2be1	4	-- Copyright (c) 1999-2014 OPEN CASCADE SAS
b311480e	5	--
973c2be1	6	-- This file is part of Open CASCADE Technology software library.
b311480e	7	--
d5f74e42	8	-- This library is free software; you can redistribute it and/or modify it under
d5f74e42	9	-- the terms of the GNU Lesser General Public License version 2.1 as published
973c2be1	10	-- by the Free Software Foundation, with special exception defined in the file
	11	-- OCCT_LGPL_EXCEPTION.txt. Consult the file LICENSE_LGPL_21.txt included in OCCT
	12	-- distribution for complete text of the license and disclaimer of any warranty.
b311480e	13	--
973c2be1	14	-- Alternatively, this file may be used under the terms of Open CASCADE
973c2be1	15	-- commercial license or contractual agreement.
7fd59977	16
	17	class CompositeSurface from ShapeExtend inherits Surface from Geom
	18
	19	---Purpose: Composite surface is represented by a grid of surfaces
	20	-- (patches) connected geometrically. Patches may have different
	21	-- parametrisation ranges, but they should be parametrised in
	22	-- the same manner so that parameter of each patch (u,v) can be converted
	23	-- to global parameter on the whole surface (U,V) with help of linear
	24	-- transformation:
	25	--
	26	-- for any i,j-th patch
	27	-- U = Ui + ( u - uijmin ) * ( Ui+1 - Ui ) / ( uijmax - uijmin )
	28	-- V = Vj + ( v - vijmin ) * ( Vj+1 - Vj ) / ( vijmax - vijmin )
	29	--
	30	-- where
	31	--
	32	-- [uijmin, uijmax] * [ vijmin, vijmax] - parametric range of i,j-th patch,
	33	--
	34	-- Ui (i=1,..,Nu+1), Vi (j=1,..,Nv+1) - values defining global
	35	-- parametrisation by U and V (correspond to points between patches and
	36	-- bounds, (Ui,Uj) corresponds to (uijmin,vijmin) on i,j-th patch) and to
	37	-- (u(i-1)(j-1)max,v(i-1)(j-1)max) on (i-1),(j-1)-th patch.
	38	--
	39	-- Geometrical connectivity is expressed via global parameters:
	40	-- S[i,j](Ui+1,V) = S[i+1,j](Ui+1,V) for any i, j, V
	41	-- S[i,j](U,Vj+1) = S[i,j+1](U,Vj+1) for any i, j, U
	42	-- It is checked with Precision::Confusion() by default.
	43	--
	44	-- NOTE 1: This class is inherited from Geom_Surface in order to
	45	-- make it more easy to store and deal with it. However, it should
	46	-- not be passed to standard methods dealing with geometry since
	47	-- this type is not known to them.
	48	-- NOTE 2: Not all the inherited methods are implemented, and some are
	49	-- implemented not in the full form.
	50
	51	uses
	52	Pnt2d from gp,
	53	Pnt from gp,
	54	Vec from gp,
	55	Trsf from gp,
	56	Trsf2d from gp,
	57	Surface from Geom,
	58	Curve from Geom,
	59	Array1OfReal from TColStd,
	60	HArray1OfReal from TColStd,
	61	HArray2OfSurface from TColGeom,
	62	Shape from GeomAbs,
	63	Parametrisation from ShapeExtend
	64
	65	is
	66
	67	Create returns mutable CompositeSurface from ShapeExtend;
	68	---Purpose: Empty constructor.
	69
	70	Create (GridSurf: HArray2OfSurface from TColGeom;
	71	param : Parametrisation from ShapeExtend = ShapeExtend_Natural)
	72	returns mutable CompositeSurface from ShapeExtend;
	73	---Purpose: Initializes by a grid of surfaces (calls Init()).
	74
	75	Create (GridSurf: HArray2OfSurface from TColGeom;
	76	UJoints, VJoints : Array1OfReal from TColStd)
	77	returns mutable CompositeSurface from ShapeExtend;
	78	---Purpose: Initializes by a grid of surfaces (calls Init()).
	79
80	Init (me: mutable; GridSurf: HArray2OfSurface from TColGeom;
81	param : Parametrisation from ShapeExtend = ShapeExtend_Natural)
82	returns Boolean;
83	---Purpose: Initializes by a grid of surfaces.
84	-- All the Surfaces of the grid must have geometrical
85	-- connectivity as stated above.
86	-- If geometrical connectivity is not satisfied, method
87	-- returns False.
88	-- However, class is initialized even in that case.
89	--
90	-- Last parameter defines how global parametrisation
91	-- (joint values) will be computed:
92	-- ShapeExtend_Natural: U1 = u11min, Ui+1 = Ui + (ui1max-ui1min), etc.
93	-- ShapeExtend_Uniform: Ui = i-1, Vj = j-1
94	-- ShapeExtend_Unitary: Ui = (i-1)/Nu, Vi = (j-1)/Nv
95
96	Init (me: mutable; GridSurf: HArray2OfSurface from TColGeom;
97	UJoints, VJoints : Array1OfReal from TColStd)
98	returns Boolean;
99	---Purpose: Initializes by a grid of surfaces with given global
100	-- parametrisation defined by UJoints and VJoints arrays,
101	-- each having langth equal to number of patches in corresponding
102	-- direction + 1. Global joint values should be sorted in
103	-- increasing order.
104	-- All the Surfaces of the grid must have geometrical
105	-- connectivity as stated above.
106	-- If geometrical connectivity is not satisfied, method
107	-- returns False.
108	-- However, class is initialized even in that case.
109
110	NbUPatches (me) returns Integer;
111	---Purpose: Returns number of patches in U direction.
112
113	NbVPatches (me) returns Integer;
114	---Purpose: Returns number of patches in V direction.
115
116	Patch (me; i, j: Integer) returns Surface from Geom;
117	---C++: return const &
118	---Purpose: Returns one surface patch
119
120	Patches (me) returns HArray2OfSurface from TColGeom;
121	---C++: return const &
122	---Purpose: Returns grid of surfaces
123
124	UJointValues (me) returns HArray1OfReal from TColStd;
125	---Purpose: Returns the array of U values corresponding to joint
126	-- points between patches as well as to start and end points,
127	-- which define global parametrisation of the surface
128
129	VJointValues (me) returns HArray1OfReal from TColStd;
130	---Purpose: Returns the array of V values corresponding to joint
131	-- points between patches as well as to start and end points,
132	-- which define global parametrisation of the surface
133
134	UJointValue (me; i: Integer) returns Real;
135	---Purpose: Returns i-th joint value in U direction
136	-- (1-st is global Umin, (NbUPatches()+1)-th is global Umax
137	-- on the composite surface)
138
139	VJointValue (me; j: Integer) returns Real;
140	---Purpose: Returns j-th joint value in V direction
141	-- (1-st is global Vmin, (NbVPatches()+1)-th is global Vmax
142	-- on the composite surface)
143
144	SetUJointValues (me: mutable; UJoints: Array1OfReal from TColStd)
145	returns Boolean;
146	---Purpose: Sets the array of U values corresponding to joint
147	-- points, which define global parametrisation of the surface.
148	-- Number of values in array should be equal to NbUPatches()+1.
149	-- All the values should be sorted in increasing order.
150	-- If this is not satisfied, does nothing and returns False.
151
152	SetVJointValues (me: mutable; VJoints: Array1OfReal from TColStd)
153	returns Boolean;
154	---Purpose: Sets the array of V values corresponding to joint
155	-- points, which define global parametrisation of the surface
156	-- Number of values in array should be equal to NbVPatches()+1.
157	-- All the values should be sorted in increasing order.
158	-- If this is not satisfied, does nothing and returns False.
159
160	SetUFirstValue (me: mutable; UFirst: Real);
161	---Purpose: Changes starting value for global U parametrisation (all
162	-- other joint values are shifted accordingly)
163
164	SetVFirstValue (me: mutable; VFirst: Real);
165	---Purpose: Changes starting value for global V parametrisation (all
166	-- other joint values are shifted accordingly)
167
168	LocateUParameter(me; U: Real) returns Integer;
169	---Purpose: Returns number of col that contains given (global) parameter
170
171	LocateVParameter(me; V: Real) returns Integer;
172	---Purpose: Returns number of row that contains given (global) parameter
173
174	LocateUVPoint(me; pnt: Pnt2d from gp;
175	i : out Integer;
176	j : out Integer);
177	---Purpose: Returns number of row and col of surface that contains
178	-- given point
179
180	Patch(me; U, V: Real) returns Surface from Geom;
181	---C++: return const &
182	---Purpose: Returns one surface patch that contains given (global) parameters
183
184	Patch(me; pnt: Pnt2d from gp) returns Surface from Geom;
185	---C++: return const &
186	---Purpose: Returns one surface patch that contains given point
187
188
189	---Advanced: Work with local parameters on patches
190
191	ULocalToGlobal (me; i, j: Integer; u: Real) returns Real;
192	---Purpose: Converts local parameter u on patch i,j to global parameter U
193
194	VLocalToGlobal (me; i, j: Integer; v: Real) returns Real;
195	---Purpose: Converts local parameter v on patch i,j to global parameter V
196
197	LocalToGlobal (me; i, j: Integer; uv: Pnt2d from gp) returns Pnt2d from gp;
198	---Purpose: Converts local parameters uv on patch i,j to global parameters UV
199
200	UGlobalToLocal (me; i, j: Integer; U: Real) returns Real;
201	---Purpose: Converts global parameter U to local parameter u on patch i,j
202
203	VGlobalToLocal (me; i, j: Integer; V: Real) returns Real;
204	---Purpose: Converts global parameter V to local parameter v on patch i,j
205
206	GlobalToLocal (me; i, j: Integer; UV: Pnt2d from gp) returns Pnt2d from gp;
207	---Purpose: Converts global parameters UV to local parameters uv on patch i,j
208
209	GlobalToLocalTransformation (me; i, j : Integer;
210	uFact: out Real; Trsf: out Trsf2d from gp )
211	returns Boolean;
212	---Purpose: Computes transformation operator and uFactor descrinbing affine
213	-- transformation required to convert global parameters on composite
214	-- surface to local parameters on patch (i,j):
215	-- uv = ( uFactor, 1. ) X Trsf * UV;
216	-- NOTE: Thus Trsf contains shift and scale by V, scale by U is stored in uFact.
217	-- Returns True if transformation is not an identity
218
219
220	---Inherited: methods of Geom_Geometry and Geom_Surface
221
222	Transform (me : mutable; T : Trsf) is redefined;
223	---Purpose: Applies transformation to all the patches
224
225	Copy (me) returns mutable like me is redefined;
226	---Purpose: Returns a copy of the surface
227
228	UReverse (me : mutable) is redefined;
229	---Purpose: NOT IMPLEMENTED (does nothing)
230
231	UReversedParameter (me; U : Real) returns Real is redefined;
232	---Purpose: Returns U
233
234	VReverse (me : mutable) is redefined;
235	---Purpose: NOT IMPLEMENTED (does nothing)
236
237	VReversedParameter (me; V : Real) returns Real is redefined;
238	---Purpose: Returns V
239
240	Bounds(me; U1, U2, V1, V2 : out Real) is redefined;
241	---Purpose: Returns the parametric bounds of grid
242
243	IsUClosed (me) returns Boolean is redefined;
244	---Purpose: Returns True if grid is closed in U direction
245	-- (i.e. connected with Precision::Confusion)
246
247	IsVClosed (me) returns Boolean is redefined;
248	---Purpose: Returns True if grid is closed in V direction
249	-- (i.e. connected with Precision::Confusion)
250
251	IsUPeriodic (me) returns Boolean is redefined;
252	---Purpose: Returns False
253
254	IsVPeriodic (me) returns Boolean is redefined;
255	---Purpose: Returns False
256
257	UIso (me; U : Real) returns mutable Curve is redefined;
258	---Purpose: NOT IMPLEMENTED (returns Null curve)
259
260	VIso (me; V : Real) returns mutable Curve is redefined;
261	---Purpose: NOT IMPLEMENTED (returns Null curve)
262
263
264	Continuity (me) returns Shape from GeomAbs is redefined;
265	---Purpose: returns C0
266
267	IsCNu (me; N : Integer) returns Boolean is redefined;
268	---Purpose: returns True if N <=0
269
270	IsCNv (me; N : Integer) returns Boolean is redefined;
271	---Purpose: returns True if N <=0
272
273	D0 (me; U, V : Real; P : out Pnt) is redefined;
274	---Purpose: Computes the point of parameter U,V on the grid.
275
276	D1 (me; U, V : Real; P : out Pnt; D1U, D1V : out Vec) is redefined;
277	---Purpose: Computes the point P and the first derivatives in the
278	-- directions U and V at this point.
279
280	D2 (me; U, V : Real; P : out Pnt; D1U, D1V, D2U, D2V, D2UV : out Vec) is redefined;
281	---Purpose: Computes the point P, the first and the second derivatives in
282	-- the directions U and V at this point.
283
284	D3 (me; U, V : Real; P : out Pnt;
285	D1U, D1V, D2U, D2V, D2UV, D3U, D3V, D3UUV, D3UVV: out Vec) is redefined;
286	---Purpose: Computes the point P, the first,the second and the third
287	-- derivatives in the directions U and V at this point.
288
289	DN (me; U, V : Real; Nu, Nv : Integer) returns Vec is redefined;
290	---Purpose: Computes the derivative of order Nu in the direction U and Nv
291	-- in the direction V at the point P(U, V).
292
293	Value(me; pnt: Pnt2d from gp) returns Pnt from gp;
294	---Purpose: Computes the point of parameter pnt on the grid.
295
296
297	---Private: internal methods
298
299	ComputeJointValues (me: mutable; param : Parametrisation from ShapeExtend = ShapeExtend_Natural);
300	---Purpose: Computes Joint values according to parameter
301
302	CheckConnectivity (me: mutable; prec: Real) returns Boolean;
303	---Purpose: Checks geometrical connectivity of the patches, including
304	-- closedness (sets fields muUClosed and myVClosed)
305
306	fields
307
308	myPatches : HArray2OfSurface from TColGeom;
309	myUJointValues: HArray1OfReal from TColStd;
310	myVJointValues: HArray1OfReal from TColStd;
311	myUClosed : Boolean; -- closedness (periodicity) measured with Precision::Confusion()
312	myVClosed : Boolean;
313
314	end;
315