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1 | -- Created on: 1997-02-18 |
2 | -- Created by: Stagiaire Francois DUMONT |
3 | -- Copyright (c) 1997-1999 Matra Datavision |
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4 | -- Copyright (c) 1999-2014 OPEN CASCADE SAS |
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5 | -- |
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6 | -- This file is part of Open CASCADE Technology software library. |
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7 | -- |
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8 | -- This library is free software; you can redistribute it and/or modify it under |
9 | -- the terms of the GNU Lesser General Public License version 2.1 as published |
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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. |
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13 | -- |
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14 | -- Alternatively, this file may be used under the terms of Open CASCADE |
15 | -- commercial license or contractual agreement. |
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16 | |
17 | package Hermit |
18 | |
19 | ---Purpose: This is used to reparameterize Rational BSpline |
20 | -- Curves so that we can concatenate them later to |
21 | -- build C1 Curves It builds and 1D-reparameterizing |
22 | -- function starting from an Hermite interpolation and |
23 | -- adding knots and modifying poles of the 1D BSpline |
24 | -- obtained that way. The goal is to build a(u) so that |
25 | -- if we consider a BSpline curve |
26 | -- N(u) |
27 | -- f(u) = ----- |
28 | -- D(u) |
29 | -- |
30 | -- the function a(u)D(u) has value 1 at the umin and umax |
31 | -- and has 0.0e0 derivative value a umin and umax. |
32 | -- The details of the computation occuring in this package |
33 | -- can be found by reading : |
34 | -- " Etude sur la concatenation de NURBS en vue du |
35 | -- balayage de surfaces" PFE n S85 Ensam Lille |
36 | uses |
37 | Geom, |
38 | Geom2d, |
39 | TColStd, |
40 | TColgp |
41 | |
42 | is |
43 | |
44 | Solution( BS : BSplineCurve from Geom; |
45 | TolPoles : in Real from Standard=0.000001; |
46 | TolKnots : in Real from Standard=0.000001) |
47 | ---Purpose:returns the correct spline a(u) which will |
48 | -- be multiplicated with BS later. |
49 | returns BSplineCurve from Geom2d; |
50 | |
51 | Solution( BS : BSplineCurve from Geom2d; |
52 | TolPoles : in Real from Standard=0.000001; |
53 | TolKnots : in Real from Standard=0.000001) |
54 | ---Purpose:returns the correct spline a(u) which will |
55 | -- be multiplicated with BS later. |
56 | returns BSplineCurve from Geom2d; |
57 | |
58 | Solutionbis( BS : BSplineCurve from Geom; |
59 | Knotmin : out Real from Standard; |
60 | Knotmax : out Real from Standard; |
61 | TolPoles : in Real from Standard=0.000001; |
62 | TolKnots : in Real from Standard=0.000001); |
63 | ---Purpose:returns the knots to insert to a(u) to |
64 | -- stay with a constant sign and in the |
65 | -- tolerances. |
66 | |
67 | end Hermit; |
68 | |
69 | |