b311480e |
1 | -- Created on: 1992-03-09 |
2 | -- Created by: Isabelle GRIGNON |
3 | -- Copyright (c) 1992-1999 Matra Datavision |
4 | -- Copyright (c) 1999-2012 OPEN CASCADE SAS |
5 | -- |
6 | -- The content of this file is subject to the Open CASCADE Technology Public |
7 | -- License Version 6.5 (the "License"). You may not use the content of this file |
8 | -- except in compliance with the License. Please obtain a copy of the License |
9 | -- at http://www.opencascade.org and read it completely before using this file. |
10 | -- |
11 | -- The Initial Developer of the Original Code is Open CASCADE S.A.S., having its |
12 | -- main offices at: 1, place des Freres Montgolfier, 78280 Guyancourt, France. |
13 | -- |
14 | -- The Original Code and all software distributed under the License is |
15 | -- distributed on an "AS IS" basis, without warranty of any kind, and the |
16 | -- Initial Developer hereby disclaims all such warranties, including without |
17 | -- limitation, any warranties of merchantability, fitness for a particular |
18 | -- purpose or non-infringement. Please see the License for the specific terms |
19 | -- and conditions governing the rights and limitations under the License. |
20 | |
7fd59977 |
21 | |
22 | |
23 | deferred generic class PathPointTool from IntWalk |
24 | (PathPoint as any) |
25 | |
26 | ---Purpose: Template class to describe the necessary ressources |
27 | -- for a point used as a starting point for a marching |
28 | -- algorithm. |
29 | -- The 'marching algorithm' determines the intersection |
30 | -- between an implicit surface and a parametrized surface. |
31 | -- these points are necessary on an arc of the surface |
32 | |
33 | uses Pnt from gp, |
34 | Vec from gp, |
35 | Dir2d from gp |
36 | |
37 | raises OutOfRange from Standard, |
38 | UndefinedDerivative from StdFail |
39 | |
40 | is |
41 | |
42 | Value3d(myclass; PStart: PathPoint) |
43 | |
44 | ---Purpose: Returns the 3d coordinates of the starting point. |
45 | |
46 | returns Pnt from gp; |
47 | |
48 | |
49 | Value2d(myclass; PStart: PathPoint; U, V: out Real from Standard); |
50 | |
51 | ---Purpose: Returns the <U, V> parameters which are associated |
52 | -- with <P> |
53 | -- it's the parameters which start the marching algorithm |
54 | |
55 | |
56 | IsPassingPnt(myclass; PStart: PathPoint) |
57 | |
58 | ---Purpose: Returns True if the point is a point on a non-oriented |
59 | -- arc, which means that the intersection line does not |
60 | -- stop at such a point but just go through such a point. |
61 | -- IsPassingPnt is True when IsOnArc is True |
62 | |
63 | returns Boolean from Standard; |
64 | |
65 | |
66 | IsTangent(myclass; PStart: PathPoint ) |
67 | |
68 | ---Purpose: Returns True if the surfaces are tangent at this point. |
69 | -- IsTangent can be True when IsOnArc is True |
70 | -- if IsPassingPnt is True and IsTangent is True,this point |
71 | -- is a stopped point. |
72 | |
73 | returns Boolean from Standard; |
74 | |
75 | |
76 | Direction3d(myclass; PStart: PathPoint) |
77 | |
78 | ---Purpose: returns the tangent at the intersection in 3d space |
79 | -- associated to <P> |
80 | -- an exception is raised if IsTangent is true. |
81 | |
82 | returns Vec from gp |
83 | |
84 | raises UndefinedDerivative from StdFail; |
85 | |
86 | |
87 | Direction2d(myclass; PStart: PathPoint) |
88 | |
89 | ---Purpose: returns the tangent at the intersection in the |
90 | -- parametric space of the parametrized surface.This tangent |
91 | -- is associated to the value2d |
92 | -- la tangente a un sens signifiant (indique le sens de chemin |
93 | -- ement) |
94 | -- an exception is raised if IsTangent is true. |
95 | |
96 | returns Dir2d from gp |
97 | |
98 | raises UndefinedDerivative from StdFail; |
99 | |
100 | |
101 | Multiplicity(myclass; PStart: PathPoint) |
102 | |
103 | ---Purpose: Returns the multiplicity of the point i-e |
104 | -- the number of auxillar parameters associated to the |
105 | -- point which the principal parameters are given by Value2d |
106 | |
107 | returns Integer from Standard; |
108 | |
109 | |
110 | Parameters(myclass; PStart: PathPoint; |
111 | Mult: Integer from Standard; |
112 | U, V: out Real from Standard) |
113 | |
114 | ---Purpose: Parametric coordinates associated to the multiplicity. |
115 | -- An exception is raised if Mult<=0 or Mult>multiplicity. |
116 | |
117 | raises OutOfRange from Standard; |
118 | |
119 | |
120 | end PathPointTool; |
121 | |