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1 | -- Created on: 1991-02-21 |
2 | -- Created by: Isabelle GRIGNON |
3 | -- Copyright (c) 1991-1999 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 | class ExtPElC from Extrema |
24 | ---Purpose: It calculates all the distances between a point |
25 | -- and an elementary curve. |
26 | -- These distances can be minimum or maximum. |
27 | |
28 | uses POnCurv from Extrema, |
29 | Lin from gp, |
30 | Circ from gp, |
31 | Elips from gp, |
32 | Hypr from gp, |
33 | Parab from gp, |
34 | Pnt from gp |
35 | |
36 | raises NotDone from StdFail, |
37 | OutOfRange from Standard |
38 | |
39 | is |
40 | Create returns ExtPElC; |
41 | |
42 | Create (P: Pnt; C: Lin; Tol: Real; Uinf,Usup: Real) |
43 | returns ExtPElC; |
44 | ---Purpose: Calculates the extremum distance between the |
45 | -- point P and the segment [Uinf,Usup] of the line C. |
46 | |
47 | Perform(me: in out; P: Pnt; C: Lin; Tol: Real; Uinf,Usup: Real) |
48 | is static; |
49 | |
50 | |
51 | Create (P: Pnt; C: Circ; Tol: Real; Uinf,Usup: Real) |
52 | returns ExtPElC; |
53 | ---Purpose: Calculates the 2 extremum distances between the |
54 | -- point P and the segment [Uinf,Usup] of the circle C. |
55 | -- Tol is used to determine |
56 | -- if P is on the axis of the circle or |
57 | -- if an extremum is on an endpoint of the segment. |
58 | -- If P is on the axis of the circle, |
59 | -- there are infinite solution then IsDone(me)=False. |
60 | -- The conditions on the Uinf and Usup are: |
61 | -- 0. <= Uinf <= 2.*PI and Usup > Uinf. |
62 | -- If Usup > Uinf + 2.*PI, then only the solutions in |
63 | -- the range [Uinf,Uinf+2.*PI[ are computed. |
64 | |
65 | |
66 | Perform(me: in out; P: Pnt; C: Circ; Tol: Real; Uinf,Usup: Real) |
67 | is static; |
68 | |
69 | Create (P: Pnt; C: Elips; Tol: Real; Uinf,Usup: Real) |
70 | returns ExtPElC; |
71 | ---Purpose: Calculates the 4 extremum distances between the |
72 | -- point P and the segment [Uinf,Usup] of the elipse C. |
73 | -- Tol is used to determine |
74 | -- if the point is on the axis of the elipse and |
75 | -- if the major radius is equal to the minor radius or |
76 | -- if an extremum is on an endpoint of the segment. |
77 | -- If P is on the axis of the elipse, |
78 | -- there are infinite solution then IsDone(me)=False. |
79 | -- The conditions on the Uinf and Usup are: |
80 | -- 0. <= Uinf <= 2.*PI and Usup > Uinf. |
81 | -- If Usup > Uinf + 2.*PI, then only the solutions in |
82 | -- the range [Uinf,Uinf+2.*PI[ are computed. |
83 | |
84 | |
85 | Perform(me: in out; P: Pnt; C: Elips; Tol: Real; Uinf,Usup: Real) |
86 | is static; |
87 | |
88 | Create (P: Pnt; C: Hypr; Tol: Real; Uinf,Usup: Real) |
89 | returns ExtPElC; |
90 | ---Purpose: Calculates the extremum distances between the |
91 | -- point P and the segment [Uinf,Usup] of the hyperbola |
92 | -- C. |
93 | -- Tol is used to determine if two solutions u and v |
94 | -- are identical; the condition is: |
95 | -- dist(C(u),C(v)) < Tol. |
96 | |
97 | Perform(me: in out; P: Pnt; C: Hypr; Tol: Real; Uinf,Usup: Real) |
98 | is static; |
99 | |
100 | Create (P: Pnt; C: Parab; Tol: Real; Uinf,Usup: Real) |
101 | returns ExtPElC; |
102 | ---Purpose: Calculates the 4 extremum distances between the |
103 | -- point P and the segment [Uinf,Usup] of the parabola |
104 | -- C. |
105 | -- Tol is used to determine if two solutions u and v |
106 | -- are identical; the condition is: |
107 | -- dist(C(u),C(v)) < Tol. |
108 | |
109 | Perform(me: in out; P: Pnt; C: Parab; Tol: Real; Uinf,Usup: Real) |
110 | is static; |
111 | |
112 | |
113 | IsDone (me) returns Boolean |
114 | ---Purpose: True if the distances are found. |
115 | is static; |
116 | |
117 | NbExt (me) returns Integer |
118 | ---Purpose: Returns the number of extremum distances. |
119 | raises NotDone from StdFail |
120 | -- if IsDone(me)=False. |
121 | is static; |
122 | |
123 | SquareDistance (me; N: Integer) returns Real |
124 | ---Purpose: Returns the value of the Nth extremum square distance. |
125 | raises NotDone from StdFail, |
126 | -- if IsDone(me)=False. |
127 | OutOfRange |
128 | -- if N < 1 or N > NbPoints(me). |
129 | is static; |
130 | |
131 | IsMin (me; N: Integer) returns Boolean |
132 | ---Purpose: Returns True if the Nth extremum distance is a |
133 | -- minimum. |
134 | raises NotDone from StdFail, |
135 | -- if IsDone(me)=False. |
136 | OutOfRange |
137 | -- if N < 1 or N > NbPoints(me). |
138 | is static; |
139 | |
140 | Point (me; N: Integer) returns POnCurv |
141 | ---Purpose: Returns the point of the Nth extremum distance. |
142 | raises NotDone from StdFail, |
143 | -- if IsDone(me)=False. |
144 | OutOfRange |
145 | -- if N < 1 or N > NbPoints(me). |
146 | is static; |
147 | |
148 | fields |
149 | myDone : Boolean; |
150 | myNbExt: Integer; |
151 | mySqDist: Real [4]; |
152 | myIsMin: Boolean [4]; |
153 | myPoint: POnCurv from Extrema [4]; |
154 | |
155 | end ExtPElC; |