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b311480e | 1 | // Copyright (c) 1995-1999 Matra Datavision |
973c2be1 | 2 | // Copyright (c) 1999-2014 OPEN CASCADE SAS |
b311480e | 3 | // |
973c2be1 | 4 | // This file is part of Open CASCADE Technology software library. |
b311480e | 5 | // |
d5f74e42 | 6 | // This library is free software; you can redistribute it and/or modify it under |
7 | // the terms of the GNU Lesser General Public License version 2.1 as published | |
973c2be1 | 8 | // by the Free Software Foundation, with special exception defined in the file |
9 | // OCCT_LGPL_EXCEPTION.txt. Consult the file LICENSE_LGPL_21.txt included in OCCT | |
10 | // distribution for complete text of the license and disclaimer of any warranty. | |
b311480e | 11 | // |
973c2be1 | 12 | // Alternatively, this file may be used under the terms of Open CASCADE |
13 | // commercial license or contractual agreement. | |
7fd59977 | 14 | |
7fd59977 | 15 | |
16 | #include <ElCLib.hxx> | |
42cf5bc1 | 17 | #include <GccAna_Circ2dTanOnRad.hxx> |
18 | #include <GccEnt_BadQualifier.hxx> | |
19 | #include <GccEnt_QualifiedCirc.hxx> | |
20 | #include <GccEnt_QualifiedLin.hxx> | |
21 | #include <gp_Circ2d.hxx> | |
22 | #include <gp_Dir2d.hxx> | |
23 | #include <gp_Lin2d.hxx> | |
24 | #include <gp_Pnt2d.hxx> | |
7fd59977 | 25 | #include <IntAna2d_AnaIntersection.hxx> |
26 | #include <IntAna2d_IntPoint.hxx> | |
27 | #include <Standard_NegativeValue.hxx> | |
28 | #include <Standard_OutOfRange.hxx> | |
42cf5bc1 | 29 | #include <StdFail_NotDone.hxx> |
7fd59977 | 30 | |
31 | //========================================================================= | |
0d969553 Y |
32 | // Circle tangent to straight line Qualified1 (L1). + |
33 | // center on circle OnCirc. + | |
34 | // with radius Radius. + | |
7fd59977 | 35 | // + |
0d969553 Y |
36 | // Initialize table of solutions cirsol and all fields. + |
37 | // Eliminate cases not being the solution. + | |
38 | // Create parallel line(s) to L1 in the required direction(s). + | |
39 | // Intersect parallel line(s) with OnCirc and obtain + | |
40 | // center points of found solutions. + | |
41 | // Create solutions cirsol. + | |
7fd59977 | 42 | //========================================================================= |
7fd59977 | 43 | GccAna_Circ2dTanOnRad:: |
44 | GccAna_Circ2dTanOnRad (const GccEnt_QualifiedLin& Qualified1, | |
45 | const gp_Circ2d& OnCirc , | |
46 | const Standard_Real Radius , | |
47 | const Standard_Real Tolerance ): | |
48 | ||
49 | //========================================================================= | |
0d969553 | 50 | // Initialization of fields. + |
7fd59977 | 51 | //========================================================================= |
52 | ||
53 | cirsol(1,4) , | |
54 | qualifier1(1,4) , | |
55 | TheSame1(1,4) , | |
56 | pnttg1sol(1,4), | |
57 | pntcen3(1,4) , | |
58 | par1sol(1,4) , | |
59 | pararg1(1,4) , | |
60 | parcen3(1,4) | |
61 | { | |
62 | ||
63 | TheSame1.Init(0); | |
64 | gp_Dir2d dirx(1.0,0.0); | |
65 | Standard_Real Tol = Abs(Tolerance); | |
66 | WellDone = Standard_False; | |
67 | NbrSol = 0; | |
68 | if (!(Qualified1.IsEnclosed() || | |
69 | Qualified1.IsOutside() || Qualified1.IsUnqualified())) { | |
9775fa61 | 70 | throw GccEnt_BadQualifier(); |
7fd59977 | 71 | return; |
72 | } | |
73 | ||
74 | //========================================================================= | |
0d969553 | 75 | // Initialisation of various variables. + |
7fd59977 | 76 | //========================================================================= |
77 | ||
78 | Standard_Integer nbsol = 0; | |
79 | Standard_Integer sign = 0; | |
80 | gp_Lin2d L1 = Qualified1.Qualified(); | |
81 | gp_Pnt2d origin1(L1.Location()); | |
82 | gp_Dir2d dir1(L1.Direction()); | |
83 | gp_Dir2d normL1(-dir1.Y(),dir1.X()); | |
84 | Standard_Real dist1 = L1.Distance(OnCirc.Location())-OnCirc.Radius(); | |
85 | Standard_Real dist2 = L1.Distance(OnCirc.Location())+OnCirc.Radius(); | |
86 | ||
87 | //========================================================================= | |
0d969553 | 88 | // Processing. + |
7fd59977 | 89 | //========================================================================= |
90 | ||
9775fa61 | 91 | if (Radius < 0.0) { throw Standard_NegativeValue(); } |
7fd59977 | 92 | else { |
93 | L1 = Qualified1.Qualified(); | |
94 | if ((dist1-Radius>Tol) || (Tol<Radius-dist2)) { WellDone=Standard_True; } | |
95 | else { | |
96 | ||
0d969553 | 97 | // to modify later |
7fd59977 | 98 | |
99 | if (dist1-Radius > 0.0) { dist1 = Radius; } | |
100 | else if (dist2-Radius < 0.0) { dist2 = Radius; } | |
101 | ||
102 | if (Qualified1.IsEnclosed()) { | |
103 | // ============================ | |
104 | nbsol = 1; | |
105 | sign = -1; | |
106 | } | |
107 | else if (Qualified1.IsOutside()) { | |
108 | // ================================ | |
109 | nbsol = 1; | |
110 | sign = 1; | |
111 | } | |
112 | else { | |
113 | // ==== | |
114 | nbsol = 2; | |
115 | sign = 1; | |
116 | } | |
117 | for (Standard_Integer j = 1 ; j <= nbsol ;j++) { | |
118 | sign = -sign; | |
119 | gp_Lin2d L(gp_Pnt2d(origin1.X()-sign*Radius*dir1.Y(), | |
120 | origin1.Y()+sign*Radius*dir1.X()),dir1); | |
121 | IntAna2d_AnaIntersection Intp(L,OnCirc); | |
122 | if (Intp.IsDone()) { | |
123 | if (!Intp.IsEmpty()) { | |
124 | for (Standard_Integer i = 1 ; i <= Intp.NbPoints() ; i++) { | |
125 | NbrSol++; | |
126 | gp_Pnt2d Center(Intp.Point(i).Value()); | |
127 | gp_Ax2d axe(Center,dirx); | |
128 | cirsol(NbrSol) = gp_Circ2d(axe,Radius); | |
129 | // ====================================== | |
130 | gp_Dir2d dc1(origin1.XY()-Center.XY()); | |
131 | sign = (Standard_Integer) dc1.Dot(normL1); | |
132 | if (!Qualified1.IsUnqualified()) { | |
133 | qualifier1(NbrSol) = Qualified1.Qualifier(); | |
134 | } | |
135 | else if (dc1.Dot(normL1) > 0.0) { | |
136 | qualifier1(NbrSol) = GccEnt_outside; | |
137 | } | |
138 | else { qualifier1(NbrSol) = GccEnt_enclosed; } | |
139 | pntcen3(NbrSol) = cirsol(NbrSol).Location(); | |
140 | pnttg1sol(NbrSol) = gp_Pnt2d(pntcen3(NbrSol).XY()+ | |
141 | gp_XY(sign*Radius*dir1.Y(), | |
142 | -sign*Radius*dir1.X())); | |
143 | pararg1(NbrSol)=ElCLib::Parameter(L1,pnttg1sol(NbrSol)); | |
144 | par1sol(NbrSol)=ElCLib::Parameter(cirsol(NbrSol), | |
145 | pnttg1sol(NbrSol)); | |
146 | parcen3(NbrSol)=ElCLib::Parameter(OnCirc,pntcen3(NbrSol)); | |
147 | } | |
148 | } | |
149 | WellDone = Standard_True; | |
150 | } | |
151 | } | |
152 | } | |
153 | } | |
154 | } | |
155 | ||
156 | ||
157 |