0024510: Remove unused local variables
[occt.git] / src / GccAna / GccAna_Circ2d2TanRad_3.cxx
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b311480e 1// Created on: 1991-09-24
2// Created by: Joelle CHAUVET
3// Copyright (c) 1991-1999 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//
973c2be1 8// This library is free software; you can redistribute it and / or modify it
9// under the terms of the GNU Lesser General Public version 2.1 as published
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
15// commercial license or contractual agreement.
b311480e 16
7fd59977 17// Modified: Thu Jun 18 15:45:00 1998
7fd59977 18// PRO10310 : cas ou le point est sur la droite
19
20#include <GccAna_Circ2d2TanRad.jxx>
21
22#include <ElCLib.hxx>
23#include <gp_Circ2d.hxx>
24#include <gp_Lin2d.hxx>
25#include <gp_Ax2d.hxx>
26#include <IntAna2d_AnaIntersection.hxx>
27#include <IntAna2d_IntPoint.hxx>
28#include <TColStd_Array1OfReal.hxx>
29#include <Standard_NegativeValue.hxx>
30#include <GccEnt_BadQualifier.hxx>
31
0d969553 32// circular tangent to a line and a point and a given radius
7fd59977 33//=============================================================
34//========================================================================
0d969553
Y
35// Initialize WellDone to false. +
36// Return line L1. +
37// Leave with error if the construction is impossible. +
38// Create parallel to L1 in the proper direction. +
39// Create the circle with center at Point1 of radius Radius. +
40// Intersect the parallel and the circle. +
41// ==> The center point of the solution. +
42// Create the solution to be added to already found solutions. +
43// Fill the fields. +
7fd59977 44//========================================================================
45
46GccAna_Circ2d2TanRad::
47 GccAna_Circ2d2TanRad (const GccEnt_QualifiedLin& Qualified1 ,
48 const gp_Pnt2d& Point2 ,
49 const Standard_Real Radius ,
50 const Standard_Real Tolerance ):
51 qualifier1(1,2) ,
52 qualifier2(1,2),
53 TheSame1(1,2) ,
54 TheSame2(1,2) ,
55 cirsol(1,2) ,
56 pnttg1sol(1,2) ,
57 pnttg2sol(1,2) ,
58 par1sol(1,2) ,
59 par2sol(1,2) ,
60 pararg1(1,2) ,
61 pararg2(1,2)
62{
63
64 gp_Dir2d dirx(1.0,0.0);
65 Standard_Real Tol = Abs(Tolerance);
66 NbrSol = 0;
67 WellDone = Standard_False;
68 if (!(Qualified1.IsEnclosed() || Qualified1.IsOutside() ||
69 Qualified1.IsUnqualified())) {
70 GccEnt_BadQualifier::Raise();
71 return;
72 }
73 Standard_Integer nbsol = 0;
74 Standard_Integer nbcote=0;
75 TColStd_Array1OfReal cote(1,2);
76 gp_Lin2d L1 = Qualified1.Qualified();
77 Standard_Real displ1 = L1.Distance(Point2);
78 Standard_Real xdir = (L1.Direction()).X();
79 Standard_Real ydir = (L1.Direction()).Y();
80 Standard_Real lxloc = (L1.Location()).X();
81 Standard_Real lyloc = (L1.Location()).Y();
82 gp_Pnt2d origin1(lxloc,lyloc);
83 gp_Dir2d normL1(-ydir,xdir);
84 Standard_Real cxloc = Point2.X();
85 Standard_Real cyloc = Point2.Y();
86
87 if (Radius < 0.0) { Standard_NegativeValue::Raise(); }
88
89 else {
90 if ( displ1-Radius*2.0 > Tol) { WellDone = Standard_True; }
91 else if (Qualified1.IsEnclosed()) {
92// =================================
93 if ((-ydir*(cxloc-lxloc)+xdir*(cyloc-lyloc)<0.0)) {
94 WellDone = Standard_True;
95 }
96 else {
97 if ( displ1-Radius*2.0 > 0.0) {
98 nbsol = 2;
99 NbrSol = 1;
100 nbcote = 1;
101 cote(1) = 1.0;
102 }
103 else {
104 nbsol = 1;
105 nbcote = 1;
106 cote(1) = 1.0;
107 }
108 }
109 }
110 else if (Qualified1.IsOutside()) {
111// ================================
112 if ((-ydir*(cxloc-lxloc)+xdir*(cyloc-lyloc)>0.0)) {
113 WellDone = Standard_True;
114 }
115 else {
116 if ( displ1-Radius*2.0 > 0.0) {
117 nbsol = 2;
118 nbcote = 1;
119 cote(1) = -1.0;
120 }
121 else {
122 nbsol = 1;
123 nbcote = 1;
124 cote(1) = -1.0;
125 }
126 }
127 }
128 else if (Qualified1.IsUnqualified()) {
129// ====================================
130 if ( displ1-Radius*2.0 > 0.0) {
131 if ((-ydir*(cxloc-lxloc)+xdir*(cyloc-lyloc)>0.0)) {
132 nbsol = 2;
133 nbcote = 1;
134 cote(1) = 1.0;
135 }
136 else if ((-ydir*(cxloc-lxloc)+xdir*(cyloc-lyloc)<0.0)) {
137 nbsol = 2;
138 nbcote = 1;
139 cote(1) = -1.0;
140 }
141 }
142 else {
143 nbsol = 1;
144 nbcote = 2;
145 cote(1) = 1.0;
146 cote(2) = -1.0;
147 }
148 }
149
150 if (nbsol == 1) {
151 if (displ1<1.e-10) {
0d969553
Y
152 // particular case when Point2 is on the line
153 // construct two solutions directly
7fd59977 154 for (Standard_Integer jcote = 1 ; jcote <= nbcote ; jcote++) {
155 NbrSol++;
156 gp_Pnt2d Center(cxloc-cote(jcote)*ydir*Radius,
157 cyloc+cote(jcote)*xdir*Radius);
158 cirsol(NbrSol) = gp_Circ2d(gp_Ax2d(Center,dirx),Radius);
159// =======================================================
160 qualifier2(NbrSol) = GccEnt_noqualifier;
161 if (!Qualified1.IsUnqualified()) {
162 qualifier1(NbrSol) = Qualified1.Qualifier();
163 }
164 else if (cote(jcote) > 0.0) {
165 qualifier1(NbrSol) = GccEnt_outside;
166 }
167 else {
168 qualifier1(NbrSol) = GccEnt_enclosed;
169 }
170 TheSame1(NbrSol) = 0;
171 TheSame2(NbrSol) = 0;
172 pnttg1sol(NbrSol) = Point2;
173 pnttg2sol(NbrSol) = Point2;
174 }
175 WellDone = Standard_True;
176 }
177 else {
178 gp_Circ2d cirint(gp_Ax2d(Point2,dirx),Radius);
179 for (Standard_Integer jcote = 1 ; jcote <= nbcote ; jcote++) {
180 gp_Lin2d linint(gp_Pnt2d(lxloc-cote(jcote)*ydir*Radius,
181 lyloc+cote(jcote)*xdir*Radius),
182 L1.Direction());
183 IntAna2d_AnaIntersection Intp(linint,cirint);
184 if (Intp.IsDone()) {
185 if (!Intp.IsEmpty()) {
186 for (Standard_Integer i = 1 ; i <= Intp.NbPoints() && NbrSol<2; i++) {
187 NbrSol++;
188 gp_Pnt2d Center(Intp.Point(i).Value());
189 cirsol(NbrSol) = gp_Circ2d(gp_Ax2d(Center,dirx),Radius);
190 // =======================================================
191 gp_Dir2d dc1(origin1.XY()-Center.XY());
192 qualifier2(NbrSol) = GccEnt_noqualifier;
193 if (!Qualified1.IsUnqualified()) {
194 qualifier1(NbrSol) = Qualified1.Qualifier();
195 }
196 else if (dc1.Dot(normL1) > 0.0) {
197 qualifier1(NbrSol) = GccEnt_outside;
198 }
199 else { qualifier1(NbrSol) = GccEnt_enclosed; }
200 TheSame1(NbrSol) = 0;
201 TheSame2(NbrSol) = 0;
202 pnttg1sol(NbrSol)=gp_Pnt2d(Center.XY()+
203 cote(jcote)*Radius*gp_XY(ydir,-xdir));
204 pnttg2sol(NbrSol) = Point2;
205 }
206 }
207 WellDone = Standard_True;
208 }
209 }
210 }
211 }
212
213 else if (nbsol == 2) {
214 gp_Pnt2d Center(Point2.XY()+cote(1)*Radius*gp_XY(-ydir,xdir));
215 WellDone = Standard_True;
216 NbrSol = 1;
217 cirsol(1) = gp_Circ2d(gp_Ax2d(Center,dirx),Radius);
218// ==================================================
219 qualifier2(1) = GccEnt_noqualifier;
220 TheSame1(1) = 0;
221 TheSame2(1) = 0;
222 pnttg1sol(1)=gp_Pnt2d(Center.XY()+cote(1)*Radius*gp_XY(ydir,-xdir));
223 pnttg2sol(1) = Point2;
224 }
225 }
226
227 for (Standard_Integer i = 1 ; i <= NbrSol ; i++) {
228 par1sol(i)=ElCLib::Parameter(cirsol(i),pnttg1sol(i));
229 pararg1(i)=ElCLib::Parameter(L1,pnttg1sol(i));
230 par2sol(i)=ElCLib::Parameter(cirsol(i),pnttg2sol(i));
231 pararg2(i)=0.;
232 }
233
234}
235
236
237
238