source: Sophya/trunk/SophyaLib/SkyMap/longlat.cc@ 2479

Last change on this file since 2479 was 764, checked in by ansari, 26 years ago

Reorganisation - Creation du module SkyMap (Loacl/Spherical maps ...) - Reza 2/3/2000

File size: 1.6 KB
Line 
1#include "longlat.h"
2//++
3// Class LongLat
4//
5// include longlat.h
6//
7// translation from coordinates (longitude, latitude)
8// to theta,phi
9//
10// longitude=phi
11//
12// latitude=Pi/2-theta
13//
14//--
15//++
16// Titre Constructors
17//--
18//++
19LongLat::LongLat()
20//
21//--
22{
23 _lon=0.;
24 _lat=0.;
25}
26//++
27LongLat::LongLat(double longitude, double latitude)
28//
29//--
30{
31 _lon=mod(longitude,pi2);
32 if( latitude == pi_over_2 ) _lat=latitude;
33 else _lat=mod(latitude+pi_over_2,M_PI)-pi_over_2; // dans [-Pi/2,Pi/2]
34}
35//++
36LongLat::LongLat(double x, double y, double z)
37//
38//--
39{
40 double norm=sqrt(x*x+y*y+z*z);
41 double theta;
42 if( norm != 0. )
43 {
44 theta=acos(z/norm); // dans [0,Pi]
45 if( mod(theta,M_PI) == 0. ) _lon=0.; // on est sur +-Oz, le vecteur z est en phi=0
46 // else _lon=acos(x/sin(theta)/norm)+M_PI*(y<0);
47 else _lon=scangle(y/sin(theta)/norm,x/sin(theta)/norm);
48 }
49 else // vecteur nul
50 {
51 theta=0.;
52 _lon=0.;
53 }
54 _lat=pi_over_2-theta;
55}
56//++
57// Titre Public Methods
58//--
59//++
60void LongLat::Set(double longitude, double latitude)
61//
62//--
63{
64 _lon=mod(longitude,pi2);
65 if( latitude == pi_over_2 ) _lat=latitude;
66 else _lat=mod(latitude+pi_over_2,M_PI)-pi_over_2; // dans [-Pi/2,Pi/2]
67}
68//++
69void LongLat::Print(ostream& os) const
70//
71//--
72{
73 os << "LongLat : longitude = " << _lon << " phi = " << this->Phi() << endl;
74 os << "LongLat : latitude = " << _lat << " theta = " << this->Theta() << endl;
75}
76//++
77//
78// double Longitude() const
79// double Phi() const
80// double Latitude()
81// double Theta() const
82//--
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