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| author | Frank Warmerdam <warmerdam@pobox.com> | 1999-03-18 16:34:52 +0000 |
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| committer | Frank Warmerdam <warmerdam@pobox.com> | 1999-03-18 16:34:52 +0000 |
| commit | 565a4bd035b9d4a83955808efef20f1d8dfa24cf (patch) | |
| tree | 75785fc897708023f1ccdaf40079afcbaaf0fd3a /src/PJ_bacon.c | |
| download | PROJ-565a4bd035b9d4a83955808efef20f1d8dfa24cf.tar.gz PROJ-565a4bd035b9d4a83955808efef20f1d8dfa24cf.zip | |
New
git-svn-id: http://svn.osgeo.org/metacrs/proj/trunk@776 4e78687f-474d-0410-85f9-8d5e500ac6b2
Diffstat (limited to 'src/PJ_bacon.c')
| -rw-r--r-- | src/PJ_bacon.c | 44 |
1 files changed, 44 insertions, 0 deletions
diff --git a/src/PJ_bacon.c b/src/PJ_bacon.c new file mode 100644 index 00000000..ab785d2d --- /dev/null +++ b/src/PJ_bacon.c @@ -0,0 +1,44 @@ +#ifndef lint +static const char SCCSID[]="@(#)PJ_bacon.c 4.1 94/02/15 GIE REL"; +#endif +# define HLFPI2 2.46740110027233965467 +# define EPS 1e-10 +#define PROJ_PARMS__ \ + int bacn; \ + int ortl; +#define PJ_LIB__ +#include <projects.h> +PROJ_HEAD(apian, "Apian Globular I") "\n\tMisc Sph, no inv."; +PROJ_HEAD(ortel, "Ortelius Oval") "\n\tMisc Sph, no inv."; +PROJ_HEAD(bacon, "Bacon Globular") "\n\tMisc Sph, no inv."; +FORWARD(s_forward); /* spheroid */ + double ax, f; + + xy.y = P->bacn ? HALFPI * sin(lp.phi) : lp.phi; + if ((ax = fabs(lp.lam)) >= EPS) { + if (P->ortl && ax >= HALFPI) + xy.x = sqrt(HLFPI2 - lp.phi * lp.phi + EPS) + ax - HALFPI; + else { + f = 0.5 * (HLFPI2 / ax + ax); + xy.x = ax - f + sqrt(f * f - xy.y * xy.y); + } + if (lp.lam < 0.) xy.x = - xy.x; + } else + xy.x = 0.; + return (xy); +} +FREEUP; if (P) pj_dalloc(P); } +ENTRY0(bacon) + P->bacn = 1; + P->ortl = 0; + P->es = 0.; P->fwd = s_forward; +ENDENTRY(P) +ENTRY0(apian) + P->bacn = P->ortl = 0; + P->es = 0.; P->fwd = s_forward; +ENDENTRY(P) +ENTRY0(ortel) + P->bacn = 0; + P->ortl = 1; + P->es = 0.; P->fwd = s_forward; +ENDENTRY(P) |