?? pj_bacon.c
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#ifndef lintstatic 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)?? 快捷鍵說明
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