svn-gvsig-desktop / tags / v1_10_0_Build_1257 / libraries / libjni-proj4 / src / PJ_nocol.c @ 42039
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#ifndef lint
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static const char SCCSID[]="@(#)PJ_nocol.c 4.1 94/02/15 GIE REL"; |
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#endif
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#define PJ_LIB__
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#include <projects.h> |
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PROJ_HEAD(nicol, "Nicolosi Globular") "\n\tMisc Sph, no inv."; |
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#define EPS 1e-10 |
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FORWARD(s_forward); /* spheroid */
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if (fabs(lp.lam) < EPS) {
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xy.x = 0;
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xy.y = lp.phi; |
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} else if (fabs(lp.phi) < EPS) { |
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xy.x = lp.lam; |
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xy.y = 0.;
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} else if (fabs(fabs(lp.lam) - HALFPI) < EPS) { |
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xy.x = lp.lam * cos(lp.phi); |
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xy.y = HALFPI * sin(lp.phi); |
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} else if (fabs(fabs(lp.phi) - HALFPI) < EPS) { |
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xy.x = 0;
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xy.y = lp.phi; |
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} else {
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double tb, c, d, m, n, r2, sp;
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tb = HALFPI / lp.lam - lp.lam / HALFPI; |
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c = lp.phi / HALFPI; |
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d = (1 - c * c)/((sp = sin(lp.phi)) - c);
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r2 = tb / d; |
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r2 *= r2; |
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m = (tb * sp / d - 0.5 * tb)/(1. + r2); |
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n = (sp / r2 + 0.5 * d)/(1. + 1./r2); |
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xy.x = cos(lp.phi); |
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xy.x = sqrt(m * m + xy.x * xy.x / (1. + r2));
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xy.x = HALFPI * ( m + (lp.lam < 0. ? -xy.x : xy.x));
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xy.y = sqrt(n * n - (sp * sp / r2 + d * sp - 1.) /
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(1. + 1./r2)); |
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xy.y = HALFPI * ( n + (lp.phi < 0. ? xy.y : -xy.y ));
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} |
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return (xy);
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} |
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FREEUP; if (P) pj_dalloc(P); }
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ENTRY0(nicol) P->es = 0.; P->fwd = s_forward; ENDENTRY(P)
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