root / trunk / libraries / libjni-proj4 / src / PJ_crast.c @ 13129
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#ifndef lint
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static const char SCCSID[]="@(#)PJ_crast.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(crast, "Craster Parabolic (Putnins P4)")
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"\n\tPCyl., Sph.";
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#define XM 0.97720502380583984317 |
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#define RXM 1.02332670794648848847 |
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#define YM 3.06998012383946546542 |
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#define RYM 0.32573500793527994772 |
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#define THIRD 0.333333333333333333 |
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FORWARD(s_forward); /* spheroid */
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lp.phi *= THIRD; |
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xy.x = XM * lp.lam * (2. * cos(lp.phi + lp.phi) - 1.); |
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xy.y = YM * sin(lp.phi); |
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return (xy);
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} |
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INVERSE(s_inverse); /* spheroid */
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lp.phi = 3. * asin(xy.y * RYM);
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lp.lam = xy.x * RXM / (2. * cos((lp.phi + lp.phi) * THIRD) - 1); |
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return (lp);
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} |
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FREEUP; if (P) pj_dalloc(P); }
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ENTRY0(crast) P->es = 0.; P->inv = s_inverse; P->fwd = s_forward; ENDENTRY(P)
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