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39 lines
921 B
C++
39 lines
921 B
C++
#include "webmerc.h"
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namespace proj
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{
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namespace
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{
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struct projection_webmerc_t
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{
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};
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}
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bool projection_webmerc_setup(projection_t *proj)
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{
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projection_webmerc_t *ptr = (projection_webmerc_t *)malloc(sizeof(projection_webmerc_t));
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proj->proj_dat = ptr;
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return false;
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}
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bool projection_webmerc_fwd(const projection_t *proj, double lam, double phi, double *x, double *y)
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{
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// projection_webmerc_t *ptr = (projection_webmerc_t *)proj->proj_dat;
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*x = proj->k0 * lam;
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*y = proj->k0 * asinh(tan(phi));
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return false;
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}
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bool projection_webmerc_inv(const projection_t *proj, double x, double y, double *lam, double *phi)
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{
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// projection_webmerc_t *ptr = (projection_webmerc_t *)proj->proj_dat;
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*phi = atan(sinh(y / proj->k0));
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*lam = x / proj->k0;
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return true;
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}
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}
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