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Feature: ISEA projection (generalized) #2

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Feature: ISEA projection (generalized) #2

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1 change: 1 addition & 0 deletions src/pj_list.h
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Original file line number Diff line number Diff line change
Expand Up @@ -79,6 +79,7 @@ PROJ_HEAD(imoll_o, "Interrupted Mollweide Oceanic View")
PROJ_HEAD(imw_p, "International Map of the World Polyconic")
PROJ_HEAD(dsea, "Dodecahedral Snyder Equal Area")
PROJ_HEAD(isea, "Icosahedral Snyder Equal Area")
PROJ_HEAD(isea2, "Icosahedral Snyder Equal Area (generalized)")
PROJ_HEAD(kav5, "Kavrayskiy V")
PROJ_HEAD(kav7, "Kavrayskiy VII")
PROJ_HEAD(krovak, "Krovak")
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18 changes: 18 additions & 0 deletions src/projections/polyhedral.cpp
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Expand Up @@ -24,12 +24,14 @@

#include "polyhedral/sphere.h"
#include "polyhedral/polyhedra/decakis_dodecahedron.h"
#include "polyhedral/polyhedra/hexakis_icosahedron.h"
#include "polyhedral/polyhedra/hexakis_tetrahedron.h"
#include "polyhedral/nets/dsea/a5.h"
#include "polyhedral/nets/dsea/crescent.h"
#include "polyhedral/nets/dsea/dsea.h"
#include "polyhedral/nets/dsea/icosahedron.h"
#include "polyhedral/nets/dsea/two_flower.h"
#include "polyhedral/nets/isea2/isea2.h"
#include "polyhedral/nets/tsea/tsea.h"

#include "proj.h"
Expand Down Expand Up @@ -113,6 +115,22 @@ PJ *PJ_PROJECTION(dsea) {
return P;
}

PROJ_HEAD(isea2, "Icosahedral Snyder Equal Area (generalized)") "\n\tSph";
constexpr double ISEA_STD_LAT_DEG = 58.282525588539;
constexpr double ISEA_STD_LON_DEG = 11.25;
PJ *PJ_PROJECTION(isea2) { // TODO rename to `isea`?
auto *Q = static_cast<pj_polyhedral_data *>( calloc(1, sizeof(pj_polyhedral_data)));
if (nullptr == Q) return pj_default_destructor(P, PROJ_ERR_OTHER /*ENOMEM*/);
P->opaque = Q;

polyhedral::load_triangles(Q, hexakis_icosahedron::SPH_TRI, nets::isea2::isea2::FACE_TRI);
polyhedral::set_orient_from_angles(Q, ISEA_STD_LAT_DEG, ISEA_STD_LON_DEG, 0.0);

P->fwd = polyhedral_fwd;
P->inv = polyhedral_inv;
return P;
}

PROJ_HEAD(tsea, "Tetrahedral Snyder Equal Area") "\n\tSph";
PJ *PJ_PROJECTION(tsea) {
auto *Q = static_cast<pj_polyhedral_data *>(calloc(1, sizeof(pj_polyhedral_data)));
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