proj_cs_get_simplecs()

static PJ* proj_cs_get_simplecs ( const PJ *  pj_crs )

static

Definition at line 215 of file liblwgeom/lwgeom_transform.c.

{
        PJ *pj_sub = NULL;
        if (proj_get_type(pj_crs) == PJ_TYPE_COMPOUND_CRS)
        {
                /* Sub-CRS[0] is the horizontal component */
                pj_sub = proj_crs_get_sub_crs(NULL, pj_crs, 0);
                if (!pj_sub)
                        lwerror("%s: proj_crs_get_sub_crs(0) returned NULL", __func__);
        }
        else if (proj_get_type(pj_crs) == PJ_TYPE_BOUND_CRS)
        {
                pj_sub = proj_get_source_crs(NULL, pj_crs);
                if (!pj_sub)
                        lwerror("%s: proj_get_source_crs returned NULL", __func__);
        }
        else
        {
                /* If this works, we have a CS so we can return */
                pj_sub = proj_crs_get_coordinate_system(NULL, pj_crs);
                if (pj_sub)
                        return pj_sub;
        }
 
        /* Only sub-components of the Compound or Bound CRS's get here */
        /* If we failed to get sub-components, or we failed to extract */
        /* a CS from a generic CRS, then this is another case we don't */
        /* handle */
        if (!pj_sub)
                lwerror("%s: %s", __func__, proj_errno_string(proj_context_errno(NULL)));
 
        /* If the components are usable, we can extract the CS and return */
        int pj_type = proj_get_type(pj_sub);
        if (pj_type == PJ_TYPE_GEOGRAPHIC_2D_CRS || pj_type == PJ_TYPE_PROJECTED_CRS)
        {
                PJ *pj_2d = proj_crs_get_coordinate_system(NULL, pj_sub);
                proj_destroy(pj_sub);
                return pj_2d;
        }
 
        /* If the components are *themselves* Bound/Compound, we can recurse */
        if (pj_type == PJ_TYPE_COMPOUND_CRS || pj_type == PJ_TYPE_BOUND_CRS)
                return proj_cs_get_simplecs(pj_sub);
 
        /* This is a case we don't know how to handle */
        lwerror("%s: un-handled CRS sub-type: %s", __func__, pj_type);
        return NULL;
}

References lwerror().

Referenced by proj_crs_is_swapped().

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