lwproj_from_str_pipeline()

LWPROJ* lwproj_from_str_pipeline	(	const char *	str_pipeline,
		bool	is_forward
	)

Allocate a new LWPROJ containing the reference to the PROJ's PJ using a PROJ pipeline definition:

Parameters

str_pipeline	the coordinate operation pipeline string. Either: urn:ogc:def:coordinateOperation:AUTHORITY::CODE a PROJ pipeline: +proj=pipeline ... concatenated operations: urn:ogc:def:coordinateOperation,coordinateOperation:EPSG::3895,coordinateOperation:EPSG::1618 any other coordinate operation accepted via proj_create()
is_foward	whether to execute the the pipeline in a forward or inverse direction.

Definition at line 122 of file liblwgeom/lwgeom_transform.c.

{
        /* Usable inputs? */
        if (!str_pipeline)
                return NULL;
 
        PJ* pj = proj_create(PJ_DEFAULT_CTX, str_pipeline);
        if (!pj)
                return NULL;
 
        /* check we have a transform, not a crs */
        if (proj_is_crs(pj))
                return NULL;
 
        /* Add in an axis swap if necessary */
        PJ* pj_norm = proj_normalize_for_visualization(PJ_DEFAULT_CTX, pj);
        if (!pj_norm)
                pj_norm = pj;
        /* Swap is not a copy of input? Clean up input */
        else if (pj != pj_norm)
                proj_destroy(pj);
 
        /* Allocate and populate return value */
        LWPROJ *lp = lwalloc(sizeof(LWPROJ));
        lp->pj = pj_norm; /* Caller is going to have to explicitly proj_destroy this */
        lp->pipeline_is_forward = is_forward;
 
        /* this is stuff for geography calculations; doesn't matter here */
        lp->source_is_latlong = LW_FALSE;
        lp->source_semi_major_metre = DBL_MAX;
        lp->source_semi_minor_metre = DBL_MAX;
        return lp;
}

References LW_FALSE, lwalloc(), LWPROJ::pipeline_is_forward, LWPROJ::pj, LWPROJ::source_is_latlong, LWPROJ::source_semi_major_metre, and LWPROJ::source_semi_minor_metre.

Referenced by lwgeom_transform_pipeline().

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