lwgeom_transform()

int lwgeom_transform	(	LWGEOM *	geom,
		projPJ	inpj,
		projPJ	outpj
	)

Transform (reproject) a geometry in-place.

Parameters

geom	the geometry to transform
inpj	the input (or current, or source) projection
outpj	the output (or destination) projection

Transform (reproject) a geometry in-place.

Definition at line 74 of file liblwgeom/lwgeom_transform.c.

{
        uint32_t i;
 
        /* No points to transform in an empty! */
        if ( lwgeom_is_empty(geom) )
                return LW_SUCCESS;
 
        switch(geom->type)
        {
                case POINTTYPE:
                case LINETYPE:
                case CIRCSTRINGTYPE:
                case TRIANGLETYPE:
                {
                        LWLINE *g = (LWLINE*)geom;
                        if ( ! ptarray_transform(g->points, inpj, outpj) ) return LW_FAILURE;
                        break;
                }
                case POLYGONTYPE:
                {
                        LWPOLY *g = (LWPOLY*)geom;
                        for ( i = 0; i < g->nrings; i++ )
                        {
                                if ( ! ptarray_transform(g->rings[i], inpj, outpj) ) return LW_FAILURE;
                        }
                        break;
                }
                case MULTIPOINTTYPE:
                case MULTILINETYPE:
                case MULTIPOLYGONTYPE:
                case COLLECTIONTYPE:
                case COMPOUNDTYPE:
                case CURVEPOLYTYPE:
                case MULTICURVETYPE:
                case MULTISURFACETYPE:
                case POLYHEDRALSURFACETYPE:
                case TINTYPE:
                {
                        LWCOLLECTION *g = (LWCOLLECTION*)geom;
                        for ( i = 0; i < g->ngeoms; i++ )
                        {
                                if ( ! lwgeom_transform(g->geoms[i], inpj, outpj) ) return LW_FAILURE;
                        }
                        break;
                }
                default:
                {
                        lwerror("lwgeom_transform: Cannot handle type '%s'",
                                  lwtype_name(geom->type));
                        return LW_FAILURE;
                }
        }
        return LW_SUCCESS;
}

References CIRCSTRINGTYPE, COLLECTIONTYPE, COMPOUNDTYPE, CURVEPOLYTYPE, LWCOLLECTION::geoms, LINETYPE, LW_FAILURE, LW_SUCCESS, lwerror(), lwgeom_is_empty(), lwgeom_transform(), lwtype_name(), MULTICURVETYPE, MULTILINETYPE, MULTIPOINTTYPE, MULTIPOLYGONTYPE, MULTISURFACETYPE, LWCOLLECTION::ngeoms, LWPOLY::nrings, LWLINE::points, POINTTYPE, POLYGONTYPE, POLYHEDRALSURFACETYPE, ptarray_transform(), LWPOLY::rings, TINTYPE, TRIANGLETYPE, and LWGEOM::type.

Referenced by lwgeom_transform(), transform(), and transform_geom().

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