lwgeom_swap_ordinates()

void lwgeom_swap_ordinates	(	LWGEOM *	in,
		LWORD	o1,
		LWORD	o2
	)

Swap ordinate values in every vertex of the geometry.

Ordinates to swap are specified using an index with meaning: 0=x, 1=y, 2=z, 3=m

Swapping an existing ordinate with an unexisting one results in undefined value being written in the existing ordinate. Caller should verify and prevent such calls.

Availability: 2.2.0

Definition at line 1541 of file lwgeom.c.

{
        LWCOLLECTION *col;
        LWPOLY *poly;
        uint32_t i;
 
        if ( (!in) || lwgeom_is_empty(in) ) return;
 
  /* TODO: check for lwgeom NOT having the specified dimension ? */
 
        LWDEBUGF(4, "lwgeom_flip_coordinates, got type: %s",
                 lwtype_name(in->type));
 
        switch (in->type)
        {
        case POINTTYPE:
                ptarray_swap_ordinates(lwgeom_as_lwpoint(in)->point, o1, o2);
                break;
 
        case LINETYPE:
                ptarray_swap_ordinates(lwgeom_as_lwline(in)->points, o1, o2);
                break;
 
        case CIRCSTRINGTYPE:
                ptarray_swap_ordinates(lwgeom_as_lwcircstring(in)->points, o1, o2);
                break;
 
        case POLYGONTYPE:
                poly = (LWPOLY *) in;
                for (i=0; i<poly->nrings; i++)
                {
                        ptarray_swap_ordinates(poly->rings[i], o1, o2);
                }
                break;
 
        case TRIANGLETYPE:
                ptarray_swap_ordinates(lwgeom_as_lwtriangle(in)->points, o1, o2);
                break;
 
        case MULTIPOINTTYPE:
        case MULTILINETYPE:
        case MULTIPOLYGONTYPE:
        case COLLECTIONTYPE:
        case COMPOUNDTYPE:
        case CURVEPOLYTYPE:
        case MULTISURFACETYPE:
        case MULTICURVETYPE:
        case POLYHEDRALSURFACETYPE:
        case TINTYPE:
                col = (LWCOLLECTION *) in;
                for (i=0; i<col->ngeoms; i++)
                {
                        lwgeom_swap_ordinates(col->geoms[i], o1, o2);
                }
                break;
 
        default:
                lwerror("lwgeom_swap_ordinates: unsupported geometry type: %s",
                        lwtype_name(in->type));
                return;
        }
 
        /* only refresh bbox if X or Y changed */
        if ( in->bbox && (o1 < 2 || o2 < 2) )
        {
                lwgeom_refresh_bbox(in);
        }
}

References LWGEOM::bbox, CIRCSTRINGTYPE, COLLECTIONTYPE, COMPOUNDTYPE, CURVEPOLYTYPE, LWCOLLECTION::geoms, LINETYPE, LWDEBUGF, lwerror(), lwgeom_as_lwcircstring(), lwgeom_as_lwline(), lwgeom_as_lwpoint(), lwgeom_as_lwtriangle(), lwgeom_is_empty(), lwgeom_refresh_bbox(), lwgeom_swap_ordinates(), lwtype_name(), MULTICURVETYPE, MULTILINETYPE, MULTIPOINTTYPE, MULTIPOLYGONTYPE, MULTISURFACETYPE, LWCOLLECTION::ngeoms, LWPOLY::nrings, POINTTYPE, POLYGONTYPE, POLYHEDRALSURFACETYPE, ptarray_swap_ordinates(), LWPOLY::rings, TINTYPE, TRIANGLETYPE, and LWGEOM::type.

Referenced by do_lwgeom_swap_ordinates(), lwgeom_swap_ordinates(), ST_FlipCoordinates(), and ST_SwapOrdinates().

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