lwgeom_reverse_in_place()

void lwgeom_reverse_in_place

(

LWGEOM *

geom

)

Reverse vertex order of LWGEOM.

Definition at line 103 of file lwgeom.c.

{
        uint32_t i;
        LWCOLLECTION *col;
        if (!geom)
                return;
 
        switch (geom->type)
        {
                case MULTIPOINTTYPE:
                case POINTTYPE:
                {
                        return;
                }
                case TRIANGLETYPE:
                case CIRCSTRINGTYPE:
                case LINETYPE:
                {
                        LWLINE *line = (LWLINE *)(geom);
                        ptarray_reverse_in_place(line->points);
                        return;
                }
                case POLYGONTYPE:
                {
                        LWPOLY *poly = (LWPOLY *)(geom);
                        if (!poly->rings)
                                return;
                        uint32_t r;
                        for (r = 0; r < poly->nrings; r++)
                                ptarray_reverse_in_place(poly->rings[r]);
                        return;
                }
                /* CompoundCurve needs to also reverse the sub-geometries */
                /* so that the end-points remain coincident */
                case COMPOUNDTYPE:
                {
                        uint32_t ngeoms;
                        col = (LWCOLLECTION *)(geom);
                        if (!col->geoms)
                                return;
                        ngeoms = col->ngeoms;
                        for (i=0; i<ngeoms; i++)
                                lwgeom_reverse_in_place(col->geoms[i]);
                        for (i=0; i<col->ngeoms/2; i++) {
                                LWGEOM* tmp = col->geoms[i];
                                col->geoms[i] = col->geoms[ngeoms-i-1];
                                col->geoms[ngeoms-i-1] = tmp;
                        }
                        return;
                }
                case MULTICURVETYPE:
                case MULTILINETYPE:
                case MULTIPOLYGONTYPE:
                case MULTISURFACETYPE:
                case POLYHEDRALSURFACETYPE:
                case TINTYPE:
                case COLLECTIONTYPE:
                case CURVEPOLYTYPE:
                {
                        col = (LWCOLLECTION *)(geom);
                        if (!col->geoms)
                                return;
                        for (i=0; i<col->ngeoms; i++)
                                lwgeom_reverse_in_place(col->geoms[i]);
                        return;
                }
                default:
                {
                        lwerror("%s: Unknown geometry type: %s", __func__, lwtype_name(geom->type));
                        return;
                }
 
        }
}

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

Referenced by lwgeom_reverse(), LWGEOM_reverse(), lwgeom_reverse_in_place(), lwt_GetFaceEdges(), ST_IsPolygonCCW(), and test_lwcurve_linearize().

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