extract_pointarrays_from_lwgeom()

static LISTNODE* extract_pointarrays_from_lwgeom ( LWGEOM *  g )

static

Return a pointer to the first of one or more LISTNODEs holding the POINTARRAYs of a geometry.

Will not handle GeometryCollections.

Definition at line 84 of file lwiterator.c.

{
        switch(lwgeom_get_type(g))
        {
        case POINTTYPE:
                return prepend_node(lwgeom_as_lwpoint(g)->point, NULL);
        case LINETYPE:
                return prepend_node(lwgeom_as_lwline(g)->points, NULL);
        case TRIANGLETYPE:
                return prepend_node(lwgeom_as_lwtriangle(g)->points, NULL);
        case CIRCSTRINGTYPE:
                return prepend_node(lwgeom_as_lwcircstring(g)->points, NULL);
        case POLYGONTYPE:
        {
                LISTNODE* n = NULL;
 
                LWPOLY* p = lwgeom_as_lwpoly(g);
                int i;
                for (i = p->nrings - 1; i >= 0; i--)
                {
                        n = prepend_node(p->rings[i], n);
                }
 
                return n;
        }
        default:
                lwerror("Unsupported geometry type for lwpointiterator");
        }
 
        return NULL;
}

References CIRCSTRINGTYPE, LINETYPE, lwerror(), lwgeom_as_lwcircstring(), lwgeom_as_lwline(), lwgeom_as_lwpoint(), lwgeom_as_lwpoly(), lwgeom_as_lwtriangle(), lwgeom_get_type(), LWPOLY::nrings, POINTTYPE, POLYGONTYPE, prepend_node(), LWPOLY::rings, and TRIANGLETYPE.

Referenced by lwpointiterator_advance().

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