ptarray_from_twkb_state()

static POINTARRAY* ptarray_from_twkb_state ( twkb_parse_state *  s, uint32_t  npoints  )

static

POINTARRAY Read a dynamically sized point array and advance the parse state forward.

Definition at line 172 of file lwin_twkb.c.

References twkb_parse_state::coords, twkb_parse_state::factor, twkb_parse_state::factor_m, twkb_parse_state::factor_z, twkb_parse_state::has_m, twkb_parse_state::has_z, LWDEBUG, LWDEBUGF, twkb_parse_state::ndims, ptarray_construct(), ptarray_construct_empty(), POINTARRAY::serialized_pointlist, and twkb_parse_state_varint().

Referenced by lwline_from_twkb_state(), lwpoint_from_twkb_state(), and lwpoly_from_twkb_state().

{
        POINTARRAY *pa = NULL;
        uint32_t ndims = s->ndims;
        int i;
        double *dlist;

        LWDEBUG(2,"Entering ptarray_from_twkb_state");
        LWDEBUGF(4,"Pointarray has %d points", npoints);

        /* Empty! */
        if( npoints == 0 )
                return ptarray_construct_empty(s->has_z, s->has_m, 0);

        pa = ptarray_construct(s->has_z, s->has_m, npoints);
        dlist = (double*)(pa->serialized_pointlist);
        for( i = 0; i < npoints; i++ )
        {
                int j = 0;
                /* X */
                s->coords[j] += twkb_parse_state_varint(s);
                dlist[ndims*i + j] = s->coords[j] / s->factor;
                j++;
                /* Y */
                s->coords[j] += twkb_parse_state_varint(s);
                dlist[ndims*i + j] = s->coords[j] / s->factor;
                j++;
                /* Z */
                if ( s->has_z )
                {
                        s->coords[j] += twkb_parse_state_varint(s);
                        dlist[ndims*i + j] = s->coords[j] / s->factor_z;
                        j++;
                }
                /* M */
                if ( s->has_m )
                {
                        s->coords[j] += twkb_parse_state_varint(s);
                        dlist[ndims*i + j] = s->coords[j] / s->factor_m;
                        j++;
                }
        }

        return pa;
}

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