ptarray_reverse_in_place()

void ptarray_reverse_in_place

(

POINTARRAY *

pa

)

Definition at line 339 of file ptarray.c.

{
        if (!pa->npoints)
                return;
        uint32_t i;
        uint32_t last = pa->npoints - 1;
        uint32_t mid = pa->npoints / 2;
 
        double *d = (double*)(pa->serialized_pointlist);
        int j;
        int ndims = FLAGS_NDIMS(pa->flags);
        for (i = 0; i < mid; i++)
        {
                for (j = 0; j < ndims; j++)
                {
                        double buf;
                        buf = d[i*ndims+j];
                        d[i*ndims+j] = d[(last-i)*ndims+j];
                        d[(last-i)*ndims+j] = buf;
                }
        }
        return;
}

References POINTARRAY::flags, FLAGS_NDIMS, POINTARRAY::npoints, and POINTARRAY::serialized_pointlist.

Referenced by _lwt_HealEdges(), _lwt_MakeRingShell(), lwgeom_reverse_in_place(), lwpoly_force_clockwise(), and lwtriangle_force_clockwise().

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