ptarray_removePoint()

POINTARRAY * ptarray_removePoint ( POINTARRAY *  pa, uint32_t  where  )

extern

Remove a point from a pointarray.

Parameters

which

- is the offset (starting at 0)

Returns

POINTARRAY is newly allocated

Definition at line 561 of file ptarray.c.

{
        POINTARRAY *ret;
        size_t ptsize = ptarray_point_size(pa);
 
        LWDEBUGF(3, "pa %x which %d", pa, which);
 
#if PARANOIA_LEVEL > 0
        if ( which > pa->npoints-1 )
        {
                lwerror("%s [%d] offset (%d) out of range (%d..%d)", __FILE__, __LINE__,
                        which, 0, pa->npoints-1);
                return NULL;
        }
 
        if ( pa->npoints < 3 )
        {
                lwerror("%s [%d] can't remove a point from a 2-vertex POINTARRAY", __FILE__, __LINE__);
                return NULL;
        }
#endif
 
        ret = ptarray_construct(FLAGS_GET_Z(pa->flags),
                                FLAGS_GET_M(pa->flags), pa->npoints-1);
 
        /* copy initial part */
        if ( which )
        {
                memcpy(getPoint_internal(ret, 0), getPoint_internal(pa, 0), ptsize*which);
        }
 
        /* copy final part */
        if ( which < pa->npoints-1 )
        {
                memcpy(getPoint_internal(ret, which), getPoint_internal(pa, which+1),
                       ptsize*(pa->npoints-which-1));
        }
 
        return ret;
}

References POINTARRAY::flags, FLAGS_GET_M, FLAGS_GET_Z, getPoint_internal(), LWDEBUGF, lwerror(), POINTARRAY::npoints, ptarray_construct(), and ptarray_point_size().

Referenced by lwcircstring_removepoint(), and lwline_removepoint().

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