ptarray_remove_point()

int ptarray_remove_point	(	POINTARRAY *	pa,
		int	where
	)

Remove a point from an existing POINTARRAY.

Zero is the index of the start of the array.

Definition at line 261 of file ptarray.c.

References getPoint_internal(), LW_FAILURE, LW_SUCCESS, lwerror(), POINTARRAY::npoints, and ptarray_point_size().

Referenced by gbox_to_gml3(), and lwarc_linearize().

{
        size_t ptsize = ptarray_point_size(pa);

        /* Check for pathology */
        if( ! pa )
        {
                lwerror("ptarray_remove_point: null input");
                return LW_FAILURE;
        }

        /* Error on invalid offset value */
        if ( where >= pa->npoints || where < 0)
        {
                lwerror("ptarray_remove_point: offset out of range (%d)", where);
                return LW_FAILURE;
        }

        /* If the point is any but the last, we need to copy the data back one point */
        if( where < pa->npoints - 1 )
        {
                memmove(getPoint_internal(pa, where), getPoint_internal(pa, where+1), ptsize * (pa->npoints - where - 1));
        }

        /* We have one less point */
        pa->npoints--;

        return LW_SUCCESS;
}

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