lwcircstring_calculate_gbox_cartesian()

static int lwcircstring_calculate_gbox_cartesian ( LWCIRCSTRING *  curve, GBOX *  gbox  )

static

Definition at line 591 of file g_box.c.

References GBOX::flags, LWCIRCSTRING::flags, FLAGS_GET_M, FLAGS_GET_Z, gbox_merge(), getPoint4d_p(), gflags(), lw_arc_calculate_gbox_cartesian(), LW_FAILURE, LW_SUCCESS, GBOX::mmax, GBOX::mmin, POINTARRAY::npoints, LWCIRCSTRING::points, GBOX::xmax, GBOX::xmin, GBOX::ymax, GBOX::ymin, GBOX::zmax, and GBOX::zmin.

Referenced by lwgeom_calculate_gbox_cartesian().

{
        uint8_t flags = gflags(FLAGS_GET_Z(curve->flags), FLAGS_GET_M(curve->flags), 0);
        GBOX tmp;
        POINT4D p1, p2, p3;
        int i;

        if ( ! curve ) return LW_FAILURE;
        if ( curve->points->npoints < 3 ) return LW_FAILURE;

        tmp.flags = flags;

        /* Initialize */
        gbox->xmin = gbox->ymin = gbox->zmin = gbox->mmin = FLT_MAX;
        gbox->xmax = gbox->ymax = gbox->zmax = gbox->mmax = -1*FLT_MAX;

        for ( i = 2; i < curve->points->npoints; i += 2 )
        {
                getPoint4d_p(curve->points, i-2, &p1);
                getPoint4d_p(curve->points, i-1, &p2);
                getPoint4d_p(curve->points, i, &p3);

                if (lw_arc_calculate_gbox_cartesian(&p1, &p2, &p3, &tmp) == LW_FAILURE)
                        continue;

                gbox_merge(&tmp, gbox);
        }

        return LW_SUCCESS;
}

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