ptarray_calculate_gbox_cartesian()

int ptarray_calculate_gbox_cartesian	(	const POINTARRAY *	pa,
		GBOX *	gbox
	)

Calculate box (x/y) and add values to gbox.

Return LW_SUCCESS on success.

Definition at line 547 of file g_box.c.

References GBOX::flags, POINTARRAY::flags, FLAGS_GET_M, FLAGS_GET_Z, FP_MAX, FP_MIN, getPoint4d_p(), gflags(), LW_FAILURE, LW_SUCCESS, LWDEBUGF, POINT4D::m, GBOX::mmax, GBOX::mmin, POINTARRAY::npoints, POINT4D::x, GBOX::xmax, GBOX::xmin, POINT4D::y, GBOX::ymax, GBOX::ymin, POINT4D::z, GBOX::zmax, and GBOX::zmin.

Referenced by LWGEOM_interiorringn_polygon(), lwline_calculate_gbox_cartesian(), lwpoint_calculate_gbox_cartesian(), lwpoly_calculate_gbox_cartesian(), lwtriangle_calculate_gbox_cartesian(), and ptarray_area_spheroid().

{
        int i;
        POINT4D p;
        int has_z, has_m;

        if ( ! pa ) return LW_FAILURE;
        if ( ! gbox ) return LW_FAILURE;
        if ( pa->npoints < 1 ) return LW_FAILURE;

        has_z = FLAGS_GET_Z(pa->flags);
        has_m = FLAGS_GET_M(pa->flags);
        gbox->flags = gflags(has_z, has_m, 0);
        LWDEBUGF(4, "ptarray_calculate_gbox Z: %d M: %d", has_z, has_m);

        getPoint4d_p(pa, 0, &p);
        gbox->xmin = gbox->xmax = p.x;
        gbox->ymin = gbox->ymax = p.y;
        if ( has_z )
                gbox->zmin = gbox->zmax = p.z;
        if ( has_m )
                gbox->mmin = gbox->mmax = p.m;

        for ( i = 1 ; i < pa->npoints; i++ )
        {
                getPoint4d_p(pa, i, &p);
                gbox->xmin = FP_MIN(gbox->xmin, p.x);
                gbox->xmax = FP_MAX(gbox->xmax, p.x);
                gbox->ymin = FP_MIN(gbox->ymin, p.y);
                gbox->ymax = FP_MAX(gbox->ymax, p.y);
                if ( has_z )
                {
                        gbox->zmin = FP_MIN(gbox->zmin, p.z);
                        gbox->zmax = FP_MAX(gbox->zmax, p.z);
                }
                if ( has_m )
                {
                        gbox->mmin = FP_MIN(gbox->mmin, p.m);
                        gbox->mmax = FP_MAX(gbox->mmax, p.m);
                }
        }
        return LW_SUCCESS;
}

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