ptarray_calculate_gbox_geodetic()

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

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

Return LW_SUCCESS on success.

Definition at line 2873 of file lwgeodetic.c.

References edge_calculate_gbox(), GBOX::flags, gbox_duplicate(), gbox_init(), gbox_merge(), getPoint2d_cp(), ll2cart(), LW_FAILURE, LW_FALSE, LW_SUCCESS, LW_TRUE, POINTARRAY::npoints, POINT3D::x, GBOX::xmax, GBOX::xmin, POINT3D::y, GBOX::ymax, GBOX::ymin, POINT3D::z, GBOX::zmax, and GBOX::zmin.

Referenced by lwline_calculate_gbox_geodetic(), lwpoint_calculate_gbox_geodetic(), lwpolygon_calculate_gbox_geodetic(), and lwtriangle_calculate_gbox_geodetic().

{
        int i;
        int first = LW_TRUE;
        const POINT2D *p;
        POINT3D A1, A2;
        GBOX edge_gbox;

        assert(gbox);
        assert(pa);

        gbox_init(&edge_gbox);
        edge_gbox.flags = gbox->flags;

        if ( pa->npoints == 0 ) return LW_FAILURE;

        if ( pa->npoints == 1 )
        {
                p = getPoint2d_cp(pa, 0);
                ll2cart(p, &A1);
                gbox->xmin = gbox->xmax = A1.x;
                gbox->ymin = gbox->ymax = A1.y;
                gbox->zmin = gbox->zmax = A1.z;
                return LW_SUCCESS;
        }

        p = getPoint2d_cp(pa, 0);
        ll2cart(p, &A1);

        for ( i = 1; i < pa->npoints; i++ )
        {

                p = getPoint2d_cp(pa, i);
                ll2cart(p, &A2);

                edge_calculate_gbox(&A1, &A2, &edge_gbox);

                /* Initialize the box */
                if ( first )
                {
                        gbox_duplicate(&edge_gbox, gbox);
                        first = LW_FALSE;
                }
                /* Expand the box where necessary */
                else
                {
                        gbox_merge(&edge_gbox, gbox);
                }

                A1 = A2;
        }

        return LW_SUCCESS;
}

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