gbox_union()

int gbox_union	(	const GBOX *	g1,
		const GBOX *	g2,
		GBOX *	gout
	)

Update the output GBOX to be large enough to include both inputs.

Definition at line 142 of file g_box.c.

{
        if ( ( ! g1 ) && ( ! g2 ) )
                return LW_FALSE;
        else if (!g1)
        {
                memcpy(gout, g2, sizeof(GBOX));
                return LW_TRUE;
        }
        else if (!g2)
        {
                memcpy(gout, g1, sizeof(GBOX));
                return LW_TRUE;
        }
 
        gout->flags = g1->flags;
 
        gout->xmin = FP_MIN(g1->xmin, g2->xmin);
        gout->xmax = FP_MAX(g1->xmax, g2->xmax);
 
        gout->ymin = FP_MIN(g1->ymin, g2->ymin);
        gout->ymax = FP_MAX(g1->ymax, g2->ymax);
 
        gout->zmin = FP_MIN(g1->zmin, g2->zmin);
        gout->zmax = FP_MAX(g1->zmax, g2->zmax);
 
        return LW_TRUE;
}

References GBOX::flags, FP_MAX, FP_MIN, LW_FALSE, LW_TRUE, GBOX::xmax, GBOX::xmin, GBOX::ymax, GBOX::ymin, GBOX::zmax, and GBOX::zmin.

Referenced by BOX2D_union(), geography_bestsrid(), and lwt_ChangeEdgeGeom().

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