/* $Id: stress.h,v 1.7 2011/01/25 16:30:49 ellson Exp $ $Revision: 1.7 $ */
/* vim:set shiftwidth=4 ts=8: */

/*************************************************************************
 * Copyright (c) 2011 AT&T Intellectual Property 
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors: See CVS logs. Details at http://www.graphviz.org/
 *************************************************************************/

#ifdef __cplusplus
extern "C" {
#endif


#ifndef STRESS_H
#define STRESS_H

#include "defs.h"

#define tolerance_cg 1e-3

#define DFLT_ITERATIONS 200

#define DFLT_TOLERANCE 1e-4

    /* some possible values for 'num_pivots_stress' */
#define num_pivots_stress 40
#define num_pivots_smart_ini   0
#define num_pivots_no_ini   50

    /* relevant when using sparse distance matrix
     * when optimizing within subspace it can be set to 0
     * otherwise, recommended value is above zero (usually around 3-6)
     * some possible values for 'neighborhood_radius'
     */
#define neighborhood_radius_unrestricted  4
#define neighborhood_radius_subspace 0


    /* Full dense stress optimization (equivalent to Kamada-Kawai's energy) */
    /* Slowest and most accurate optimization */
    extern int stress_majorization_kD_mkernel(vtx_data * graph,	/* Input graph in sparse representation */
					      int n,	/* Number of nodes */
					      int nedges_graph,	/* Number of edges */
					      double **coords,	/* coordinates of nodes (output layout)  */
					      node_t **nodes,	/* original nodes  */
					      int dim,	/* dimemsionality of layout */
					      int smart_ini,	/* smart initialization */
					      int model,	/* model */
					      int maxi	/* max iterations */
	);

extern float *compute_apsp_packed(vtx_data * graph, int n);
extern float *compute_apsp_artifical_weights_packed(vtx_data * graph, int n);
extern float* circuitModel(vtx_data * graph, int nG);
extern float* mdsModel (vtx_data * graph, int nG);
extern int initLayout(vtx_data * graph, int n, int dim, double **coords, node_t** nodes);

#endif

#ifdef __cplusplus
}
#endif
