// Copyright (C) 1996 DIMACS Center, Rutgers, The State University of New Jersey
// Author(s): Jonathan Berry

// This software is copyrighted by the DIMACS Center at Rutgers, The State
// University of New Jersey.  IT IS PROVIDED AS IS, AND THE AUTHORS, DIMACS, AND
// RUTGERS, THE STATE UNIVERSITY OF NEW JERSEY  DISCLAIM
// ALL LIABILITY FOR DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL
// DAMAGES ARISING OUT OF THE USE OF THIS SOFTWARE, ITS DOCUMENTATION, OR ANY
// DERIVATIVES THEREOF, EVEN IF THE AUTHORS HAVE BEEN ADVISED OF THE
// POSSIBILITY OF SUCH DAMAGE.

// THE AUTHORS AND DISTRIBUTORS SPECIFICALLY DISCLAIM ANY WARRANTIES,
// INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE, AND NON-INFRINGEMENT.  THIS SOFTWARE
// IS PROVIDED ON AN "AS IS" BASIS, AND THE AUTHORS AND DISTRIBUTORS HAVE
// NO OBLIGATION TO PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR
// MODIFICATIONS.

// The authors hereby grant permission to use, copy, modify, distribute,
// and license this software and its documentation for any purpose, provided
// that existing copyright notices are retained in all copies and that this
// notice is included verbatim in any distributions. No written agreement,
// license, or royalty fee is required for any of the authorized uses.
// Modifications to this software may be copyrighted by their authors
// and need not follow the licensing terms described here, provided that
// the new terms are clearly indicated on the first page of each file where
// they apply.

// Last File Update: 31-Jul-1996
// 

#include<LINK/graph/Attribute.h>
#include<LINK/graph/Graph.h>
#include<LINK/layout/Layouts.h>
#include<math.h>

void 
GridLayout(Graph *g, int rows, int cols)
{
     
    const double 	top = 0.9;
    const double	bottom = 0.1;
    const double	x_inc = (top-bottom)/(cols+1);
    const double	y_inc = (top-bottom)/(rows+1); 
    int order = g->order();
    double x, y;
    
    const SortedArray<Vertex*> vgs = g->vertices(); 

    y = top;

    int i, j;
    for (i=0; i<rows; i++) {
        y = bottom + (i+1)*y_inc;
    	for (j=0; j<cols; j++) 
	    if ((i*cols+j) < order) {
        	x = bottom + (j+1)*x_inc;
        	setAttribute((GraphObject*) vgs[i*cols+j], "x", x);
        	setAttribute((GraphObject*) vgs[i*cols+j], "y", y);
    	    }
    }
}