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/* File: topology.c
* Author: Jean Thierry-Mieg (mieg@mrc-lmba.cam.ac.uk)
* Copyright (C) J Thierry-Mieg and R Durbin, 1992
* -------------------------------------------------------------------
* Acedb is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
* or see the on-line version at http://www.gnu.org/copyleft/gpl.txt
* -------------------------------------------------------------------
* This file is part of the ACEDB genome database package, written by
* Richard Durbin (MRC LMB, UK) rd@mrc-lmba.cam.ac.uk, and
* Jean Thierry-Mieg (CRBM du CNRS, France) mieg@frmop11.bitnet
*
* Description:
* Exported functions:
topoConnectedComponents()
* HISTORY:
* Last edited: Mar 6 17:11 1996 (srk)
* Created: Fri Oct 30 19:08:43 1992 (mieg)
*-------------------------------------------------------------------
*/
/* $Id: topology.c,v 1.6 1999/09/01 10:57:41 fw Exp $ */
#include "acedb.h"
#include "keyset.h"
#include "topology.h"
/********************************/
static int topoFirstKeyOrder(void*a, void*b)
{
return ((LINK*) a) -> a - ((LINK*) b)-> a ;
}
/**************************************/
static void topoDoubleUnorientedLinks(Array links)
{
register int i = arrayMax(links) ;
register LINK *x , *y ;
arrayExtend(links, 2*i) ;
arrayMax(links) = 2*i ;
x = arrp(links, 0, LINK) ;
y = arrp(links, i, LINK) ;
while(i--)
{ x -> group = y -> group = 0 ;
*y = *x ; /* anything else, i.e. type */
y -> a = x -> b ;
y -> b = x -> a ;
x++ , y++ ;
}
arraySort(links, topoFirstKeyOrder) ;
}
/**************************************/
static void topoEnumerateVertex(Array links, Array vx)
{
register int i , n = arrayMax(links) , j = 0;
register KEY k = 0 ;
arrayMax(vx) = 0 ;
for(i = 0 ; i < n ; i++)
if ( k != arrp(links,i,LINK) -> a)
{ k = arrp(links,i,LINK) -> a ;
array(vx, j, VERTEX).a = k ;
array(vx, j, VERTEX).group = 0 ;
array(vx, j, VERTEX).pos = i ;
j++ ;
}
}
/**************************************/
static Array VX, LK;
static int GP ; /* number of the connected component */
/******************/
static int topoFindVertex(KEY k)
{
register int i = arrayMax(VX) ;
while(i--)
if(arrp(VX,i,VERTEX)->a == k)
return i ;
messcrash("Topofindvertex cannot find %d", k) ;
return 0 ; /* for compiler happiness */
}
/******************/
static void topoNCC2(int n)
{ KEY a = array(VX,n,VERTEX).a ;
int pos = array(VX,n,VERTEX).pos ;
array(VX,n,VERTEX).group = GP ;
for(;pos < arrayMax(LK) && array(LK, pos,LINK).a == a;pos++)
{ n = topoFindVertex(array(LK, pos,LINK).b) ;
if(!arr(VX,n,VERTEX).group)
topoNCC2(n) ;
else if(arr(VX,n,VERTEX).group != GP )
messcrash
("topoNCC2 : Double numbering, sorry") ;
}
}
/******************/
static void topoNumberLinks(Array links)
{ KEY a ;
register int i = arrayMax(links), n ;
while(i--)
{ a = arr(links,i,LINK).a ;
n = topoFindVertex(a) ;
arr(links,i,LINK).group = arr(VX,n,VERTEX).group ;
}
}
/*****************/
static int topoNumberConnectedComponents(Array links, Array vx)
{
register int n = arrayMax(vx) ;
VX = vx ; LK = links; GP = 0 ;
while(n--)
if(! arr(vx,n,VERTEX).group)
{ GP++ ;
topoNCC2(n) ;
}
return GP ;
}
/**************************************************************/
/************* Public Routines ********************************/
int topoConnectedComponents(Array links, Array vx)
{ Array cpLinks = arrayCopy(links) ;
int i ;
if(!arrayExists(links) || !arrayExists(vx))
messcrash("topoConnectedComponents called with bad array") ;
topoDoubleUnorientedLinks(cpLinks) ;
topoEnumerateVertex(cpLinks, vx) ;
i = topoNumberConnectedComponents(cpLinks, vx) ;
arrayDestroy(cpLinks) ;
topoNumberLinks(links) ;
return i ;
}
/**************************************************************/
/**************************************************************/
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