/* -*- tab-width: 4 -*-
*
* Electric(tm) VLSI Design System
*
* File: ChromsomeMutationMoveCells.java
* Written by Team 3: Christian Wittner, Ivan Dimitrov
*
* This code has been developed at the Karlsruhe Institute of Technology (KIT), Germany,
* as part of the course "Multicore Programming in Practice: Tools, Models, and Languages".
* Contact instructor: Dr. Victor Pankratius (pankratius@ipd.uka.de)
*
* Copyright (c) 2010 Sun Microsystems and Static Free Software
*
* Electric(tm) 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 3 of the License, or
* (at your option) any later version.
*
* Electric(tm) 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 Electric(tm); see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
* Boston, Mass 02111-1307, USA.
*/
package com.sun.electric.tool.placement.genetic1.g1;
import com.sun.electric.tool.placement.genetic1.Chromosome;
import com.sun.electric.tool.placement.genetic1.ChromosomeMutation;
import java.util.Random;
public class ChromsomeMutationMoveCells implements ChromosomeMutation {
static int nbrOfGenes2Move = -1;
static int moveMax;
public void setGeneMoveDitance(double geneMoveDistance, int chromosomesize) {
moveMax = (int) (geneMoveDistance * chromosomesize);
}
public void mutate(Chromosome c, Random r) {
assert (nbrOfGenes2Move > -1) : "set mutation rate before first usage";
for (int i = 0; i < nbrOfGenes2Move; i++) {
// select gene
int index = r.nextInt(c.Index2GenePositionInChromosome.length);
// random movement 0 to 10 = -5 to +5
int move = r.nextInt(11);
move -= 5;
// calculate target index
move += index;
// cap at index bounds
if (move < 0)
move = 0;
else if (move >= c.size())
move = c.size() - 1;
// move
int swap = c.Index2GenePositionInChromosome[index];
c.Index2GenePositionInChromosome[index] = c.Index2GenePositionInChromosome[move];
c.Index2GenePositionInChromosome[move] = swap;
assert (c.isIndex2GenePosValid());
}
}
public void setMutationRate(double mutationRate) {
nbrOfGenes2Move = (int) (mutationRate * GeneticPlacement.nodeProxies.length);
if (nbrOfGenes2Move < 1)
nbrOfGenes2Move = 1;
}
}