/*
* This file is part of JGrasstools (http://www.jgrasstools.org)
* (C) HydroloGIS - www.hydrologis.com
*
* JGrasstools 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.
*
* 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, see <http://www.gnu.org/licenses/>.
*/
package org.jgrasstools.gears.utils;
import java.util.BitSet;
/**
* A matrix object that is backed by a bitmap.
*
* @author Andrea Antonello (www.hydrologis.com)
*/
public class BitMatrix {
private BitSet bitSet;
private int cols;
public BitMatrix( int cols, int rows ) {
this.cols = cols;
bitSet = new BitSet(cols * rows);
}
/**
* Gets the state of a particular bit.
*
* @param col the col in the matrix of the bit.
* @param row the row in the matrix of the bit.
* @return <code>true</code> if the bit is set, else <code>false</code>.
*/
public boolean isMarked( int col, int row ) {
return bitSet.get(row * cols + col);
}
/**
* Marks the bit in a given position.
*
* @param col the col position to mark.
* @param row the row position to mark.
*/
public void mark( int col, int row ) {
bitSet.set(row * cols + col);
}
/**
* Unmarks the bit in a given position.
*
* @param col the col position to mark.
* @param row the row position to mark.
*/
public void unMark( int col, int row ) {
bitSet.set(row * cols + col, false);
}
}