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OptaPlanner solves planning problems.
This lightweight, embeddable planning engine implements powerful and scalable algorithms
to optimize business resource scheduling and planning.
This module contains the examples which demonstrate how to use it in a normal Java application.
/*
* Copyright 2010 JBoss Inc
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.optaplanner.examples.nqueens.swingui;
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.util.List;
import javax.swing.AbstractAction;
import javax.swing.BorderFactory;
import javax.swing.BoxLayout;
import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JComboBox;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import org.optaplanner.core.api.domain.solution.Solution;
import org.optaplanner.examples.common.swingui.SolutionPanel;
import org.optaplanner.examples.common.swingui.TangoColorFactory;
import org.optaplanner.examples.nqueens.domain.NQueens;
import org.optaplanner.examples.nqueens.domain.Queen;
import org.optaplanner.examples.nqueens.domain.Row;
public class NQueensPanel extends SolutionPanel {
public static final String LOGO_PATH = "/org/optaplanner/examples/nqueens/swingui/nqueensLogo.png";
private static final String QUEEN_IMAGE_PATH = "/org/optaplanner/examples/nqueens/swingui/queenImage.png";
private ImageIcon queenImageIcon;
public NQueensPanel() {
setLayout(new BoxLayout(this, BoxLayout.Y_AXIS));
setBackground(Color.BLACK);
queenImageIcon = new ImageIcon(getClass().getResource(QUEEN_IMAGE_PATH));
}
private NQueens getNQueens() {
return (NQueens) solutionBusiness.getSolution();
}
public void resetPanel(Solution solution) {
removeAll();
repaint(); // When GridLayout doesn't fill up all the space
NQueens nQueens = (NQueens) solution;
int n = nQueens.getN();
if (n > 100) {
JLabel tooBigToShowLabel = new JLabel("The dataset is too big to show.");
tooBigToShowLabel.setForeground(Color.WHITE);
add(tooBigToShowLabel);
return;
}
List queenList = nQueens.getQueenList();
setLayout(new GridLayout(n, n));
for (int row = 0; row < n; row++) {
for (int column = 0; column < n; column++) {
Queen queen = queenList.get(column);
if (queen.getColumn().getIndex() != column) {
throw new IllegalStateException("The queenList is not in the expected order.");
}
String toolTipText = "row " + row + ", column " + column;
if (queen.getRow() != null && queen.getRow().getIndex() == row) {
JButton button = new JButton(new QueenAction(queen));
button.setMinimumSize(new Dimension(20, 20));
button.setPreferredSize(new Dimension(20, 20));
button.setToolTipText(toolTipText);
add(button);
} else {
JPanel panel = new JPanel();
panel.setBorder(BorderFactory.createCompoundBorder(
BorderFactory.createLineBorder(TangoColorFactory.ALUMINIUM_6),
BorderFactory.createEmptyBorder(5, 5, 5, 5)));
Color background = (((row + column) % 2) == 0) ? Color.WHITE : TangoColorFactory.ALUMINIUM_3;
panel.setBackground(background);
panel.setToolTipText(toolTipText);
add(panel);
}
}
}
}
private class QueenAction extends AbstractAction {
private Queen queen;
public QueenAction(Queen queen) {
super(null, queenImageIcon);
this.queen = queen;
}
public void actionPerformed(ActionEvent e) {
List rowList = getNQueens().getRowList();
JPanel messagePanel = new JPanel(new BorderLayout());
messagePanel.add(new JLabel("Move to row: "), BorderLayout.WEST);
JComboBox rowListField = new JComboBox(rowList.toArray());
rowListField.setSelectedItem(queen.getRow());
messagePanel.add(rowListField, BorderLayout.CENTER);
int result = JOptionPane.showConfirmDialog(NQueensPanel.this.getRootPane(), messagePanel,
"Queen in column " + queen.getColumn().getIndex(),
JOptionPane.OK_CANCEL_OPTION);
if (result == JOptionPane.OK_OPTION) {
Row toRow = (Row) rowListField.getSelectedItem();
solutionBusiness.doChangeMove(queen, "row", toRow);
solverAndPersistenceFrame.resetScreen();
}
}
}
}