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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.

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package org.optaplanner.examples.flightcrewscheduling.swingui;

import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.event.ComponentAdapter;
import java.awt.event.ComponentEvent;
import java.awt.image.BufferedImage;

import javax.swing.JPanel;

import org.optaplanner.examples.common.swingui.latitudelongitude.LatitudeLongitudeTranslator;
import org.optaplanner.examples.flightcrewscheduling.domain.Airport;
import org.optaplanner.examples.flightcrewscheduling.domain.Flight;
import org.optaplanner.examples.flightcrewscheduling.domain.FlightCrewSolution;
import org.optaplanner.swing.impl.TangoColorFactory;

public class FlightCrewSchedulingWorldPanel extends JPanel {

    private static final int TEXT_SIZE = 12;
    private static final int LOCATION_NAME_TEXT_SIZE = 8;

    private final FlightCrewSchedulingPanel flightCrewSchedulingPanel;

    private BufferedImage canvas = null;
    private LatitudeLongitudeTranslator translator = null;

    public FlightCrewSchedulingWorldPanel(FlightCrewSchedulingPanel flightCrewSchedulingPanel) {
        this.flightCrewSchedulingPanel = flightCrewSchedulingPanel;
        addComponentListener(new ComponentAdapter() {
            @Override
            public void componentResized(ComponentEvent e) {
                // TODO Not thread-safe during solving
                FlightCrewSolution solution = FlightCrewSchedulingWorldPanel.this.flightCrewSchedulingPanel.getSolution();
                if (solution != null) {
                    resetPanel(solution);
                }
            }
        });
    }

    public void resetPanel(FlightCrewSolution solution) {
        translator = new LatitudeLongitudeTranslator();
        for (Airport airport : solution.getAirportList()) {
            translator.addCoordinates(airport.getLatitude(), airport.getLongitude());
        }

        Dimension size = getSize();
        double width = size.getWidth();
        double height = size.getHeight();
        translator.prepareFor(width, height);

        Graphics2D g = createCanvas(width, height);
        g.setFont(g.getFont().deriveFont((float) LOCATION_NAME_TEXT_SIZE));
        g.setColor(TangoColorFactory.PLUM_2);
        for (Airport airport : solution.getAirportList()) {
            int x = translator.translateLongitudeToX(airport.getLongitude());
            int y = translator.translateLatitudeToY(airport.getLatitude());
            g.fillRect(x - 1, y - 1, 3, 3);
            g.drawString(airport.getCode(), x + 3, y - 3);
        }
        g.setColor(TangoColorFactory.CHOCOLATE_1);
        for (Flight flight : solution.getFlightList()) {
            Airport departureAirport = flight.getDepartureAirport();
            Airport arrivalAirport = flight.getArrivalAirport();
            translator.drawRoute(g, departureAirport.getLongitude(), departureAirport.getLatitude(),
                    arrivalAirport.getLongitude(), arrivalAirport.getLatitude(),
                    true, false);
        }
        g.setFont(g.getFont().deriveFont((float) TEXT_SIZE));
        // Legend
        g.setColor(TangoColorFactory.PLUM_2);
        g.fillRect(6, (int) height - 11, 3, 3);
        g.drawString("Airport", 15, (int) height - 5);
        repaint();
    }

    public void updatePanel(FlightCrewSolution solution) {
        resetPanel(solution);
    }

    private Graphics2D createCanvas(double width, double height) {
        int canvasWidth = (int) Math.ceil(width) + 1;
        int canvasHeight = (int) Math.ceil(height) + 1;
        canvas = new BufferedImage(canvasWidth, canvasHeight, BufferedImage.TYPE_INT_RGB);
        Graphics2D g = canvas.createGraphics();
        g.setColor(Color.WHITE);
        g.fillRect(0, 0, canvasWidth, canvasHeight);
        return g;
    }

    @Override
    protected void paintComponent(Graphics g) {
        super.paintComponent(g);
        if (canvas != null) {
            g.drawImage(canvas, 0, 0, this);
        }
    }

}