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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.projectjobscheduling.swingui;

import java.awt.BasicStroke;
import java.awt.BorderLayout;
import java.awt.Rectangle;
import java.util.LinkedHashMap;
import java.util.Map;

import org.jfree.chart.ChartPanel;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.axis.NumberAxis;
import org.jfree.chart.plot.PlotOrientation;
import org.jfree.chart.plot.XYPlot;
import org.jfree.chart.renderer.xy.YIntervalRenderer;
import org.jfree.data.xy.YIntervalSeries;
import org.jfree.data.xy.YIntervalSeriesCollection;
import org.optaplanner.examples.common.swingui.SolutionPanel;
import org.optaplanner.examples.projectjobscheduling.domain.Allocation;
import org.optaplanner.examples.projectjobscheduling.domain.Project;
import org.optaplanner.examples.projectjobscheduling.domain.Schedule;
import org.optaplanner.swing.impl.TangoColorFactory;

public class ProjectJobSchedulingPanel extends SolutionPanel {

    public static final String LOGO_PATH =
            "/org/optaplanner/examples/projectjobscheduling/swingui/projectJobSchedulingLogo.png";

    public ProjectJobSchedulingPanel() {
        setLayout(new BorderLayout());
    }

    @Override
    public void resetPanel(Schedule schedule) {
        removeAll();
        ChartPanel chartPanel = new ChartPanel(createChart(schedule));
        add(chartPanel, BorderLayout.CENTER);
    }

    private JFreeChart createChart(Schedule schedule) {
        YIntervalSeriesCollection seriesCollection = new YIntervalSeriesCollection();
        Map projectSeriesMap = new LinkedHashMap<>(
                schedule.getProjectList().size());
        YIntervalRenderer renderer = new YIntervalRenderer();
        int maximumEndDate = 0;
        int seriesIndex = 0;
        TangoColorFactory tangoColorFactory = new TangoColorFactory();
        for (Project project : schedule.getProjectList()) {
            YIntervalSeries projectSeries = new YIntervalSeries(project.getLabel());
            seriesCollection.addSeries(projectSeries);
            projectSeriesMap.put(project, projectSeries);
            renderer.setSeriesShape(seriesIndex, new Rectangle());
            renderer.setSeriesStroke(seriesIndex, new BasicStroke(3.0f));
            renderer.setSeriesPaint(seriesIndex, tangoColorFactory.pickColor(project));
            seriesIndex++;
        }
        for (Allocation allocation : schedule.getAllocationList()) {
            int startDate = allocation.getStartDate();
            int endDate = allocation.getEndDate();
            YIntervalSeries projectSeries = projectSeriesMap.get(allocation.getProject());
            projectSeries.add(allocation.getId(), (startDate + endDate) / 2.0,
                    startDate, endDate);
            maximumEndDate = Math.max(maximumEndDate, endDate);
        }
        NumberAxis domainAxis = new NumberAxis("Job");
        domainAxis.setStandardTickUnits(NumberAxis.createIntegerTickUnits());
        domainAxis.setRange(-0.5, schedule.getAllocationList().size() - 0.5);
        domainAxis.setInverted(true);
        NumberAxis rangeAxis = new NumberAxis("Day (start to end date)");
        rangeAxis.setRange(-0.5, maximumEndDate + 0.5);
        XYPlot plot = new XYPlot(seriesCollection, domainAxis, rangeAxis, renderer);
        plot.setOrientation(PlotOrientation.HORIZONTAL);
        plot.setDomainGridlinePaint(TangoColorFactory.ALUMINIUM_5);
        plot.setRangeGridlinePaint(TangoColorFactory.ALUMINIUM_5);
        return new JFreeChart("Project Job Scheduling", JFreeChart.DEFAULT_TITLE_FONT,
                plot, true);
    }

}