XYScatterChart.java

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/* *********************************************************************** *
 * project: org.matsim.*
 * XYScatterChart.java
 *                                                                         *
 * *********************************************************************** *
 *                                                                         *
 * copyright       : (C) 2007 by the members listed in the COPYING,        *
 *                   LICENSE and WARRANTY file.                            *
 * email           : info at matsim dot org                                *
 *                                                                         *
 * *********************************************************************** *
 *                                                                         *
 *   This program 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 2 of the License, or     *
 *   (at your option) any later version.                                   *
 *   See also COPYING, LICENSE and WARRANTY file                           *
 *                                                                         *
 * *********************************************************************** */

package org.matsim.core.utils.charts;

import org.jfree.chart.ChartFactory;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.axis.LogarithmicAxis;
import org.jfree.chart.plot.PlotOrientation;
import org.jfree.chart.plot.XYPlot;
import org.jfree.data.xy.XYSeries;
import org.jfree.data.xy.XYSeriesCollection;

public class XYScatterChart extends ChartUtil {

    private final XYSeriesCollection dataset;
    private final boolean isLogarithmicAxis;

    public XYScatterChart(final String title, final String xAxisLabel,
            final String yAxisLabel) {
        this(title, xAxisLabel, yAxisLabel, false);
    }

    public XYScatterChart(final String title, final String xAxisLabel,
            final String yAxisLabel, boolean isLogarithmicAxis) {
        super(title, xAxisLabel, yAxisLabel);
        this.isLogarithmicAxis = isLogarithmicAxis;
        this.dataset = new XYSeriesCollection();
        this.chart = createChart(title, xAxisLabel, yAxisLabel, this.dataset);
        addDefaultFormatting();
    }

    @Override
    public JFreeChart getChart() {
        return this.chart;
    }

    private JFreeChart createChart(final String title,
            final String categoryAxisLabel, final String valueAxisLabel,
            final XYSeriesCollection dataset) {
        JFreeChart c = ChartFactory.createScatterPlot(title, categoryAxisLabel,
                valueAxisLabel, dataset, PlotOrientation.VERTICAL, true, // legend?
                false, // tooltips?
                false // URLs?
                );
        if (this.isLogarithmicAxis) {
            XYPlot p = (XYPlot) c.getPlot();
            LogarithmicAxis axis_x = new LogarithmicAxis(this.xAxisLabel);
            LogarithmicAxis axis_y = new LogarithmicAxis(this.yAxisLabel);
            axis_x.setAllowNegativesFlag(false);
            axis_y.setAllowNegativesFlag(false);
            p.setDomainAxis(axis_x);
            p.setRangeAxis(axis_y);
        }
        return c;
    }

    public void addSeries(final String title, final double[] xs,
            final double[] ys) {
        XYSeries series = new XYSeries(title, false, true);
        for (int i = 0, n = Math.min(xs.length, ys.length); i < n; i++) {
            series.add(xs[i], ys[i]);
        }
        this.dataset.addSeries(series);
    }

}