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jfreechart example source code file (HeatMapUtilities.java)

This example jfreechart source code file (HeatMapUtilities.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - jfreechart tags/keywords

awt, bufferedimage, bufferedimage, comparable, comparable, heatmapdataset, heatmaputilities, illegalargumentexception, image, null, paint, xydataset, xyseries, xyseries, xyseriescollection, xyseriescollection

The jfreechart HeatMapUtilities.java source code

/* ===========================================================
 * JFreeChart : a free chart library for the Java(tm) platform
 * ===========================================================
 *
 * (C) Copyright 2000-2009, by Object Refinery Limited and Contributors.
 *
 * Project Info:  http://www.jfree.org/jfreechart/index.html
 *
 * This library is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation; either version 2.1 of the License, or
 * (at your option) any later version.
 *
 * This library 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 Lesser General Public
 * License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301,
 * USA.
 *
 * [Java is a trademark or registered trademark of Sun Microsystems, Inc.
 * in the United States and other countries.]
 *
 * ---------------------
 * HeatMapUtilities.java
 * ---------------------
 * (C) Copyright 2009, by Object Refinery Limited.
 *
 * Original Author:  David Gilbert (for Object Refinery Limited);
 * Contributor(s):   -;
 *
 * Changes:
 * --------
 * 28-Jan-2009 : Version 1 (DG);
 *
 */

package org.jfree.data.general;

import java.awt.Graphics2D;
import java.awt.Paint;
import java.awt.image.BufferedImage;
import org.jfree.chart.renderer.PaintScale;
import org.jfree.data.xy.XYDataset;
import org.jfree.data.xy.XYSeries;
import org.jfree.data.xy.XYSeriesCollection;

/**
 * A utility class for the {@link HeatMapDataset}.
 *
 * @since 1.0.13
 */
public abstract class HeatMapUtilities {

    /**
     * Returns a dataset containing one series that holds a copy of the (x, z)
     * data from one row (y-index) of the specified dataset.
     *
     * @param dataset  the dataset (<code>null not permitted).
     * @param row  the row (y) index.
     * @param seriesName  the series name/key (<code>null not permitted).
     *
     * @return The dataset.
     */
    public static XYDataset extractRowFromHeatMapDataset(HeatMapDataset dataset,
            int row, Comparable seriesName) {
        XYSeries series = new XYSeries(seriesName);
        int cols = dataset.getXSampleCount();
        for (int c = 0; c < cols; c++) {
            series.add(dataset.getXValue(c), dataset.getZValue(c, row));
        }
        XYSeriesCollection result = new XYSeriesCollection(series);
        return result;
    }

    /**
     * Returns a dataset containing one series that holds a copy of the (y, z)
     * data from one column (x-index) of the specified dataset.
     *
     * @param dataset  the dataset (<code>null not permitted).
     * @param column  the column (x) index.
     * @param seriesName  the series name (<code>null not permitted).
     *
     * @return The dataset.
     */
    public static XYDataset extractColumnFromHeatMapDataset(
            HeatMapDataset dataset, int column, Comparable seriesName) {
        XYSeries series = new XYSeries(seriesName);
        int rows = dataset.getYSampleCount();
        for (int r = 0; r < rows; r++) {
            series.add(dataset.getYValue(r), dataset.getZValue(column, r));
        }
        XYSeriesCollection result = new XYSeriesCollection(series);
        return result;
    }

    /**
     * Creates an image that displays the values from the specified dataset.
     *
     * @param dataset  the dataset (<code>null not permitted).
     * @param paintScale  the paint scale for the z-values (<code>null
     *         not permitted).
     *
     * @return A buffered image.
     */
    public static BufferedImage createHeatMapImage(HeatMapDataset dataset,
            PaintScale paintScale) {

        if (dataset == null) {
            throw new IllegalArgumentException("Null 'dataset' argument.");
        }
        if (paintScale == null) {
            throw new IllegalArgumentException("Null 'paintScale' argument.");
        }
        int xCount = dataset.getXSampleCount();
        int yCount = dataset.getYSampleCount();
        BufferedImage image = new BufferedImage(xCount, yCount,
                BufferedImage.TYPE_INT_ARGB);
        Graphics2D g2 = image.createGraphics();
        for (int xIndex = 0; xIndex < xCount; xIndex++) {
            for (int yIndex = 0; yIndex < yCount; yIndex++) {
                double z = dataset.getZValue(xIndex, yIndex);
                Paint p = paintScale.getPaint(z);
                g2.setPaint(p);
                g2.fillRect(xIndex, yCount - yIndex - 1, 1, 1);
            }
        }
        return image;
    }

}

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