gui.BarChart.java Source code

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Here is the source code for gui.BarChart.java

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/* ===========================================================
 * JFreeChart : a free chart library for the Java(tm) platform
 * ===========================================================
 *
 * (C) Copyright 2000-2004, 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., 59 Temple Place, Suite 330,
 * Boston, MA 02111-1307, USA.
 *
 * [Java is a trademark or registered trademark of Sun Microsystems, Inc. 
 * in the United States and other countries.]
 *
 * -----------------
 * BarChart.java
 * -----------------
 * 
 */

package gui;

import java.awt.Color;
import java.awt.Dimension;
import java.awt.GradientPaint;

import javax.swing.ImageIcon;
import javax.swing.JFrame;

import org.jfree.chart.ChartFactory;
import org.jfree.chart.ChartPanel;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.axis.CategoryAxis;
import org.jfree.chart.axis.CategoryLabelPositions;
import org.jfree.chart.axis.NumberAxis;
import org.jfree.chart.labels.ItemLabelAnchor;
import org.jfree.chart.labels.ItemLabelPosition;
import org.jfree.chart.labels.StandardCategoryLabelGenerator;
import org.jfree.chart.plot.CategoryPlot;
import org.jfree.chart.plot.PlotOrientation;
import org.jfree.chart.renderer.BarRenderer;
import org.jfree.chart.renderer.CategoryItemRenderer;
import org.jfree.data.DefaultCategoryDataset;
import org.jfree.ui.RefineryUtilities;
import org.jfree.ui.TextAnchor;

/**
 * Diese Klasse liefert ein Einfaches Balkendiagramm, definiert durch
 * ein CategoryDataset, einen Titel und der X- und Y-Achsenbezeichnung.
 *
 */
public class BarChart extends JFrame {

    private final DefaultCategoryDataset dataset;
    private final String title;
    private final String label_x_axis;
    private final String label_y_axis;

    /**
      * Diagramm erstellen und anzeigen
      *
      * @param dataset Datenstze fr das Diagramm
      * @param title berschrift Diagramm und Frame
      * @param label_x_axis Beschriftung x Achse
      * @param label_y_axis Beschriftung y Achse
      * 
      */
    public BarChart(final DefaultCategoryDataset dataset, final String title, final String label_x_axis,
            final String label_y_axis) {

        super(title);
        super.setIconImage(new ImageIcon("./icons/ViewerMiniIcon.gif").getImage());

        this.dataset = dataset;
        this.title = title;
        this.label_x_axis = label_x_axis;
        this.label_y_axis = label_y_axis;

        final JFreeChart chart = createChart();
        final ChartPanel chartPanel = new ChartPanel(chart);
        chartPanel.setPreferredSize(new Dimension(800, 600));
        setContentPane(chartPanel);

        this.pack();
        RefineryUtilities.centerFrameOnScreen(this);
        this.setVisible(true);
    }

    /**
     * Zusammenbauen des Diagrammes.
     * 
     * @return diagramm
     */
    private JFreeChart createChart() {

        // create the chart...
        final JFreeChart chart = ChartFactory.createBarChart("", // berschrift
                label_x_axis, // x label
                label_y_axis, // y label
                dataset, // datenstze
                PlotOrientation.VERTICAL, // vertikale balken
                true, // mit legende
                true, // mit tooltips
                false // URLs???
        );

        // Layoutanpassungen im Folgende:

        // allg. Hintergrundfarbe
        chart.setBackgroundPaint(Color.white);

        // Referenz auf Zeichnung:
        final CategoryPlot plot = chart.getCategoryPlot();
        plot.setNoDataMessage("NO DATA!");

        // aussehen des eigentlichen diagrammes:
        plot.setBackgroundPaint(Color.lightGray);
        plot.setDomainGridlinePaint(Color.white);
        plot.setRangeGridlinePaint(Color.white);
        plot.setDomainGridlinesVisible(true);

        // skaleneinteilung:
        final NumberAxis rangeAxis = (NumberAxis) plot.getRangeAxis();
        rangeAxis.setStandardTickUnits(NumberAxis.createIntegerTickUnits());
        rangeAxis.setUpperMargin(0.1);

        // kategorien renderer einstellungen verndern:                
        final CategoryItemRenderer categories = plot.getRenderer();
        // casten in bar renderer:
        final BarRenderer bars = (BarRenderer) categories;

        // werte im diagramm anzeigen:
        categories.setLabelGenerator(new StandardCategoryLabelGenerator());
        categories.setItemLabelsVisible(true);
        final ItemLabelPosition p = new ItemLabelPosition(ItemLabelAnchor.OUTSIDE12, TextAnchor.CENTER,
                TextAnchor.CENTER, -Math.PI / 6);

        categories.setPositiveItemLabelPosition(p);
        categories.setNegativeItemLabelPosition(p);

        plot.setRenderer(categories);

        // farbverlauf der serien 1 und 2
        final GradientPaint gp0 = new GradientPaint(0.0f, 0.0f, new Color(127, 127, 255), 0.0f, 0.0f,
                new Color(127, 127, 127));
        final GradientPaint gp1 = new GradientPaint(0.0f, 0.0f, new Color(255, 127, 127), 0.0f, 0.0f,
                new Color(127, 127, 127));
        bars.setSeriesPaint(0, gp0);
        bars.setSeriesPaint(1, gp1);
        // keine umrandung der balken
        bars.setDrawBarOutline(false);

        // abstand der zahlen vom balken
        bars.setItemLabelAnchorOffset(13);

        // x achsenbeschriftung
        final CategoryAxis domainAxis = plot.getDomainAxis();
        domainAxis.setCategoryLabelPositions(CategoryLabelPositions.createUpRotationLabelPositions(Math.PI / 6.0));

        return chart;

    }
}