verticalbarchartdemo2.java

大家打开看看啊, 很有用的东西

/* ======================================
 * JFreeChart : a free Java chart library
 * ======================================
 *
 * Project Info:  http://www.jfree.org/jfreechart/index.html
 * Project Lead:  David Gilbert ([e-mail]);
 *
 * (C) Copyright 2000-2003, by Object Refinery Limited and Contributors.
 *
 * 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.
 *
 * --------------------------
 * VerticalBarChartDemo2.java
 * --------------------------
 * (C) Copyright 2002, 2003, by Object Refinery Limited and Contributors.
 *
 * Original Author:  David Gilbert (for Object Refinery Limited);
 * Contributor(s):   -;
 *
 * $Id: VerticalBarChartDemo2.java,v 1.12 2003/07/29 16:12:44 mungady Exp $
 *
 * Changes
 * -------
 * 22-Aug-2002 : Version 1 (DG);
 * 28-Jul-2003 : Updated custom renderer for API changes in 0.9.10 (DG);
 *
 */

package org.jfree.chart.demo;

import java.awt.Color;
import java.awt.Paint;

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.NumberAxis;
import org.jfree.chart.axis.ValueAxis;
import org.jfree.chart.labels.StandardCategoryItemLabelGenerator;
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.CategoryDataset;
import org.jfree.data.DatasetUtilities;
import org.jfree.ui.ApplicationFrame;
import org.jfree.ui.RefineryUtilities;

/**
 * A bar chart that uses a custom renderer to display different colors within a series.
 *
 * @author David Gilbert
 */
public class VerticalBarChartDemo2 extends ApplicationFrame {

    /**
     * A custom renderer that returns a different color for each item in a single series.
     */
    class CustomRenderer extends BarRenderer {

        /** The colors. */
        private Paint[] colors;

        /**
         * Creates a new renderer.
         *
         * @param colors  the colors.
         */
        public CustomRenderer(Paint[] colors) {
            this.colors = colors;
        }

        /**
         * Returns the paint for an item.  Overrides the default behaviour inherited from
         * AbstractRenderer.
         *
         * @param row  the series.
         * @param column  the category.
         *
         * @return The item color.
         */
        public Paint getItemPaint(int row, int column) {
            return colors[column % colors.length];
        }
    }

    /**
     * Creates a new demo.
     *
     * @param title  the frame title.
     */
    public VerticalBarChartDemo2(String title) {

        super(title);

        // create a dataset...
        double[][] data = new double[][] {
            { 4.0, 3.0, 2.0, 3.0, 6.0, 3.0, 4.0, 3.0 }
        };

        CategoryDataset dataset = DatasetUtilities.createCategoryDataset(
            "Series ",
            "Category ",
            data
        );

        // create the chart...
        JFreeChart chart = ChartFactory.createBarChart(
            "Vertical Bar Chart",     // chart title
            "Category",               // domain axis label
            "Value",                  // range axis label
            dataset,                  // data
            PlotOrientation.VERTICAL,
            false,                    // include legend
            true,
            false
        );

        // NOW DO SOME OPTIONAL CUSTOMISATION OF THE CHART...

        // set the background color for the chart...
        chart.setBackgroundPaint(Color.lightGray);

        // get a reference to the plot for further customisation...
        CategoryPlot plot = chart.getCategoryPlot();
        plot.setNoDataMessage("NO DATA!");
        //plot.setBackgroundImage(JFreeChart.INFO.getLogo());

        CategoryItemRenderer renderer = new CustomRenderer(
            new Paint[] { Color.red, Color.blue, Color.green,
                          Color.yellow, Color.orange, Color.cyan,
                          Color.magenta, Color.blue });
        renderer.setItemLabelGenerator(new StandardCategoryItemLabelGenerator());
        renderer.setItemLabelsVisible(true);
        plot.setRenderer(renderer);

        // change the category labels to vertical...
        CategoryAxis domainAxis = plot.getDomainAxis();
        domainAxis.setSkipCategoryLabelsToFit(true);

        // change the margin at the top of the range axis...
        ValueAxis rangeAxis = plot.getRangeAxis();
        rangeAxis.setStandardTickUnits(NumberAxis.createIntegerTickUnits());
        rangeAxis.setUpperMargin(0.15);

        // OPTIONAL CUSTOMISATION COMPLETED.

        // add the chart to a panel...
        ChartPanel chartPanel = new ChartPanel(chart);
        chartPanel.setPreferredSize(new java.awt.Dimension(500, 270));
        setContentPane(chartPanel);

    }

    /**
     * Starting point for the demonstration application.
     *
     * @param args  ignored.
     */
    public static void main(String[] args) {

        VerticalBarChartDemo2 demo = new VerticalBarChartDemo2("Vertical Bar Chart Demo 2");
        demo.pack();
        RefineryUtilities.centerFrameOnScreen(demo);
        demo.setVisible(true);

    }

}