barchartdemo3.java

很好的制作统计图表的代码

// Decompiled by DJ v3.7.7.81 Copyright 2004 Atanas Neshkov  Date: 7/18/2005 5:13:39 PM
// Home Page : http://members.fortunecity.com/neshkov/dj.html  - Check often for new version!
// Decompiler options: packimports(3) 

package org.jfree.chart.demo;

import java.awt.*;
import javax.swing.JPanel;
import org.jfree.chart.*;
import org.jfree.chart.axis.NumberAxis;
import org.jfree.chart.labels.*;
import org.jfree.chart.plot.*;
import org.jfree.chart.renderer.category.BarRenderer;
import org.jfree.chart.renderer.category.CategoryItemRenderer;
import org.jfree.data.category.CategoryDataset;
import org.jfree.data.general.DatasetUtilities;
import org.jfree.ui.*;

public class BarChartDemo3 extends ApplicationFrame
{
    static class CustomRenderer extends BarRenderer
    {

        public Paint getItemPaint(int i, int j)
        {
            return colors[j % colors.length];
        }

        private Paint colors[];

        public CustomRenderer(Paint apaint[])
        {
            colors = apaint;
        }
    }


    public BarChartDemo3(String s)
    {
        super(s);
        CategoryDataset categorydataset = createDataset();
        JFreeChart jfreechart = createChart(categorydataset);
        ChartPanel chartpanel = new ChartPanel(jfreechart);
        chartpanel.setPreferredSize(new Dimension(500, 270));
        setContentPane(chartpanel);
    }

    private static CategoryDataset createDataset()
    {
        double ad[][] = {
            {
                4D, 3D, -2D, 3D, 6D
            }
        };
        return DatasetUtilities.createCategoryDataset("Series ", "Category ", ad);
    }

    private static JFreeChart createChart(CategoryDataset categorydataset)
    {
        JFreeChart jfreechart = ChartFactory.createBarChart("Bar Chart Demo 3", "Category", "Value", categorydataset, PlotOrientation.VERTICAL, false, true, false);
        jfreechart.setBackgroundPaint(Color.lightGray);
        CategoryPlot categoryplot = jfreechart.getCategoryPlot();
        categoryplot.setNoDataMessage("NO DATA!");
        CustomRenderer customrenderer = new CustomRenderer(new Paint[] {
            Color.red, Color.blue, Color.green, Color.yellow, Color.orange, Color.cyan, Color.magenta, Color.blue
        });
        customrenderer.setItemLabelGenerator(new StandardCategoryItemLabelGenerator());
        customrenderer.setItemLabelsVisible(true);
        ItemLabelPosition itemlabelposition = new ItemLabelPosition(ItemLabelAnchor.CENTER, TextAnchor.CENTER, TextAnchor.CENTER, 45D);
        customrenderer.setPositiveItemLabelPosition(itemlabelposition);
        categoryplot.setRenderer(customrenderer);
        CategoryMarker categorymarker = new CategoryMarker("Category 3");
        categorymarker.setLabel("Special");
        categorymarker.setPaint(new Color(221, 255, 221, 128));
        categorymarker.setAlpha(0.5F);
        categorymarker.setLabelAnchor(RectangleAnchor.TOP_LEFT);
        categorymarker.setLabelTextAnchor(TextAnchor.TOP_LEFT);
        categorymarker.setLabelOffsetType(LengthAdjustmentType.CONTRACT);
        categoryplot.addDomainMarker(categorymarker, Layer.BACKGROUND);
        NumberAxis numberaxis = (NumberAxis)categoryplot.getRangeAxis();
        numberaxis.setStandardTickUnits(NumberAxis.createIntegerTickUnits());
        numberaxis.setLowerMargin(0.14999999999999999D);
        numberaxis.setUpperMargin(0.14999999999999999D);
        return jfreechart;
    }

    public static JPanel createDemoPanel()
    {
        JFreeChart jfreechart = createChart(createDataset());
        return new ChartPanel(jfreechart);
    }

    public static void main(String args[])
    {
        BarChartDemo3 barchartdemo3 = new BarChartDemo3("Bar Chart Demo 3");
        barchartdemo3.pack();
        RefineryUtilities.centerFrameOnScreen(barchartdemo3);
        barchartdemo3.setVisible(true);
    }
}