barchartdemo7.java

在软件开发中用来绘制各种图表的源码

/* ------------------
 * BarChartDemo7.java
 * ------------------
 * (C) Copyright 2004-2005, by Object Refinery Limited.
 *
 */

package demo;

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

import javax.swing.JPanel;

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.StandardCategoryItemLabelGenerator;
import org.jfree.chart.plot.CategoryPlot;
import org.jfree.chart.plot.IntervalMarker;
import org.jfree.chart.plot.PlotOrientation;
import org.jfree.chart.renderer.category.BarRenderer;
import org.jfree.data.category.CategoryDataset;
import org.jfree.data.category.DefaultCategoryDataset;
import org.jfree.text.TextUtilities;
import org.jfree.ui.ApplicationFrame;
import org.jfree.ui.Layer;
import org.jfree.ui.RectangleAnchor;
import org.jfree.ui.RefineryUtilities;
import org.jfree.ui.TextAnchor;
import org.jfree.util.Log;
import org.jfree.util.PrintStreamLogTarget;

/**
 * A simple demonstration application showing how to create a bar chart with a 
 * custom item label generator.
 */
public class BarChartDemo7 extends ApplicationFrame {

    /**
     * A custom label generator.
     */
    static class LabelGenerator extends StandardCategoryItemLabelGenerator {
        /**
         * Generates an item label.
         * 
         * @param dataset  the dataset.
         * @param series  the series index.
         * @param category  the category index.
         * 
         * @return the label.
         */
        public String generateItemLabel(CategoryDataset dataset, 
                                        int series, 
                                        int category) {
            return dataset.getRowKey(series).toString();
        }
    }
    
    /**
     * Creates a new demo instance.
     *
     * @param title  the frame title.
     */
    public BarChartDemo7(String title) {
        super(title);
        CategoryDataset dataset = createDataset();
        JFreeChart chart = createChart(dataset);
        ChartPanel chartPanel = new ChartPanel(chart);
        chartPanel.setPreferredSize(new Dimension(500, 270));
        setContentPane(chartPanel);
    }

    /**
     * Returns a sample dataset.
     * 
     * @return The dataset.
     */
    private static CategoryDataset createDataset() {
        
        // row keys...
        String series1 = "First";
        String series2 = "Second";
        String series3 = "Third";

        // column keys...
        String category1 = "Category 1";
        String category2 = "Category 2";
        String category3 = "Category 3";
        String category4 = "Category 4";
        String category5 = "Category 5";

        // create the dataset...
        DefaultCategoryDataset dataset = new DefaultCategoryDataset();

        dataset.addValue(1.0, series1, category1);
        dataset.addValue(4.0, series1, category2);
        dataset.addValue(3.0, series1, category3);
        dataset.addValue(5.0, series1, category4);
        dataset.addValue(5.0, series1, category5);

        dataset.addValue(5.0, series2, category1);
        dataset.addValue(7.0, series2, category2);
        dataset.addValue(6.0, series2, category3);
        dataset.addValue(8.0, series2, category4);
        dataset.addValue(4.0, series2, category5);

        dataset.addValue(4.0, series3, category1);
        dataset.addValue(3.0, series3, category2);
        dataset.addValue(2.0, series3, category3);
        dataset.addValue(3.0, series3, category4);
        dataset.addValue(6.0, series3, category5);
        
        return dataset;
        
    }
    
    /**
     * Creates a sample chart.
     * 
     * @param dataset  the dataset.
     * 
     * @return The chart.
     */
    private static JFreeChart createChart(CategoryDataset dataset) {
        
        // create the chart...
        JFreeChart chart = ChartFactory.createBarChart(
            "Bar Chart Demo 7",       // chart title
            "Category",               // domain axis label
            "Value",                  // range axis label
            dataset,                  // data
            PlotOrientation.VERTICAL, // orientation
            false,                    // include legend
            true,                     // tooltips?
            false                     // URLs?
        );

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

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

        // get a reference to the plot for further customisation...
        CategoryPlot plot = chart.getCategoryPlot();
        plot.setBackgroundPaint(Color.lightGray);
        plot.setDomainGridlinePaint(Color.white);
        plot.setRangeGridlinePaint(Color.white);
        
        IntervalMarker target = new IntervalMarker(4.5, 7.5);
        target.setLabel("Target Range");
        target.setLabelFont(new Font("SansSerif", Font.ITALIC, 11));
        target.setLabelAnchor(RectangleAnchor.LEFT);
        target.setLabelTextAnchor(TextAnchor.CENTER_LEFT);
        target.setPaint(new Color(222, 222, 255, 128));
        plot.addRangeMarker(target, Layer.BACKGROUND);
        
        // set the range axis to display integers only...
        NumberAxis rangeAxis = (NumberAxis) plot.getRangeAxis();
        rangeAxis.setStandardTickUnits(NumberAxis.createIntegerTickUnits());

        // disable bar outlines...
        BarRenderer renderer = (BarRenderer) plot.getRenderer();
        renderer.setDrawBarOutline(false);
        renderer.setItemMargin(0.10);
        
        // set up gradient paints for series...
        GradientPaint gp0 = new GradientPaint(
            0.0f, 0.0f, Color.blue, 
            0.0f, 0.0f, Color.lightGray
        );
        GradientPaint gp1 = new GradientPaint(
            0.0f, 0.0f, Color.green, 
            0.0f, 0.0f, Color.lightGray
        );
        GradientPaint gp2 = new GradientPaint(
            0.0f, 0.0f, Color.red, 
            0.0f, 0.0f, Color.lightGray
        );
        renderer.setSeriesPaint(0, gp0);
        renderer.setSeriesPaint(1, gp1);
        renderer.setSeriesPaint(2, gp2);
        
        renderer.setItemLabelGenerator(new BarChartDemo7.LabelGenerator());
        renderer.setItemLabelsVisible(true);
        ItemLabelPosition p = new ItemLabelPosition(
            ItemLabelAnchor.INSIDE12, TextAnchor.CENTER_RIGHT, 
            TextAnchor.CENTER_RIGHT, -Math.PI / 2.0
        );
        renderer.setPositiveItemLabelPosition(p);

        ItemLabelPosition p2 = new ItemLabelPosition(
            ItemLabelAnchor.OUTSIDE12, TextAnchor.CENTER_LEFT, 
            TextAnchor.CENTER_LEFT, -Math.PI / 2.0
        );
        renderer.setPositiveItemLabelPositionFallback(p2);
        CategoryAxis domainAxis = plot.getDomainAxis();
        domainAxis.setCategoryLabelPositions(CategoryLabelPositions.UP_45);
        // OPTIONAL CUSTOMISATION COMPLETED.
        
        return chart;
        
    }
    
    /**
     * Creates a panel for the demo (used by SuperDemo.java).
     * 
     * @return A panel.
     */
    public static JPanel createDemoPanel() {
        JFreeChart chart = createChart(createDataset());
        return new ChartPanel(chart);
    }
    
    /**
     * Starting point for the demonstration application.
     *
     * @param args  ignored.
     */
    public static void main(String[] args) {

        Log.getInstance().addTarget(new PrintStreamLogTarget());
        TextUtilities.setUseFontMetricsGetStringBounds(false);
        BarChartDemo7 demo = new BarChartDemo7("Bar Chart Demo 7");
        demo.pack();
        RefineryUtilities.centerFrameOnScreen(demo);
        demo.setVisible(true);

    }

}