differencechartdemo1.java

在软件开发中用来绘制各种图表的源码

/* ------------------------
 * DifferenceChartDemo.java
 * ------------------------
 * (C) Copyright 2003-2005, by Object Refinery Limited.
 *
 */

package demo;

import java.awt.Color;

import javax.swing.JPanel;

import org.jfree.chart.ChartFactory;
import org.jfree.chart.ChartPanel;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.axis.DateAxis;
import org.jfree.chart.axis.ValueAxis;
import org.jfree.chart.plot.XYPlot;
import org.jfree.chart.renderer.xy.XYDifferenceRenderer;
import org.jfree.data.time.Day;
import org.jfree.data.time.TimeSeries;
import org.jfree.data.time.TimeSeriesCollection;
import org.jfree.data.xy.XYDataset;
import org.jfree.ui.ApplicationFrame;
import org.jfree.ui.RectangleInsets;
import org.jfree.ui.RefineryUtilities;

/**
 * A simple demonstration of the {@link XYDifferenceRenderer}.
 */
public class DifferenceChartDemo1 extends ApplicationFrame {

    /**
     * Creates a new demo.
     *
     * @param title  the frame title.
     */
    public DifferenceChartDemo1(String title) {

        super(title);
        XYDataset dataset = createDataset();
        JFreeChart chart = createChart(dataset);
        ChartPanel chartPanel = new ChartPanel(chart);
        chartPanel.setPreferredSize(new java.awt.Dimension(500, 270));
        setContentPane(chartPanel);

    }

    /**
     * Creates a sample dataset.
     * 
     * @return A sample dataset.
     */
    private static XYDataset createDataset() {
        TimeSeries series1 = new TimeSeries("Random 1");
        TimeSeries series2 = new TimeSeries("Random 2");
        double value1 = 0.0;
        double value2 = 0.0;
        Day day = new Day();
        for (int i = 0; i < 200; i++) {
            value1 = value1 + Math.random() - 0.5;
            value2 = value2 + Math.random() - 0.5;
            series1.add(day, value1);
            series2.add(day, value2);
            day = (Day) day.next();
        }

        TimeSeriesCollection dataset = new TimeSeriesCollection();
        dataset.addSeries(series1);
        dataset.addSeries(series2);
        return dataset;        
    }
    
    /**
     * Creates a chart.
     * 
     * @param dataset  the dataset.
     * 
     * @return The chart.
     */
    private static JFreeChart createChart(XYDataset dataset) {
        JFreeChart chart = ChartFactory.createTimeSeriesChart(
            "Difference Chart Demo 1",
            "Time", "Value",
            dataset,
            true,  // legend
            true,  // tool tips
            false  // URLs
        );
        chart.setBackgroundPaint(Color.white);
       
        XYPlot plot = chart.getXYPlot();
        plot.setRenderer(new XYDifferenceRenderer(
            Color.green, Color.red, false)
        );
        plot.setBackgroundPaint(Color.lightGray);
        plot.setDomainGridlinePaint(Color.white);
        plot.setRangeGridlinePaint(Color.white);
        plot.setAxisOffset(new RectangleInsets(5.0, 5.0, 5.0, 5.0));
        
        ValueAxis domainAxis = new DateAxis("Time");
        domainAxis.setLowerMargin(0.0);
        domainAxis.setUpperMargin(0.0);
        plot.setDomainAxis(domainAxis);
        plot.setForegroundAlpha(0.5f);  
        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(final String[] args) {

        DifferenceChartDemo1 demo = new DifferenceChartDemo1(
            "Difference Chart Demo 1"
        );
        demo.pack();
        RefineryUtilities.centerFrameOnScreen(demo);
        demo.setVisible(true);

    }

}