折线图

package com.chart;
import javax.swing.JPanel; 


import org.jfree.chart.ChartFactory;
import org.jfree.chart.ChartPanel;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.axis.NumberAxis;
import org.jfree.chart.plot.CategoryPlot;
import org.jfree.chart.plot.PlotOrientation;
import org.jfree.data.category.DefaultCategoryDataset;
import org.jfree.ui.ApplicationFrame;
import org.jfree.ui.RefineryUtilities; 


public class Line extends ApplicationFrame { 


 public Line(String s) {
  super(s);
  setContentPane(createDemoLine());
 } 


 public static void main(String[] args) {
  Line fjc = new Line("折线图");
  fjc.pack();
  RefineryUtilities.centerFrameOnScreen(fjc);
  fjc.setVisible(true); 


 } 


 // 生成显示图表的面板
 public static JPanel createDemoLine() {
  JFreeChart jfreechart = createChart(createDataset());
  return new ChartPanel(jfreechart);
 } 


 // 生成图表主对象JFreeChart
 public static JFreeChart createChart(DefaultCategoryDataset linedataset) {
  //定义图表对象
  JFreeChart chart = ChartFactory.createLineChart("折线图", // chart title
    "时间", // domain axis label
    "销售额(百万)", // range axis label
    linedataset, // data
    PlotOrientation.VERTICAL, // orientation
    true, // include legend
    true, // tooltips
    false // urls
    );
  CategoryPlot plot = chart.getCategoryPlot();
  // customise the range axis...
  NumberAxis rangeAxis = (NumberAxis) plot.getRangeAxis();
  rangeAxis.setStandardTickUnits(NumberAxis.createIntegerTickUnits());
  rangeAxis.setAutoRangeIncludesZero(true);
  rangeAxis.setUpperMargin(0.20);
  rangeAxis.setLabelAngle(Math.PI / 2.0); 


  return chart;
 } 


 //生成数据
 public static DefaultCategoryDataset createDataset() {
  DefaultCategoryDataset linedataset = new DefaultCategoryDataset();
  //  各曲线名称
  String series1 = "冰箱";
  String series2 = "彩电";
  String series3 = "洗衣机"; 


  //    横轴名称(列名称)
  String type1 = "1月";
  String type2 = "2月";
  String type3 = "3月"; 


  linedataset.addValue(0.0, series1, type1);
  linedataset.addValue(4.2, series1, type2);
  linedataset.addValue(3.9, series1, type3); 


  linedataset.addValue(1.0, series2, type1);
  linedataset.addValue(5.2, series2, type2);
  linedataset.addValue(7.9, series2, type3); 


  linedataset.addValue(2.0, series3, type1);
  linedataset.addValue(9.2, series3, type2);
  linedataset.addValue(8.9, series3, type3); 


  return linedataset;
 } 


}