JfreeChart画图折线

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package test;
import javax.swing.JFrame;
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.RefineryUtilities;

public class LineCharts extends JFrame {

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

public static void main(String[] args) {
LineCharts fjc = new LineCharts("业务发生规律图");
fjc.pack();
RefineryUtilities.centerFrameOnScreen(fjc);
fjc.setVisible(true);

}
// 生成图表主对象JFreeChart
public static JFreeChart createChart(DefaultCategoryDataset linedataset) {
//定义图表对象
JFreeChart chart = ChartFactory.createLineChart("业务发生规律图", // chart title 标题
    "年", // domain axis label X轴
    "数量", // range axis label Y轴
    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);
System.out.println("这是=="+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 = "2011年";
String type2 = "2012年";
String type3 = "2013年";
String type4 = "2014年";
String type5 = "2015年";

linedataset.addValue(0.0, series1, type1);
linedataset.addValue(4.2, series1, type2);
linedataset.addValue(3.9, series1, type3);
linedataset.addValue(5.6, series1, type4);
linedataset.addValue(10.5, series1, type5);

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

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