JFreeChart画折线图

代码如下

import java.awt.BasicStroke;
import java.awt.Color;
import java.awt.Font;
import java.awt.GradientPaint;
import java.io.File;
import java.io.IOException;

import javax.swing.JPanel;

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

public class CoreNeibor extends ApplicationFrame {

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

	public static void main(String[] args) {
		CoreNeibor fjc = new CoreNeibor("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) {
		//创建主题样式         
		StandardChartTheme standardChartTheme=new StandardChartTheme("CN");        
		//设置标题字体         
		standardChartTheme.setExtraLargeFont(new Font("隶书",Font.BOLD,20));        
		//设置图例的字体        
		standardChartTheme.setRegularFont(new Font("宋书",Font.PLAIN,15));        
		//设置轴向的字体       
		standardChartTheme.setLargeFont(new Font("宋书",Font.PLAIN,15));        
		//应用主题样式      
		ChartFactory.setChartTheme(standardChartTheme); 
		//定义图表对象
		JFreeChart chart = ChartFactory.createLineChart("折线图", // chart title
				"Eps", // domain axis label
				"", // range axis label
				linedataset, // data
				PlotOrientation.VERTICAL, // orientation
				true, // include legend
				true, // tooltips
				false // urls
				);
		chart.setBackgroundPaint(new GradientPaint(0,0,Color.white,500,0,Color.LIGHT_GRAY)); 
		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);
		plot.setForegroundAlpha(1.0f);
		plot.getRenderer().setSeriesPaint(0, Color.red) ;
		plot.getRenderer().setSeriesPaint(1, Color.blue) ;

		//获取折线对象 
		LineAndShapeRenderer renderer = (LineAndShapeRenderer) plot.getRenderer();         
		BasicStroke realLine = new BasicStroke(3.6f);       //设置实线 
		float dashes[] = { 8.0f };                      //定义虚线数组 
		BasicStroke brokenLine = new BasicStroke(3.6f,      //线条粗细 
				BasicStroke.CAP_SQUARE,             //端点风格 
				BasicStroke.JOIN_MITER,                 //折点风格 
				8.f,                                //折点处理办法 
				dashes,                         //虚线数组 
				0.0f);                          //虚线偏移量 
		renderer.setSeriesStroke(1, brokenLine);     //利用虚线绘制 

		renderer.setSeriesStroke(0, realLine);    //利用实线绘制 
		
		try {
			ChartUtilities.saveChartAsPNG(new File("E:/chart/CoreNeibor.jpg"), chart, 500, 500);
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		


		return chart;
	}

	//生成数据
	public static DefaultCategoryDataset createDataset() {
		DefaultCategoryDataset linedataset = new DefaultCategoryDataset();
		// 各曲线名称
		String series1 = "核心点数";
		String series2 = "簇数";

		//    横轴名称(列名称)
		String type1 = "0.1";
		String type2 = "0.2";
		String type3 = "0.25";
		String type4 = "0.3";
		String type5 = "0.4";

		linedataset.addValue(900, series1, type1);
		linedataset.addValue(1500, series1, type2);
		linedataset.addValue(2010, series1, type3);
		linedataset.addValue(2501, series1, type4);
		linedataset.addValue(3500, series1, type5);

		linedataset.addValue(300, series2, type1);
		linedataset.addValue(600, series2, type2);
		linedataset.addValue(800, series2, type3);
		linedataset.addValue(604, series2, type4);
		linedataset.addValue(590, series2, type5);


		return linedataset;
	}

}