jfreeChart折线图，如何显示节点数据呢？

java8004 2011-10-16 11:18:07

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风尘中国 2011-10-17

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import java.awt.*;

import java.awt.geom.Rectangle2D;



import org.jfree.chart.ChartFactory;

import org.jfree.chart.ChartPanel;

import org.jfree.chart.JFreeChart;

import org.jfree.chart.labels.StandardXYItemLabelGenerator;

import org.jfree.chart.labels.ItemLabelAnchor;

import org.jfree.chart.labels.ItemLabelPosition;

import org.jfree.chart.title.TextTitle;

import org.jfree.chart.axis.NumberAxis;

import org.jfree.chart.plot.*;

import org.jfree.chart.renderer.category.LineAndShapeRenderer;

import org.jfree.chart.renderer.xy.XYItemRenderer;

import org.jfree.chart.renderer.xy.XYLineAndShapeRenderer;

import org.jfree.data.category.CategoryDataset;

import org.jfree.data.category.DefaultCategoryDataset;

import org.jfree.data.time.Month;

import org.jfree.data.time.TimeSeries;

import org.jfree.data.time.TimeSeriesCollection;

import org.jfree.ui.ApplicationFrame;

import org.jfree.ui.RefineryUtilities;

import org.jfree.ui.TextAnchor;

import org.jfree.ui.RectangleInsets;



/**

 * A line chart demo showing the use of a custom drawing supplier.

 *

 */

public class LineChartDemo2 extends ApplicationFrame

{



    /**

     * Creates a new demo.

     *

     * @param title the frame title.

     */

    public LineChartDemo2(final String title)

    {

        super(title);

        TimeSeries timeSeries = new TimeSeries("阿蜜果blog访问量统计", Month.class);

//时间曲线数据集合

        TimeSeriesCollection lineDataset = new TimeSeriesCollection();

//构造数据集合

        timeSeries.add(new Month(1, 2007), 11200);

        timeSeries.add(new Month(2, 2007), 9000);

        timeSeries.add(new Month(3, 2007), 6200);

        timeSeries.add(new Month(4, 2007), 8200);

        timeSeries.add(new Month(5, 2007), 8200);

        timeSeries.add(new Month(6, 2007), 12200);

        timeSeries.add(new Month(7, 2007), 13200);

        timeSeries.add(new Month(8, 2007), 8300);

        timeSeries.add(new Month(9, 2007), 12400);

        timeSeries.add(new Month(10, 2007), 12500);

        timeSeries.add(new Month(11, 2007), 13600);

        timeSeries.add(new Month(12, 2007), 12500);



        lineDataset.addSeries(timeSeries);

        JFreeChart chart = ChartFactory.createTimeSeriesChart("访问量统计时间线", "月份", "访问量", lineDataset, true, true, true);

//设置子标题

        TextTitle subtitle = new TextTitle("2007年度", new Font("黑体", Font.BOLD, 12));

        chart.addSubtitle(subtitle);

//设置主标题

        chart.setTitle(new TextTitle("阿蜜果blog访问量统计", new Font("隶书", Font.ITALIC, 15)));

        chart.setAntiAlias(true);



        XYPlot plot = (XYPlot) chart.getPlot();

        XYLineAndShapeRenderer xylineandshaperenderer = (XYLineAndShapeRenderer)plot.getRenderer();

//设置网格背景颜色

        plot.setBackgroundPaint(Color.white);

//设置网格竖线颜色

        plot.setDomainGridlinePaint(Color.pink);

//设置网格横线颜色

        plot.setRangeGridlinePaint(Color.pink);

//设置曲线图与xy轴的距离

        plot.setAxisOffset(new RectangleInsets(0D, 0D, 0D, 10D));

//设置曲线是否显示数据点

        xylineandshaperenderer.setBaseShapesVisible(true);

//设置曲线显示各数据点的值

        XYItemRenderer xyitem = plot.getRenderer();

        xyitem.setBaseItemLabelsVisible(true);

        xyitem.setBasePositiveItemLabelPosition(new ItemLabelPosition(ItemLabelAnchor.OUTSIDE12, TextAnchor.BASELINE_LEFT));



        //下面三句是对设置折线图数据标示的关键代码

        xyitem.setBaseItemLabelGenerator(new StandardXYItemLabelGenerator());

        xyitem.setBaseItemLabelFont(new Font("Dialog", 1, 14));

        plot.setRenderer(xyitem);





        final ChartPanel chartPanel = new ChartPanel(chart);

        chartPanel.setPreferredSize(new Dimension(500, 270));

        setContentPane(chartPanel);



    }



    /**

     * Starting point for the demonstration application.

     *

     * @param args ignored.

     */

    public static void main(final String[] args){



        final LineChartDemo2 demo = new LineChartDemo2("Line Chart Demo 5");

        demo.pack();

        RefineryUtilities.centerFrameOnScreen(demo);

        demo.setVisible(true);



    }



}