折线图的一个例子

java 代码

/**
 * @{#} LineChart.java Create on 2007-11-6 下午04:28:27
 *
 * Copyright (c) 2007 by KUBAO.
 */
package test;

import java.awt.Color;
import java.awt.geom.Rectangle2D;

import org.jfree.chart.ChartFactory;
import org.jfree.chart.ChartFrame;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.axis.NumberAxis;
import org.jfree.chart.labels.StandardCategoryItemLabelGenerator;
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.data.general.DefaultPieDataset;

/**
 * @author <a href="mailto:[e-mail]">wanghb</a>
 * @version 1.0
 */
public class LineChart{
public LineChart() {
}

public static void main(String[] args){

//  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";
    String type4 = "4月";
    String type5 = "5月";
    String type6 = "6月";
    String type7 = "7月";
    String type8 = "8月";


//  建立dataset
    DefaultCategoryDataset dataset = new DefaultCategoryDataset();
//  以下可以动态添加数据
    dataset.addValue(1.3, series1, type1);
    dataset.addValue(4.2, series1, type2);
    dataset.addValue(3.9, series1, type3);
    dataset.addValue(5.5, series1, type4);
    dataset.addValue(5.3, series1, type5);
    dataset.addValue(7.1, series1, type6);
    dataset.addValue(7.9, series1, type7);
    dataset.addValue(9.0, series1, type8);

    dataset.addValue(5.3, series2, type1);
    dataset.addValue(7.1, series2, type2);
    dataset.addValue(6.6, series2, type3);
    dataset.addValue(8.0, series2, type4);
    dataset.addValue(4.8, series2, type5);
    dataset.addValue(4.5, series2, type6);
    dataset.addValue(3.7, series2, type7);
    dataset.addValue(4.2, series2, type8);

    dataset.addValue(4.3, series3, type1);
    dataset.addValue(6.4, series3, type2);
    dataset.addValue(3.5, series3, type3);
    dataset.addValue(4.0, series3, type4);
    dataset.addValue(3.6, series3, type5);
    dataset.addValue(3.9, series3, type6);
    dataset.addValue(2.5, series3, type7);
    dataset.addValue(3.1, series3, type8);
    dataset.addValue(4.0, "预警点", type4);
    dataset.addValue(6.4, "预警点", type2);
    dataset.addValue(4.3, "预警点2", type1);



//  建立chart
    JFreeChart chart = ChartFactory.createLineChart(
        "2005年家电商品销售曲线图",       // chart title
        "时间",                    // domain axis label
        "销售额(百万)",                   // range axis label
        dataset,                   // data
        PlotOrientation.VERTICAL,  // orientation
        true,                      // include legend
        true,                      // tooltips
        false                      // urls
    );

//   NOW DO SOME OPTIONAL CUSTOMISATION OF THE CHART...
    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);

    LineAndShapeRenderer renderer = (LineAndShapeRenderer) plot.getRenderer();
//  renderer.setBaseShape(new Rectangle2D.Double(-1.5, -1.5, 3, 3), true);  //设置点
    renderer.setShape(new Rectangle2D.Double(-1.5, -1.5, 3, 3));
    renderer.setShapesVisible(true);
    renderer.setSeriesPaint(3,Color.red);
    renderer.setSeriesLinesVisible(3,false);


    renderer.setItemLabelGenerator(new StandardCategoryItemLabelGenerator());//显示折点数据
    renderer.setItemLabelsVisible(true);

    ChartFrame pieFrame = new ChartFrame("折线图预警图",chart);
    pieFrame.pack();
    pieFrame.setVisible(true);
}
}

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