java jfreechart 折线图_java程序使用JfreeChart画折线图

一段简单的使用JfreeChart绘制折线图的java程序实现一个小例子。

package org.ncut.decloud.linecharts;

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 LineCharts extends ApplicationFrame {

/** * */

private static final long serialVersionUID = 1L;

public LineCharts(String s) {

super(s);

setContentPane(createDemoLine());

}

public static void main(String[] args) {

LineCharts fjc = new LineCharts("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("一季度销售曲线", // 折线图名称

"时间", // 横坐标名称

"销售额(百万)", // 纵坐标名称

linedataset, // 数据

PlotOrientation.VERTICAL, // 水平显示图像

true, // include legend

true, // tooltips

false // urls

);

CategoryPlot plot = chart.getCategoryPlot();

plot.setRangeGridlinesVisible(true); // 是否显示格子线

plot.setBackgroundAlpha(0.3f); // 设置背景透明度

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;

}

}

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