JFreeChart

用JFreeChart实现折线图package com.lei.jfreechart;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JFreeChartpublic 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 legendtrue, // tooltipsfalse // 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;}}