JFreeChart绘制时序图示例

//RealTimeChart .java  import java.awt.BorderLayout;import java.awt.Font;import java.io.FileNotFoundException;import java.io.FileReader;import java.util.ArrayList;import java.util.List;import javax.swing.JFrame;import org.jfree.chart.ChartFactory;import org.jfree.chart.ChartPanel;import org.jfree.chart.JFreeChart;import org.jfree.chart.StandardChartTheme;import org.jfree.chart.axis.ValueAxis;import org.jfree.chart.plot.XYPlot;import org.jfree.data.time.Millisecond;import org.jfree.data.time.TimeSeries;import org.jfree.data.time.TimeSeriesCollection;public class RealTimeChart extends ChartPanel implements Runnable {private static TimeSeries timeSeries;private long value = 0;String dataPath=null;int samplingRate=100;public RealTimeChart(String chartContent, String title, String yaxisName,String dataPath) {super(createChart(chartContent, title, yaxisName));this.dataPath=dataPath;}public static double[] getDataFromFile(String fileURL) {FileReader reader;List<Double> list = new ArrayList<Double>();StringBuffer sb = new StringBuffer();try {reader = new FileReader(fileURL);int b;while ((b = reader.read()) != -1) {sb.append((char) b);}reader.close();} catch (FileNotFoundException e) {e.printStackTrace();} catch (Exception e) {e.printStackTrace();}String dataString = null;if (sb != null) {dataString = sb.toString().trim();}// 将读到的数据存入字符串数组中String dataArray[] = dataString.split(" ");// 去除数组中的数据前后空格for (int i = 0; i < dataArray.length; i++) {dataArray[i] = dataArray[i].trim();}// 解析字符串数组，得到对应的数字for (int i = 0; i < dataArray.length; i++) {// 数据不为"" ," ",null才作解析if (!"".equals(dataArray[i]) && !" ".equals(dataArray[i])&& !dataArray[i].equals(null)) {double d = Double.parseDouble(dataArray[i]);list.add(new Double(d));}}double dataArrayD[] = new double[list.size()];for (int i = 0; i < list.size(); i++) {double dtemp=list.get(i).doubleValue();dtemp=(int)(dtemp*10000)/10000;dataArrayD[i] = dtemp;}return dataArrayD;}@SuppressWarnings("deprecation")private static JFreeChart createChart(String chartContent, String title,String yaxisName) {// ////////--------------------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);// ////////--------------------// 创建时序图对象timeSeries = new TimeSeries(chartContent, Millisecond.class);TimeSeriesCollection timeseriescollection = new TimeSeriesCollection(timeSeries);JFreeChart jfreechart = ChartFactory.createTimeSeriesChart(title,"时间(秒)", yaxisName, timeseriescollection, false, true, false);XYPlot xyplot = jfreechart.getXYPlot();// 纵坐标设定,getDomainAxis()得到横轴ValueAxis valueaxis = xyplot.getDomainAxis();// 自动设置数据轴数据范围valueaxis.setAutoRange(true);// 数据轴固定数据范围 30svalueaxis.setFixedAutoRange(80000D);//getRangeAxis()得到纵轴valueaxis = xyplot.getRangeAxis();// valueaxis.setRange(0.0D,200D);//这句设置纵坐标范围，没有则默认纵坐标自动变换return jfreechart;}public void run() {while (true) {try {for (double i = 0; i < 2 * Math.PI; i = i + 0.1) {timeSeries.add(new Millisecond(),  getDataFromFile(dataPath)[getDataFromFile(dataPath).length-1]);Thread.sleep(200);//}} catch (InterruptedException e) {}}}public static void main(String[] args) {String dataPath="C:\\Users\\Mao\\Desktop\\chanel0-index0.txt";JFrame frame = new JFrame("Test Chart");RealTimeChart rtcp = new RealTimeChart("随机数", "随机数", "数值",dataPath);frame.getContentPane().add(rtcp, new BorderLayout().CENTER);frame.pack();frame.setVisible(true);(new Thread(rtcp)).start();frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);}}