Java tutorial
/* =========================================================== * WFDB Java : Interface to WFDB Applications. * * =========================================================== * * (C) Copyright 2012, by Ikaro Silva * * Project Info: * Code: http://code.google.com/p/wfdb-java/ * WFDB: http://www.physionet.org/physiotools/wfdb.shtml * * This program is free software: you can redistribute it and/or modify * it under the terms of the GNU Lesser General Public License as published by * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public License * along with this program. If not, see <http://www.gnu.org/licenses/>. * * * * Original Author: Ikaro Silva * Contributor(s): -; * * Changes * ------- * Check: http://code.google.com/p/wfdb-java/list */ /* Example on how to plot a ECG signal * * This example requires the package jfreechar-1.0.14.jar * * Available for download at in the download area of the wfdb-java Google project: * * http://code.google.com/p/wfdb-java/downloads/detail?name=jfreechart-1.0.14.zip&can=2&q= * * To install external package in Eclipse from a working "wfdb-java" project: * * 1. Right click in the "src" folder under the wfdb-java project in Eclipse * * 2. Select: * Build Path -> Configure Build Path * * 3. Go to: * "Libraries" Tab -> Add External Jars * * select the jfreechar-1.0.14.jar and hit "Ok". * * 4. Go to the "Order and Export" Tab, check "jfreechar-1.0.14.jar" and hit "Ok". */ package org.physionet.wfdb.examples; import java.util.ArrayList; import javax.swing.JPanel; import org.jfree.chart.ChartFactory; import org.jfree.chart.ChartPanel; import org.jfree.chart.JFreeChart; import org.jfree.chart.plot.PlotOrientation; import org.jfree.chart.plot.XYPlot; import org.jfree.chart.renderer.xy.XYItemRenderer; import org.jfree.chart.renderer.xy.XYLineAndShapeRenderer; import org.jfree.data.xy.XYDataset; import org.jfree.data.xy.XYSeries; import org.jfree.data.xy.XYSeriesCollection; import org.jfree.ui.ApplicationFrame; import org.jfree.ui.RefineryUtilities; import org.physionet.wfdb.Rdann; import org.physionet.wfdb.Rdsamp; import org.physionet.wfdb.ecg.Wqrs; public class PlotECGQRSDemo2 extends ApplicationFrame { public PlotECGQRSDemo2(String title) { super(title); JPanel chartPanel = createDemoPanel(); chartPanel.setPreferredSize(new java.awt.Dimension(500, 270)); setContentPane(chartPanel); } private static JFreeChart createChart(XYDataset dataset) { // create the chart... JFreeChart chart = ChartFactory.createXYLineChart("Plot ECG Demo1 ", // chart title "Time (seconds)", // x axis label "mV", // y axis label dataset, // data PlotOrientation.VERTICAL, true, // include legend true, // tooltips false // urls ); XYPlot plot = (XYPlot) chart.getPlot(); plot.getDomainAxis().setLowerMargin(0.0); plot.getDomainAxis().setUpperMargin(0.0); XYItemRenderer r = plot.getRenderer(); if (r instanceof XYLineAndShapeRenderer) { XYLineAndShapeRenderer renderer = (XYLineAndShapeRenderer) r; renderer.setSeriesLinesVisible(1, false); renderer.setSeriesShapesVisible(1, true); renderer.setSeriesShapesFilled(1, true); } return chart; } public static XYDataset createDataset() { XYSeriesCollection result = new XYSeriesCollection(); XYSeries ecgSignal = new XYSeries(1); XYSeries ecgAnnotation = new XYSeries(2); String recordName = "mitdb/100"; int N = 5000; Double mxEcg = (double) 0; //Get ECG data from WFDB in number of samples Rdsamp rdsampexec = new Rdsamp(); rdsampexec.setArgumentValue(Rdsamp.Arguments.stopTime, "s" + N); //Print time in second and values in high precision rdsampexec.setArgumentValue(Rdsamp.PrintTimeFormatLabel.P); rdsampexec.setArgumentValue(Rdsamp.Arguments.recordName, recordName); ArrayList[] results = rdsampexec.execTo2DString(); //Insert data into plotting series Double ecgSamp; for (int n = 0; n < results[1].size(); n++) { ecgSamp = Double.valueOf((String) results[1].get(n)); ecgSignal.add(n, ecgSamp); mxEcg = (mxEcg > ecgSamp) ? mxEcg : ecgSamp; } result.addSeries(ecgSignal); //Get the QRS annotations Wqrs wqrsExec = new Wqrs(); wqrsExec.setArgumentValue(Wqrs.Arguments.recordName, recordName); wqrsExec.setArgumentValue(Wqrs.Arguments.stopTime, "s" + N); wqrsExec.execToString(); //The annotation file will be stored at the current directory (./mitdb/100.wqrs) //Use RDANN to read the annotation file and store values in memory Rdann rdannExec = new Rdann(); rdannExec.setArgumentValue(Rdann.Arguments.annotator, "wqrs"); rdannExec.setArgumentValue(Rdann.Arguments.recordName, recordName); ArrayList<String> annotations = rdannExec.execToStringList(); String[] tmpArr; for (String temp : annotations) { tmpArr = temp.split("\\s+"); ecgAnnotation.add(Double.valueOf(tmpArr[2]), mxEcg); } result.addSeries(ecgAnnotation); return result; } /** * Creates a panel for the demo (used by SuperDemo.java). * * @return A panel. */ public static JPanel createDemoPanel() { JFreeChart chart = createChart(createDataset()); return new ChartPanel(chart); } /** * Starting point for the demonstration application. * * @param args ignored. */ public static void main(String[] args) { PlotECGQRSDemo2 demo = new PlotECGQRSDemo2("Plot ECG Demo1"); demo.pack(); RefineryUtilities.centerFrameOnScreen(demo); demo.setVisible(true); } }