JFreeChart 画心电图

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public class func1 extends ApplicationFrame {    private static int length;    public func1(String string) {        super(string);        JPanel jpanel = createDemoPanel();        jpanel.setPreferredSize(new Dimension(500, 270));        setContentPane(jpanel);    }    public static void main(String[] args) throws IOException {        func1 linechartdemo1 = new func1("");        linechartdemo1.pack();        RefineryUtilities.centerFrameOnScreen(linechartdemo1);        linechartdemo1.setVisible(true);    }    /**     *      * @Description 创建面板     * @author 冯月     * @date Feb 27, 2017 4:03:02 PM     * @action createDemoPanel     * @return JPanel     */    public static JPanel createDemoPanel() {        JFreeChart jfreechart = createChart(createDataset());        try {            ChartUtilities.saveChartAsJPEG(new File("D:/ecg.png"), // 文件保存物理路径包括路径和文件名                    // 1.0f, //图片质量 ，0.0f~1.0f                    jfreechart, // 图表对象                    1920, // 图像宽度 ，这个将决定图表的横坐标值是否能完全显示还是显示省略号                    1080);        } catch (IOException e) {            e.printStackTrace();        }        return new ChartPanel(jfreechart);    }    /**     *      * @Description 配置     * @author 冯月     * @date Feb 25, 2017 2:15:10 PM     * @action createChart     * @return JFreeChart     */    private static JFreeChart createChart(CategoryDataset categorydataset) {        JFreeChart jfreechart = ChartFactory.createLineChart("", // 图表标题                "", // 主轴标签（x轴）                "", // 范围轴标签（y轴）                categorydataset, // 数据集                PlotOrientation.VERTICAL, // 方向                false, // 是否包含图例                false, // 提示信息是否显示                false);// 是否使用urls        CategoryPlot categoryplot = (CategoryPlot) jfreechart.getPlot();        categoryplot.setBackgroundPaint(Color.WHITE);        // 获取显示线条的对象        LineAndShapeRenderer lasp = (LineAndShapeRenderer) categoryplot.getRenderer();        // 设置线条颜色        lasp.setSeriesPaint(0, Color.BLUE);        categoryplot.setRangeGridlinePaint(Color.RED); // 设置纵向网格线红色        categoryplot.setDomainGridlinePaint(Color.RED); // 设置横向网格线红色        CategoryAxis domainAxis = categoryplot.getDomainAxis();        domainAxis.setMaximumCategoryLabelLines(1000);        domainAxis.setLowerMargin(0.0); // 设置距离图片左端距离        domainAxis.setUpperMargin(0.0); // 设置距离图片右端距离        // 设置背景线为实线        categoryplot.setDomainGridlineStroke(new BasicStroke(1.0f));        categoryplot.setRangeGridlineStroke(new BasicStroke(1.0f));        // 去除Y轴标注        NumberAxis numAxis = (NumberAxis) categoryplot.getRangeAxis();        numAxis.setVisible(false);        return jfreechart;    }    /**     *      * @Description 获取数据源     * @author 冯月     * @date Feb 25, 2017 2:15:03 PM     * @action createDataset     * @return DefaultCategoryDataset     */    public static DefaultCategoryDataset createDataset() {        DefaultCategoryDataset dataset = new DefaultCategoryDataset();        byte[] array2;        try {            array2 = toByteArray2("C:/Users/joker/Desktop/ecg.txt");            short[] convertRawData = utils.convertRawData(array2);            length = convertRawData.length;            System.out.println(length);            for (int i = 0; i < length; i++) {                dataset.addValue(convertRawData[i], "", String.valueOf(i));            }        } catch (IOException e) {            e.printStackTrace();        }        return dataset;    }    /**     *      * @Description 数据转换     * @author 冯月     * @date Feb 25, 2017 2:14:44 PM     * @action toByteArray2     * @return byte[]     */    public static byte[] toByteArray2(String filename) throws IOException {        File f = new File(filename);        if (!f.exists()) {            throw new FileNotFoundException(filename);        }        FileChannel channel = null;        FileInputStream fs = null;        try {            fs = new FileInputStream(f);            channel = fs.getChannel();            ByteBuffer byteBuffer = ByteBuffer.allocate((int) channel.size());            while ((channel.read(byteBuffer)) > 0) {                // do nothing                // System.out.println("reading");            }            return byteBuffer.array();        } catch (IOException e) {            e.printStackTrace();            throw e;        } finally {            try {                channel.close();            } catch (IOException e) {                e.printStackTrace();            }            try {                fs.close();            } catch (IOException e) {                e.printStackTrace();            }        }    }}

工具类

public class utils {    public static Byte[] toByteArray(List<Byte> input) {        Byte[] array = new Byte[input.size()];        input.toArray(array);        return array;    }    public static short[] convertRawData(byte[] input) {        short[] result = new short[input.length / 2];        for (int i = 0; i < result.length; i++) {            result[i] = (short) (((input[i * 2 + 1] & 0xff) << 8) | (input[i * 2] & 0xff));        }        return result;    }}

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