JfreeChart 散点图

 

用JfreeChart画散点图

 首先，看画图的API，参数有：

ChartFactory.createScatterPlot（），其中，有一个xydataset，那么，我们先要知道这个xydataset是什么结构的，再看所需xydataset，散点图，也就是单独画出点，也就是一个二维数据了，x ，y坐标嘛！

那么，先做好准备工作，第一步，拿数据，这就不用啰嗦了，就是得到一个List也好，Set也行。

 

第二步，加载到数据集：

/**
 *
 * @param xydatalist
 * @param bloods
 * @return
 */
    public static XYDataset createxydataset(List<PressureBean> xydatalist,
            String bloods) {
        DefaultXYDataset xydataset = new DefaultXYDataset();

        int size = xydatalist.size();
        double[][] datas = new double[2][size];
        for (int i = 0; i < size; i++) {
            PressureBean pres = xydatalist.get(i);
            int sys = pres.getSyspress();//收缩压
            int dia = pres.getDiapress();//舒张压

            datas[0][i] = sys;
            datas[1][i] = dia;
        }

        xydataset.addSeries(bloods, datas);

        return xydataset;

    }

 

下一步，另外一个准备工作，画图方法：

public static JFreeChart createChart(XYDataset xydataset,
            String bloodcattile, String shou, String shu, String nobloodData,
            String bloods, String nomal, String fore, String one, String two,
            List<PressureBean> list, Log log) {

        // 有可能用户在后面的版本中故意输入不正常数值，但是为了保证图片画图的完整，这里先计算
        // 用户血压值的最大值。
        int maxpress = 160;
        int addmax = 20;

        if (list != null && list.size() > 0) {

            Iterator<PressureBean> it = list.iterator();
            while (it.hasNext()) {
                PressureBean pres = it.next();

                if (maxpress < pres.getDiapress()) {
                    maxpress = pres.getDiapress();
                }

                if (maxpress < pres.getSyspress()) {
                    maxpress = pres.getSyspress();
                }
            }

            maxpress += addmax;


            log.info("high press value is =" + maxpress);

        }

        JFreeChart jfreechart = ChartFactory.createScatterPlot(bloodcattile,
                shou, shu, xydataset, PlotOrientation.VERTICAL, true, false,
                false);
        jfreechart.setBackgroundPaint(Color.white);
        jfreechart.setBorderPaint(Color.GREEN);
        jfreechart.setBorderStroke(new BasicStroke(1.5f));
        XYPlot xyplot = (XYPlot) jfreechart.getPlot();
        xyplot.setNoDataMessage(nobloodData);
        xyplot.setNoDataMessageFont(new Font("", Font.BOLD, 14));
        xyplot.setNoDataMessagePaint(new Color(87, 149, 117));

        xyplot.setBackgroundPaint(new Color(255, 253, 246));
        ValueAxis vaaxis = xyplot.getDomainAxis();
        vaaxis.setAxisLineStroke(new BasicStroke(1.5f));

        ValueAxis va = xyplot.getDomainAxis(0);
        va.setAxisLineStroke(new BasicStroke(1.5f));

        va.setAxisLineStroke(new BasicStroke(1.5f)); // 坐标轴粗细
        va.setAxisLinePaint(new Color(215, 215, 215)); // 坐标轴颜色
        xyplot.setOutlineStroke(new BasicStroke(1.5f)); // 边框粗细
        va.setLabelPaint(new Color(10, 10, 10)); // 坐标轴标题颜色
        va.setTickLabelPaint(new Color(102, 102, 102)); // 坐标轴标尺值颜色
        ValueAxis axis = xyplot.getRangeAxis();
        axis.setAxisLineStroke(new BasicStroke(1.5f));

        XYLineAndShapeRenderer xylineandshaperenderer = (XYLineAndShapeRenderer) xyplot
                .getRenderer();
        xylineandshaperenderer.setSeriesOutlinePaint(0, Color.WHITE);
        xylineandshaperenderer.setUseOutlinePaint(true);
        NumberAxis numberaxis = (NumberAxis) xyplot.getDomainAxis();
        numberaxis.setAutoRangeIncludesZero(false);
        numberaxis.setTickMarkInsideLength(2.0F);
        numberaxis.setTickMarkOutsideLength(0.0F);
        numberaxis.setAxisLineStroke(new BasicStroke(1.5f));
        numberaxis.setUpperBound(maxpress);
        numberaxis.setLowerBound(60);//最小值设置为60
        NumberAxis numberaxis1 = (NumberAxis) xyplot.getRangeAxis();
        numberaxis1.setTickMarkInsideLength(2.0F);
        numberaxis1.setTickMarkOutsideLength(0.0F);
        numberaxis1.setUpperBound(105d);
        numberaxis1.setLowerBound(35);
        numberaxis1.setAxisLineStroke(new BasicStroke(1.5f));

        // if (xydataset != null) {
        XYBoxAnnotation box = new XYBoxAnnotation(0, 0, 89, 59); //正常血压所在区域内边界
        XYBoxAnnotation box1 = new XYBoxAnnotation(0, 0, 119, 79);//高血压前期所在区域内边界
        XYBoxAnnotation box2 = new XYBoxAnnotation(0, 0, 139, 89);//高血压一期所在区域内边界
        XYBoxAnnotation box3 = new XYBoxAnnotation(0, 0, 159, 99);//高血压二期所在区域内边界
        XYTextAnnotation text1 = new XYTextAnnotation(nomal, 70, 62.5);//标识“正常”
        XYTextAnnotation text = new XYTextAnnotation(fore, 70, 82.5);//“高血压前期”
        XYTextAnnotation text2 = new XYTextAnnotation(one, 70, 91.5);//“高血压一期”
        XYTextAnnotation text3 = new XYTextAnnotation(two, 70, 101.5);//“高血压二期”


        //将上面的边界线条，说明文字加入到xyplot中。
        xyplot.addAnnotation(box);
        xyplot.addAnnotation(box1);
        xyplot.addAnnotation(box2);
        xyplot.addAnnotation(box3);

        xyplot.addAnnotation(text);
        xyplot.addAnnotation(text1);
        xyplot.addAnnotation(text2);
        xyplot.addAnnotation(text3);
        // }
        return jfreechart;
    }

 

最后一步,返回图片URL

public static void drawScatterChart(IrisIoInterface io, Log log,
            XYDataset xydataSet, String title, String shou, String shu,
            String nodata, String boolds, String nomal, String fore,
            String one, String two, List<PressureBean> list) {

        JFreeChart chart = createChart(xydataSet, title, shou, shu, nodata,
                boolds, nomal, fore, one, two, list, log);

        HttpServletRequest request = io.getRequest();
        String filename = "";
        String graphURL = "";
        try {
            filename = ServletUtilities.saveChartAsPNG(chart, 400, 300, null,
                    io.getSession());
            graphURL = request.getContextPath() + "/displayChart?filename="
                    + filename;
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
            log.error(e);
        }

        io.setData("filename", filename, BeanShare.BEAN_SHARE_REQUEST);
        io.setData("scatterurl", graphURL, BeanShare.BEAN_SHARE_REQUEST);

    }

 

效果图：

Copy:

http://juliana-only.iteye.com/blog/544104