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