jfreechart

How can I listen to JFreeChart's zoom reset event? I did it using this: ChartPanel DCP=new ChartPanel(DailyChart){ @Override public void restoreAutoBounds(){ super.restoreAutoDomainBounds(); super.restoreAutoRangeBounds(); XYPlot plot=(XYPlot)getChart().getPlot(); Calendar Cal=Calendar.getInstance(); String dayName=Cal.getDisplayName(Calendar.DAY_OF_WEEK,Calendar.SHORT,new Locale("en", "us")).toLowerCase(); String tmp[]=((String)Configurations.getWeeklyWorkingSchedule().get(dayName).get("start")).split(":"); Cal.set(Calendar.HOUR_OF_DAY, Integer.parseInt(tmp[0])); Cal.set(Calendar.MINUTE,

i've created a BarChart using jfreechart in java. The bar is plotted according to the days in a month. for example this month March contains 31 days, so there will be 31 bars . The problem is that when i click the next button the month changes to April which contains 30 days, ie 30 bars. How can we change the BarChart according to the days in a month on button click. Can anyone please tell me how to do that. trashgod You need to update your dataset with each change. I've added an updateDataset() method and called it in several key places. private void updateDataset() { dataset.clear(); for

I wrote these 2 lines of code to create a chart using an XYDataset : final XYDataset dataset = new TimeSeriesCollection(myInfo.getSeries()); JFreeChart timechart = ChartFactory.createTimeSeriesChart(myInfo.getName() + " CPU (last 72h)", "", "CPU %", dataset, false, false, false); These lines created this nice "last 72h" chart: This is how I added the information to build this chart (this piece of code can run multiple times): SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy-MM-dd H:mm:ss"); Date date = simpleDateFormat.parse(dateAsStringToParse); Second second = new Second(date);

Would someone please point me to a working example JFreeChart's XYSplineRenderer? Although I've never seen the example, XYSplineRendererDemo1.java is one that may be found among the demos . All the demos are included with the developer guide † , which I recommend highly. If you want to assay an example of your own, note that XYSplineRenderer is an XYLineAndShapeRenderer , so start with a matching ChartFactory . It looks like they all take an XYDataset . † Disclaimer: Not affiliated with Object Refinery Limited; just a satisfied customer and very minor contributor. 来源： https://stackoverflow.com

I have drawn multiple ellipses using a loop as shown below, and the results are perfect using one color for all the ellipses, but my target is to color each ellipse with different color. Is there any way to let the property Color.BLUE change its value in each iteration? for (int i = 0; i < 3; i++) { XYShapeAnnotation unitCircle1 = new XYShapeAnnotation( new Ellipse2D.Double((FinalArayOfOptpar[s][i] - Math.abs(FinalArayOfOptpar[s][i + 2])), (FinalArayOfOptpar[s][i + 1] - Math.abs(FinalArayOfOptpar[s][i + 3])), Math.abs(FinalArayOfOptpar[s][i + 2] * 2.0), Math.abs(FinalArayOfOptpar[s][i + 3] * 2

I'm trying to create a bar chart that generates a dataset from within a for loop. String scores = scoreText.getText(); String[] data = scores.split(","); DefaultCategoryDataset barChartDataset = null; for (int l = 0; l < data.length; l++) { barChartDataset = new DefaultCategoryDataset(); // barChartDataset.setValue(new Double(data[l]), "Scores", stu); barChartDataset.addValue(new Double(data[l]), "Scores", stu); System.out.println(data[l]); } JFreeChart barChart = ChartFactory.createBarChart3D("Summary", "Name", "Scores", barChartDataset, PlotOrientation.VERTICAL, false, true, false); The data

I have seen several examples of using a Servlet to dynamically generate a chart using JFreeChart, and subsequently including that image in a JSP using an img tag. For example: <img src="/MyChartServlet" width="400" height="300" border="0" alt="" /> My servlet which generates the image using JFreeChart works great, and I can see the image if I call it directly in the browser as in: http:/myurl/MyChartServlet?id=274 The problem is that my JSP does not display the image. In fact, the JSP is not even invoking the servlet. I know this because I do not see the debug entries in the log that appear