update my chart

[riadhhwajdii]

hi
i succeded to show a graph using JFreeChart library
My problem is that i have dynamic data to show on the graph, every periode of time i had new data
hiow can i update my graph when receiving new data
please help me?

[vigneshb]

if its DefaultCategoryDataset just use setValue on your dataSet and if its a timeseries then all you have to do is use TimeSeriesCollection.add() . The listeners will be called as you update or add.

[riadhhwajdii]

i am using timeseries but the update is not done
there is my code:

Code: Select all

	
	public TestJfreeChart()
	{
		
	}
	
		public String generateChartMethod(){
		
		 JFreeChart chart = ChartFactory.createTimeSeriesChart( 
	                "Test",  	// title 
	                "Date",		// x-axis label 
	                "Nombre",   // y-axis label 
	                getDataset(),	// data 
	                true,       // create legend? 
	                true,       // generate tooltips? 
	                false       // generate URLs? 
	        		); 
		 
		 XYPlot plot = chart.getXYPlot();
		 plot.setBackgroundPaint(Color.white);
		 plot.setDomainGridlinePaint(Color.GRAY);
		 plot.setRangeGridlinePaint(Color.GRAY);
		 HttpSession s=SessionUtil.getSession();
		 String adressePagesWeb=s.getServletContext().getRealPath("/")+"pages/";
	 
		 try {
		     File file1 = new File(adressePagesWeb+"piechart.png");
             ChartUtilities.saveChartAsPNG(file1, chart, 600, 400, null);
                    } catch (Exception e) {

             e.printStackTrace();
         }
         return "jfreechart";
		}
	
	
	public XYDataset getDataset() {
		
		HttpSession session=SessionUtil.getSession();
		TimeSeriesCollection dataset;
		try{
			 dataset=(TimeSeriesCollection)session.getAttribute("jfreechart");
			 dataset.toString();
		}catch(NullPointerException e)
		{
			dataset=new TimeSeriesCollection();
			TimeSeries s3 = new TimeSeries("Series 3");
		       s3.add(new Minute(1,new Hour()),5);
		        s3.add(new Minute(2,new Hour()),7);
		        s3.add(new Minute(3,new Hour()),8);
		        s3.add(new Minute(4,new Hour()),10);
		        s3.add(new Minute(5,new Hour()),20);
		        s3.add(new Minute(6,new Hour()),50);
		        s3.add(new Minute(7,new Hour()),55);
		        s3.add(new Minute(8,new Hour()),100);
		        s3.add(new Minute(22,new Hour()),150);
		        s3.add(new Minute(23,new Hour()),400);
		        s3.add(new Minute(35,new Hour()),450);
		        s3.add(new Minute(55,new Hour()),100);
	       dataset.addSeries(s3);
	         session.setAttribute("jfreechart",dataset);
		}
		
		return dataset;
	}

	public void setDataset(XYDataset dataset) {
		this.dataset = dataset;
	}
		public void update()
		{
			HttpSession session=SessionUtil.getSession();
			TimeSeriesCollection dataset;
			Calendar calendrier = Calendar.getInstance();
			int min=calendrier.MINUTE;
			dataset=(TimeSeriesCollection)session.getAttribute("jfreechart");
			
			try{
				dataset.getSeries(0).add(new Minute(59,new Hour()),600);
				session.setAttribute("jfreechart",dataset);
				generateChartMethod();
				}catch(Exception e){
				System.out.println("erreur lors du mise à jour du graph");
			e.printStackTrace();
			}
		}
		public void datasetChanged(DatasetChangeEvent arg0) {
		}

	
}
please help me

[paradoxoff]

please continue here.