Help please

[Guest]

Hello, everybody.

I want to resolve next issue:
I have JPanel and want to locate on this panel XYBarChart and XYLineChart.

Which data model I must use? Can I resolve this task using JFreeChart?
When I have learned Delphi in lyceum (11th form, and now I'm student of forth course) I remembered that built-in Delphi TChart component can do this (locate all types of data models in one component TChart).

Thanks a lot for any answering.

Best regards, Alex

P.S. Am I right using next code to resolve problem.

Code: Select all

public class BarChart extends JPanel {
    
       public BarChart(LinkedList classes) {
          XYBarDataset dataset = createDataset(classes);
          JFreeChart chart = createChart(dataset);
          chart = customizeChart(chart);
          ChartPanel chartPanel = new ChartPanel(chart);
          chartPanel.setPreferredSize(new Dimension(500, 270));
          add(chartPanel);
          setVisible(true);
       }
       
       private XYBarDataset createDataset(LinkedList classes) {
           XYSeriesCollection coll = new XYSeriesCollection();
           XYSeries series = new XYSeries("Relative Frequencies");
           for (int i = 0; i < classes.size(); i++) {              
               Class c = (Class)classes.get(i);
               series.add(c.getBegin(), c.getRelativeFrequency());
           }
           XYSeries relFreqSeries = new XYSeries("Next series");
           relFreqSeries.add(134, 123);
           relFreqSeries.add(135, 122);
           relFreqSeries.add(136, 121);
           relFreqSeries.add(137, 120);
           relFreqSeries.add(138, 124);
           relFreqSeries.add(139, 125);
           relFreqSeries.add(130, 126);
           
           coll.addSeries(series);
           coll.addSeries(relFreqSeries);
           
           XYBarDataset dataset = new XYBarDataset(coll,  ((Class)classes.get(0)).getEnd() - ((Class)classes.get(0)).getBegin());                     
          return dataset;
       }

       private JFreeChart createChart(final IntervalXYDataset dataset){
          JFreeChart chart = ChartFactory.createXYBarChart(
             "Class frequency", // chart title
             "Elements", // domain axis label
             /*"Frequencies"*/false, // range axis label
             "Frequencies",
             dataset, // data
             PlotOrientation.VERTICAL, // orientation
             true, // include legend
             true, // tooltips?
             false // URLs?
             );
          return chart;
       }

       private JFreeChart customizeChart(final JFreeChart chart){
          return chart;
       }
}

[Alex Manoylenko]

Help please!

[Birgi]

Alex,

You can create two ChartPanel's with your charts as parameters, and then add these to a JPanel.

example:

Code: Select all

ChartPanel cp1 = new ChartPanel(chart1);
ChartPanel cp2 = new ChartPanel(chart2);
...
JPanel panel = new JPanel();
... // panel properties
panel.add(cp1);
panel.add(cp2);
...

[Alex Manoylenko]

Thanks Birgi.

Maybe I haven't explained my problem simple.

I didn't want create two JPanel's I want to create one JPanel where I can build both bar chart and simple function (y = f(x)). AT THE SAME JPanel !!!

Is there way to do it?

Thanks a lot.

Best regards, Alex

[Alex Manoylenko]

Hi, everybody.

These are the issues that I want to resolve using JFreeChart library.
Can I do this?

a) I want to build bar chart and some functions (y1=f(x1), y2=g(x2), etc.) in one JFreeChart



b) I want to build step function (arrows on picture) and some functions



Any answer will be very appreciated.

Best regards, Alex

[Alex Manoylenko]

Help please!

I need your help.

A lot of thanks, Alex

[david.gilbert]

JFreeChart doesn't support functions, so you first need to convert your functions into a dataset containing (x, y) coordinates sampled from your function.

Once that is done, the general approach to overlaying two different types of charts on top of one another is to use multiple datasets. Each dataset has a separate renderer. Your first example could use two dataset, and an XYLineAndShapeRenderer to draw the 3 series that are represented as lines, and an XYBarRenderer to draw the series that is represented as a bar.

For your second example, again you would use 2 datasets and 2 renderers, and you would replace the XYBarRenderer with an XYStepRenderer (probably you would need to modify the source code to draw the arrows).

[Alex Manoylenko]

Hello, David.

Thanks a lot for your rapid answer.

I try to do this.
I think JFreeChart makes my life more buitiful

Best regards,
Alex

[Alex Manoylenko]

Hello, everybody!

I have some problem creating XYStepChart.

Here is source code:

Code: Select all

public class StepFunctionChart extends JPanel {
    
       public StepFunctionChart(LinkedList classes) {                                 
            XYSeriesCollection dataset = createDataset(classes);
            JFreeChart chart = createChart(dataset);
            chart = customizeChart(chart);
            ChartPanel chartPanel = new ChartPanel(chart);
            chartPanel.setPreferredSize(new Dimension(500, 270));
            add(chartPanel);
            setVisible(true);
       }
       
       private XYSeriesCollection createDataset(LinkedList classes) {
           
            XYSeries series = new XYSeries("Sum Polygon", false, true);
           
            for (int i = 0; i < classes.size(); i++) {              
                Class c = (Class)classes.get(i);
                XYDataItem data = new XYDataItem(c.getBegin(), c.getSumPolygon());
                series.add(data);
                data = new XYDataItem(c.getEnd(), c.getSumPolygon());
                series.add(data);
            }
           
            XYSeriesCollection xy = new XYSeriesCollection();
            xy.addSeries(series);  
            return xy;
       }

       private JFreeChart createChart(final XYSeriesCollection dataset){
           NumberAxis xAxis = new NumberAxis("Elements");
           NumberAxis yAxis = new NumberAxis("Sum polygon");
           
           XYStepRenderer renderer = new XYStepRenderer(new StandardXYToolTipGenerator(), null);
           XYPlot plot = new XYPlot(dataset, xAxis, yAxis, renderer);
           plot.setOrientation(PlotOrientation.VERTICAL);
           JFreeChart ch = new JFreeChart("Sum polygon", JFreeChart.DEFAULT_TITLE_FONT, plot, true);
          return ch;
       }

       private JFreeChart customizeChart(final JFreeChart chart){
          return chart;
       }
}

and I have next code that draws bar chart, both classes use specific data for building dataset, but I don't understand why first of this classes doesn't reproduse any result as you can see on the picture (second JPanel)

Code: Select all

 public class BarChart extends JPanel {
    
       public BarChart(VariationalSeries vs) {
          XYBarDataset dataset = createDataset(vs.getClasses());
          JFreeChart chart = createChart(dataset, vs);
          chart = customizeChart(chart);
          ChartPanel chartPanel = new ChartPanel(chart);
          chartPanel.setPreferredSize(new Dimension(500, 270));
          add(chartPanel);
          setVisible(true);
       }
       
       private XYBarDataset createDataset(LinkedList classes) {
            XYSeriesCollection coll = new XYSeriesCollection();
            XYSeries series = new XYSeries("Relative Frequencies");
            for (int i = 0; i < classes.size(); i++) {              
                Class c = (Class)classes.get(i);
                series.add(c.getBegin(), c.getRelativeFrequency());
            }
            coll.addSeries(series);
            XYBarDataset dataset = new XYBarDataset(coll, ((Class)classes.get(0)).getEnd() - ((Class)classes.get(0)).getBegin());
            return dataset;
       }

       private JFreeChart createChart(final IntervalXYDataset dataset, VariationalSeries vs/*LinkedList classes*/) {
          JFreeChart chart = ChartFactory.createXYBarChart(
             "Class frequency", // chart title
             "Elements", // domain axis label
             false, // range axis label
             "Frequencies",
             dataset, // data
             PlotOrientation.VERTICAL, // orientation
             true, // include legend
             true, // tooltips?
             false // URLs?
             );
             
            XYPlot plot = chart.getXYPlot();// .getCategoryPlot(); 
           XYSeries series = new XYSeries("", false, true);
           int temp = 0;
           
           for (int i = 0; i < vs.getElements().size(); i++) {
               double element = ((Double)(vs.getElements().get(i))).doubleValue();
               double estimatedRelFreq = ((Double)(vs.getEstimatedRelativeFrequencies().get(i))).doubleValue();
               XYDataItem data = new XYDataItem(element, estimatedRelFreq);
               series.add(data);      
           }
           
           System.out.println("POINTS:" + series.getItemCount());
           XYSeriesCollection xy = new XYSeriesCollection();
           xy.addSeries(series);  

            
            plot.setDataset(1, xy);
            
            XYLineAndShapeRenderer lineRenderer = new XYLineAndShapeRenderer(true,false); 
            plot.setRenderer(1, lineRenderer); 
            plot.setDatasetRenderingOrder(DatasetRenderingOrder.FORWARD);                                                     
          return chart;
       }

       private JFreeChart customizeChart(final JFreeChart chart){
          return chart;
       }
}

Picture (http://chartproject.nm.ru/toSend.jpg) :



Can somebody explain me, am I right to use this dataset (XYSeriesCollection) for creating right step chart.

Thanks a lot for any answer.

Best regards,
Alex

[Alex Manoylenko]

Hello, everybody!!!

Can somebody explain me which dataset I MUST use to create right step chart?

I use XYSeriesCollection but I can't see anything on my JPanel.
Am I right using this kind of dataset?

Thanks a lot.

I need your help.

Best regards,
Alex