For those who've used JClass Chart, how do I load data using a TableModel for x axis

[Meghna ks]

Hi
I've been using the JClass Chart and I load the data to the Chart by using a TableModel by extending the AbstractTableModel class. But the problem I'm facing is that only the values for the Y axis are generated according to the requirement whereas the X axis values are generated randomly by the Chart. If anyone has experimented with this before, please do let me know.This is an important requirement and I'd greatly appreciate any help.
Thanks
Meghna

[Manfred Leonhardt]

Hi Meghna,
As I understand it, the JCChart automatically generates the X axis values. If you want something else then you need to have the chart use PointLabels. Look at the following example at how I made the JCChart use PointLabels.

import java.awt.GridLayout;
import java.awt.Dimension;
import javax.swing.JPanel;
import javax.swing.JLabel;
import javax.swing.table.AbstractTableModel;
import javax.swing.JTable;
import com.klg.jclass.chart.JCChart;
import com.klg.jclass.chart.ChartDataView;
import com.klg.jclass.chart.data.JCChartSwingDataSource;
import com.klg.jclass.chart.JCAxis;
import com.klg.jclass.util.swing.JCExitFrame;
/**
 * Chart connected to Swing's TableModel.
 */
public class SwingChart extends JPanel 
{
  protected JCChart chart;
  /**
   * Default constructor for this class.  Loads data and
   * sets up chart.
   */
  public SwingChart() 
  {
    setLayout(new GridLayout(2,1));
    setPreferredSize(new Dimension(300, 300));
    AbstractTableModel dataModel = null;
    //
    // Create new chart instance.
    //
    chart = new JCChart();
    //
    // Load data for chart
    //
    try 
    {
      dataModel = new AbstractTableModel() 
                  {
                    public int getColumnCount()
                    { 
                      return 10; 
                    }
                    public int getRowCount() 
                    {
                      return 10;
                    }
                    public Object getValueAt(int row, int col) 
                    { 
                      return new Integer(row*col); 
                    }
                  };
      JCChartSwingDataSource src = new       JCChartSwingDataSource(dataModel);
      chart.getDataView(0).setDataSource(src);
    }
    catch (Exception e) 
    {
      e.printStackTrace(System.out);
    }
    //
    // Make header visible, and add some text
    //
    chart.getHeader().setVisible(true);
    //
    // By default, header is a JLabel - set its Text property
    //
    ((JLabel)chart.getHeader()).setText("Michelle's Microchips");
    //
    // Make footer visible
    //
    chart.getFooter().setVisible(true);
    //
    // By default, footer is a JLabel - set its Text property
    //
    ((JLabel)chart.getFooter()).setText("1963 Quarterly Results");
    //
    // Make legend visible
    //
    chart.getLegend().setVisible(true);
    //
    // Make x axis use point labels instead of default value labels.
    //
     chart.getChartArea().getXAxis(0).setAnnotationMethod(JCAxis.POINT_LABELS);
    //
    // Add chart to panel for display.
    //
    add(chart);
    //
    // Add JTable looking at the TableModel instance
    //
    JTable table = new JTable(dataModel);
    add(table);
 [B]//
    // Setup the dataview with point labels.
    //
    ChartDataView dv = chart.getDataView( 0 );
    java.util.ArrayList labels = new java.util.ArrayList();
    for( int i = 0; i < dataModel.getColumnCount(); ++i )
    {
      labels.add( ""+(i*10) );
    }
    dv.setPointLabels( labels );[/B]
  }
  public static void main(String args[]) 
  {
    JCExitFrame f = new JCExitFrame("SwingChart");
    SwingChart p = new SwingChart();
    f.getContentPane().add(p);
    f.pack();
    f.setVisible(true);
  }
}

The bolded code on the bottom of the constructor is the important stuff.
Enjoy,
Manfred.

[Meghna ks]

Thanks a lot Manfred
I really appreciate your help. I'll try out the logic with my data Model and see if I can come up with good results. Once again, I appreciate your help a lot.
Thanks
Meghna