import com.imsl.chart.*;
import java.awt.Color;

public class SamplePick extends JFrameChart implements PickListener {
    static private final double x[] = {0, 1, 2, 3};
    static private final double y[] = {4, 1, 2, 5};
    
    public SamplePick() {
        // Create a bar chart
        Chart chart = getChart();
        AxisXY axis = new AxisXY(chart);
        Bar bar = new Bar(axis, x, y);
        bar.setBarType(Bar.BAR_TYPE_VERTICAL);
        bar.setLabels(new String[]{"A","B","C"});
        bar.setFillColor(Color.blue);
        
        // Add the pick listener to the bar
        bar.addPickListener(this);
        
        // Add the mouse listener
        addMouseListener(new java.awt.event.MouseAdapter() {
            public void mouseClicked(java.awt.event.MouseEvent event) {
                getChart().pick(event);
            }
        });
    }
    
    public void pickPerformed(PickEvent event) {
        // Track the number of hits on this bar
        ChartNode node = event.getNode();
        int count = node.getIntegerAttribute("pick.count", 0);
        count++;
        node.setAttribute("pick.count", new Integer(count));
        
        // Change the bar's color depending on the number of times
        // it has been picked.
        Color color = ((count%2==0) ? Color.blue : Color.red);
        node.setFillColor(color);
        node.setLineColor(color);
        repaint();
    }
    
    public static void main(String argv[]) {
        new SamplePick().setVisible(true);
    }
}