01: import java.awt.*;
02: import javax.swing.*;
03: 
04: /**
05:    This panel draws an array and marks two elements in the
06:    array.
07: */ 
08: public class ArrayPanel extends JPanel
09: {
10:    public void paintComponent(Graphics g)
11:    {
12:       if (values == null) return;
13:       super.paintComponent(g);
14:       Graphics2D g2 = (Graphics2D) g;
15:       int width = getWidth() / values.length;
16:       for (int i = 0; i < values.length; i++)
17:       {
18:          Integer v = (Integer) values[i];
19:          Rectangle bar = new Rectangle(
20:             width * i, 0, width, v.intValue());
21:          if (v == marked1 || v == marked2)
22:             g2.fill(bar);
23:          else
24:             g2.draw(bar);
25:       } 
26:    }
27: 
28:    /**
29:       Sets the values to be painted.
30:       @param values the array of values to display
31:       @param marked1 the first marked element
32:       @param marked2 the second marked element
33:    */
34:    public void setValues(Object[] values,
35:       Object marked1, Object marked2)
36:    {
37:       this.values = (Object[])values.clone();
38:       this.marked1 = marked1;
39:       this.marked2 = marked2;
40:       repaint();
41:    }
42: 
43:    private Object[] values;
44:    private Object marked1;
45:    private Object marked2;
46: }