1  import java.awt.*;

  2  import java.awt.geom.*;

  3  import javax.swing.*;

  4  

  5  /**

  6     This component draws an array and marks two elements in the

  7     array.

  8  */

  9  public class ArrayComponent extends JComponent

 10  {

 11     public void paintComponent(Graphics g)

 12     {

 13        if (values == null) return;

 14        Graphics2D g2 = (Graphics2D) g;

 15        int width = getWidth() / values.length;

 16        for (int i = 0; i < values.length; i++)

 17        {

 18           Double v =  values[i];

 19           Rectangle2D bar = new Rectangle2D.Double(

 20              width * i, 0, width, v);

 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(Double[] values,

 35        Double marked1, Double marked2)

 36     {

 37        this.values = (Double[]) values.clone();

 38        this.marked1 = marked1;

 39        this.marked2 = marked2;

 40        repaint();

 41     }

 42  

 43     private Double[] values;

 44     private Double marked1;

 45     private Double marked2;

 46  }