MuestraRastreo.java

   1 import javax.swing.*;
   2 import java.awt.*; 
   3 
   4 public class MuestraRastreo extends JFrame{ 
   5         public MuestraRastreo(){ 
   6                 super("Muestra de Linea de Rastreo"); 
   7                 JPanel p = new JPanel(){
   8                         public void paint(Graphics g){ 
   9                                 int y,j;
  10                                 g.setColor(Color.yellow);    
  11                                 for(y = 50; y <= 110; y=y+5){
  12                                         g.drawLine(25,y, 300, y);    
  13                                 }    
  14                                 g.setColor(Color.blue);    
  15                                 for(y = 110; y <= 170 ; y=y+5){      
  16                                         g.drawLine(25,y, 300, y);    
  17                                 }    
  18                                 g.setColor(Color.red);    
  19                                 for(y = 170; y <= 220; y=y+5){     
  20                                         g.drawLine(25,y, 300, y);    
  21                                 }               
  22                                 g.setColor( Color.white ); 
  23                         } 
  24                 }; 
  25                 getContentPane().add(p);  
  26                 setLocation(0, 0);  
  27                 setSize(1000,1000);  
  28                 setVisible(true); 
  29         }
  30         
  31         public static void main(String[] arg){ 
  32                 new MuestraRastreo(); 
  33         } 
  34         public void update(){  
  35                 repaint(); 
  36         }
  37 }