Re: Problem with Timer object

tkthuc@gmail.com wrote:


Your code was still not compilable and I don't have the time to play
with it. I still think you should try a different approach rather than
all the timers. Animation can be tricky to get working well. I wrote
you an example of how I think you should approach your problem. Adding
pauses for door opening/closing should be just a matter of adding some
new states to the Direction enum and some more logic code to the run()
method and paint the doors.

Note: I used the European convention for the floors. The first floor
above the ground floor is 1.

import java.awt.*;
import java.awt.event.*;
import java.util.*;
import javax.swing.*;

public class test99 extends JPanel implements ActionListener, Runnable {
     // start with car on fifth floor
     volatile int Y = 150;
     volatile int floor = 150;
     enum Direction { UP, DOWN, STOP };
     Direction dir = Direction.STOP;

     public test99() {
         setPreferredSize(new Dimension(200,200));
     }

     public void start() {
         new Thread(this).start();
     }

     public void actionPerformed(ActionEvent ae) {
         String ac = ae.getActionCommand();
         if (ac.equals("4")) {
             if (dir == Direction.STOP)
                 floor = 120;
                 if (Y < floor)
                     dir = Direction.UP;
                 else
                     dir = Direction.DOWN;
         } else if (ac.equals("G")) {
             if (dir == Direction.STOP) {
                 floor = 0;
                 if (Y > floor)
                     dir = Direction.DOWN;
             }
         }
     }

     public void run() {
         while (true) {
             // 25 frames per second delay
             try {
                 Thread.sleep(40);
             } catch (InterruptedException ie) { }

             switch (dir) {
                 case UP: Y += 1; break;
                 case DOWN: Y -= 1; break;
                 case STOP: break;
             }
             // stop car if on correct floor
             if (Y == floor)
                 dir = Direction.STOP;
             repaint();
         }
     }

     public void paintComponent(Graphics g2D) {
         // need Graphics2D for the stroke
         Graphics2D g = (Graphics2D)g2D;
         // draw background
         g.setColor(getBackground());
         g.fillRect(0,0,getWidth(),getHeight());
         // draw car
         g.setColor(Color.BLUE);
         g.fillRect(13,164-Y,19,22);
         // draw shaft
         g.setColor(getForeground());
         Stroke s = g.getStroke();
         g.setStroke(new BasicStroke(4.0f));
         for (int i=0; i<6; i++)
             g.drawRect(10,10+i*30,25,30);
     }

     public static void main(String[] args) {
         EventQueue.invokeLater(new Runnable() {
             public void run() {
                 test99 t99 = new test99();
                 JFrame f = new JFrame();
                 f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                 f.add(t99,BorderLayout.CENTER);
                 JPanel p = new JPanel();
                 JButton b = new JButton("4");
                 b.addActionListener(t99);
                 p.add(b);
                 b = new JButton("G");
                 b.addActionListener(t99);
                 p.add(b);
                 f.add(p,BorderLayout.SOUTH);
                 f.pack();
                 f.setVisible(true);
                 t99.start();
             }
         });
     }
}

--

Knute Johnson
email s/nospam/knute2008/

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