?
Solved

a moving object in a layeredPane

Posted on 2004-09-28
3
Medium Priority
?
284 Views
Last Modified: 2011-10-03
Hi experts,

   I tried to put a moving object in a layeredPane which is in a Frame. It works fine if i add it to the code directly, but it doesn't work if i put it in a layeredPane first. Does anyone know what I did wrong ???

   please help ! many thanks.
--------------------------------
//  MovingFigs.java

import java.lang.* ;
import javax.swing.*;
import javax.swing.event.* ;
import java.awt.* ;
import java.awt.event.* ;
import java.awt.image.BufferedImage;


public class MovingFigs extends JFrame implements ActionListener{
    private JLayeredPane layeredPane;
    private JPanel myPanel ;

    /** Creates a new instance of Main */
    public MovingFigs() {
        layeredPane = new JLayeredPane();
        layeredPane.setPreferredSize(new Dimension(300, 310));
   
         MovingCircle myCircle = new MovingCircle() ;
         setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
     
          layeredPane.add( myCircle, new Integer(0)) ;
            getContentPane().setLayout(null) ;
            getContentPane().add(layeredPane) ;
          setSize(800, 600);
          show();

    }
   
   
    //-----------
    public void actionPerformed(ActionEvent e){}
    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        // TODO code application logic here
         MovingFigs meow = new MovingFigs() ;
      //   meow.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
         meow.setVisible(true);
    }    
}

//---------------------------
// MovingCircle.java

import java.lang.* ;
import javax.swing.*;
import javax.swing.event.* ;
import java.awt.* ;
import java.awt.event.* ;
import java.awt.image.BufferedImage;

public class MovingCircle extends JPanel implements ActionListener{
    private int x = 30, y = 30 ;
    private final int DELTA_X = 10 ;
    /** Creates a new instance of Class */
    public MovingCircle() {
        javax.swing.Timer circleTimer = new Timer(250, this);
        circleTimer.start();}
    public void actionPerformed(ActionEvent e){ repaint() ;}
 //--------------------
    public void paintComponent(Graphics g) {
          Graphics2D g2d = (Graphics2D) g.create();
          g2d.clearRect(0, 0, getWidth(), getHeight());
          g2d.setPaint(Color.red);
          x += DELTA_X;
          g2d.fillOval(x, y, y, y);
          g2d.drawOval(x, y, y, y);
          g2d.dispose();  
     } // paintComponent
} // MovingCircle

0
Comment
Question by:meow00
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 2
3 Comments
 
LVL 92

Expert Comment

by:objects
ID: 12175085
you aren't using any layout managers so you need to set the size and position of all components expicitly.
0
 
LVL 1

Author Comment

by:meow00
ID: 12176369
  Hi objects & experts,

     Now I set the size and position for all components, but it still doesn't work ..... did i miss anything ???  please help ! many many thanks !!!

          layeredPane.add( myCircle, new Integer(0)) ;
          layeredPane.setSize(20,20) ;
          layeredPane.setLocation(30,30) ;
           
            getContentPane().setSize(100,100) ;
            getContentPane().setLocation(50,50) ;
            getContentPane().add(layeredPane) ;
           
0
 
LVL 92

Accepted Solution

by:
objects earned 1800 total points
ID: 12176407
have you set the size and position of myCircle?
0

Featured Post

On Demand Webinar: Networking for the Cloud Era

Did you know SD-WANs can improve network connectivity? Check out this webinar to learn how an SD-WAN simplified, one-click tool can help you migrate and manage data in the cloud.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

By the end of 1980s, object oriented programming using languages like C++, Simula69 and ObjectPascal gained momentum. It looked like programmers finally found the perfect language. C++ successfully combined the object oriented principles of Simula w…
Basic understanding on "OO- Object Orientation" is needed for designing a logical solution to solve a problem. Basic OOAD is a prerequisite for a coder to ensure that they follow the basic design of OO. This would help developers to understand the b…
The viewer will learn how to implement Singleton Design Pattern in Java.
This video teaches viewers about errors in exception handling.
Suggested Courses
Course of the Month9 days, 14 hours left to enroll

762 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question