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Thread: Animation in JApplet

  1. #1
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    Default Animation in JApplet

    Hi everyone,

    I'm trying to create a very simple animation applet, but it doesn't seem to be working very well. For some reason, the background color isn't changing and the graphics aren't being drawn to the applet. I think the Thread is also causing some issues. Any help would be greatly appreciated.

    import java.awt.*;
    import javax.swing.*;
     
    public class Animation extends JApplet {
     
    	int x = 10;
    	int y = 10;
    	Drawing d;
     
     
    	public void init(){
    		setSize(500, 500);
    		d = new Drawing();
    		Container content = getContentPane();
     
    		content.add(d, BorderLayout.CENTER);
    		content.setVisible(true);
    	}
     
    	public void start(){
    		go(); 
    	}
     
    	public void go(){
     
    		for (int i = 0; i < 330; i++){
    			x++;
    			y++;
    			d.repaint();
     
    			try{
    				Thread.sleep(20);
    			} catch (Exception ex){}
    		}
     
    	}
    	public class Drawing extends JPanel {
    	    public void paintComponent(Graphics g) {
    	         super.paint(g); 
    	         Graphics2D g2 = (Graphics2D) g;
    	         this.setBackground(Color.BLACK);
    	         g.setColor(Color.ORANGE);
    	         g.fillOval(x, y, 30, 30);
    	    }
    	}
     
    }


  2. #2
    Administrator copeg's Avatar
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    Default Re: Animation in JApplet

    If you wish to do animation, I would recommend using a Swing timer (or if you know what you are doing, use a separate Thread altogether)
    How to Use Swing Timers (The Java™ Tutorials > Creating a GUI With JFC/Swing > Using Other Swing Features)
    Swing is single threaded - meaning all things swing (painting, events, etc...) are performed sequentially. In other words, you can stop tasks such as repainting and user interaction by performing long running tasks in this thread

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    Default Re: Animation in JApplet

    I think you can try this to make happen with the loops, recursive function and also with the multithreading concept. If you are familiar with this. That will be better option i think.

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    Default Re: Animation in JApplet

    Quote Originally Posted by RaoPatek View Post
    I think you can try this to make happen with the loops, recursive function and also with the multithreading concept. If you are familiar with this. That will be better option i think.
    Hugh? What the heck does a recursive function have to do with animation?

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