why isnt my background color displaying correctly ?

[nicnicnic]

what i wanna do with my program is adding circle and rectangle into my jtextpane

that is working

but at the moment, it doesnt show the white background color for my jtextpane

whats wrong ?

Main class

import javax.swing.JFrame;
import javax.swing.JTabbedPane;
import javax.swing.JMenuBar;
import javax.swing.JMenu;
import javax.swing.JMenuItem;
import javax.swing.JScrollPane;

import java.awt.BorderLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

public class Mains extends JFrame 
{
	private JTabbedPane             jtp        	= new JTabbedPane();
	private Transpa                 tp[]        = new Transpa[5];
	   
	private int                     i = 0;

	
    public static void main( String[] argv ) 
    {
    	Mains  m = new Mains();     
    }

    
    public Mains() 
    {

    	createDocument();

           
        JMenuBar menuBar = new JMenuBar();
        setJMenuBar (menuBar);

        JMenu file = new JMenu ("File");
        JMenuItem newItemFile = new JMenuItem ("New");
        newItemFile.addActionListener (new ActionListener() 
        {
            public void actionPerformed (ActionEvent e) 
            {
            	createDocument();
            }
        });
               
        file.add(newItemFile);    
        menuBar.add(file);   
        

        setSize(990,735);
        pack();
        setVisible(true);    
   }
  
    
    
   public void createDocument()
   {   
	    tp[i] = new Transpa();  
	    

        JScrollPane editorScroll = new JScrollPane(tp[i]);
     
 		jtp.add("doc"+(i+1), editorScroll);	
 	    getContentPane().add(jtp,BorderLayout.CENTER);
 	    i++;
   }  
}

Transpa class

import javax.swing.JTextPane;

import java.awt.Color;
import java.awt.Graphics;

import java.util.Random; 


public class Transpa extends JTextPane
{
	
	public Transpa()
	{
		this.setBackground(Color.WHITE);
		this.setOpaque(false);
	}
		
		
	public void paintComponent(Graphics g)
	{
		Random r = new Random();
		Color  c = new Color(r.nextInt(256), r.nextInt(256), r.nextInt(256));
		g.setColor(c);
	    g.fillRect(0,0,50,50);
	    g.drawOval(50,50,30,40);
	    super.paintComponent(g);
	}
}

Thankz for the help

[PhHein]

How do you expect to see the background color after this:

this.setOpaque(false);

[nicnicnic]

ok but if i dont add that line

this.setOpaque(false);

it wont show the circle and rectangle

so what im doing wrong ?

im new to painting 2d

and im trying to find the solution

ty for the reply

[PhHein]

I'd try to put super.paintComponent(g); as the first line of your overridden method. Just a guess.

[nicnicnic]

import javax.swing.JTextPane;

import java.awt.Color;
import java.awt.Graphics;

import java.util.Random; 


public class Transpa extends JTextPane
{
	
	public Transpa()
	{
		this.setOpaque(false);
		this.setBackground(Color.WHITE);
	}
		
	@Override	
	public void paintComponent(Graphics g)
	{
		super.paintComponent(g);
		Random r = new Random();
		Color  c = new Color(r.nextInt(256), r.nextInt(256), r.nextInt(256));
		g.setColor(c);
	    g.fillRect(0,0,50,50);
	    g.drawOval(50,50,30,40);
	}
}

is it that how your supposed to do it ?

i try that way but it didnt help


but ty for the reply again and trying to help me out


its so a weird " bug " if you can say it that way

p.s. maybe i need to put the repaint(); function into it ? i will test it

The repaint() didnt workout well too.

[nicnicnic]

import javax.swing.JTextPane;

import java.awt.Color;
import java.awt.Graphics;

import java.util.Random;


public class Transpa extends JTextPane
{

public Transpa()
{
//this.setOpaque(false);
this.setBackground(Color.WHITE);
}

@Override
public void paintComponent(Graphics g)
{
super.paintComponent(g);
Random r = new Random();
Color c = new Color(r.nextInt(256), r.nextInt(256), r.nextInt(256));
g.setColor(c);
//g.fillRect(0,0,getWidth(),getHeight());
g.fillRect(0,0,50,50);
//g.drawOval(50,50,30,40);
super.repaint();
}
}



thats work :D

ty for the help PhHein

[PhHein]

I don't know what you expect but this looks OK to me:

public class Transpa extends JTextPane
{
	
	public Transpa()
	{
		this.setBackground(Color.WHITE);
		this.setOpaque(true);
	}
		
		
	public void paintComponent(Graphics g)
	{
	    super.paintComponent(g);
	    Random r = new Random();
	    Color  c = new Color(r.nextInt(256), r.nextInt(256), r.nextInt(256));
            g.setColor(c);
	    g.fillRect(0,0,50,50);
	    g.drawOval(50,50,30,40);
	   
	}
}

[PhHein]

thats work :D

ty for the help PhHein

Ah, so you got it :)

[nicnicnic]

ya:) thank you alot:)

im not new to java but to java2d yes so sometimes im doing noob things hehe

btw if you wanna have a laugh

copy and paste this code and try it lol i laugh hard the first time i did this

import javax.swing.JFrame;
import javax.swing.JTabbedPane;
import javax.swing.JMenuBar;
import javax.swing.JMenu;
import javax.swing.JMenuItem;
import javax.swing.JScrollPane;
import javax.swing.UIManager;

import java.awt.BorderLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.Color;
public class Mains extends JFrame 
{
	private JTabbedPane             jtp        	= new JTabbedPane();
	private Transpa                 tp[]        = new Transpa[5];
	   
	private int                     i = 0;

	
    public static void main( String[] argv ) 
    {
    	Mains  m = new Mains(); 
    }

    
    public Mains() 
    {
    	super("Editor Text Center");
    	createDocument();

           
        JMenuBar menuBar = new JMenuBar();
        setJMenuBar (menuBar);

        JMenu file = new JMenu ("File");
        JMenuItem newItemFile = new JMenuItem ("New");
        newItemFile.addActionListener (new ActionListener() 
        {
            public void actionPerformed (ActionEvent e) 
            {
            	createDocument();
            }
        });              
        file.add(newItemFile);    
        menuBar.add(file);   
        

        setSize(990,735);
        pack();
        setVisible(true);    
   }
  
    
    
   public void createDocument()
   {   
	    tp[i] = new Transpa();  
        JScrollPane editorScroll = new JScrollPane(tp[i]);
 		jtp.add("doc"+(i+1), editorScroll);	
 	    getContentPane().add(jtp,BorderLayout.CENTER);
 	    i++;
   }  
}

import javax.swing.JTextPane;

import java.awt.Color;
import java.awt.Graphics;

import java.util.Random; 


public class Transpa extends JTextPane
{
	
	public Transpa()
	{
		//this.setOpaque(false);
		this.setBackground(Color.WHITE);
	}
		
	@Override	
	public void paintComponent(Graphics g)
	{
		super.paintComponent(g);
		Random r = new Random();
		Color  c = new Color(r.nextInt(256), r.nextInt(256), r.nextInt(256));
		g.setColor(c);
	    g.fillRect(0,0,getWidth(),getHeight());
		//g.fillRect(0,0,50,50);
	    //g.drawOval(50,50,30,40);
	    super.repaint();
	}
}

LOLLLLLLLLLL have fun:)