• Post Reply Bookmark Topic Watch Topic
  • New Topic
programming forums Java Mobile Certification Databases Caching Books Engineering Micro Controllers OS Languages Paradigms IDEs Build Tools Frameworks Application Servers Open Source This Site Careers Other all forums
this forum made possible by our volunteer staff, including ...
Marshals:
  • Campbell Ritchie
  • Ron McLeod
  • Paul Clapham
  • Bear Bibeault
  • Junilu Lacar
Sheriffs:
  • Jeanne Boyarsky
  • Tim Cooke
  • Henry Wong
Saloon Keepers:
  • Tim Moores
  • Stephan van Hulst
  • Tim Holloway
  • salvin francis
  • Frits Walraven
Bartenders:
  • Scott Selikoff
  • Piet Souris
  • Carey Brown

need help with my code

 
Greenhorn
Posts: 1
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
Hi.. I'm trying to do a Frame with this draw that changes it's color each time I click the button... but it's not working ... can someone help me?

Here is the code.. ( only the button shows up in the screen).

public class MyDrawPanel extends JPanel {

public void paintComponet(Graphics g) {

g.fillRect(0, 0, this.getWidth(), this.getHeight());

int red = (int)(Math.random()*255);
int green = (int)(Math.random()*255);
int blue = (int)(Math.random()*255);
Color randomColor = new Color(red,blue,green);
g.setColor(randomColor);
g.fillOval(70,70,100,100);

}

}
_______________________________
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

/**
*
* @author babi rocha
*/
public class SimpleGui3C extends JFrame implements ActionListener {

JFrame frame;

public static void main (String[] args) {
SimpleGui3C gui = new SimpleGui3C();
gui.go();
}

public void go() {
frame = new JFrame();

frame.setLayout(new GridLayout(2, 2));

JButton button = new JButton("Change colors!");
button.addActionListener(this);

MyDrawPanel drawPanel = new MyDrawPanel();

frame.getContentPane().add(BorderLayout.SOUTH, button);
frame.getContentPane().add(BorderLayout.CENTER, drawPanel);
frame.setSize(300, 300);
frame.setVisible(true);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLocation(200,200);
frame.pack();

}

public void actionPerformed(ActionEvent e) {
frame.repaint();
}
}
 
Rancher
Posts: 43016
76
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
Welcome to JavaRanch.

paintComponet



That's your problem - the method name is missing an "n". You may want to get in the habit of using the @Override annotation to avoid this kind of mistake.
 
Bartender
Posts: 4121
IntelliJ IDE Spring Java
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator


You just misspelled paintComponent

Also, the packed frame isn't large enough for the circle to show up without resizing the frame. You may want to set the frame size specifically to a larger size and leave off the pack() call, or set the minimum and preferred size of the MyDrawPanel to a value that will take the size and location of the circle into account.
 
permaculture is largely about replacing oil with people. And one tiny ad:
the value of filler advertising in 2020
https://coderanch.com/t/730886/filler-advertising
    Bookmark Topic Watch Topic
  • New Topic