Incorrect information?

[santa]

Is this example wrong? Drawing Graphics - Using paint() on Frame

I was trying to paint on a JFrame and I remembered that you cant paint on a JFrame but you can paint on its contentPane like JPanel ?
I think that you can paint on a Frame however?

Just got confused by this example =) Thanks...

[Fubarable]

You can draw directly on a JFrame but you really shouldn't. Much better is to draw in a JComponent such as a JPanel and add that to the JFrame, or make it its contentPane.

[santa]

Can you show me an example? =) That one does not work for me ... Thanks =)

[Fubarable]

Can you show me an example? =) That one does not work for me ... Thanks =)

I'm sorry, an example specifically of what? Of drawing in a JPanel that is loaded in a JFrame's contentPane?

[santa]

I'm sorry, an example specifically of what? Of drawing in a JPanel that is loaded in a JFrame's contentPane?

Well I searched on it now in the forum JFrame help and you should correct this post if what you're saying is true.

Just a paint example on the JFrame ... can't seem to get mine to work =P must be doing something wrong ... Thanks again =)

[Fubarable]

What I'm saying is true -- you can draw directly in a JFrame, but you shouldn't do it. For instance,

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

public class FrameDraw extends JFrame {
   public FrameDraw(String title) {
      super(title);
   }
   
   @Override
   public Dimension getPreferredSize() {
      return new Dimension(400, 400);
   }
   
   @Override
   public void paint(Graphics g) {
      super.paint(g);
      g.setColor(Color.blue);
      g.drawRect(50, 50, 300, 300);
   }

   private static void createAndShowGui() {
      JFrame frame = new FrameDraw("FrameDraw");
      frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
      frame.pack();
      frame.setLocationByPlatform(true);
      frame.setVisible(true);
   }

   public static void main(String[] args) {
      SwingUtilities.invokeLater(new Runnable() {
         public void run() {
            createAndShowGui();
         }
      });
   }
}

But much better is to draw in a JPanel and add it to the JFrame's contentPane:

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

public class PanelDraw extends JPanel {

   @Override
   public Dimension getPreferredSize() {
      return new Dimension(400, 400);
   }
   
   @Override
   protected void paintComponent(Graphics g) {
      super.paintComponent(g);
      g.setColor(Color.blue);
      g.drawRect(50, 50, 300, 300);
   }
   
   private static void createAndShowGui() {
      PanelDraw mainPanel = new PanelDraw();

      JFrame frame = new JFrame("PanelDraw");
      frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
      frame.getContentPane().add(mainPanel);
      frame.pack();
      frame.setLocationByPlatform(true);
      frame.setVisible(true);
   }

   public static void main(String[] args) {
      SwingUtilities.invokeLater(new Runnable() {
         public void run() {
            createAndShowGui();
         }
      });
   }

}

[santa]

It appears you are correct ... =) I know that you should not do it ... I was trying to impress my girlfriend and it failed =P

What did i mess up?

public class Frame extends JFrame{
public Frame(){
    setTitle("Sofie");
    setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    setSize(800, 600);
    setResizable(true);
    setLocationRelativeTo(null);
    setVisible(true);
  

}
    @Override
public void paint(Graphics g){
super.paint(g);
    g.drawString("Hej", 20, 20);
}
     public static void main(String[] args) {
      Frame f = new Frame();

    }
}

Thanks

[Fubarable]

You code is fine except for where you are drawing your text. Note that when you draw directly on the JFrame that includes the region of the title bar (and this isn't the case for drawing to a JPanel). Also, I believe that the x and y values used by drawString are the lower left corner of the text String. So change those x and y values so that the text is visible and your lady love should be very impressed with you.

[santa]

You code is fine except for where you are drawing your text. Note that when you draw directly on the JFrame that includes the region of the title bar (and this isn't the case for drawing to a JPanel). Also, I believe that the x and y values used by drawString are the lower left corner of the text String. So change those x and y values so that the text is visible and your lady love should be very impressed with you.

haha It's to late man ... she thinks i'm a loser now and probably files a divorce as we speak. If you guys need me I'll be living in a paper box by the river.

no i'm just kidding I'm 22 ;) but still that was pretty embarrassing stuff...