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Java Discussion Thread
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Views: 42370

Feb 21st, 2005

How to draw a line

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HI,

All I want to do is put a straight line under my 3 labels which I have loaded into a JFrame.

After my JFrame has loaded I use the method repaint() which is supposed to call:

public void paintComponent(Graphics comp) {
Graphics2D comp2D = (Graphics2D)comp;
comp2D.drawLine(0,60,100,60);

}

Which does not draw my line. The method repaint() does not even allow me to go to the method paintComponent(Graphics comp). What am I doing wrong

Any help would be appreciated

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bsunkel

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since Nov 2004

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Feb 21st, 2005

Re: How to draw a line

This is how I do my lines but I just started java a month ago and it is the only way I have been introduced to.
public void paint(Graphics g) {
g.drawLine(25, 0, 25, 50);
g.setColor(Color.black);

OurNation

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Jun 1st, 2011

Re: How to draw a line

public void draw (Graphics g)

function is not supported for the JFrame. Indeed JFrame does not have any painting capability.

You can either use the draw function for Applets or you can use a Swing component with draw capability like JPanel.

Below code should work :

Java Syntax (Toggle Plain Text)
import javax.swing.*;
import java.awt.*;
public class cizim extends JPanel{
  //www.bilgisayarkavramlari.com
  public void paintComponent(Graphics g){
    g.drawLine(0,0,90,90);
  }
  public static void main(String args[]){
    JFrame jf = new JFrame();
    jf.add(new cizim());
 
 
    jf.setSize(500,500);
    jf.setVisible(true);
  }
}
import javax.swing.*;
import java.awt.*;
public class cizim extends JPanel{
  //www.bilgisayarkavramlari.com
  public void paintComponent(Graphics g){
    g.drawLine(0,0,90,90);
  }
  public static void main(String args[]){
    JFrame jf = new JFrame();
    jf.add(new cizim());


    jf.setSize(500,500);
    jf.setVisible(true);
  }
}

shedai

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Jun 1st, 2011

Re: How to draw a line

Don't post in tool old dead threads if you have any new thing to share then create a new thread

abelLazm

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Postaholic

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since Feb 2011

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Jun 1st, 2011

Re: How to draw a line

>> Don't post in tool old dead threads if you have any new thing to share then create a new thread

There's nothing in the rules that forbids people to post in an old thread as long as the reply is on-topic and not just another question (thread-hijacking).
The post made by "shedai" is on-topic and might help people who have the same problem and find this thread on google.

Last edited by Nick Evan; Jun 1st, 2011 at 6:55 am.

Nick Evan

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This thread is more than three months old

No one has posted to this discussion for at least three months. Please let old threads die and do not reply to them unless you feel you have something new and valuable to contribute that absolutely must be added to make the discussion complete. Otherwise, please start a new thread in this forum instead.

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