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Re: Graphics drawing prob

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  To: comp.lang.java.gui
On 14 Jun., 19:39, Knute Johnson <nos...@rabbitbrush.frazmtn.com>
wrote:
> sydpo...@gmail.com wrote:
> > Hi,
>
> > I'm a java gui newbie. I have this problem;
>
> > I made a class "Gui" I want to use as a template for future Gui
> > builds. I want to draw lines in the center. I made a "test" method
> > which I call from main class. For some reason the line I attempt to
> > draw is not visible. When I call sleep between the initiate() and the
> > test() methods the line will sometimes be visible.
>
> > I would appreciate any pointers of what I'm doing wrong. I paste the
> > source ...
>
> Drawing needs to be done in the paintComponent() method for Swing
> components.
>
> import java.awt.*;
> import java.awt.event.*;
> import javax.swing.*;
>
> public class XComponent extends JComponent {
>      public XComponent() {
>          setPreferredSize(new Dimension(40,40));
>      }
>
>      public void paintComponent(Graphics g) {
>          g.drawLine(0,0,getWidth(),getHeight());
>          g.drawLine(getWidth(),0,0,getHeight());
>      }
>
>      public static void main(String[] args) {
>          Runnable r = new Runnable() {
>              public void run() {
>                  JFrame f = new JFrame();
>                  f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
>                  XComponent x = new XComponent();
>                  f.add(x);
>                  f.pack();
>                  f.setVisible(true);
>              }
>          };
>          EventQueue.invokeLater(r);
>      }
>
> }
>
> --
>
> Knute Johnson
> email s/nospam/knute/

Ok, thx a lot Knute, with your advice I made it work.

Can someone recommend a link where I can find something about how the
graphical elements of Java works explained in a short and precise way
(both high level and low level topics). Since I'm a newbie with regard
to graphics, I also seek information about the basics, e.g. when I
read some stuff mentioning the word "render", I would like to know
what actually happens on the underlying levels when graphics are
rendered.

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Graphics drawing problem "sydpolen" <sydpolen@THRWHITE.remove-dii-this> - 2011-04-27 15:35 +0000
  Re: Graphics drawing prob "Knute Johnson" <knute.johnson@THRWHITE.remove-dii-this> - 2011-04-27 15:35 +0000
    Re: Graphics drawing prob "sydpolen" <sydpolen@THRWHITE.remove-dii-this> - 2011-04-27 15:35 +0000
      Re: Graphics drawing prob "Judy Szikora" <judy.szikora@THRWHITE.remove-dii-this> - 2011-04-27 15:35 +0000
        Re: Graphics drawing prob "Jul" <jul@THRWHITE.remove-dii-this> - 2011-04-27 15:35 +0000

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