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Re: Canvas Wanted (simple question)

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On 12/11/2011 2:02 PM, Paweł Lampe wrote:
> Hi !
>
> Recently, I have not too much time to google smth or read Thinking in
> Java. I hope so, I will get answer for my question in O(1) here.
>
> First, short story:
> I designed some UML for my new project (Traffic Simulation). I started to
> implement it, but I have reached the point that I need to draw some. In
> "main" I added new JFrame, made it visible and then I getGraphics and
> started to draw. However nothing appeard.
>
> I think my delphi-like-approach is wrong so the question is : "how should
> I do it well ?" and maybe "Where should I place main_drawing_loop?".
>
> I suspect I need more classes to make whole GUI work fine, but got no
> idea how to do it.
>
> Pls help me or paste some links.
>
> Thanks

Simplest way to do this is to add a JPanel to the JFrame and do your 
drawing on that JPanel.

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

public class test extends JPanel {
     public test() {
         // so the layout manager knows how big to make component
         setPreferredSize(new Dimension(400,300));
     }

     // do all of your drawing in the overridden method paintComponent()
     public void paintComponent(Graphics g) {
         int w = getWidth();
         int h = getHeight();
         // draw background
         g.setColor(Color.BLACK);
         g.fillRect(0,0,w,h);
         // draw 40x30 rect in middle
         g.setColor(Color.WHITE);
         g.drawRect(w/2-40,h/2-30,80,60);
     }

     public static void main(String[] args) {
         // create GUI on EDT (event dispatch thread)
         EventQueue.invokeLater(new Runnable() {
             public void run() {
                 JFrame f = new JFrame();
                 f.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
                 f.add(new test(),BorderLayout.CENTER);
                 f.pack();
                 f.setVisible(true);
             }
         });
     }
}


-- 

Knute Johnson

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Thread

Canvas Wanted (simple question) Paweł Lampe <scony@sconysoft.com> - 2011-12-11 22:02 +0000
  Re: Canvas Wanted (simple question) Knute Johnson <nospam@knutejohnson.com> - 2011-12-11 15:55 -0800
    Re: Canvas Wanted (simple question) Joerg Meier <joergmmeier@arcor.de> - 2011-12-24 01:49 +0100
      Re: Canvas Wanted (simple question) markspace <-@.> - 2011-12-23 17:26 -0800
        Re: Canvas Wanted (simple question) Joerg Meier <joergmmeier@arcor.de> - 2011-12-24 03:41 +0100
          Re: Canvas Wanted (simple question) markspace <-@.> - 2011-12-23 21:42 -0800
            Re: Canvas Wanted (simple question) Joerg Meier <joergmmeier@arcor.de> - 2011-12-24 14:16 +0100
              Re: Canvas Wanted (simple question) markspace <-@.> - 2011-12-24 06:47 -0800
      Re: Canvas Wanted (simple question) Knute Johnson <nospam@knutejohnson.com> - 2011-12-23 21:21 -0800
        Re: Canvas Wanted (simple question) markspace <-@.> - 2011-12-23 21:48 -0800
      Re: Canvas Wanted (simple question) Joerg Meier <joergmmeier@arcor.de> - 2011-12-24 14:20 +0100
        Re: Canvas Wanted (simple question) "John B. Matthews" <nospam@nospam.invalid> - 2011-12-24 11:22 -0500
  Re: Canvas Wanted (simple question) Roedy Green <see_website@mindprod.com.invalid> - 2011-12-12 09:58 -0800
  Re: Canvas Wanted (simple question) Paweł Lampe <scony@sconysoft.com> - 2011-12-14 15:57 +0000
    Re: Canvas Wanted (simple question) Daniel Pitts <newsgroup.nospam@virtualinfinity.net> - 2011-12-14 10:21 -0800

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