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Groups > comp.lang.java.gui > #1834

Graphics drawing problem

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  To: comp.lang.java.gui
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 ...

import java.awt.*;
import javax.swing.*;
public class StartGui {
    public static void main(String[] args) throws Exception{
		Gui gui = new Gui();
		gui.initiate();
        //Thread.sleep(2000);
        gui.test(100,100,300,300);
    }
}

import javax.swing.*;
import java.awt.*;
public class Gui extends JFrame{

	Color cN = Color.LIGHT_GRAY;
	Color cW = Color.LIGHT_GRAY;
	Color cC = Color.LIGHT_GRAY;
	Color cE = Color.LIGHT_GRAY;
	Color cS = Color.LIGHT_GRAY;
	Color cGap = Color.BLACK;

	int widthW = 200;
	int widthC = 400;
	int widthE = 200;
	int heightN = 150;
	int heightC = 400;
	int heightS = 150;

	Graphics graphics;
	JPanel n;
	JPanel s;
	JPanel e;
	JPanel w;
	JPanel c;

	public Gui() {
		new JFrame("Gui");
		n = new JPanel();
		w = new JPanel();
		e = new JPanel();
		s = new JPanel();
		c = new JPanel();
		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		pack();
		setVisible(true);
	}
	public void initiate() {
		getContentPane().setLayout(new BorderLayout(2,2));
		getContentPane().setBackground(cGap);
		n.setBackground(cN);
		n.setPreferredSize(new Dimension(widthE+widthC+widthW,heightN));
		w.setBackground(cW);
		w.setPreferredSize(new Dimension(widthW,heightC));
		c.setBackground(cC);
		c.setPreferredSize(new Dimension(widthC,heightC));
		e.setBackground(cE);
		e.setPreferredSize(new Dimension(widthE,heightC));
		s.setBackground(cS);
		s.setPreferredSize(new Dimension(widthE+widthC+widthW,heightS));
		getContentPane().add(e,BorderLayout.EAST);
		getContentPane().add(w,BorderLayout.WEST);
		getContentPane().add(n,BorderLayout.NORTH);
		getContentPane().add(s,BorderLayout.SOUTH);
		getContentPane().add(c,BorderLayout.CENTER);
		pack();
	}
	public void test(int x1, int y1, int x2, int y2){
		c.setBackground(Color.BLACK);
		graphics = c.getGraphics();
		graphics.setColor(Color.GREEN);
		graphics.drawLine(x1,y1,x2,x2);
	}
}

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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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