Re: Applet, not change color!

From:

Knute Johnson <nospam@rabbitbrush.frazmtn.com>

Newsgroups:

comp.lang.java.help

Date:

Sun, 17 Dec 2006 10:54:29 -0800

Message-ID:

<Fnghh.197876$4Z1.171474@newsfe09.phx>

michael_jd wrote:

This code works fine, but it does not seem to change the color when
requested. Thanks in advance
for any help

import java.awt.*;

public class Pattern

// change the line above to
public class Pattern extends Canvas

{
    private int width,x,y;
    private Color hColor, vColor;

    public Pattern(int x, int y, int width, Color hColour, Color
vColour)
    {
        this.width = width;
        this.x = x;
        this.y = y;
        this.hColor = hColor;
        this.vColor = vColor;
    }

    public void draw(Graphics g)

// change the line above to
public void paint(Graphics g)

    {
        int origionalX = x, origionalY = y;

        int xGap = width/10;
        int yGap = width/10;

        for(int i = 0; i < 10; i++)
        {
            g.setColor(hColor);
            g.drawLine(x,y,x + width,y);
            y += yGap;
        }

        x = origionalX;
        y = origionalY;

        for(int i = 0; i < 10; i++)
        {
            g.setColor(vColor);
            g.drawLine(x,y,x,y + width);
            x += xGap;
        }

        x = origionalX;
        y = origionalY;

        g.drawRect(x,y,width,width);
    }
}

import java.applet.Applet;

public class Quilt extends Applet
{

// change the init method to
public void init() {
     Pattern pat = new Pattern(10,10,50,Color.BLUE,Color.GREEN);
     pat.setSize(400,300);
     add(pat);
}

    public void init()
    {
        ;
    }

// lose the paint method completely in Quilt, you don't need it

    public void paint(Graphics g)
    {
        Pattern p = new Pattern(10,10,50,Color.green,Color.blue);
        p.draw(g);
    }

}

As Andrew said, consider using an application instead of an applet to
learn your programming. They are much easier to test, no browser or
appletviewer, and you can readily adapt a component to be displayed in
an applet. Consider the application version of your program below that
I wrote. You could easily add the parameters to the constructor and
then use the test class in an applet.

import java.awt.*;
import java.awt.event.*;

public class test extends Canvas {
     int width = 400;
     int height = 300;

     public test() {
         setSize(width,height);
     }

     public void paint(Graphics g) {
         g.setColor(Color.BLUE);
         for (int i=0; i<width; i+=10)
             g.drawLine(i,0,i,height);

         g.setColor(Color.RED);
         for (int i=0; i<height; i+=10)
             g.drawLine(0,i,width,i);
     }

     public static void main(String[] args) {
         Frame f = new Frame();
         f.addWindowListener(new WindowAdapter() {
             public void windowClosing(WindowEvent we) {
                 System.exit(0);
             }
         });
         test t = new test();
         f.add(t,BorderLayout.CENTER);
         f.pack();
         f.setVisible(true);
     }
}

--

Knute Johnson
email s/nospam/knute/