Solved

images IN frames?

Posted on 2000-02-29
7
188 Views
Last Modified: 2010-03-30
Is it possible to load images in frames?

meaning loading images in extends Frame.

Using sdk2 (jdk 1.2.2.)

how to load? *i not expecting jframe*
0
Comment
Question by:java_kevin
  • 4
  • 3
7 Comments
 
LVL 7

Accepted Solution

by:
Ravindra76 earned 50 total points
ID: 2568881
import java.awt.*;
import java.awt.event.*;

public class Test extends Frame {
      MyCanvas can;
      MyWindowAdapter maw;
      Image img;
      public Test() {
            super("Test text components");
            img = getToolkit().getImage("a.gif");
            can = new MyCanvas();
            can.repaint();
            add(can);
            addWindowListener(maw=new MyWindowAdapter(this));
      }

      public static void main(String arg[]) {
            Test t = new Test();
            t.setSize(300, 300);       
            t.setVisible(true);
      }

      class MyCanvas extends Canvas {
            public MyCanvas(){
                  super();
                  setSize(100,100);
            }
            public void paint(Graphics g) {
                  g.drawImage(img,0,0,this);

            }
      }
       class MyWindowAdapter extends WindowAdapter {
            Frame f;
            public MyWindowAdapter(Frame f) {
                  this.f = f;
            }
            public void windowClosing(WindowEvent e) {
                  f.dispose();
                  System.exit(0);
            }
      }
}
0
 

Author Comment

by:java_kevin
ID: 2569516
But if i extends applet instead of canvas, wat's the diff(erence)?
0
 

Author Comment

by:java_kevin
ID: 2569518
But if i extends applet instead of canvas, wat's the diff(erence)?
0
Industry Leaders: We Want Your Opinion!

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

 
LVL 7

Expert Comment

by:Ravindra76
ID: 2569586


Applet has to be executed on browser..

It is not good to chagne MyCanvas to extend Canvas.

Other wise U can change Frame to Applet

But applet won't have constructors( They have. But we won't  use).

So all the code for frame constructor should be placed in init() method of applet

Best of luck
0
 

Author Comment

by:java_kevin
ID: 2571233
i mean, for the "class within  class", u extended Canvas. If i extend Applet instead, will there be any difference in the way of coding? and what's the difference between extends applet and canvas.

Right now, I'm having applet within frame. Using frame is to enable my project to work. Applet is to provide the image rendering.
0
 
LVL 7

Expert Comment

by:Ravindra76
ID: 2572226
If U ewxtend MyCanvas as applet,
When U have to construct the MyCanvs(), it has to call constructor ..
so applet has to be constructed.
According to sun documentation, don's use constructor to applet because after init() method only,
they are able to execute properly. If U put constructor to applet, the constructor has to be called before
init() which is not preferable.

MyCanvas extending Canvas does not have such problems
Otherwise U can extends as MyCanvas extends Panel, which is same as Applet extending Panel..

ANy how, putting applet in frame for painting is not a better idea.
So U can extend MyCanvas with Canvas or Panel ...

Best of luck
0
 
LVL 7

Expert Comment

by:Ravindra76
ID: 2572233
from http://www.best.com/~pvdl/f.html 

When I subclass Applet, why should I put setup code in the init() method? Why not just a constructor for
my class?

A. The browser invokes your constructor, then setStub, then init(). Hence when your constructor is
invoked, the AppletStub (and through it the AppletContext) is not yet available. Although in principle you
can do things in the constructor that don't rely (even indirectly) on the AppletStub or AppletContext, it is
less error-prone to simply defer all setup to the init method. That way you know that anything that needs
the stub/context will have it available.

0

Featured Post

Free Tool: ZipGrep

ZipGrep is a utility that can list and search zip (.war, .ear, .jar, etc) archives for text patterns, without the need to extract the archive's contents.

One of a set of tools we're offering as a way to say thank you for being a part of the community.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Java Flight Recorder and Java Mission Control together create a complete tool chain to continuously collect low level and detailed runtime information enabling after-the-fact incident analysis. Java Flight Recorder is a profiling and event collectio…
Basic understanding on "OO- Object Orientation" is needed for designing a logical solution to solve a problem. Basic OOAD is a prerequisite for a coder to ensure that they follow the basic design of OO. This would help developers to understand the b…
Viewers learn about the third conditional statement “else if” and use it in an example program. Then additional information about conditional statements is provided, covering the topic thoroughly. Viewers learn about the third conditional statement …
This tutorial explains how to use the VisualVM tool for the Java platform application. This video goes into detail on the Threads, Sampler, and Profiler tabs.

749 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question