How to createImage(w,h) in JFrame constructor?

[Cynthia Marat]

Hello,

I need to create an ImageIcon of 20 by 20 pixels
of a plain color which could be changed from time to time.

The solution is to do the following statement:
new ImageIcon(Image image);

In order to create Image of changeable colors,
I need to use createImage(int width, int height)
and having so:

Image icon = new ImageIcon( createImage(20,20) );

later on, I can change the color as:

Graphics ig = GroupingFrame.icon.getImage().getGraphics();
ig.setColor(color);
ig.fillRect(0,0, 15,15);
setIcon(icon);

This does not work as I need the icon instance during the JFrame construction
(ListCellRenderer's getListCellRendererComponent)

getToolkit does not work either.

Thanks
Cynthia

[Laurent Lequenne]

Here is what I found :)

Hello

If you take a look inside the createImage(int, int) method of class
Component (See next snip) you will see that it use the peer
Component...In case that your peer dosen't exist --->peer=null; the
result of the method call is null after the next instruction:
return (peer != null) ? peer.createImage(width, height) : null;

More about peer components:

A peer component is created when the component is displayed for the
first time on the screen or when the component is added on the
container which is also a peer.. . A peer component is a platform
dependent GUI component created by JVM to use the same look and feel
as the user of the concerning paltform is used with....So it is a
intermediate level between JVM and the specific platform... The bad
part is that you can not have transparent peer components and the
communication between user-component is slower.. The solution si to
create lightweight components (directly extend class Component or use
Swing components-the new generation of Java GUI components)..

(As I know-If anybody else has other
knowledge about the peer creation and about peer component -please
let us know..)

......
public Image createImage(int width, int height) {
ComponentPeer peer = this.peer;
if (peer instanceof java.awt.peer.LightweightPeer) {
return parent.createImage(width, height);
} else {
return (peer != null) ? peer.createImage(width, height) : null;
}
}
...........

My best wishes
Calin
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"Cynthia Marat" <c_m...@mypad.com> wrote in message
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