Manipulation of existing objects

Hi all,

I am fairly new to Squeak, and so far I have figured out the syntax  
and everything, I do understand the basics. However, I am stuck on one  
particular thing - manipulation of objects that have been created, and  
are now in a World. I think the easiest example of what I mean is by  
the following. Assume for a moment I have created a simple  
RectangleMorph in the World, in this case with a specific parameter,  
the color. The code for this would work out as:

| rectangle |
rectangle := RectangleMorph new openInWorld.
rectangle color: Color white.

Now, that the object is created in the World, how do I change its  
properties while it exists? How would one change the color of the  
RectangleMorph in this example, while it is on screen? Since  
everything is an object, and objects can receive messages, I do  
believe this to be possible, correct?


Thanks for your help,

Marcus



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Hi

> | rectangle |
> rectangle := RectangleMorph new openInWorld.
> rectangle color: Color white.
>
> Now, that the object is created in the World, how do I change its  
> properties while it exists? How would one change the color of the  
> RectangleMorph in this example, while it is on screen? Since  
> everything is an object, and objects can receive messages, I do  
> believe this to be possible, correct?

Just send messages to your reference (rectangle).

You did this in line 2

rectangle color: Color white.

You can send other messages like

rectangle useRoundedCorners.

If you dont have a reference to your morph, open a workspace, select  
in its menu

"create textual references to dropped morphs"

then drag and drop your morph into your workspace. Use the printed  
reference to send messages to.

Hope this helps
Enno
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On Jan 6, 2008, at 22:05 , Enno Schwass wrote:

Actually, the usual way is to open an inspector on the object you  
want to work with, and start sending messages to self.

- Bert -


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ya, an inspector works, you can also use the halo to change some things in morphic



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And to get the inspector (if you didn't know), you can start with the
red menu halo, go to debug, and then choose inspect morph.

On Jan 6, 2008 5:16 PM, David Zmick <[hidden email]> wrote:
> ya, an inspector works, you can also use the halo to change some things in
> morphic

> On Jan 6, 2008 3:19 PM, Bert Freudenberg <[hidden email] > wrote:

> > Actually, the usual way is to open an inspector on the object you
> > want to work with, and start sending messages to self.
> >
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