On 1 avr. 2014, at 16:50, Roelof Wobben <r.wobben@home.nl> wrote:

Nicolai Hess schreef op 1-4-2014 16:44:

2014-04-01 16:21 GMT+02:00 Roelof Wobben <r.wobben@home.nl>:

Camille Teruel schreef op 1-4-2014 15:08:

On 1 avr. 2014, at 14:52, Roelof Wobben <r.wobben@home.nl> wrote:

Hello,

Hello,

Im on this page now: http://squeak.preeminent.org/tut2007/html/017.html

I do not understand one thing.

Where do I put the initialize "script"

#initialize is not a script, it's a method. When an object is instantiated (for ex with: MyObject new) #initialize is automatically sent to it.
This is the place to put your newly created object in a correct initial state.
In your class, you just define a protocol named for example "initialization" where you put all the initialization-related methods.
Note that protocols have no meaning, i.e. they don't change how your objects behave, they're just here to help you classify
the methods of a class by concerns.
So the tutorial tell you to create two methods: #initialize that is automatically called after an object has been instantiated and #initializeActiveSegments where you
put some other initialization logic, that's all.

When I put it on the initializeActiveSegments then initialize get not found.

Sorry, I don't understand.

Or must I make a seperate protocol named ActiveSegments for it.

No use the same protocol "initialization" or "initialize-release" or whatever.

Oke,

I changed it so I have this :

Laser-Game-Model
with as classes:
  - BlankCell
  - Grid
  - MirrorCell
  -TargetCell


BlankCell has the following protocols:
- initializing-release
- testing

Initializing - release contains the following  methods:
 - initialize
 - initializeActiveSegments

testing contains the following methods:
isOn
isOff

but when I run the test-runner I see this : MessageNotUnderstood : BlankCell >> activeSegments.

Roelof

Then you missed the last step on http://squeak.preeminent.org/tut2007/html/016.html
Select "create instance var accessors" from the second popup menu.  

I also did.
See this :

Object subclass: #BlankCell
    instanceVariableNames: 'activeSegments'
    classVariableNames: ''
    category: 'Laser-Game-Model'

This message just serve as a class definition, it basically says "I want a class named BlankCell, subclass of Object, with one instance variable named activeSegments, in the category Laser-Game-Model". 

But, it says nothing about BlankCell methods.

So as Nicolai pointed out, you forgot to do the last step of page 16. It will create two methods for accessing the instance variable activeSegments:

First an accessor method:

BlankCell>>activeSegments

^ activeSegments

And a mutator (you should rename the argument to better convey the intent) 

BlankCell>>activeSegments: anObject

activeSegments := anObject

Roelof