Re: Game of memory

First thing's first: it's easier to theorize when you're looking at more 
concise code.  Code is not designed for computers, it's designed for 
programmers (otherwise we'd still be using punchcards). So make your 
code clean and clear, even if you're the only one reading it.

  num=array1.pop
  num=num.to_s
  @b1=ClickButton.new(self, 0, 0, num)
  num=array1.pop
  num=num.to_s
  @b2=ClickButton.new(self, 0, 80, num)

If you're numbering a set of variables it's a hint that you should be 
using a container of some sort.  In this case an array.
---------------------------------
No:
@b1 = ?
@b2 = ?

Yes:
@b = []
@b[0] = ?
@b[1] = ?

Reason why:
@b = []
array1.each_with_index do |ary_element, index|
  num = ary_element.to_s
  x = 100 * (index / 4)
  y = 80 * (index % 4)
  @b[index] = ClickButton.new(self, x, y, num)
end
---------------------------------
That should give you the ability to look at what you're doing far more 
easily.

In regards to your question, I don't know anything about Fox so I can't 
give you a direct answer.  I wouldn't give you code for an assignment 
anyway, but I can give you general advice as follows:

You want to impose a specific state on an object.  The state can be 
either on or off, so it is a 'boolean' state.  Add a property to the 
object's class:

@matched

and initialize it to false.  When the user creates a condition where the 
state of that object should be changed, set @matched to true.  In the 
methods that determine how the object interacts (how to draw it, what to 
do when it is clicked, etc) check the value of @matched and react 
accordingly.

As a side-note, I don't see what part of your code handles what to do 
when the user clicks on a button, so I don't really know where that 
check would go.

Finally, when posting code that is more than 10 lines or so please save 
the code into a text file or rb file and attach it to your post rather 
than posting the code in the message body.  :)

Hope that helps.

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