From: Pa Per <xxx@...>
Date: 2006-10-26T18:45:48+09:00
Subject: Re: Beginner would like help with oo-modelling

Benj,

thanks for your input!

The option of rendering different outputs is supposed to be part of The 
Concept, but although you're affirming my assumption that All Roads Lead 
to Rome, my hopes for a specific hint to one of those roads are 
disappointed now :-)

Even as I'm trying to discover OO ways of modeling that may not be even 
sensible, I'm currently stuck, and I most likely would be stuck on the 
procedural path as well. Actually, I have been playing and now I've 
mostly run out of game ideas..

I would just like someone to push me into the right direction, 
specifically addressing the matter of storing the line data (whether as 
attribute or independent).

I've been thinking about using a relational approch using two [storage 
units], one containing type and positional data of a line, while the 
other just stores line-type related information as color, width, ..

As arrays apparently only support integer keys, and the order in which 
the line elements are stored does not really matter, my guess is that a 
hash using the position of each line (float) as keys, and the style of 
line as value, plus another hash or array that contains just the 
different styles might be a good approach.

Then I could iterate with the step method to insert an element, if there 
is none yet. Resulting in a 'list' with all lines.
I assume that I then could easily extract a specific type of line, fetch 
the corresponding style information from the other list, and voilà! - 
generate what I want.

Could you kindly provide me with your thoughts about this approach? If 
it is not doomed, I shall gain motivation and so will be able to try out 
procedural and OO constellations, learning the wonderous workings of 
arrays and hashes, and eventually improving the program, so everyone 
will be able to create her/his badly-needed ruler..

I have access to books describing OO with UML, but maybe I can extract 
the concept without having to 'bother' about UML yet.

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