RE: [Rails-devel] Drawing chits on the stock market

[Erik V. <eri...@hc...>]

> 
> > In the current classes I have included:
> > - in StockSpace: an ArrayList of Companies having their 
> markers (or tokens)
> > there,
> > in top-to-bottom sequence,
> > - in PublicCompany: its currentPrice, which is a StockSpace 
> instance,
> > identifying
> > the location of its stock price marker (or null for 
> companies without priced
> > shares).
> > 
> > So the marker's StockSpace and the marked Company have a 
> mutual reference to
> > each other.
> > This is the way I would tend to approach issues like this.
> > And this way we do not need a new class.
> 
> 
> Ok... we should probably add accessor methods for obtaining 
> the location
> of the marker on the stock market. 

Already there.
You can do that from a PublicCompany object by calling getCurrentPrice().
And find the companies having markers on a specific StockSpace by calling
getTokens().

In StockMarketTestServlet I draw the stock market, including the markers 
(just text in this case) as follows (leaving out the HTML-writing code):

for (row = 0; row < stockMarket.getNumberOfRows(); row++) {
	for (col = 0; col < stockMarket.getNumberOfColumns(); col++) {
		square = stockMarket.getStockSpace(row, col);
		if (square != null) {
			/* Draw square */

			iterator = square.getTokens().iterator();
			while (iterator.hasNext()) {
				company = (PublicCompany) iterator.next();

				/* Draw marker */
			}
		}
	}
}

The getTokens() iterator returns the markers (or tokens, I see I have 
messed up naming seriously myself) in top-to-bottom sequence.
Would you need the sequence reversed for drawing? 

Erik.