2007/4/26, Christophe Bouchard <Christophe.Bouchard at etu.univ-savoie.fr>:
> Hello,
> I have to realize an application in squeak which is an icon generator. My questions are the following:
> I have an algorithm which describe a spiral and i'd like to transcript it into squeak, but it doesn't work.
> The original algorithm is:
> " for( i=0; i < len; i++ ) {
>   theta = 2*pi*float(i) / ppr;
>   r = 0.15 * sqrt(theta);
>   x = r * cos(theta);
>   y = r * sin(theta);
>   }
> "
>
> And what i've done but that doesn't work:
> "
> spiral: len with: ppr
>
>         | theta r x y |
>
>         0 to: (len-1) do:
>                 [:i | theta = 2* Float pi * i / ppr.
>                         r = 0.15 * (self sqrt: theta).
>                         x = r * ( self cos: theta).
>                         y = r * ( self sin: theta).
>                 ]
> "

What are (self sqrt:), (self cos:) and (self sin:)? Don't you mean:

spiral: len with: ppr
       | theta r x y |

       0 to: (len-1) do:
               [:i | theta = 2* Float pi * i / ppr.
                       r = 0.15 * theta sqrt.
                       x = r * theta cos.
                       y = r * theta sin.
               ]

It still won't print anything to the screen however.

-- 
Damien Cassou