[ab] Anthony's rotation function

[Luke J Crook]

Justin Heyes-Jones wrote:
> Hi Luke
> 
> I grabbed the latest and did a clean up and ran it.
> 
> I get errors with most of the examples I've tried, mostly this one...
> 
> Undefined function LISPBUILDER-SDL:WRITE-PIXEL called with arguments (0
>                                                                       0
> 
> #<LISPBUILDER-SDL:COLOR 2068461C>).
>    [Condition of type UNDEFINED-FUNCTION]
> 
> 
> bmp_sample returns
> 

Can you try once more? I cleaned up a few and then did a run through of
all the examples and they seem to work for me.

Thanks,
- Luke