Re: Perl 'Expert' Quiz of the Week #23 - Rotation

On Fri, Sep 10, 2004 at 08:34:51AM +1000, Rick Measham wrote:
> At 1:26 pm -0700 2004-09-09, Coleman Tom wrote:
> >Here is a proposal:
> >
> >The dots are centers of rotation.
> >The square does not change on ratation.
> >
> >initial blocks:
> >
> >    ##   .@  %.   *.*  &.&  ++.+  $.$
> >    ##  @@    %%  *      &         $
> >
> >shapes rotated once clockwise ( dots do not move ):
> >
> >                              +
> >        @     %  **     &     +    $
> >    ##  @.   %.   .     .     .   $.
> >    ##   @   %    *    &&     +    $
> >
> 
> To extend that .. here's my rotations:
> 
>     #.   .@  %.   *.*  &.&  ++.+  $.$
>     ##  @@    %%  *      &         $
> 
> 
>                               +
>         @     %  **     &     +    $
>     #.  @.   %.   .     .     .   $.
>     ##   @   %    *    &&     +    $
> 
> 
> 
> 
>     #.   .@  %.     *  &    ++.+  $.$
>     ##  @@    %%  *.*  &&&         $

should be:
                         &           $
                         &.&        $.$

The & piece simply lost its center of balance (the dot),
but the $ piece turned the wrong way.

> 
>                               +
>         @     %   *     &&    +    $
>     #.  @.   %.   .     .     .    .$
>     ##   @   %    **    &     +    $
> 
> 
> These are based on the first game of tetris I ever played. Note that 
> the '+' piece doesn't really rotate around the designated point, it 
> really toggles between horizontal and vertical.
> 
> >Rotation sometimes does not make the block extend lower than it was. 
> 
> Will never make it extend lower. There is always one segment below the 
> pivot.
> 
> 
> >Rotation is possible if all future blocks are open.
> 
> Correct. You do not have to work out the maths to make sure it could 
> physically rotate. Consider this possible move:
> 
>           6| &  +     |          6| &        |          6| &        |
>           5| &&&+&***+|          5| &&&+&***+|          5| &&& &***+|
>           4|$$$&+&*@@+|          4|$$$&+&*@@+|          4|$$$& &*@@+|
>           3|&$  + @@ +|          3|&$  + @@ +|          3|&$++++@@ +|
>           2|&&&% %%%%+|          2|&&&%+%%%%+|          2|&&&% %%%%+|
>           1+----------+          1+----------+          1+----------+
>             ABCDEFGHIJ             ABCDEFGHIJ             ABCDEFGHIJ
> 
> Not possible in the physical world but allowable in Tetris.
> 
> >Rotation cannot be combined with a drop.
> 
> One move at a time at all times. A drop is a move. A rotation is a 
> move. A left or right nudge is a move.
> 
> Thanks tom!
> 
> Cheers!
> Rick
> 
> -- 
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