From: Albert Ng <twinwing@...>
Date: 2007-03-12T09:37:41+09:00
Subject: Re: directly modify a part on an array for quiz #117 purposes

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that's neat, I'll keep it in mind   :)

On 3/11/07, Christoffer Lern=F6 <lerno@dragonascendant.com> wrote:
>
> On Mar 11, 2007, at 20:24 , Albert Ng wrote:
>
> > From Ruby quiz #117 (much fun)
> >
> > #bad code by me, interesting bits shamelessly stolen from Dave Burt
> > neighborhood=3D[@grid[x0][y0], @grid[x0][y1], @grid[x1][y0], @grid[x1]
> > [y1]]
> >
> > where each element of @grid[][] is a string, x1 =3D x0+1, and y1=3Dy0+1
> >
> > is there a way to do the following:
> > @grid[x0][y0], @grid[x0][y1], @grid[x1][y0], @grid[x1][y1] =3D @grid
> > [x1][y0],
> > @grid[x0][y0], @grid[x1][y1], @grid[x0][y1]
> >
> > in a more readable way
> >
> > I thought
> >
> > *neighborhood =3D @grid[x1][y0], @grid[x0][y0], @grid[x1][y1], @grid
> > [x0][y1]
> >
> > would be equivalent, but it isn't.
>
> Did you have a look at my code?
>
> I used this:
>
> 2.times do |y|
>    2.times do |x|
>      class_eval "def xy#{x}#{y}; @grid[@x + #{x}, @y + #{y}]; end"
>      class_eval "def xy#{x}#{y}=3D(v); @grid[@x + #{x}, @y + #{y}] =3D v;
> end"
>    end
> end
>
> To allow me to write the rotations as
>
>      def ccw90
>        self.xy00, self.xy10, self.xy01, self.xy11 =3D xy10, xy11, xy00,
> xy01
>      end
>
>      def cw90
>        self.xy00, self.xy10, self.xy01, self.xy11 =3D xy01, xy00, xy11,
> xy10
>      end
>
>
> Might be an idea?
>
>
> /Christoffer
>
>

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