Cellular Automata

Table of contents

1. Conway's Game of Life
2. Replicator world

Conway's Game of Life

use graphics: canvas, sleep

function neighbourhood(indices)
   |a,y,x,w,h| indices.count(|[i,j]| a[(y+i)%h][(x+j)%w]==1)
end

function game(argm={})
   {w=40, h=40, csize=8, speed=1, color=[0.6,0.6,0.4],
    f0 = |count| 1 if count==3 else 0,
    f1 = |count| 1 if count in 2..3 else 0,
    count = neighbourhood([-1,0,1]*[-1,1]+[[-1,0],[1,0]]),
    a = list(h).map(|y| rand(0..1).list(w))
   } = argm
   psize = csize-2
   b = list(h).map(|y| [0]*w)
   c = canvas(csize*w,csize*h)
   while true
      for i in 0..h-1
         for j in 0..w-1
            c.rgb(*(color if a[i][j]==1 else [0,0,0]))
            c.fill(csize*j,csize*i,psize,psize)
            n = count(a,i,j,w,h)
            b[i][j] = (f0 if a[i][j]==0 else f1)(n)
         end
      end
      c.flush()
      sleep(0.1/speed)
      if c.key()=="q"
         break
      end
      a,b = b,a
   end
end

game()

Replicator world

function insert(a,x,y,data)
   line=0; col=0
   for c in data
      if c=='x'
         a[y+line][x+col]=1
      end
      if c=='\n'
         line+=1; col=0
      else
         col+=1
      end
   end
end

a = list(80).map(|y| [0]*80)

insert(a,30,36,"
x .x.xxx.x...x....xx
x..x.x...x...x...x..x
xxxx.xxx.x...x...x..x
x..x.x...x...x...x..x
x..x.xxx.xxx.xxx..xx
")

game({
   w=80, h=80, csize=6,
   f0 = |count| 1 if count%2==1 else 0,
   f1 = |count| 1 if count%2==1 else 0,
   a=a, speed=0.1
})