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+-- life.lua
+-- original by Dave Bollinger <DBollinger@compuserve.com> posted to lua-l
+-- modified to use ANSI terminal escape sequences
+-- modified to use for instead of while
+
+local write=io.write
+
+ALIVE="¥" DEAD="þ"
+ALIVE="O" DEAD="-"
+
+function delay() -- NOTE: SYSTEM-DEPENDENT, adjust as necessary
+ for i=1,10000 do end
+ -- local i=os.clock()+1 while(os.clock()<i) do end
+end
+
+function ARRAY2D(w,h)
+ local t = {w=w,h=h}
+ for y=1,h do
+ t[y] = {}
+ for x=1,w do
+ t[y][x]=0
+ end
+ end
+ return t
+end
+
+_CELLS = {}
+
+-- give birth to a "shape" within the cell array
+function _CELLS:spawn(shape,left,top)
+ for y=0,shape.h-1 do
+ for x=0,shape.w-1 do
+ self[top+y][left+x] = shape[y*shape.w+x+1]
+ end
+ end
+end
+
+-- run the CA and produce the next generation
+function _CELLS:evolve(next)
+ local ym1,y,yp1,yi=self.h-1,self.h,1,self.h
+ while yi > 0 do
+ local xm1,x,xp1,xi=self.w-1,self.w,1,self.w
+ while xi > 0 do
+ local sum = self[ym1][xm1] + self[ym1][x] + self[ym1][xp1] +
+ self[y][xm1] + self[y][xp1] +
+ self[yp1][xm1] + self[yp1][x] + self[yp1][xp1]
+ next[y][x] = ((sum==2) and self[y][x]) or ((sum==3) and 1) or 0
+ xm1,x,xp1,xi = x,xp1,xp1+1,xi-1
+ end
+ ym1,y,yp1,yi = y,yp1,yp1+1,yi-1
+ end
+end
+
+-- output the array to screen
+function _CELLS:draw()
+ local out="" -- accumulate to reduce flicker
+ for y=1,self.h do
+ for x=1,self.w do
+ out=out..(((self[y][x]>0) and ALIVE) or DEAD)
+ end
+ out=out.."\n"
+ end
+ write(out)
+end
+
+-- constructor
+function CELLS(w,h)
+ local c = ARRAY2D(w,h)
+ c.spawn = _CELLS.spawn
+ c.evolve = _CELLS.evolve
+ c.draw = _CELLS.draw
+ return c
+end
+
+--
+-- shapes suitable for use with spawn() above
+--
+HEART = { 1,0,1,1,0,1,1,1,1; w=3,h=3 }
+GLIDER = { 0,0,1,1,0,1,0,1,1; w=3,h=3 }
+EXPLODE = { 0,1,0,1,1,1,1,0,1,0,1,0; w=3,h=4 }
+FISH = { 0,1,1,1,1,1,0,0,0,1,0,0,0,0,1,1,0,0,1,0; w=5,h=4 }
+BUTTERFLY = { 1,0,0,0,1,0,1,1,1,0,1,0,0,0,1,1,0,1,0,1,1,0,0,0,1; w=5,h=5 }
+
+-- the main routine
+function LIFE(w,h)
+ -- create two arrays
+ local thisgen = CELLS(w,h)
+ local nextgen = CELLS(w,h)
+
+ -- create some life
+ -- about 1000 generations of fun, then a glider steady-state
+ thisgen:spawn(GLIDER,5,4)
+ thisgen:spawn(EXPLODE,25,10)
+ thisgen:spawn(FISH,4,12)
+
+ -- run until break
+ local gen=1
+ write("\027[2J") -- ANSI clear screen
+ while 1 do
+ thisgen:evolve(nextgen)
+ thisgen,nextgen = nextgen,thisgen
+ write("\027[H") -- ANSI home cursor
+ thisgen:draw()
+ write("Life - generation ",gen,"\n")
+ gen=gen+1
+ if gen>2000 then break end
+ --delay() -- no delay
+ end
+end
+
+LIFE(40,20)