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1 -- life.lua
2 -- original by Dave Bollinger <DBollinger@compuserve.com> posted to lua-l
3 -- modified to use ANSI terminal escape sequences
4 -- modified to use for instead of while
5
6 local write=io.write
7
8 ALIVE="¥" DEAD="þ"
9 ALIVE="O" DEAD="-"
10
11 function delay() -- NOTE: SYSTEM-DEPENDENT, adjust as necessary
12 for i=1,10000 do end
13 -- local i=os.clock()+1 while(os.clock()<i) do end
14 end
15
16 function ARRAY2D(w,h)
17 local t = {w=w,h=h}
18 for y=1,h do
19 t[y] = {}
20 for x=1,w do
21 t[y][x]=0
22 end
23 end
24 return t
25 end
26
27 _CELLS = {}
28
29 -- give birth to a "shape" within the cell array
30 function _CELLS:spawn(shape,left,top)
31 for y=0,shape.h-1 do
32 for x=0,shape.w-1 do
33 self[top+y][left+x] = shape[y*shape.w+x+1]
34 end
35 end
36 end
37
38 -- run the CA and produce the next generation
39 function _CELLS:evolve(next)
40 local ym1,y,yp1,yi=self.h-1,self.h,1,self.h
41 while yi > 0 do
42 local xm1,x,xp1,xi=self.w-1,self.w,1,self.w
43 while xi > 0 do
44 local sum = self[ym1][xm1] + self[ym1][x] + self[ym1][xp1] +
45 self[y][xm1] + self[y][xp1] +
46 self[yp1][xm1] + self[yp1][x] + self[yp1][xp1]
47 next[y][x] = ((sum==2) and self[y][x]) or ((sum==3) and 1) or 0
48 xm1,x,xp1,xi = x,xp1,xp1+1,xi-1
49 end
50 ym1,y,yp1,yi = y,yp1,yp1+1,yi-1
51 end
52 end
53
54 -- output the array to screen
55 function _CELLS:draw()
56 local out="" -- accumulate to reduce flicker
57 for y=1,self.h do
58 for x=1,self.w do
59 out=out..(((self[y][x]>0) and ALIVE) or DEAD)
60 end
61 out=out.."\n"
62 end
63 write(out)
64 end
65
66 -- constructor
67 function CELLS(w,h)
68 local c = ARRAY2D(w,h)
69 c.spawn = _CELLS.spawn
70 c.evolve = _CELLS.evolve
71 c.draw = _CELLS.draw
72 return c
73 end
74
75 --
76 -- shapes suitable for use with spawn() above
77 --
78 HEART = { 1,0,1,1,0,1,1,1,1; w=3,h=3 }
79 GLIDER = { 0,0,1,1,0,1,0,1,1; w=3,h=3 }
80 EXPLODE = { 0,1,0,1,1,1,1,0,1,0,1,0; w=3,h=4 }
81 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 }
82 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 }
83
84 -- the main routine
85 function LIFE(w,h)
86 -- create two arrays
87 local thisgen = CELLS(w,h)
88 local nextgen = CELLS(w,h)
89
90 -- create some life
91 -- about 1000 generations of fun, then a glider steady-state
92 thisgen:spawn(GLIDER,5,4)
93 thisgen:spawn(EXPLODE,25,10)
94 thisgen:spawn(FISH,4,12)
95
96 -- run until break
97 local gen=1
98 write("\027[2J") -- ANSI clear screen
99 while 1 do
100 thisgen:evolve(nextgen)
101 thisgen,nextgen = nextgen,thisgen
102 write("\027[H") -- ANSI home cursor
103 thisgen:draw()
104 write("Life - generation ",gen,"\n")
105 gen=gen+1
106 if gen>2000 then break end
107 --delay() -- no delay
108 end
109 end
110
111 LIFE(40,20)