46 lines
1.5 KiB
Text
46 lines
1.5 KiB
Text
--
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-- grid is eg for w=3,h=2: {"+---+---+---+", -- ("wall")
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-- "| ? | ? | ? |", -- ("cell")
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-- "+---+---+---+", -- ("wall")
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-- "| ? | ? | ? |", -- ("cell")
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-- "+---+---+---+", -- ("wall")
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-- ""} -- (for a trailing \n)
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--
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-- note those ?(x,y) are at [y*2][x*4-1], and we navigate
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-- using y=2..2*h (+/-2), x=3..w*4-1 (+/-4) directly.
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--
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constant w = 11, h = 8
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sequence wall = join(repeat("+",w+1),"---")&"\n",
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cell = join(repeat("|",w+1)," ? ")&"\n",
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grid = split(join(repeat(wall,h+1),cell),'\n')
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procedure amaze(integer x, integer y)
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grid[y][x] = ' ' -- mark cell visited
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sequence p = shuffle({{x-4,y},{x,y+2},{x+4,y},{x,y-2}})
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for i=1 to length(p) do
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integer {nx,ny} = p[i]
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if nx>1 and nx<w*4 and ny>1 and ny<=2*h and grid[ny][nx]='?' then
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integer mx = (x+nx)/2
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grid[(y+ny)/2][mx-1..mx+1] = ' ' -- knock down wall
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amaze(nx,ny)
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end if
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end for
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end procedure
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function heads()
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return rand(2)=1 -- 50:50 true(1)/false(0)
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end function
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integer {x,y} = {(rand(w)*4)-1,rand(h)*2}
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amaze(x,y)
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-- mark start pos
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grid[y][x] = '*'
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-- add a random door (heads=rhs/lhs, tails=top/btm)
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if heads() then
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grid[rand(h)*2][heads()*w*4-1] = ' '
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else
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x = rand(w)*4-1
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grid[heads()*h*2+1][x-1..x+1] = ' '
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end if
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puts(1,join(grid,'\n'))
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