c4bb3c904f
Intended to simplify many of the math.random calls currently in use, and make them more semantic and thus more readable. The dice function d() takes either a two-argument form which is the same as in the C source (number of dice, faces per die) or a one-argument form that rolls a single die. The percent(N) function returns true N% of the time.
44 lines
988 B
Lua
44 lines
988 B
Lua
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-- compatibility shim
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math.random = function(...)
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local arg = {...};
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if (#arg == 1) then
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return 1 + nh.rn2(arg[1]);
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elseif (#arg == 2) then
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return nh.random(arg[1], arg[2] + 1 - arg[1]);
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else
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-- we don't support reals
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error("NetHack math.random requires at least one parameter");
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end
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end
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function shuffle(list)
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for i = #list, 2, -1 do
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local j = math.random(i)
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list[i], list[j] = list[j], list[i]
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end
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end
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align = { "law", "neutral", "chaos" };
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shuffle(align);
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-- d(2,6) = 2d6
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-- d(20) = 1d20 (single argument = implicit 1 die)
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function d(dice, faces)
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if (faces == nil) then
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-- 1-arg form: argument "dice" is actually the number of faces
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return math.random(1, dice)
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else
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local sum = 0
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for i=1,dice do
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sum = sum + math.random(1, faces)
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end
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return sum
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end
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end
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-- percent(20) returns true 20% of the time
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function percent(threshold)
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return math.random(0,99) < threshold
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end
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