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Code Template: Probabilistic Automaton #36

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Code Template: Probabilistic Automaton #36

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13 changes: 9 additions & 4 deletions src/iframe/life-game.js
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Original file line number Diff line number Diff line change
Expand Up @@ -16,14 +16,19 @@ const cellSize = 600 / boardSize; //セルの大きさ(px)

// around: 周囲の生きたセル数 self: 自身が生きているかどうか
function isNextAlive(around, self) {
// 自身が生きている & 周囲が 2 か 3 で生存
// 自身が生きている & 周囲が 2 か 3 で生存 50%の確率でこのルールに従う
if (self && 2 <= around && around <= 3) {
return self;
return Math.random() > 0.5 ? self : !self;
}
// 自身が死んでいる & 周囲が 3 で誕生
// 自身が生きている & 周囲が2,3以外で死亡 50%の確率でこのルールに従う
if (self && (around < 2 || around > 3)) {
return Math.random() > 0.5 ? !self : self;
}
// 自身が死んでいる & 周囲が 3 で誕生 50%の確率でこのルールに従う
if (!self && around === 3) {
return 1;
return Math.random() > 0.5 ? 1 : 0;
}
// 自身が死んでいる & 周囲が3以外で死亡のまま
return 0;
}

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