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| 1 | +package cpu |
| 2 | + |
| 3 | +import ( |
| 4 | + "math/rand" |
| 5 | + |
| 6 | + "github.com/y-hatano-github/4inarow/game" |
| 7 | +) |
| 8 | + |
| 9 | +// ExecCPUTurn CPUのターン実行 |
| 10 | +func ExecCPUTurn(b *game.Board) { |
| 11 | + x, y, sx := 0, 0, 0 |
| 12 | + // 左右どちらから走査するか |
| 13 | + if rand.Intn(2) == 1 { |
| 14 | + sx = 6 |
| 15 | + } |
| 16 | + |
| 17 | + // 勝てる場所を探す |
| 18 | + for x = 0; x < 7; x++ { |
| 19 | + if b.Height[x] > 9 { |
| 20 | + continue |
| 21 | + } |
| 22 | + y = 9 - b.Height[x] |
| 23 | + if checkCPUCell(x, y, 4, game.CPU, b) { |
| 24 | + b.Put(x, game.CPU) |
| 25 | + return |
| 26 | + } |
| 27 | + } |
| 28 | + |
| 29 | + // 負ける場所を探す |
| 30 | + for x = 0; x < 7; x++ { |
| 31 | + if b.Height[x] > 9 { |
| 32 | + continue |
| 33 | + } |
| 34 | + y = 9 - b.Height[x] |
| 35 | + if checkCPUCell(x, y, 4, game.Player, b) { |
| 36 | + b.Put(x, game.CPU) |
| 37 | + return |
| 38 | + } |
| 39 | + } |
| 40 | + |
| 41 | + // Playerが三つそろう箇所を抑える |
| 42 | + for x = 0; x < 7; x++ { |
| 43 | + x2 := Abs(sx - x) |
| 44 | + if b.Height[x2] > 9 { |
| 45 | + continue |
| 46 | + } |
| 47 | + y = 9 - b.Height[x2] |
| 48 | + if checkCPUCell(x2, y, 3, game.Player, b) { |
| 49 | + // 次の手で負ける場合は抑えない |
| 50 | + if IsCPULostNextTurn(x2, y, b) { |
| 51 | + continue |
| 52 | + } |
| 53 | + b.Put(x2, game.CPU) |
| 54 | + return |
| 55 | + } |
| 56 | + } |
| 57 | + |
| 58 | + // CPUが三つそろう箇所を抑える |
| 59 | + for x = 0; x < 7; x++ { |
| 60 | + x2 := Abs(sx - x) |
| 61 | + if b.Height[x2] > 9 { |
| 62 | + continue |
| 63 | + } |
| 64 | + y = 9 - b.Height[x2] |
| 65 | + if checkCPUCell(x2, y, 3, game.CPU, b) { |
| 66 | + // 次の手で負ける場合は抑えない |
| 67 | + if IsCPULostNextTurn(x2, y, b) { |
| 68 | + continue |
| 69 | + } |
| 70 | + b.Put(x2, game.CPU) |
| 71 | + return |
| 72 | + } |
| 73 | + } |
| 74 | + |
| 75 | + // Playerが二つそろう箇所を抑える |
| 76 | + for x = 0; x < 7; x++ { |
| 77 | + x2 := Abs(sx - x) |
| 78 | + if b.Height[x2] > 9 { |
| 79 | + continue |
| 80 | + } |
| 81 | + y = 9 - b.Height[x2] |
| 82 | + if checkCPUCell(x2, y, 2, game.Player, b) { |
| 83 | + // 次の手で負ける場合は抑えない |
| 84 | + if IsCPULostNextTurn(x2, y, b) { |
| 85 | + continue |
| 86 | + } |
| 87 | + b.Put(x2, game.CPU) |
| 88 | + return |
| 89 | + } |
| 90 | + } |
| 91 | + |
| 92 | + // CPUが二つそろう箇所を抑える |
| 93 | + /* |
| 94 | + for x = 0; x < 7; x++ { |
| 95 | + x2 := Abs(sx - x) |
| 96 | + if b.Height[x2] > 9 { |
| 97 | + continue |
| 98 | + } |
| 99 | + y = 9 - b.Height[x2] |
| 100 | + if checkCPUCell(x2, y, 2, game.CPU, b) { |
| 101 | + // 次の手で負ける場合は抑えない |
| 102 | + if IsCPULostNextTurn(x2, y, b) { |
| 103 | + continue |
| 104 | + } |
| 105 | + b.Put(x2, game.CPU) |
| 106 | + return |
| 107 | + } |
| 108 | + }*/ |
| 109 | + |
| 110 | + // ランダムに手を置く |
| 111 | + for x = 0; x < 7; x++ { |
| 112 | + rx := rand.Intn(7) |
| 113 | + if b.Height[rx] > 9 { |
| 114 | + continue |
| 115 | + } |
| 116 | + y = 9 - b.Height[rx] |
| 117 | + // 負ける場所にはおかない |
| 118 | + if IsCPULostNextTurn(rx, y, b) { |
| 119 | + continue |
| 120 | + } |
| 121 | + b.Put(rx, game.CPU) |
| 122 | + return |
| 123 | + } |
| 124 | + |
| 125 | + // 期待した場所がなければ空いている場所に置く |
| 126 | + for x = 0; x < 7; x++ { |
| 127 | + x2 := Abs(sx - x) |
| 128 | + if b.Height[x2] > 9 { |
| 129 | + continue |
| 130 | + } |
| 131 | + b.Put(x2, game.CPU) |
| 132 | + break |
| 133 | + } |
| 134 | +} |
| 135 | + |
| 136 | +// checkCPUCell CPUの手(期待値)のチェック |
| 137 | +func checkCPUCell(x, y, c int, z game.Char, b *game.Board) bool { |
| 138 | + cbord := b.Board |
| 139 | + cbord[y][x] = z |
| 140 | + return b.CheckCellCount(x, y, c, z, cbord) |
| 141 | +} |
| 142 | + |
| 143 | +// IsCPULostNextTurn 次の手でCPUが負けるか |
| 144 | +func IsCPULostNextTurn(x, y int, b *game.Board) bool { |
| 145 | + if b.Height[x] > 8 { |
| 146 | + return false |
| 147 | + } |
| 148 | + cbord := b.Board |
| 149 | + cbord[y][x] = game.CPU |
| 150 | + cbord[y-1][x] = game.Player |
| 151 | + |
| 152 | + return b.CheckCellCount(x, y-1, 4, game.Player, cbord) |
| 153 | +} |
| 154 | + |
| 155 | +// Abs 絶対値 mathだとfloatなので |
| 156 | +func Abs(x int) int { |
| 157 | + if x < 0 { |
| 158 | + return -x |
| 159 | + } |
| 160 | + return x |
| 161 | +} |
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