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AiPlayer.cpp
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AiPlayer.cpp
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#include "AiPlayer.h"
#include <iostream>
AiPlayer::~AiPlayer() {
}
AiPlayer::AiPlayer(std::string seed) {
this->seed = seed;
}
int AiPlayer::negamax(Game &game, int depth, int alpha, int beta) {
if (depth == 0) return this->evaluate(game);
std::vector<GameMove> moves = game.getPossibleMoves();
int size = moves.size();
if (size == 0) return 0;
for (int i = 0; i < size; i++) {
if (game.makeMove(moves[i])) {
if (game.hasWon(moves[i])) {
game.unmakeMove(moves[i]);
return 10;
} else {
game.switchPlayer();
int ret = - this->negamax(game, depth - 1, -beta, -alpha);
game.switchPlayer();
game.unmakeMove(moves[i]);
if(ret >= beta ) return beta;
if(ret > alpha ) alpha = ret;
}
}
}
return alpha;
}
int AiPlayer::evaluate(Game &game) {
return 0;
}
GameMove AiPlayer::askMove(const Game& game) {
Game aigame = game;
std::vector<GameMove> moves = aigame.getPossibleMoves();
int size = moves.size();
int bestMove = 0;
int alpha = -10000;
int beta = 10000;
for (int i = 0; i < size; i++) {
if (aigame.makeMove(moves[i])) {
if (aigame.hasWon(moves[i])) {
return moves[i];
} else {
aigame.switchPlayer();
int ret = - this->negamax(aigame, 5, -beta, -alpha);
if (ret >= beta) return moves[i];
if (ret > alpha) {
alpha = ret;
bestMove = i;
}
aigame.unmakeMove(moves[i]);
aigame.switchPlayer();
}
}
}
return moves[bestMove];
}