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sumanta.ch |
/*
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connect6.cpp
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June 9, 2011
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This file contains the game AI
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By Kevin Nam
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*/
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//#include <time.h>
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//#include <stdlib.h>
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//
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//#include "util.h"
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//#include "connect6.h"
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#include "./shared.h"
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// Subtract this many points for moves at the edges.
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#define EDGEPENALTY 5
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/* The cost function simply counts all of the consecutive stones of same colour in
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every direction from the spot for which the points is being calculated.
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Ex:
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.DDLL
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.DLDD
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DXDDD
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...D.
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Above, X is the spot being calculated.
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The points would be 2 (above) + 2(topright) + 3(right) + 1 (left) = 8.
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It treats opponent's stones and own stones with equal weighting.
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Return 0 if the spot y,x is already taken, else return the calculated value
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*/
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void move_to_ascii(int x,int y, char *move){
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if (y >= 10){
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move[0] = '1';
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y -= 10;
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} else {
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move[0] = '0';
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}
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if (y == 0) move[1] = '0';
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else if (y == 1) move[1] = '1';
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else if (y == 2) move[1] = '2';
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else if (y == 3) move[1] = '3';
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else if (y == 4) move[1] = '4';
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else if (y == 5) move[1] = '5';
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else if (y == 6) move[1] = '6';
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else if (y == 7) move[1] = '7';
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else if (y == 8) move[1] = '8';
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else if (y == 9) move[1] = '9';
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// Do same for x.
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if (x >= 10){
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move[2] = '1';
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x -= 10;
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} else {
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move[2] = '0';
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}
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if (x == 0) move[3] = '0';
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else if (x == 1) move[3] = '1';
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else if (x == 2) move[3] = '2';
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else if (x == 3) move[3] = '3';
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else if (x == 4) move[3] = '4';
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else if (x == 5) move[3] = '5';
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else if (x == 6) move[3] = '6';
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else if (x == 7) move[3] = '7';
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else if (x == 8) move[3] = '8';
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else if (x == 9) move[3] = '9';
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}
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static int char_to_int(short x){
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if(x>=48)
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return x-48;
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else
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return 0;
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}
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/*
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The AI Function that calls the cost function for every spot on the board.
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It returns the location with the highest points. In the event of a tie, randomly decide.
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Input the board and the colour being played.
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Puts the move (in ASCII chars) inside move[4]. This is from [1 ... 19]
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Puts the move (in integers) in moveY and moveX. This is from [0 ... 18]
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*/
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int connect6ai_synth(int firstmove,char movein[8], char colour, char moveout[8]){
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#pragma bitsize firstmove 17
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short x,y,highx = 0;
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Board *myboard ;
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AIMoves *moves;
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//-------------------------------------------------------------------------
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if((firstmove >= 1)){
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//update the board
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y = char_to_int(movein[0])*10 + char_to_int(movein[1]) - 1;
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x = char_to_int(movein[2])*10 + char_to_int(movein[3]) - 1;
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if(colour==68){//'D')
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//myboard[y][x] = (char)2;//76;//'L';
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place_piece_type(myboard,x,y,PIECE_WHITE);
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myboard->turn=PIECE_BLACK;
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}else{
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//myboard[y][x] = (char)1;//68;//'D';
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place_piece_type(myboard,x,y,PIECE_BLACK);
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myboard->turn=PIECE_WHITE;
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}
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}
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if((firstmove >=3)){
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//update the board
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y = char_to_int(movein[4])*10 + char_to_int(movein[5]) - 1;
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x = char_to_int(movein[6])*10 + char_to_int(movein[7]) - 1;
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if(colour==68){//'D')
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//myboard[y][x] = (char)2;//76;//'L';
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place_piece_type(myboard,x,y,PIECE_WHITE);
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myboard->turn=PIECE_BLACK;
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}else{
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//myboard[y][x] = (char)1;//68;//'D';
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place_piece_type(myboard,x,y,PIECE_BLACK);
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myboard->turn=PIECE_WHITE;
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}
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}
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moves=ai_threats(myboard);
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// Modify the myboard based on current move.
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place_piece_type(myboard,moves->data[1].x,moves->data[1].y,myboard->turn);
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/// Convert the int coordinates to corresponding ASCII chars
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move_to_ascii(moves->data[1].x+1,moves->data[1].y+1,moveout);
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//-------------------------------------------------------------------------
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if(firstmove>=1){
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moves=ai_threats(myboard);
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// Modify the myboard based on current move.
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place_piece_type(myboard,moves->data[1].x,moves->data[1].y,myboard->turn);
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/// Convert the int coordinates to corresponding ASCII chars
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move_to_ascii(moves->data[1].x+1,moves->data[1].y+1,&moveout[4]);
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}
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return 0;
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}
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