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function winner(board)
{
for (var i=0; i<3; ++i) {
if (board.children[i].state!=""
&& board.children[i].state==board.children[i+3].state
&& board.children[i].state==board.children[i+6].state)
return true
if (board.children[i*3].state!=""
&& board.children[i*3].state==board.children[i*3+1].state
&& board.children[i*3].state==board.children[i*3+2].state)
return true
}
if (board.children[0].state!=""
&& board.children[0].state==board.children[4].state!=""
&& board.children[0].state==board.children[8].state!="")
return true
if (board.children[2].state!=""
&& board.children[2].state==board.children[4].state!=""
&& board.children[2].state==board.children[6].state!="")
return true
return false
}
function restart()
{
// No moves left - start again
for (var i=0; i<9; ++i)
board.children[i].state = ""
}
function makeMove(pos,player)
{
board.children[pos].state = player
if (winner(board)) {
win(player + " wins")
return true
} else {
return false
}
}
function computerTurn()
{
var r = Math.random();
if(r < game.difficulty){
smartAI();
}else{
randAI();
}
}
function smartAI()
{
function boardCopy(a){
var ret = new Object;
ret.children = new Array(9);
for(var i = 0; i<9; i++){
ret.children[i] = new Object;
ret.children[i].state = a.children[i].state;
}
return ret;
}
for(var i=0; i<9; i++){
var simpleBoard = boardCopy(board);
if (board.children[i].state == "") {
simpleBoard.children[i].state = "O";
if(winner(simpleBoard)){
makeMove(i,"O")
return
}
}
}
for(var i=0; i<9; i++){
var simpleBoard = boardCopy(board);
if (board.children[i].state == "") {
simpleBoard.children[i].state = "X";
if(winner(simpleBoard)){
makeMove(i,"O")
return
}
}
}
function thwart(a,b,c){//If they are at a, try b or c
if (board.children[a].state == "X") {
if (board.children[b].state == "") {
makeMove(b,"O")
return true
}else if (board.children[c].state == "") {
makeMove(c,"O")
return true
}
}
return false;
}
if(thwart(4,0,2)) return;
if(thwart(0,4,3)) return;
if(thwart(2,4,1)) return;
if(thwart(6,4,7)) return;
if(thwart(8,4,5)) return;
if(thwart(1,4,2)) return;
if(thwart(3,4,0)) return;
if(thwart(5,4,8)) return;
if(thwart(7,4,6)) return;
for(var i =0; i<9; i++){//Backup
if (board.children[i].state == "") {
makeMove(i,"O")
return
}
}
restart();
}
function randAI()
{
var open = 0;
for (var i=0; i<9; ++i)
if (board.children[i].state == "") {
open += 1;
}
if(open == 0){
restart();
return;
}
var openA = new Array(open);//JS doesn't have lists I can append to (i think)
var acc = 0;
for (var i=0; i<9; ++i)
if (board.children[i].state == "") {
openA[acc] = i;
acc += 1;
}
var choice = openA[Math.floor(Math.random() * open)];
makeMove(choice, "O");
}
function win(s)
{
msg.text = s
msg.opacity = 1
endtimer.running = true
}
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