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connect-four.html
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connect-four.html
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<canvas width='1000' height='1500'></canvas>
<script src='jquery.min.js'></script>
<script src='jcanvas.min.js'></script>
<script>
HOVER = '#6666ff';
RECT_LAYER_NAME = 'rect';
PLAYER_COLOR = 'yellow';
COMPUTER_COLOR = 'red';
BOARD_COLOR = 'blue';
SLOT_COLOR = 'white';
COMPUTER_TURN = -1;
PLAYER_TURN = 1;
EMPTY_SLOT = 0;
TURN = PLAYER_TURN;
INFINITY = 9007199250740992;
var msg = "";
function Board(){
this.COLS = 7;
this.ROWS = 6;
field = new Array(this.COLS);
for(var i = 0; i < this.COLS; i++){
field[i] = new Array(EMPTY_SLOT,EMPTY_SLOT,EMPTY_SLOT,EMPTY_SLOT,EMPTY_SLOT,EMPTY_SLOT);
}
this.field = field;
}
Board.prototype.findNextSlot = function(col){
for(var i = this.ROWS-1; i >= 0; i--){
if(this.field[col][i] == 0){
return i;
}
}
console.log('no next slot');
return null;
}
Board.prototype.drop = function(col, player){
res = this.findNextSlot(col);
if(res != null) this.field[col][res] = player;
return res;
}
function drop(col, player){
function getPlayersColor(player_){
if(player_ == PLAYER_TURN){
return PLAYER_COLOR;
}
else{
return COMPUTER_COLOR;
}
}
if(player != TURN){
console.log('not player\'s turn');
return null;
}
res = board.drop(col, player);
if(res != null){
board.drawSlot(col, res, $('canvas').getLayer('rect'+col), getPlayersColor(player));
TURN=-1*TURN;
}
if(board.checkFourConnectedOrCompleted()){
TURN=0;
alert(msg);
return;
}
if(player != COMPUTER_TURN){
ai();
}
return res;
}
Board.prototype.draw = function(){
self = this;
COL_WIDTH = 120;
HALF_COL_WIDTH = COL_WIDTH/2;
COL_HEIGHT = 1450;
function drawRect(no){
$('canvas').drawRect({
layer: true,
name: RECT_LAYER_NAME+no,
fillStyle: BOARD_COLOR,
x: no*COL_WIDTH+HALF_COL_WIDTH, y: 0,
width: COL_WIDTH, height: COL_HEIGHT,
click: function(layer) {
drop(no, 1);
},
mouseover: function(layer){
layer.fillStyle=HOVER;
},
mouseout: function(layer){
layer.fillStyle=BOARD_COLOR;
}
});
}
function drawSlots(col){
for(var i = 0; i < self.COLS; i++){
var colLayer = $('canvas').getLayer(RECT_LAYER_NAME+i);
for(var j = 0; j < self.ROWS; j++){
self.drawSlot(i, j, colLayer, SLOT_COLOR);
}
}
}
for(var i = 0; i < this.COLS; i++){
drawRect(i);
drawSlots(i);
}
}
Board.prototype.drawSlot = function(i, j, colLayer, color){
$('canvas').drawArc({
layer: true,
fillStyle: color,
x: 60+i*120, y: 60+j*120,
radius: 50,
click: function(layer) {
colLayer.click();
},
mouseover: function(layer){
colLayer.fillStyle=HOVER;
},
mouseout: function(layer){
colLayer.fillStyle=BOARD_COLOR;
}
});
}
//check left to right
function checkHorizontal(i, j){
//col 4 and higher cant have 4 connected
if(i > 3 || field[i][j] == 0){
return false;
}
var first = field[i][j];
for(var k = i+1; k < i+4; k++){
if(first != field[k][j]){
return false;
}
}
return true;
}
//check top down
function checkVertical(i, j){
if(j > 2 || field[i][j] == 0){
return false;
}
var first = field[i][j];
for(var k = j; k <= j+3; k++){
if(first != field[i][k]){
return false;
}
}
return true;
}
function checkDiagonal(i, j){
//check top down, left to right
function checkDiagonalLeftToRight(i, j){
if(i > 3 || j > 2){
return false;
}
var first = field[i][j];
for(var b = 1; b < 4; b++){
if(field[i+b][j+b] != first){
return false;
}
}
return true;
}
//check top down, left to right
function checkDiagonalRightToLeft(i, j){
if(i < 3 || j > 2){
return false;
}
var first = field[i][j];
for(var b = 1; b < 4; b++){
if(field[i-b][j+b] != first){
return false;
}
}
return true;
}
if(field[i][j] == 0) return false;
if(checkDiagonalLeftToRight(i, j)) return true;
if(checkDiagonalRightToLeft(i, j)) return true;
return false;
}
Board.prototype.checkFourConnectedOrCompleted = function(){
function checkCompleted(){
for(var i = 0; i < field.length; i++){
for(var j = 0; j < field[i].length; j++){
if(field[i][j]==0){
return false;
}
}
}
return true;
}
function checkFourConnected(){
for(var i = 0; i < field.length; i++){
for(var j = 0; j < field[i].length; j++){
if(checkHorizontal(i, j)) return true;
if(checkVertical(i, j)) return true;
if(checkDiagonal(i, j)) return true;
}
}
}
function checkCompleted(){
for(var i = 0; i < field.length; i++){
for(var j = 0; j < field[i].length; j++){
if(field[i][j] == 0){
return false;
}
}
}
return true;
}
if(checkFourConnected()){
msg = '4 connected';
return true;
}
if(checkCompleted()){
msg = 'draw';
return true;
}
return false;
}
board = new Board();
board.draw();
function ai(){
DEPTH = 4;
function undo(col, last){
board.field[col][last] = EMPTY_SLOT;
}
function negamax(depth, player){
var best = -INFINITY;
var next_turn;
if(board.checkFourConnectedOrCompleted() || depth == 0){
var result = evaluate(board.field);
return new Array(result, 0);
}
for(var i = 0; i < board.COLS; i++){
var res = board.drop(i, player);
if(res != null){
value = negamax(depth-1, player*-1);
undo(i, res);
if(-value[0] > best){
best = -value[0];
next_turn = i;
}
}
}
return [best, next_turn];
}
var res = negamax(DEPTH, COMPUTER_TURN);
drop(res[1], COMPUTER_TURN);
console.log('droped in '+res[1]+' with '+res[0]);
}
function evaluate(field){
var rating = 0;
function rateLeftToRight(i,j,player){
var rate = 0;
if(i > 3) return 0;
for(var ki = 0; ki < 4; ki++){
if(field[i+ki][j] == player){
rate += 1;
}
else if(field[i+ki][j] == EMPTY_SLOT){
}
else{
rate = 0;
break;
}
}
var k = checkHorizontal(i,j);
if(k && field[i][j]==player*-1){
rate = -INFINITY;
}
else if(k && field[i][j]==player){
rate = -INFINITY;
}
//console.log(''+i+j+':'+rate);
return rate;
}
function rateTopDown(i, j, player){
var rate = 0;
if(j > 2) return 0;
for(var ki = 0; ki < 4; ki++){
if(field[i][j+ki] == player){
rate += 1;
}
else if(field[i][j+ki] == EMPTY_SLOT){
}
else{
rate = 0;
break;
}
}
var k = checkVertical(i,j);
if(k && field[i][j]==player*-1){
rate = -INFINITY;
}
else if(k && field[i][j]==player){
rate = -INFINITY;
}
return rate;
}
function rateDiagonal(i,j,player){
var rate = 0;
rate += rateDiagonalRightToLeft(i,j,player);
rate += rateDiagonalLeftToRight(i,j,player);
var k = checkDiagonal(i,j);
if(k) debugger;
if(k && field[i][j]==player*-1){
rate = -INFINITY;
}
else if(k && field[i][j]==player){
rate = -INFINITY;
}
return rate;
}
function rateDiagonalRightToLeft(i,j,player){
var rate = 0;
if(i < 3 || j > 2) return 0;
for(var k = 0; k < 4; k++){
if(field[i-k][j+k] == player){
rate += 1;
}
else if(field[i-k][j+k] == player*-1){
rate -= 1;
}
else{
rate = 0;
break;
}
}
return rate;
}
function rateDiagonalLeftToRight(i,j,player){
var rate = 0;
if(i > 3 || j > 2) return 0;
for(var k = 0; k < 4; k++){
if(field[i+k][j+k] == player){
rate += 1;
}
else if(field[i+k][j+k] == player*-1){
rate += -1;
}
else{
rate = 0;
break;
}
}
return rate;
}
for(var ai = 0; ai < field.length; ai++){
for(var aj = 0; aj < field[ai].length; aj++){
rating += rateLeftToRight(ai, aj, COMPUTER_TURN);
rating += rateTopDown(ai, aj, COMPUTER_TURN);
rating += rateDiagonal(ai, aj, COMPUTER_TURN);
//rating -= rateLeftToRight(ai, aj, PLAYER_TURN);
//rating -= rateTopDown(ai, aj, PLAYER_TURN);
//rating -= rateDiagonal(ai, aj, PLAYER_TURN);
}
}
return rating;
}
</script>