function GameManager(size, InputManager, Actuator, StorageManager) {
this.size = size; // Size of the grid
this.inputManager = new InputManager;
this.storageManager = new StorageManager;
this.actuator = new Actuator;
this.startTiles = 2;
this.inputManager.on("move", this.move.bind(this));
this.inputManager.on("restart", this.restart.bind(this));
this.inputManager.on("keepPlaying", this.keepPlaying.bind(this));
this.setup();
}
// Restart the game
GameManager.prototype.restart = function () {
this.storageManager.clearGameState();
this.actuator.continue(); // Clear the game won/lost message
this.setup();
};
// Keep playing after winning (allows going over 2048)
GameManager.prototype.keepPlaying = function () {
this.keepPlaying = true;
this.actuator.continue(); // Clear the game won/lost message
};
// Return true if the game is lost, or has won and the user hasn't kept playing
GameManager.prototype.isGameTerminated = function () {
if (this.over || (this.won && !this.keepPlaying)) {
return true;
} else {
return false;
}
};
// Set up the game
GameManager.prototype.setup = function () {
var previousState = this.storageManager.getGameState();
// Reload the game from a previous game if present
if (previousState) {
this.grid = new Grid(previousState.grid.size,
previousState.grid.cells); // Reload grid
this.score = previousState.score;
this.over = previousState.over;
this.won = previousState.won;
this.keepPlaying = previousState.keepPlaying;
} else {
this.grid = new Grid(this.size);
this.score = 0;
this.over = false;
this.won = false;
this.keepPlaying = false;
// Add the initial tiles
this.addStartTiles();
}
// Update the actuator
this.actuate();
};
// Set up the initial tiles to start the game with
GameManager.prototype.addStartTiles = function () {
for (var i = 0; i < this.startTiles; i++) {
this.addRandomTile();
}
};
// Adds a tile in a random position
GameManager.prototype.addRandomTile = function () {
if (this.grid.cellsAvailable()) {
var value = Math.random() < 0.9 ? 2 : 4;
var tile = new Tile(this.grid.randomAvailableCell(), value);
this.grid.insertTile(tile);
}
};
// Sends the updated grid to the actuator
GameManager.prototype.actuate = function () {
if (this.storageManager.getBestScore() < this.score) {
this.storageManager.setBestScore(this.score);
}
// Clear the state when the game is over (game over only, not win)
if (this.over) {
this.storageManager.clearGameState();
} else {
this.storageManager.setGameState(this.serialize());
}
this.actuator.actuate(this.grid, {
score: this.score,
over: this.over,
won: this.won,
bestScore: this.storageManager.getBestScore(),
terminated: this.isGameTerminated()
});
};
// Represent the current game as an object
GameManager.prototype.serialize = function () {
return {
grid: this.grid.serialize(),
score: this.score,
over: this.over,
won: this.won,
keepPlaying: this.keepPlaying
};
};
// Save all tile positions and remove merger info
GameManager.prototype.prepareTiles = function () {
this.grid.eachCell(function (x, y, tile) {
if (tile) {
tile.mergedFrom = null;
tile.savePosition();
}
});
};
// Move a tile and its representation
GameManager.prototype.moveTile = function (tile, cell) {
this.grid.cells[tile.x][tile.y] = null;
this.grid.cells[cell.x][cell.y] = tile;
tile.updatePosition(cell);
};
// Move tiles on the grid in the specified direction
GameManager.prototype.move = function (direction) {
// 0: up, 1: right, 2: down, 3: left
var self = this;
if (this.isGameTerminated()) return; // Don't do anything if the game's over
var cell, tile;
var vector = this.getVector(direction);
var traversals = this.buildTraversals(vector);
var moved = false;
// Save the current tile positions and remove merger information
this.prepareTiles();
// Traverse the grid in the right direction and move tiles
traversals.x.forEach(function (x) {
traversals.y.forEach(function (y) {
cell = { x: x, y: y };
tile = self.grid.cellContent(cell);
if (tile) {
var positions = self.findFarthestPosition(cell, vector);
var next = self.grid.cellContent(positions.next);
// Only one merger per row traversal?
if (next && next.value === tile.value && !next.mergedFrom) {
var merged = new Tile(positions.next, tile.value * 2);
merged.mergedFrom = [tile, next];
self.grid.insertTile(merged);
self.grid.removeTile(tile);
// Converge the two tiles' positions
tile.updatePosition(positions.next);
// Update the score
self.score += merged.value;
// The mighty 2048 tile
if (merged.value === 2048) self.won = true;
} else {
self.moveTile(tile, positions.farthest);
}
if (!self.positionsEqual(cell, tile)) {
moved = true; // The tile moved from its original cell!
}
}
});
});
if (moved) {
this.addRandomTile();
if (!this.movesAvailable()) {
this.over = true; // Game over!
}
this.actuate();
}
/******************************************/
/******************************************/
/* THE AI CODE STARTS FROM HERE */
/******************************************/
/******************************************/
/* 0:Up
1:Right
2:Down
3:Left
*/
this.isValid = function(x,y){
if(x < 0 || x >3 || y <0 || y > 3)
return false;
return true;
}
this.moveCells = function(matrix, move){
var dx = [-1,0,1,0];
var dy = [0,1,0,-1];
var nx,ny;
for(var k = 0;k<3;k++){
for(var i = 0;i<4;i++){
for(var j = 0; j<4; j++){
nx = i+dx[move];
ny = j+dy[move];
if(self.isValid(nx,ny)){
if(matrix[nx][ny] == 0){
matrix[nx][ny] = matrix[i][j];
matrix[i][j] = 0;
}
}
}
}
}
for(var i = 0;i<4;i++){
for(var j = 0; j<4; j++){
nx = i + dx[move];
ny = j + dy[move];
if(self.isValid(nx,ny)){
if(matrix[i][j] == matrix[nx][ny]){
matrix[nx][ny] *= -2;
matrix[i][j] = 0;
}
}
}
}
for(var k = 0;k<3;k++){
for(var i = 0;i<4;i++){
for(var j = 0; j<4; j++){
if(matrix[i][j] <0)
matrix[i][j] *= -1;
nx = i+dx[move];
ny = j+dy[move];
if(self.isValid(nx,ny)){
if(matrix[nx][ny] == 0){
matrix[nx][ny] = matrix[i][j];
matrix[i][j] = 0;
}
}
}
}
}
return matrix;
}
this.evaluateMatrix = function(matrix){
/* Count Number of Free Spaces */
var cc = 0;
for(var i = 0;i<4;i++)
for(var j = 0;j<4;j++){
if(matrix[i][j] == 0)
cc += 100;
else
cc += matrix[i][j]*matrix[i][j];
}
return cc;
}
this.printMatrix = function(matrix){
for(var i = 0;i<4;i++){
var str = ""
for(var j = 0;j<4;j++)
str += matrix[i][j] + " ";
console.log(str)
}
console.log("******************************");
}
this.findFreeCell = function(matrix){
var i,j,k=0;
do{
i = (Math.floor(Math.random()*100))%4;
j = (Math.floor(Math.random()*100))%4;
k++;
}while(matrix[i][j] != 0 && k != 500);
if(matrix[i][j] != 0)
for(i = 0;i<4;i++)
for(j = 0;j<4;j++)
if(matrix[i][j] == 0)
return ({x:i, y:j});
return ({x:i, y:j});
}
this.isEqualMatrix = function(m1,m2){
for(var i = 0;i<4;i++)
for(var j = 0;j<4;j++)
if(m1[i][j] != m2[i][j])
return false;
return true;
}
this.minMax = function(matrix, move, depth){
if(depth == 6)
return 0;
var rmatrix = self.moveCells(self.createCopy(matrix),move);
var areSame = self.isEqualMatrix(rmatrix, matrix);
var score = self.evaluateMatrix(rmatrix);
if(areSame == true)
return score-1;
var maxVal=-1000,val,ret;
var freeCell = self.findFreeCell(rmatrix);
if(freeCell.x == 4 || freeCell.y == 4)
console.log("YES VALUE IS 4 || " + freeCell.x + " | " + freeCell.y);
rmatrix[freeCell.x][freeCell.y] = 2;
for(var x = 0;x<4;x++)
{
val = this.minMax(self.createCopy(rmatrix), x, depth+1);
if(val > maxVal)
maxVal = val;
}
return (score+maxVal);
}
this.getMove = function(matrix){
var maxVal = 0,val,ret;
for(var x = 0; x < 4;x++){
val = this.minMax(self.createCopy(matrix),x,0);
// console.log("Score for "+ x + ":" + val )
if(val > maxVal){
maxVal = val;
ret = x;
}
}
return ret;
}
this.getMatrix = function(){
var matrix = [];
for (var i = 0 ; i <4 ; i++) {
var row = [];
for (var j = 0; j < 4; j++) {
tile = self.grid.cellContent({x:j, y:i});
if(tile == null)
row.push(0);
else
row.push(tile["value"]);
};
matrix.push(row);
};
return matrix;
}
this.createCopy = function(matrix){
var ret =[[0,0,0,0],[0,0,0,0],[0,0,0,0],[0,0,0,0]];
for(var i = 0; i < 4;i++)
for(var j = 0; j < 4; j++)
ret[i][j] = matrix[i][j].valueOf();
return ret;
}
setTimeout(function() {
matrix = self.getMatrix();
var myMove = self.getMove(self.createCopy(matrix));
var rmat = self.moveCells(self.createCopy(matrix), myMove);
console.log(myMove);
if( self.isEqualMatrix(rmat,matrix))
myMove = (Math.floor(Math.random()*100))%4;
self.move(myMove);
}, 100);
/******************************************/
/******************************************/
/* THE AI CODE ENDS HERE */
/******************************************/
/******************************************/
};
// Get the vector representing the chosen direction
GameManager.prototype.getVector = function (direction) {
// Vectors representing tile movement
var map = {
0: { x: 0, y: -1 }, // Up
1: { x: 1, y: 0 }, // Right
2: { x: 0, y: 1 }, // Down
3: { x: -1, y: 0 } // Left
};
return map[direction];
};
// Build a list of positions to traverse in the right order
GameManager.prototype.buildTraversals = function (vector) {
var traversals = { x: [], y: [] };
for (var pos = 0; pos < this.size; pos++) {
traversals.x.push(pos);
traversals.y.push(pos);
}
// Always traverse from the farthest cell in the chosen direction
if (vector.x === 1) traversals.x = traversals.x.reverse();
if (vector.y === 1) traversals.y = traversals.y.reverse();
return traversals;
};
GameManager.prototype.findFarthestPosition = function (cell, vector) {
var previous;
// Progress towards the vector direction until an obstacle is found
do {
previous = cell;
cell = { x: previous.x + vector.x, y: previous.y + vector.y };
} while (this.grid.withinBounds(cell) &&
this.grid.cellAvailable(cell));
return {
farthest: previous,
next: cell // Used to check if a merge is required
};
};
GameManager.prototype.movesAvailable = function () {
return this.grid.cellsAvailable() || this.tileMatchesAvailable();
};
// Check for available matches between tiles (more expensive check)
GameManager.prototype.tileMatchesAvailable = function () {
var self = this;
var tile;
for (var x = 0; x < this.size; x++) {
for (var y = 0; y < this.size; y++) {
tile = this.grid.cellContent({ x: x, y: y });
if (tile) {
for (var direction = 0; direction < 4; direction++) {
var vector = self.getVector(direction);
var cell = { x: x + vector.x, y: y + vector.y };
var other = self.grid.cellContent(cell);
if (other && other.value === tile.value) {
return true; // These two tiles can be merged
}
}
}
}
}
return false;
};
GameManager.prototype.positionsEqual = function (first, second) {
return first.x === second.x && first.y === second.y;
};
