int minToLive = 2;
int maxToLive = 3;
int countForBirth = 3;

int sizeX = 20;
int sizeY = 20;
int fieldSize = 10;
boolean[][] board;
boolean paused = true;

void reInit(int w, int h, int fS){
    noLoop();
    
    sizeX = w;
    sizeY = h;
    fieldSize = fS;
    
    fill(255);
    text("X: " + sizeX + " | Y: " + sizeY + " || FieldSize: " + fieldSize, 20, 20)
    paused = true;
    setup();
    
}
void setup(){
    board = new boolean[sizeX][sizeY];
    
    frameRate(10);
    size(sizeX * fieldSize , sizeY * fieldSize);
    
    loop();
}
void draw(){
    background(255);
    
    for(int x = 0; x < sizeX; x++){
        for(int y = 0; y < sizeY; y++){
            noStroke();
            if(board[x][y])
                fill(150,0,0);
            else
                fill(100);
            rect(x*fieldSize, y* fieldSize, fieldSize, fieldSize);
            
            /*fill(255);
            text("" + countNeighbours(x, y) + "" ,x*fieldSize, y*fieldSize + fieldSize);*/
        }
    }
    update();
}

void mouseDragged(){
    if(mousePressed){
        int x = (int)(mouseX / fieldSize);
        int y = (int)(mouseY / fieldSize);
        
        board[x][y] = true;
    }
}

void update(){
    if(!paused){
        boolean[][] _tmp = new boolean[sizeX][sizeY];
        //arrayCopy(board,_tmp); // _tmp = board.clone();

        for(int x = 0; x < sizeX; x++){
            for(int y = 0; y < sizeY; y++){
                int c = countNeighbours(x,y);
                if(c < minToLive || c > maxToLive)
                    _tmp[x][y] = false;
                else if(c == countForBirth || (c >= minToLive && c <= maxToLive && board[x][y]))
                    _tmp[x][y] = true;
            }
        }

        arrayCopy(_tmp, board); //board = _tmp.clone();
        //paused = true;
    }
}

// 1 2 3
// 4   5
// 6 7 8
int countNeighbours(int x, int y){
    int counter = 0;
    
    int _x = 0;
    int _y = 0;
    
    //N1
        if(x == 0)
            _x = sizeX -1;
        else
            _x = x -1;
            
        if(y == 0)
            _y = sizeY -1;
        else
            _y = y -1;
        
        if(board[_x][_y])
            counter++;

    //N2
        _x = x;
        if(y == 0)
            _y = sizeY -1;
        else
            _y = y - 1;
        if(board[_x][_y])
            counter++;
    //N3
        if(x == sizeX -1)
            _x = 0;
        else
            _x = x + 1;
        if(y == 0)
            _y = sizeY -1;
        else
            _y = y -1;
        if(board[_x][_y])
            counter++;
    //N4
        _y = y;
        if(x == 0)
            _x = sizeX -1;
        else
            _x = x -1;
        if(board[_x][_y])
            counter++;
    //N5
        _y = y;
        if(x == sizeX -1)
            _x = 0;
        else
            _x = x +1;
        if(board[_x][_y])
            counter++;
    //N6
        if(x == 0)
            _x = sizeX -1;
        else
            _x = x -1;
        if(y == sizeY -1)
            _y = 0;
        else
            _y = y +1;
        if(board[_x][_y])
            counter++;
    //N7
        _x = x;
        if(y == sizeY -1)
            _y = 0;
        else
            _y = y +1;
        if(board[_x][_y])
            counter++;
    //N8
        if(x == sizeX -1)
            _x = 0;
        else
            _x = x +1;
        if(y == sizeY -1)
            _y = 0;
        else
            _y = y +1;
        if(board[_x][_y])
            counter++;
    return counter;
}
void pause(){
    paused = !paused;
}
void keyPressed() {
    if(keyCode == ENTER)
        paused = !paused;
    if(keyCode == DOWN)
        reInit(20,20,10);
}