RenderWindow window(VideoMode(320, 480), "The Game!");

Texture t1,t2,t3;
t1.loadFromFile("images/tiles.png");
t2.loadFromFile("images/background.png");
t3.loadFromFile("images/frame.png");

Sprite s(t1), background(t2), frame(t3);

int dx=0; bool rotate=0; int colorNum=1;
float timer=0,delay=0.3;

Clock clock;

while (window.isOpen())
{
    float time = clock.getElapsedTime().asSeconds();
    clock.restart();
    timer+=time;

    Event e;
    while (window.pollEvent(e))
    {
        if (e.type == Event::Closed)
            window.close();

        if (e.type == Event::KeyPressed)
          if (e.key.code==Keyboard::Up) rotate=true;
          else if (e.key.code==Keyboard::Left) dx=-1;
          else if (e.key.code==Keyboard::Right) dx=1;
    }

if (Keyboard::isKeyPressed(Keyboard::Down)) delay=0.05;

//// <- Move -> ///
for (int i=0;i<4;i++)  { b[i]=a[i]; a[i].x+=dx; }
if (!check()) for (int i=0;i<4;i++) a[i]=b[i];

//////Rotate//////
if (rotate)
  {
    Point p = a[1]; //center of rotation
    for (int i=0;i<4;i++)
      {
        int x = a[i].y-p.y;
        int y = a[i].x-p.x;
        a[i].x = p.x - x;
        a[i].y = p.y + y;
      }
    if (!check()) for (int i=0;i<4;i++) a[i]=b[i];
  }

///////Tick//////
if (timer>delay)
  {
    for (int i=0;i<4;i++) { b[i]=a[i]; a[i].y+=1; }

    if (!check())
    {
     for (int i=0;i<4;i++) field[b[i].y][b[i].x]=colorNum;

     colorNum=1+rand()%7;
     int n=rand()%7;
     for (int i=0;i<4;i++)
       {
        a[i].x = figures[n][i] % 2;
        a[i].y = figures[n][i] / 2;
       }
    }

    timer=0;
  }

///////check lines//////////
int k=M-1;
for (int i=M-1;i>0;i--)
{
    int count=0;
    for (int j=0;j<N;j++)
    {
        if (field[i][j]) count++;
        field[k][j]=field[i][j];
    }
    if (count<N) k--;
}

dx=0; rotate=0; delay=0.3;

/////////draw//////////
window.clear(Color::White);
window.draw(background);

for (int i=0;i<M;i++)
 for (int j=0;j<N;j++)
   {
     if (field[i][j]==0) continue;
     s.setTextureRect(IntRect(field[i][j]*18,0,18,18));
     s.setPosition(j*18,i*18);
     s.move(28,31); //offset
     window.draw(s);
   }

for (int i=0;i<4;i++)
  {
    s.setTextureRect(IntRect(colorNum*18,0,18,18));
    s.setPosition(a[i].x*18,a[i].y*18);
    s.move(28,31); //offset
    window.draw(s);
  }

window.draw(frame);
window.display();
}

return 0;