SFML_random_room_movement

#include <SFML/Graphics.hpp>
#include <iostream>

const int NUM_ROOMS = 100;
const int POS = 200;
const int SIZE = 20;
const int SPEED = 1; // original 1, causes invisible wall bug when more than 1, ex 5
const int P_SIZE = 6;
const int WINDOW_WIDTH  = 800 + 160*2;
const int WINDOW_HEIGHT = 450 +  90*2;

class Room {
    public:
        sf::RectangleShape rectangle;

        void setup()
        {
            int rand_size_x = rand()%(SIZE+1) + 2*SIZE;
            int rand_size_y = rand()%(SIZE+1) + 1*SIZE;
            int rand_pos_x  = rand()%(2*POS+1) - POS;
            int rand_pos_y  = rand()%(2*POS+1) - POS;

            rectangle.setSize(sf::Vector2f(rand_size_x, rand_size_y));
            rectangle.setFillColor(sf::Color::White);
            rectangle.setPosition(int(WINDOW_WIDTH/2)+rand_pos_x, int(WINDOW_HEIGHT/2)+rand_pos_y);
        }
};

int main()
{
    ///////////////
    ///  SETUP  ///
    ///////////////
    srand((unsigned)time(NULL));
    bool up = false, down = false, left = false, right = false;
    int last_x = 0;
    int last_y = 0;

    sf::RenderWindow Window;
    Window.create(sf::VideoMode(WINDOW_WIDTH, WINDOW_HEIGHT), "random_rooms_02", sf::Style::Close);
    Window.setVerticalSyncEnabled(true);


    // Room Setup
    std::vector<Room> rooms;
    for (int i = 0; i < NUM_ROOMS; i++)
    {
        Room my_room;
        rooms.push_back(my_room);
        rooms[i].setup();
    }

    // Player Setup
    sf::RectangleShape player;
    player.setSize(sf::Vector2f(P_SIZE, P_SIZE));
    player.setFillColor(sf::Color::Red);
    player.setPosition(300, 200);


    while (Window.isOpen())
    {
        sf::Event event;
        while(Window.pollEvent(event))
        {
            switch(event.type)
            {
            case sf::Event::Closed:
                Window.close();
                break;

            case sf::Event::TextEntered:
                if (sf::Keyboard::isKeyPressed(sf::Keyboard::Escape))
                    Window.close();
                break;
            case sf::Event::KeyPressed:
                if      (event.key.code == sf::Keyboard::W)
                    up    = true;
                else if (event.key.code == sf::Keyboard::A)
                    left  = true;
                else if (event.key.code == sf::Keyboard::S)
                    down  = true;
                else if (event.key.code == sf::Keyboard::D)
                    right = true;
                break;

            case sf::Event::KeyReleased:
                if      (event.key.code == sf::Keyboard::W)
                    up = false;
                else if (event.key.code == sf::Keyboard::A)
                    left = false;
                else if (event.key.code == sf::Keyboard::S)
                    down = false;
                else if (event.key.code == sf::Keyboard::D)
                    right = false;
                break;
            }
        }

        //////////////////
        ///  Movement  ///
        //////////////////
        last_x = player.getPosition().x;
        last_y = player.getPosition().y;

        if (right == true && left == false) // D
            player.move(SPEED, 0);
        else if (right == false && left == true) // A
            player.move(-SPEED, 0);
        if (up == true && down == false) // W
            player.move(0, -SPEED);
        else if (up == false && down == true) // S
            player.move(0, SPEED);

        for (int i = 0; i < NUM_ROOMS; i++)
        {
            if (player.getGlobalBounds().intersects(rooms[i].rectangle.getGlobalBounds()))
            {
                player.setPosition(last_x, last_y);
                break;
            }
        }

        //Clearing and drawing:
        Window.clear();
        for (int i = 0; i < NUM_ROOMS; i++)
            Window.draw(rooms[i].rectangle);
        Window.draw(player);
        Window.display();

    } // Window.isOpen loop
}