problem with sf::VertexArray

[iTh3End]

hey, im beginner in sfml and here i want  draw one vertex between two points but when i call window.draw(lines); I get an error: Use undeclared identifier "lines"
what should i do?
thanks

   sf::RenderWindow window(sf::VideoMode(600, 400), "Convex Hull");

   
   
    std::vector<sf::RectangleShape> rects;
   
    while (window.isOpen())
    {
        sf::Event event;
        while (window.pollEvent(event) )
        {
       
       
       
       
            if (event.type == sf::Event::Closed)
                window.close();
            else if (event.type == sf::Event::MouseButtonPressed &&
                     event.mouseButton.button == sf::Mouse::Left&&
                     rects.size() < 10) {
               
                posx.push_back(event.mouseButton.x);
                posy.push_back(event.mouseButton.y);
               
//                cout << posx[f] << "   " << posy[f] << endl;
                f++;
               
//                cout << f << endl;
                sf::RectangleShape rect { { 2, 2 } };
                rect.setPosition(sf::Vector2f(sf::Mouse::getPosition(window)));
                rect.setFillColor(sf::Color::Green);
                rects.push_back(rect);
               
                cout << &rects << endl;
               
                sf::VertexArray lines(sf::LinesStrip, 2);
                lines[0].position = sf::Vector2f(posx[0], posy[0]);
                lines[1].position = sf::Vector2f(posx[10], posy[10]);
               
               

               
            }
           
            if (f == 10)
                break;
        }
   
       
        window.clear();
        for (const auto &r : rects)
            window.draw(r);
       
             window.draw(lines); // Error is here
       
        window.display();
    }
       

[Gambit]

Your "lines" variable and the draw call are in different scopes which cannot access each other. Try moving your lines variable outside of your main loop and clear it at the end of each frame.

[iTh3End]

outside of         while (window.pollEvent(event) ) ?

[Gambit]

Yes. Either that or your while (window.isOpen()) loop. If you do it your way you do not have to clear it each frame.

[iTh3End]

i do that, compiled but my window is not open,

[Raincode]

If by "my window is not open" you mean it doesn't appear though your application is running - have you put the necessary dlls in the working directory of your program?

[Gambit]

Move the variable not the code for adding lines to it.

[iTh3End]

If by "my window is not open" you mean it doesn't appear though your application is running - have you put the necessary dlls in the working directory of your program?

i mean window very soon closed after opening,

[eXpl0it3r]

Can you show your new, complete and minimal code?