Simple method for Centering Window Position

[zmertens]

I think it might be beneficial for the SFML library to have a quick method for setting the window in the user's screen center. I'm sure this has been thought of before by SFML devs, however, I don't see any discussion in the forums that I could find. Here's a quick and simple look at how I think it might be implemented in the Window class.

For instance, at line 220 in SFML/src/SFML/Window.cpp:

////////////////////////////////////////////////////////////
void Window::setPosition(const Vector2i& position)
{
    if (m_impl)
        m_impl->setPosition(position);
}

could be called using something like:

window.setPosition(sf::Vector2i(sf::Window::CenterHorizontal(), sf::Window::CenterVertical()));

Where sf::Window::CenterHorizontal/Vertical are static public methods that calculate the equivalent call:

window.setPosition(sf::Vector2i(sf::VideoMode::getDesktopMode().width * 0.5 - window.getSize().x * 0.5, sf::VideoMode::getDesktopMode().height * 0.5 - window.getSize().y * 0.5));
 

I'm sure there'd be better ways to implement this functionality within SFML's API but this was a quick way to illustrate what I was referring by setting the window to the user's screen center. I realize it's not very much code to replace but I think it does reduce some clutter in the call. Part of the inspiration was from SDL's library with regards to:

SDL_CreateWindow(titleString.c_str(), SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED, windowWidth, windowHeight, SDL_WINDOW_OPENGL);

[Laurent]

Adding a new function to the public API just to save one simple line of code on user side... you'll have to find more convincing arguments

By the way, your static functions wouldn't work, they have to know the size of the window so they must be non-static.

[Hapax]

the user's screen center

Which screen? 

[zmertens]

Yeah I thought about it some more in the morning and it seems pretty convoluted. I was also think adding something like a bit flag along with "sf::Style::Resizeable | sf::Style::CenterWindow" and what not but I don't that would be very elegant either.

Which screen? 

 Oh yeah ...

[Tank]

PySFML has some nice additions to sf::Rectangle that I really enjoyed: http://www.python-sfml.org/api/graphics.html#rectangle (right, bottom, center, size, position)