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Topics - cob59

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Window / Splash screen
« on: July 22, 2020, 02:46:07 pm »
I'm having a few issues with windows using sf::Style::None to implement something like a splash screen.

#include <SFML/Graphics.hpp>

int main()
   sf::RenderWindow window(sf::VideoMode(200, 200), "SFML works!", sf::Style::None);

   // center the window
   sf::Vector2i splashOrig = {
      int(sf::VideoMode::getDesktopMode().width)  / 2 - int(window.getSize().x) / 2,
      int(sf::VideoMode::getDesktopMode().height) / 2 - int(window.getSize().y) / 2


   sf::CircleShape shape(100.f);

   bool dragging { false };
   sf::Vector2i dragAnchor;

   while (window.isOpen())
      sf::Event event;
      while (window.pollEvent(event))
         if (event.type == sf::Event::Closed)

         if (event.type ==  sf::Event::MouseButtonPressed)
            if (event.mouseButton.button == sf::Mouse::Left)
               dragging = true;
               dragAnchor = sf::Mouse::getPosition();

         if (event.type == sf::Event::MouseButtonReleased)
            if (event.mouseButton.button == sf::Mouse::Left)
               dragging = false;
               dragAnchor = {};

         if (dragging)
            auto currentPos = sf::Mouse::getPosition();
            auto deltaPos = dragAnchor - currentPos;

            window.setPosition(window.getPosition() - deltaPos);

            dragAnchor = sf::Mouse::getPosition();


   return 0;


1. I want my window to be positioned at the center of my main monitor on startup, but since I have 2 monitors the getDesktopMode() gives an area which is the sum of those 2 and the window ends up astride both. It kind of makes sense, but how can I set up "splashOrig" so that my window appears at the center of my main, or current, or any screen?

2. I'm trying to make the window movable by drag-n-dropping as you can see. It kind of works, but the anchor point I set when left-clicking isn't stuck to the cursor... the faster I move, the more it "drags behind".
I've already implemented an Image viewer before in SFML and I know you need mapPixelToCoords/mapCoordsToPixel transformations in some cases... so what am I missing?

PS: I'm aware using sf::Style::None and tweaking it so it behaves like an sf::Style::Default is a bit odd... I'm just testing the limits of the thing. If it's more convenient I'll go with sf::Style::Titlebar in order to move my splash screen around.

Feature requests / std::size_t instead of unsigned int
« on: November 10, 2014, 10:57:38 pm »
Hi :)
Just a quick suggestion about the types used for indexing.

I'm compiling a VC++ projects in 64bits right now and I've noticed some sf::VertexArray methods use the 32bits unsigned int (i.e. unsigned long) index types, even though their underneath std::vector<Vertex> uses the 64bits unsigned long long types.

This leads to unnecessary casts and warnings.

So I think you should use std::size_t for unsigned indexes and std::ptrdiff_t for the signed ones.

NB: I didn't check, but sf::VertexArray probably isn't the only concerned class.

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