Relative Mouse Movement (Mouse Capture)

[Robert42]

can sf::sleep be used in multiple threads?

[eXpl0it3r]

Sure but you have to call it from each thread, i.e. if just call it in the main thread, thread X won't be affected.
sf::sleep simply lets the current thread sleep for x time units.

[greeniekin]

I actually have troubles with this in source engine games.

I have 2 screens so even fullscreen(only one screen) I can still loose focus if I move the mouse really quickly to the right and left click.

It infuriates me that the source engine still has not worked that out.

This should be pretty easy to implement. I have played with this before on windows.

Here is all you need. It locks the cursor to an area. You will need to resize it with the window.
http://msdn.microsoft.com/en-us/library/windows/desktop/ms648383(v=vs.85).aspx

XGrabPointer might work on linux. Never used it though.

With mac I have no idea.

I could make a patch for this with the go ahead on the api implementation from Laurent.(not mac. I do not own one)
Of course for the time for him to decide on the api he could implement it himself.


I suppose something like this
void Window::lockMouseCursor(bool locked)
bool Window::isLockMouseCursor()

though sfml uses set and get everywhere. So i suppose

void Window::setMouseCursorLocked(bool locked)
bool Window::getMouseCursorLocked()

[Oberon]

If this is ever going to be implemented, Chrome might serve as a reference implementation: http://code.google.com/p/chromium/source/search?q=%3A%3ALockMouse%5C%28%5C%29.

[Hiura]

thanks! it's indeed useful if we do it one day.

[Robert42]

We could create a fork, implement it by ourselves (1 persen per system) and create a pull request

[Weeve]

Notes:

• I call my sf::RenderWindow 'App'
• _'Name' designates a variable owned by a class
• Have not tested with 2D SFML, this is logic, so it should be applicable
• Code Snippets in order of being called

Event triggers for focus:

sf::Event Event;
while (getApp()->GetEvent(Event)){
        if (Event.Type == sf::Event::Closed){
                getApp()->Close();
        }else if (Event.Type == sf::Event::Resized){
                _ScreenSize = sf::Vector2<int> (Event.Size.Width, Event.Size.Height);
                if (_ScreenSize.y < _ScreenSize.x){
                        glViewport(0, (_ScreenSize.y-_ScreenSize.x)/2, _ScreenSize.x, _ScreenSize.x);
                }else{
                        glViewport((_ScreenSize.x-_ScreenSize.y)/2, 0, _ScreenSize.y, _ScreenSize.y);
                }
        }else if (Event.Type == sf::Event::GainedFocus){
                _InFocus = true;
        }else if (Event.Type == sf::Event::LostFocus){
                _InFocus = false;
        }else if (Event.Type == sf::Event::MouseButtonPressed){
                _InFocus = true;
        }else if ((Event.Type == sf::Event::KeyPressed) && (Event.Key.Code == sf::Key::Escape)){
                _InFocus = false;
        }
}
 

Resetting the mouse:

if (Cam->_CursorLocked){
        if (_InFocus){
                _App.ShowMouseCursor(false);
                _App.SetCursorPosition(_ScreenSize.x/2,_ScreenSize.y/2);
        }else{
                _App.ShowMouseCursor(true);
        }
}else{
        _App.ShowMouseCursor(true);
}
 

Getting relative mouse movements:

sf::Vector2<float> MouseMove = sf::Vector2<float> (App->GetInput().GetMouseX()-ScreenSize.x/2 ,App->GetInput().GetMouseY()-ScreenSize.y/2);