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Help => General => Topic started by: nullGrind on February 01, 2010, 06:37:33 pm

Title: Parallel Keyinput
Post by: nullGrind on February 01, 2010, 06:37:33 pm

Hello Guys its me again.

I wonder if it is possible to have more then 2 parallel Keyboard-Inputs at once.
I tried Eventlistener triggering bool variables and i also tried the (Game.GetInput().IsKeyDown(sf::Key::M)) option. But somehow SFML is only reading two pressed keys at once.
For example when im accelerating and steering i cant shoot at the same time or when im shooting and accelerating im not able to steer anylonger.

Title: Parallel Keyinput
Post by: Laurent on February 01, 2010, 06:46:49 pm

Are you saying that when you press multiple keys at the same time, some of them are ignored?

Title: Parallel Keyinput
Post by: nullGrind on February 01, 2010, 06:52:48 pm

Yes exactly. And it always depends on the order im pressing the keys. When i first press accelerate (and keep it pressed) then steer i cannot shot. When i first hold steer, then shoot i cannot accelerate.

here is some code:

Code: [Select]


        if (Game.GetInput().IsKeyDown(sf::Key::Right))
            direction -= rotateSpeed;
        if (Game.GetInput().IsKeyDown(sf::Key::Left))
            direction += rotateSpeed;

        if (Game.GetInput().IsKeyDown(sf::Key::M)) {
            inertiaX += -speedRocket * sin(direction * radian);
            inertiaY += -speedRocket * cos(direction * radian);
        }
        if (Game.GetInput().IsKeyDown(sf::Key::N) && shotTimer > 10)
            shot = true;

Title: Parallel Keyinput
Post by: Laurent on February 01, 2010, 07:21:11 pm

This is not related to SFML, this is a limitation of your keyboard. Usual keyboards are limited to 3 or 4 keys, this is due to how they are wired inside.

Title: Parallel Keyinput
Post by: nullGrind on February 02, 2010, 12:07:42 am

Thanks Laurent. You have been right.
I changed the Keys i have to press on the keyboard and now everything works just fine. Weird problem.

Title: Parallel Keyinput
Post by: Laurent on February 02, 2010, 08:55:57 am

Quote

Weird problem.

Well, you can find interesting readings about how keyboards work internally. Most of them are wired more or less like a matrix, so you can guess which combinations will work (ie. keys that are not on the same physical row or column).