What happens when a key is pressed in SDL?

What happens when a key is pressed in SDL?

One table, in which you set keys true or false based on the SDL keydown/keyup events, and another one, that you initialize with false. When checking keyPressed, you just compare the second table key with the first table key, and if different, if second table key is false, then it was pressed, else it was released.

How does key repeat work in SDL 2.0?

When I order to move to the left by pressing left arrow, it is processed by SDL_PollEvents () and responds correctly if the key was pressed once. However, if I keep the key pressed, I get a short delay (as long as Windows key repeat delay) before moving continuously.

How many booleans should you have in SDL?

You should have 2 tables of booleans for keys. One table, in which you set keys true or false based on the SDL keydown/keyup events, and another one, that you initialize with false.

Which is an example of an event in SDL?

Now, I know you can get the events with SDL like OnKeyPressed, OnKeyReleased, OnKeyHit, etc, but I want to know how to build functions like ‘KeyPressed’ that returns a boolean, instead of being an event. Example: I know you have already selected an answer.. but here is some actual code of how I typically do it with one array. 🙂

What are the functions of the keyboardimulator package?

This package provide 6 functions which are developed in C++: keybd.press () Simulate keyboard key presses. Multiple keys can be pressed simultaneously by using + as separator. keybd.release () Simulate the release of keyboard keys held by keybd.press.

How can I read events from the SDL?

Before we can read events SDL must be initialised with SDL_Init and a video mode must be set using SDL_SetVideoMode. There are, however, two other functions we must use to obtain all the information required.

Which is an event in the SDL event Union?

The SDL_KeyboardEvent describes a keyboard event (obviously). The key member of the SDL_Event union is a SDL_KeyboardEvent structure. The type field specifies whether the event is a key release (SDL_KEYUP) or a key press (SDL_KEYDOWN) event.

How is SDL _ keyDown and key recognition not working properly?

(I got the 771 code by printing the event.type whenever a key is being pressed). You call SDL_PollEvent () only once, so it gives the event which occurred first which might not be SDL_KEYDOWN. This loop takes care of the events which you don’t care about (for e.g. MOUSEMOTION ).

What happens when there is no new event in SDL?

SDL_PollEvent will not change the content of the event you pass through if there is no new event to report. This means that type == SDL_KEYDOWN will stay true until some other event arrives. You need to check the value returned from SDL_PollEvent and only continue on to your event handling code when there is a new event to handle.

How to use SDL _ pollevent only once?

You call SDL_PollEvent () only once, so it gives the event which occurred first which might not be SDL_KEYDOWN. This loop takes care of the events which you don’t care about (for e.g. MOUSEMOTION ). And you can also use switch with event.type if you are going to handle many different types of events.

How can I remove this delay in c-sdl2?

This works fine, but if I want a continuous input when the key is held down (e.g. to move a character), there is a slight delay before SDL notices that the key is being repeated. In SDL 1.2, it was possible to set this delay using a function call. Now it is no longer (as far as I’m aware). How can I remove this delay?

Can a bool be a key in SDL?

Since you’re not getting an SDL_KEYUP you can just have a bool that’s true until you get a SDL_KEYUP Of course you’ll need something to store all keys, like an array. ( Or even better; use C++ with std::map) Then you can use the SDL_Keycode ( event.key.keysym.sym ) as key.

What does the getkeyboardstate function in SDL do?

Returns a pointer to an array of key states. The pointer returned is a pointer to an internal SDL array. It will be valid for the whole lifetime of the application and should not be freed by the caller. A array element with a value of 1 means that the key is pressed and a value of 0 means that it is not.

Can you have a SDL _ Keyup before a keyDown?

You can’t have an SDL_KEYUP before an SDL_KEYDOWN. If SDL_EnableKeyRepeat (0, 0); is not working for you, then you should assume it is not reliable and not use it. Build your own key-repeat handling logic like lionesmiz hinted at.