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This thread is locked; no one can reply to it.
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| get all pressed keys? |
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Shadowblitz16
Member #16,818
March 2018
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does anybody know how to get all currently pressed keys? I have a function called getMouseButtons which does this.. 1 int getMouseButtons()
2 {
3 ALLEGRO_MOUSE_STATE state;
4 al_get_mouse_state(&state);
5 return state.buttons;
6 }
and I( was trying to make a keyboard version.. 1 int getKeyboardKeys()
2 {
3 ALLEGRO_KEYBOARD_STATE state;
4 al_get_keyboard_state(&state);
5 return state.keys;
6 }
the problem is ALLEGRO_KEYBOARD_STATE doesn't have a member called keys like ALLEGRO_MOUSE_STATE has a member called buttons. |
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MikiZX
Member #17,092
June 2019
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With ALLEGRO_KEYBOARD_STATE you have to use function called al_key_down ( https://www.allegro.cc/manual/5/al_key_down ) to read a single key. Otherwise if the function alone is not sufficient and you would like to always have something similar to the mouse buttons variable then you will need to create an array of keys and update it yourself by reading each key. Something along the lines of: bool pressed_key[ALLEGRO_KEY_MAX]; ... al_get_keyboard_state(&kbdstate); for (int i=0; i<ALLEGRO_KEY_MAX; ++i) { if (al_key_down(&kbdstate, i)) pressed_key[i] = true; else pressed_key[i] = false; }
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Edgar Reynaldo
Major Reynaldo
May 2007
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Polling is outdated, and honestly shouldn't have been included in A5. :/ The proper way to monitor the state of the keyboard and mouse is through the event system. If you poll, you stand the risk of losing events in-between polls. Some example code to get you started : 1int main(int argc , char** argv) {
2
3//...
4 ALLEGRO_EVENT_QUEUE* q = al_create_event_queue();
5 if (!q) {Bail();}
6
7 al_register_event_source(q , al_get_keyboard_event_source());
8 al_register_event_source(q , al_get_mouse_event_source());
9 al_register_event_source(q , al_get_display_event_source(display));
10
11 /// Some variables to track our key and mouse state
12 int mx = 0;
13 int my = 0;
14 int mb = 0;/// bitfield
15
16 bool keys[ALLEGRO_KEY_MAX] = {0};
17
18 /// Typical event loop
19 bool quit = false;
20 bool redraw = true;
21
22 while (!quit) {
23 if (redraw) {
24 Draw();
25 redraw = false;
26 }
27 do {
28 ALLEGRO_EVENT e;
29 al_wait_for_event(q , &e);
30 if (e.type == ALLEGRO_EVENT_DISPLAY_CLOSE) {
31 quit = true;
32 }
33 if (e.type == ALLEGRO_EVENT_KEY_DOWN && e.keyboard.keycode == ALLEGRO_KEY_ESCAPE) {
34 quit = true;
35 }
36 if (e.type == ALLEGRO_EVENT_KEY_DOWN) {
37 keys[e.keyboard.keycode] = true;
38 }
39 if (e.type == ALLEGRO_EVENT_KEY_UP) {
40 keys[e.keyboard.keycode] = false;
41 }
42 if (e.type == ALLEGRO_EVENT_MOUSE_BUTTON_DOWN) {
43 mb |= (1 << e.mouse.button);
44 }
45 if (e.type == ALLEGRO_EVENT_MOUSE_BUTTON_UP) {
46 mb &= ~(1 << e.mouse.button);
47 }
48 if (e.type == ALLEGRO_EVENT_MOUSE_AXES) {
49 mx = e.mouse.x;
50 my = e.mouse.y;
51 }
52 } while (!al_is_event_queue_empty(q));
53 }
54
55 return 0;
56}
My Website! | EAGLE GUI Library Demos | My Deviant Art Gallery | Spiraloid Preview | A4 FontMaker | Skyline! (Missile Defense) Eagle and Allegro 5 binaries | Older Allegro 4 and 5 binaries | Allegro 5 compile guide |
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Shadowblitz16
Member #16,818
March 2018
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can events be used in a way that I can do.. I would rather not have to keep my game logic in main's events |
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Edgar Reynaldo
Major Reynaldo
May 2007
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Yes. You can use pointers, you can pass variables, you can do whatever you want. Hint (you only need one event loop) My Website! | EAGLE GUI Library Demos | My Deviant Art Gallery | Spiraloid Preview | A4 FontMaker | Skyline! (Missile Defense) Eagle and Allegro 5 binaries | Older Allegro 4 and 5 binaries | Allegro 5 compile guide |
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Shadowblitz16
Member #16,818
March 2018
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hmm ok I think I am going to go with this.. 1bool pressed_key[ALLEGRO_KEY_MAX];
2...
3al_get_keyboard_state(&kbdstate);
4for (int i=0; i<ALLEGRO_KEY_MAX; ++i)
5{
6 if (al_key_down(&kbdstate, i))
7 pressed_key[i] = true;
8 else
9 pressed_key[i] = false;
10}
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