[ALLEGRO 5] KEY QUEUE

#include<allegro5\allegro5.h>
#include<allegro5\allegro_native_dialog.h>
#include<allegro5\allegro_primitives.h>

#define ScreenWidth 800
#define ScreenHeight 600

int main()
{
    ALLEGRO_DISPLAY * display;
   
    display = al_create_display( ScreenWidth, ScreenHeight );
   
    al_set_window_position( display, 200, 200 );
   
    bool done = false;
    int x = 10, y = 10, moveSpeed = 5;
   
    al_init_primitives_addon();
    al_install_keyboard();
   
    ALLEGRO_EVENT_QUEUE * event_queue = al_create_event_queue();
    al_register_event_source( event_queue, al_get_keyboard_event_source() );
   
    while( !done )
    {
        ALLEGRO_EVENT events;
        al_wait_for_event( event_queue, & events );
       
        if( events.type == ALLEGRO_EVENT_KEY_DOWN )
        {
            switch( events.keyboard.keycode )
            {
            case ALLEGRO_KEY_DOWN:
                y += moveSpeed;
                break;
            case ALLEGRO_KEY_UP:
                y -= moveSpeed;
                break;
            case ALLEGRO_KEY_RIGHT:
                x += moveSpeed;
                break;
            case ALLEGRO_KEY_LEFT:
                x -= moveSpeed;
                break;
            case ALLEGRO_KEY_ESCAPE:
                done = true;
                break;
            }
        }
       
        al_draw_rectangle( x, y, x + 10, y + 10, al_map_rgb( 44, 117, 255 ), 1 );
        al_flip_display();
        al_clear_to_color( al_map_rgb( 0, 0, 0 ) );
    }
    al_destroy_display( display );
    al_destroy_event_queue( event_queue );
   
    return 0;
}