Hello,

I've been experimenting mouse implementation and have noticed that when I move my mouse within the display window, the incrementation speed also increases. Here is my code:

bool running = false;

int pos_x = 0;
int pos_y = 0;
int increment = 0;

int main()
{
al_init();
al_install_mouse();
al_install_keyboard();
al_init_image_addon();
al_init_font_addon();
al_init_ttf_addon();

ALLEGRO_DISPLAY* display = al_create_display(SCREEN_WIDTH, SCREEN_HEIGHT);
ALLEGRO_EVENT_QUEUE* event_queue = al_create_event_queue();
ALLEGRO_FONT* font25 = al_load_ttf_font("slkscr.ttf", 25, 0);
ALLEGRO_TIMER* timer = al_create_timer(1.0 / MAX_FPS);

al_register_event_source(event_queue, al_get_timer_event_source(timer));
al_register_event_source(event_queue, al_get_keyboard_event_source());
al_register_event_source(event_queue, al_get_mouse_event_source());

al_start_timer(timer);

while (!running)
{
ALLEGRO_EVENT ev;

al_wait_for_event(event_queue, &ev);

if (ev.type == ALLEGRO_EVENT_MOUSE_AXES)
{
pos_y = ev.mouse.y;
pos_x = ev.mouse.x;
}

al_clear_to_color(al_map_rgb(RED));

++increment;

al_draw_textf(font25, al_map_rgb(BLACK), 0, 0, 0, "POS X: %i", pos_x);
al_draw_textf(font25, al_map_rgb(BLACK), 0, 50, 0, "POS Y: %i", pos_y);

al_draw_textf(font25, al_map_rgb(BLACK), 0, 100, 0, "INC: %i", increment);
al_flip_display();
}
}

Why is this happening / how do I fix this?

I put your code in <code> </code> tags.

Because it's incremented every time there is a mouse event. It's probably better to have the loop run at fixed speed, only update and draw when you get a timer event.

switch statements are one way

switch (ev.type)
{
case ALLEGRO_TIMER:
{
} break;

case ALLEGRO_EVENT_MOUSE_AXES:
{
} break;
}

You will want a flag to know if it's time to draw/update, so more like:

You're missing a break statement after the body of each case. Without a break statement, the execution "falls through" from the ALLEGRO_EVENT_MOUSE_AXES case block to the ALLEGRO_EVENT_TIMER case block. Just add a break after line 16 and one after line 21. Remember, as you add more cases, you'll want to add these break statements as well to prevent this issue (or a different issue) in the future.