Mouse position (dx/dy,dcx,dcy) reset to 0 with a wheel event

[FractalWire]

Hello again,

I have a new problem, this time with the wheel event. I have a handle_events() function that could look like this :

def handle_events(events):
    key = tcod.Key()
    mouse = tcod.Mouse()
    evnt_masks = tcod.EVENT_KEY_PRESS | tcod.EVENT_MOUSE
    while tcod.sys_check_for_event(evnt_masks, key, mouse):
        if key.vk == tcod.KEY_ESCAPE:
            raise SystemExit()
        print(mouse.cx,mouse.cy,mouse.x,mouse.y)

Everything is fine when I move my mouse around, but when I wheel up/down, the value printed are 0 (except the last one=1 for some reason) So it seems to reset the mouse position whenever I wheel up/down.

[HexDecimal]

This isn't a bug, SDL2 doesn't return the mouse position on a mouse wheel event (but it does on a wheel click.)

The tcod.sys_check_for_event returns the events type, this should be used instead of giving it a partial event mask, like in the following example:

def handle_events(events):
    key = tcod.Key()
    mouse = tcod.Mouse()
    while True:
        ev = tcod.sys_check_for_event(tcod.EVENT_ANY, key, mouse)
        if not ev:
            break
        if ev & tcod.EVENT_KEY_PRESS:
            if key.vk == tcod.KEY_ESCAPE:
                raise SystemExit()
        if ev & tcod.EVENT_MOUSE_MOVE:
            print(mouse.cx,mouse.cy,mouse.x,mouse.y)

[HexDecimal]

Actually, I might have been too quick to judge this. This could a regression in behavior, since mouse wheel events are put into TCOD_EVENT_MOUSE_PRESS for some reason.

[HexDecimal]

The regression is fixed in 8.4.1 and in libtcod. Mouse wheel events in libtcodpy are now back to their usual undefined behavior of preserving coordinates from previous mouse events.

[FractalWire]

Perfect, thanks !