Re: Scope of FlightGear Actions

--===============4741933795419253315==
Content-Type: multipart/alternative; boundary="0000000000008a28bf065681552c"

--0000000000008a28bf065681552c
Content-Type: text/plain; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

My idea of actions is that they are responses to events.

Is a property change enough to trigger an action?

YAGNI applies. to the "sequence of actions" idea.

You've indicated that an action can have state.  What do you have in mind
for storing that state? Properties, special structures owned by specific
action objects?

EG: Fuel Indicator with 2**n discrete values needed for driving a physical
display based on a stepper or servo,  vs floating point with 1,728,000
discrete values,  changing by a couple of .05ml droplets of fuel at twice
the frame rate. (C172P @ 9 gallons/hr)

   - Calculate the filtered value on change (pre-action)  state value from
   property
   - (condition as part of action) If the previous action value was
   different, fire the action, if the same, don't (conditional action)
   previous value stored as state (how) or (condition part of code triggere=
d
   by action)
   - Could an action be defined as "send this value to a queue of updates
   for physical cockpit devices?"
   - Could an action trigger a network or USB output? (post-action)


-Pat



On Fri, Jul 10, 2026 at 8:23=E2=80=AFAM James Turner <[email protected]>=
 wrote:

>
>
> On 5 Jul 2026, at 20:07, Patrick Callahan <[email protected]> wrote=
:
>
> FlightGear Epic: Actions -
> https://gitlab.com/groups/flightgear/-/work_items/18
>
> I'm wondering if there should also be a definition of a sequence of
> actions, in which several different defined actions are performed in a
> specified order at a specific cadence.
>
> Can anyone provide a use case for such a feature that fits within the
> general direction of this epic?
>
> I have not considered sequencing actions, but I did define the option tha=
t
> when extending an action, the addtional bindings can be pre-, post- or
> replace. (Depending on the action security level, so an aircraft or add-o=
n
> can=E2=80=99t eg replace the =E2=80=98pause=E2=80=99 binding=E2=80=A6)
>
> I think pre- and post- bindings should cover the use cases I envisage, bu=
t
> if you have a concrete one that needs true sequencing, let=E2=80=99s hear=
 it. Since
> one obvious binding is to run some Nasal, I=E2=80=99d guess that would be=
 one easy
> sequencing mechanism, of course.
>
> Kind regards,
> James
>
> _______________________________________________
> Flightgear-devel mailing list
> [email protected]
> https://lists.sourceforge.net/lists/listinfo/flightgear-devel
>

--0000000000008a28bf065681552c
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr">My idea of actions is that they are responses to events.=
=C2=A0=C2=A0<div><br></div><div>Is a property change enough to trigger an a=
ction?<div><br><div><span style=3D"background-color:transparent">YAGNI appl=
ies. to the &quot;sequence of actions&quot; idea.</span></div><div><br></di=
v><div>You&#39;ve indicated that an action can have state.=C2=A0 What do yo=
u have in mind for storing that state? Properties, special structures owned=
 by specific action objects?</div><div><br></div><div>EG: Fuel Indicator=C2=
=A0<span style=3D"background-color:transparent">with 2**n discrete values n=
eeded for driving a physical display based on a stepper or servo,=C2=A0 vs =
floating point with 1,728,000 discrete values,=C2=A0 changing=C2=A0by a cou=
ple of .05ml droplets of fuel at twice the frame rate. (C172P @ 9 gallons/h=
r)</span></div><div><ul><li>Calculate the filtered value on change (pre-act=
ion)=C2=A0 state value from property</li><li>(condition as part of action) =
If the previous action value was different, fire the action, if the same, d=
on&#39;t (conditional action) previous value stored as state (how) or (cond=
ition part of code triggered by action)</li><li>Could an action be defined =
as &quot;send<span style=3D"background-color:transparent"> this value to a =
queue of updates for physical cockpit </span>devices?<span style=3D"backgro=
und-color:transparent">&quot;</span></li><li>Could an action trigger a netw=
ork or USB output? (post-action)</li></ul></div><div><div><div><br></div><d=
iv>-Pat</div><div><br></div></div><div><br></div></div></div></div></div><b=
r><div class=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail_attr">On Fri, =
Jul 10, 2026 at 8:23=E2=80=AFAM James Turner &lt;<a href=3D"mailto:james@fl=
ightgear.org" target=3D"_blank">[email protected]</a>&gt; wrote:<br></di=
v><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;borde=
r-left:1px solid rgb(204,204,204);padding-left:1ex"><div><br id=3D"m_218556=
2827338820784m_8013457345664580672lineBreakAtBeginningOfMessage"><div><br><=
blockquote type=3D"cite"><div>On 5 Jul 2026, at 20:07, Patrick Callahan &lt=
;<a href=3D"mailto:[email protected]" target=3D"_blank">pat.callahan1=
@gmail.com</a>&gt; wrote:</div><br><div><span style=3D"font-family:Helvetic=
a;font-size:12px;font-style:normal;font-variant-caps:normal;font-weight:400=
;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none=
;white-space:normal;word-spacing:0px;text-decoration-line:none;text-decorat=
ion-style:solid;border-style:none;background:none">FlightGear</span><span s=
tyle=3D"font-family:Helvetica;font-size:12px;font-style:normal;font-variant=
-caps:normal;font-weight:400;letter-spacing:normal;text-align:start;text-in=
dent:0px;text-transform:none;white-space:normal;word-spacing:0px;text-decor=
ation:none;float:none;display:inline"><span>=C2=A0</span>Epic: Actions -<sp=
an>=C2=A0</span></span><a href=3D"https://gitlab.com/groups/flightgear/-/wo=
rk_items/18" style=3D"font-family:Helvetica;font-size:12px;font-style:norma=
l;font-variant-caps:normal;font-weight:400;letter-spacing:normal;text-align=
:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:=
0px" target=3D"_blank">https://gitlab.com/groups/flightgear/-/work_items/18=
</a><div style=3D"font-family:Helvetica;font-size:12px;font-style:normal;fo=
nt-variant-caps:normal;font-weight:400;letter-spacing:normal;text-align:sta=
rt;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;=
text-decoration-line:none;text-decoration-style:solid"><p dir=3D"auto">I&#3=
9;m wondering if there should also be a definition of a sequence of actions=
, in which several different defined actions are performed in a specified o=
rder at a specific cadence.</p><p dir=3D"auto">Can anyone provide a use cas=
e for such a feature that fits within the general direction of this epic?</=
p></div></div></blockquote></div><div>I have not considered sequencing acti=
ons, but I did define the option that when extending an action, the addtion=
al bindings can be pre-, post- or replace. (Depending on the action securit=
y level, so an aircraft or add-on can=E2=80=99t eg replace the =E2=80=98pau=
se=E2=80=99 binding=E2=80=A6)</div><div><br></div><div>I think pre- and pos=
t- bindings should cover the use cases I envisage, but if you have a concre=
te one that needs true sequencing, let=E2=80=99s hear it. Since one obvious=
 binding is to run some Nasal, I=E2=80=99d guess that would be one easy seq=
uencing mechanism, of course.</div><div><br></div><div>Kind regards,</div><=
div>James</div><div><br></div></div>_______________________________________=
________<br>
Flightgear-devel mailing list<br>
<a href=3D"mailto:[email protected]" target=3D"_blank"=
>[email protected]</a><br>
<a href=3D"https://lists.sourceforge.net/lists/listinfo/flightgear-devel" r=
el=3D"noreferrer" target=3D"_blank">https://lists.sourceforge.net/lists/lis=
tinfo/flightgear-devel</a><br>
</blockquote></div>

--0000000000008a28bf065681552c--


--===============4741933795419253315==
Content-Type: text/plain; charset="us-ascii"
MIME-Version: 1.0
Content-Transfer-Encoding: 7bit
Content-Disposition: inline


--===============4741933795419253315==
Content-Type: text/plain; charset="us-ascii"
MIME-Version: 1.0
Content-Transfer-Encoding: 7bit
Content-Disposition: inline

_______________________________________________
Flightgear-devel mailing list
[email protected]
https://lists.sourceforge.net/lists/listinfo/flightgear-devel

--===============4741933795419253315==--