On Thu, Jan 19, 2006 at 09:36:38PM +0000, AJ MacLeod wrote:
> I am in need of some sage advice on property listeners. Could someone
> enlighten me on the easiest way to convert the following type of function to
> respond to, for example, the "sim/model/lightning/controls/flight/ap_pitch"
> property?
If you want to listen to a property that changes several times
per frame, then a simple settimer loop is the best thing to do.
A timer value of 0 makes sure that the function is run once per
frame. Otherwise (and if the property is not tied!) a listener
function is the way to go.
> # Pitch Hold / Off
> autpilot_pitch = func {
>
> aircraftpitch = getprop('orientation/pitch-deg[0]');
>
> on = arg[0];
>
> if ( on != '1' ) {
> setprop("autopilot/locks/altitude[0]", "");
> setprop("sim/model/lightning/controls/flight/ap_pitch", "0");
> setprop("autopilot/gui/alt-active[0]", "false");
> }
> else {
> setprop("sim/model/lightning/controls/flight/ap_pitch", "1");
> setprop("autopilot/settings/target-pitch-deg[0]", aircraftpitch);
> setprop("autopilot/locks/altitude[0]", "pitch-hold");
> }
> } # end function
autopilot_pitch = func {
new_ap_pitch = cmdarg().getValue();
...
}
setlistener("sim/model/lightning/controls/flight/ap_pitch", autopilot_pitch);
m.
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