* Justin Smithies -- Monday 06 March 2006 13:40:
> But just to get me going could you write it out as if it
> was doing the following in script form.
> That should help me heaps to understand this and keep me busy too ;)
>
> Say i wanted to monitor the /engines/engine[0]/cutoff property.
> If it ever changed to true i would like to erm just for the sake of it say
> turn /engines/engine[0]/reverse to true.
Assuming that you only want changes from "false" to "true",
then you'd write something like that:
last_cutoff = 0;
setlistener("/engines/engine[0]/cutoff", func {
var new_cutoff = cmdarg().getBoolValue();
if (new_cutoff and !last_cutoff) {
setprop("/engines/engine[0]/reverse", 1);
}
last_cutoff = new_cutoff;
}, 1);
... because the function isn't really only called on property
changes, but rather whenever the property is written to. Even
if it's the same value that's written. The 1 in the last line
makes sure that an initially "true" cutoff also sets the
reverser, which you may or may not want.
m.
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