On 28 Jan 2010, at 03:45, Ron Jensen wrote:
> Here is a nasal function to determine if a frequency is a localizer. It
> accepts a frequency in megahertz and returns "1" if the frequency is an
> ILS frequency.
>
>
> var isILS=func(freq) {
> if(freq < 108.10) return 0;
> if(freq > 111.95) return 0;
> var bar=int((freq+0.001)*10)-int(freq)*10;
> return(bits.test(bar,0));
> }
A general observation - it'd be much better to request C++ properties /
native-nasal functions that implement such logic, rather than coding it up in
Nasal (in each aircraft / instrument).
Individually each function is trivial but it does add up to a lot of Nasal
being run. I've seen other code manually computing if a VOR is in range, and
various other mathematical / trigonometric / geometric operations. In practice
the CPU hit is probably negligible, but semantically, the C++ code is already
computing all this stuff - if it's not being exposed (via properties), or being
exposed badly or unhelpfully, then I'd much prefer people complain loudly about
the fact, here.
As Syd already mentioned, this is a case in point with the nav/nav-loc property
... both that it exists, but also that it wasn't working right - but will be
(again), soon.
Regards,
James
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