XML question?

[Guest mitch19542004]

Can anyone tell me why this is not working. (A:ELEVATOR TRIM INDICATOR,degrees) 5 == I know the syntax for the bitmaps and position and stuff are right. For some reason the "==" operator does not seem to be working. HEEEEELLLLLLLLPPPPP!!!!!!!!!!!!!Mitch

[Guest bartels]

I assume that you get exactly five degrees very rarely. Even 4.99999999 is truncated to 4. Use "near" for proper rouding before checking equality, or use a range around 5 degrees.(A:ELEVATOR TRIM INDICATOR,degrees) near 5 ==or(A:ELEVATOR TRIM INDICATOR,degrees) d 5.2 < r 4.8 > &&Arne Bartels

[Guest mitch19542004]

That was dead on, thanks Arne. Where did you learn XML? I have your Tutorial, but as you know that is very limited. Is there another source that I can get a hold off?Thanks again.Mitch

[Guest bartels]

I didn't learn XML at all, I just had a look at the default XML-gauges in FS002 an worked on. A lot of trial and error.I admittedly did know the general structure (visual part, mouse areas, variables, etc.) of gauges from programming C gauges for about six years or so.Actually the general XML structure is really straightforward and you can't "learn" it in my opinion. Have one look one it and you'll know the system. It helped me to know HTML structure beforehand. XML for gauges is another thing, all I wanted to achieve with my document (which isn't a tutorial!), was to help a bit over the first obstacles the avarage reader could experience. I didn't focus too much on the general structure of XML. I wrote down the things not easily understandable, e.g. the strange RPN usage (and what I was able to understand of course). So not a step by step turorial.To the special case of floats and equality: this is a problem you'll encounter on an almost daily basis in at any floating point operation in C/C++ and also XML for gauges (and possibly more languages). I could go in details, but just remeber NEVER check floats on equality, round first or use tolerance margins.Arne Bartels