calculate degrees with lua

[spinter]

I can to help solve this problem?

 

Point A Target

Point B My Plane

Direction My Plane: 90

Direction to take for the goal: 123

How can I calculate this degree to my plane?

It should be about 220!

[sobek]

What direction is it you want to know, the direction your plane has to fly to get to the target? Do you mean course with your aircraft and not a compass as reference?

 

If so, in your picture, the direction to take for the goal is

 

modulo(123+180, 360) = 237°

if direction_goal >= direction_airplane
   course = direction_goal - direction_airplane
else
   course = 360 - direction_airplane + direction_goal
end

This is all pseudo code because i'm not intimately familiar with lua.

Edited May 22, 2013 by sobek

[spinter]

Great, thanks very close but we had managed wrong

 

 

my course is your right thanks!

 

 
my error

if ely_mia_direzione > 180 then
dir_1= (360 - ely_mia_direzione) + (ely_direzione_oby)
else
dir_1 = ely_direzione_oby - ely_mia_direzione
end

[sobek]

You're welcome. :)

[Headspace]

Quickest way: Take the arctangent of the result of dividing the rise over the run from the aircraft to target. Convert result to degrees and then add degrees based on quadrant.