How to determine the direction vector of an object when turning?

Question

Game development

I rotate an object with:

function endlessRolling(tank1)
  tank1.rotation = 0
  transition.to(tank1, {time=2000, rotation = 360, onComplete = endlessRolling})
end
endlessRolling(tank1)

For movement I want to use setLinearVelocity. The documentation says it has 2 values ​​object:setLinearVelocity( xVelocity, yVelocity ), but I can't figure out which values ​​to use. How to determine the vector where the object is directed in order to use it in the game?
(Sorry for the photo quality)

Answer 1

Found the answer myself. For anyone interested: https://stackoverflow.com/questions/11343097/coron...