Automatically creating trailer

[kerts93]

Hey again,

I've got one small question.

Is it possible, that server automatically creates trailer 591 and attaches it to vehicle 514 if it's created (by map file, by script or by command (that spawns a vehicle). Basically spawns+attaches the trailer every time a specific id vehicle is created?

[dzek (varez)]

hmm, by map - not possible with pure event, but possible with something like:

  
-- server: 
function getPositionRelatedToVehicle(theVeh, x, y) 
    local xx, yy, zz = getElementPosition(theVeh) 
    local rx, ry, rot = getElementRotation(theVeh) 
    local lx = xx + math.sin (math.rad(-rot)) * x 
    local ly = yy + math.cos (math.rad(-rot)) * y 
    return lx,ly 
end 
  
addEvent("onVehicleSpawn", false) 
addEventHandler("onVehicleSpawn", getRootElement() function() 
  -- source = spawned vehicle 
  if (getElementModel(source)== 514) then 
    local x,y,z = getElementPosition(source) 
    local rx, ry, rz = getElementRotation(source) 
    local lx, ly = getPositionRelatedToVehicle(source, -3, -3) 
    local trailer = createVehicle(591, lx, ly, z) 
    setElementRotation(trailer, 0, 0, rz) 
    attachTrailerToVehicle(trailer, source) 
  end 
end) 
  
setTimer(function() 
  local vehs = getElementsByType('vehicle') 
  for key,val in ipairs(vehs) do 
    local ed = getElementData(val, "spawnedEventTriggered") 
    if (ed ~= true) then 
      setElementData(val, "spawnedEventTriggered") 
      triggerEvent("onVehicleSpawn", val) 
    end 
  end 
end, 500, 0) 
  

not tested. there is no other way afaik but remember - this can be cpu consuming when there is a lot of cars around the map (but i think it will be fine anyway)

[kerts93]

thanks, I'll try it out

This section:

addEventHandler("onVehicleSpawn", getRootElement() function() 
  -- source = spawned vehicle 
  if (getElementModel(source)== 514) then 
    local x,y,z = getElementPosition(source) 
    local rx, ry, rz = getElementRotation(source) 
    local lx, ly = getPositionRelatedToVehicle(source, -3, -3) 
    local trailer = createVehicle(591, lx, ly, z) 
    setElementRotation(trailer, 0, 0, rz) 
    attachTrailerToVehicle(trailer, source) 
  end 
end 

Gives me this error:

')' expected near 'function' line 33 which currently is line 1 here

' expected near 'end' line 43 which is last line here

[Castillo]

addEventHandler("onVehicleSpawn", getRootElement(), 
function() 
  -- source = spawned vehicle 
  if (getElementModel(source)== 514) then 
    local x,y,z = getElementPosition(source) 
    local rx, ry, rz = getElementRotation(source) 
    local lx, ly = getPositionRelatedToVehicle(source, -3, -3) 
    local trailer = createVehicle(591, lx, ly, z) 
    setElementRotation(trailer, 0, 0, rz) 
    attachTrailerToVehicle(trailer, source) 
  end 
end) 

[kerts93]

okey, now it keeps spawning trailers and console gives WARNING: lvrp\baas.lua:53: Bad argument @ 'setElementData'

[dzek (varez)]

fix that line with:

setElementData(val, "spawnedEventTriggered", true) 

[kerts93]

thanks, work's perfectly, but I had to swap in attachTrailerToVehicle trailer and source places. Also, added that newly created trailer uses same colors as the cab uses

Thanks for the help