why cant i add dt to a variable

[Zaneishere]

So, i am trying to make a timer but when i tried to add dt to a variable it only gave me a error that says tried to do arithmetic on local dt

Code: Select all

d = 0

function timer(dt)
  d = d + dt
    love.graphics.print(d)
end

the function timer(dt) is in the update function also in the draw function

Code: Select all

function p:update(dt)
  self.y = self.y + self.speed * dt
  timer(dt)
  self:decreas(dt)
  self:releas()
  self:gravity1(dt)
  if m then self:move(dt) end
end

pleas tell me if i did something wrong and how do i fix it

[GVovkiv]

I guess, that you trying to use dt in love.draw(), since i don't see it in your post
(Maybe full source?)
If you doing something like:

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love.draw = function(dt)
foo = foo + bar * dt
end

It will not work, since love.draw don't give dt as argument, it only happens for love.update(dt), so love throws error about non-number value, which in that case == nil
And if i'm right, just do all your update stuff, well, in update function and never in love.draw
If you absolutly need it, you can use love.timer.getDelta() for that (https://love2d.org/wiki/love.timer.getDelta)

[ToastersUnited]

Make sure that when your calling p:update(dt) in main.lua you include (dt) as an argument
Or else its something else
it can only be done in p:update btw
Edit: include timer() inside of p:update amd you can use dt there

[milon]

Where is p getting called from? Is it getting handed the 'dt' variable correctly?

You could trying this to get an idea of why the error is happening:

Code: Select all

function timer(dt)
  print(d)  -- this will give you console output showing if  d is okay
  print(dt) -- this will give you console output showing if dt is okay
  d = d + dt
    love.graphics.print(d)
end

[Zaneishere]

Where is p getting called from? Is it getting handed the 'dt' variable correctly?

You could trying this to get an idea of why the error is happening:

Code: Select all

function timer(dt)
  print(d)  -- this will give you console output showing if  d is okay
  print(dt) -- this will give you console output showing if dt is okay
  d = d + dt
    love.graphics.print(d)
end

il try dat also p is a table short for player and ty for the idea
update: i tried your solution and it works ty

[milon]

update: i tried your solution and it works ty

Huh. My "solution" was just for getting more feedback. It shouldn't have changed anything functionally, but I'm glad it works now!

[Zaneishere]

update: i tried your solution and it works ty

Huh. My "solution" was just for getting more feedback. It shouldn't have changed anything functionally, but I'm glad it works now!

the problem was me printing the variable in the function instead of putting it straight to love.draw