Difference between revisions of "love.update"

(add another example)
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Nothing.
 
Nothing.
 
== Examples ==
 
== Examples ==
Run a function called think inside a table called npc approximately once per second.
+
Run a function called ''think'' inside a table called ''npc'' once per second.
 
<source lang="lua">
 
<source lang="lua">
 
dtotal = 0
 
dtotal = 0
Line 21: Line 21:
 
end
 
end
 
</source>
 
</source>
Change a variable at a constant rate (3 per second).
+
Change a variable ''var'' at a constant rate (+/- 3 per second in this example).
 
<source lang="lua">
 
<source lang="lua">
 
var = 10
 
var = 10

Revision as of 05:06, 26 September 2011

Callback function used to update the state of the game every frame.

Function

Synopsis

love.update( dt )

Arguments

number dt
Time since the last update in seconds.

Returns

Nothing.

Examples

Run a function called think inside a table called npc once per second.

dtotal = 0
function love.update(dt)
  dtotal = dtotal + dt
  if dtotal > 1 then
    dtotal = dtotal - 1
    npc.think()
  end
end

Change a variable var at a constant rate (+/- 3 per second in this example).

var = 10
rate = 3 -- change to change the rate at which the var is changed
function love.update(dt)
   if love.keyboard.isDown("down") then
      var = var + (dt * rate)
   elseif love.keyboard.isDown("up") then
      var = var - (dt * rate)
   end
end

See Also


Other Languages