Difference between revisions of "dt"

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dt is the most common shorthand for delta-time, which is usually passed through [[love.update]] to represent the amount of time which has passed since it was last called. It is in seconds, but because of the speed of modern processors is usually smaller than 1 (values like 0.01 is common).
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dt is the most common shorthand for delta-time, which is usually passed through [[love.update]] to represent the amount of time which has passed since it was last called. It is in seconds, but because of the speed of modern processors is usually smaller than 1 (values like 0.01 are common).
  
 
== Examples ==
 
== Examples ==

Revision as of 17:42, 30 July 2011

dt is the most common shorthand for delta-time, which is usually passed through love.update to represent the amount of time which has passed since it was last called. It is in seconds, but because of the speed of modern processors is usually smaller than 1 (values like 0.01 are common).

Examples

Increase a variable x by 1 every second

x = 0
function love.update(dt)
   x = x + dt
end


Change a position x at a fixed speed while a key is held down

x = 0
speed = 32
function love.update(dt)
   if love.keyboard.isDown("right") then
      x = x + (speed * dt)  -- x will increase by 32 for every second right is held down
   elseif love.keyboard.isDown("left") then
      x = x - (speed * dt)
   end
end

See Also