Defined in Module impact.timer, inherits from ig.Class


var timer = new ig.Timer();

// Difference between current time and the time .set(); // => 0

// Set the timer to 5 seconds in the future
timer.set( 5 );; // => -5

// ... one second later; // => -4

// ... 5 more seconds later; // => 1


The ig.Timer has two distinct modes of operation. You can either get the difference (.delta()) between the current time and the timers target time (as set by the constructor or .set()) or just get the current tick - the time since the last call to .tick().

All timers are only updated once for each frame. So calling .delta() on one timer several times during one frame, will result in the exact same return value.

ig.Timer does not measure real time, but game time. Game time can progress slower than the real time, when the browser can't keep up with executing the game loop several times (default 20) per second. See ig.Timer.maxStep.

How fast the game time progresses is also depended on the global ig.Timer.timeScale property.

Be aware, that all time intervals are in seconds, as opposed to JavaScripts milliseconds.


new ig.Timer( [seconds] )



Returns the time in seconds relative to the timers target time. See .set().

If the target time is in the future, the return value of this function will be negative (e.g. -5 for 5 seconds in the future). If the target time is in the past, the return value will be positive. It essentially returns the time "since" the target time.

If you, for instance, want to measure how long the player took to finish a level of your game, just create a new timer when the level starts and call .delta() when the level ends.

// at level start
var playTimer = new ig.Timer(); // no "target" time given = NOW.

// ... at level end
var timeNeeded =;

// reset the timer at the start of the next level


New in 1.20

Pauses the timer. Calling .delta() for paused timers will always return the same value. .tick() will return 0.

Calling .unpause(), .set() or .reset() unpauses the timer.


New in 1.20

Resumes a paused timer.


Reset the starting time for this timer. This does not reset the target time.

var timer = new ig.Timer( 5 );

// ... one second later; // => -4

timer.reset();; // => -5

.set( [seconds] )

Resets the starting time for this timer and sets the relative target time. Default 0.

var timer = new ig.Timer( 5 );

// ... one second later; // => -4

timer.set( 3 );; // => -3


Get the time since the last call to .tick() for this timer. Note that, since ig.Timer represents game time, it does not update during a single frame. E.g.:

var timer = new ig.Timer();

timer.tick(); // => 0
doSomethingVeryComplicatedThatTakesAFewSeconds( andBlocksEverything );
timer.tick(); // => 0

A global tick, updated each frame, is also provided at ig.system.tick.

Global properties


The max time step. The game time will never advance more than this per frame. The default is 0.05, which equals a minimum frame rate of 20 fps. If the browser is unable to run at at least 20 fps, the game is essentially slowed down.


Game time factor. With a value of 0.5 the game will run in slow motion, with 2 it will run at twice the speed. The default is 1.