Frame Rate

Definition

[h2]qg.setPreferredFramesPerSecond(number fps)

• Description

  Changes the rendering frame rate. The default rendering frame rate is 60 fps. After the rendering frame rate is changed, the callback frequency of requestAnimationFrame changes as well.

• Parameters

  Parameter	Type	Mandatory	Description
  fps	number	Yes	The value ranges from 1 to 60.

[h2]requestAnimationFrame(function callback)

• Description

  Requests an animation frame. For details, please refer to the HTML5 standards.

• Parameters

  Parameter	Type	Mandatory	Description
  callback	function	Yes	Callback function executed for the next drawing.

• Returns

  Request ID.

• Sample code

  var id = requestAnimationFrame(
          function(){console.log("requestAnimationFrame");}
  );

[h2]cancelAnimationFrame(number id)

• Description

  Cancels a callback request registered using the requestAnimationFrame method.

• Parameters

  Parameter	Type	Mandatory	Description
  id	number	Yes	ID returned when the requestAnimationFrame method is used to register a callback request.

• Sample code

  cancelAnimationFrame(666);