Music syncing

See BEATBEAN.js

The bpm and subdivision of beats can be defined in the nin.json file in the root folder of your project.

{
  "name": "My awesome demo!",
  "music": {
    "bpm": 120,
    "subdivision": 4
  }
}

The global variable BEAT will be true on each frame that is on a BEAT. The global variable BEAN will increase by one each time BEAT is true.

In addition the helper methods BEAN_FOR_FRAME and FRAME_FOR_BEAN can be used for doing fancy calculations and finding appropriate BEAN values in your layer.

A common pattern is to use expressions like BEAT && BEAN % 4 == 0. This will evaluate to true on every 4th BEAT, starting with the first one. In a song with a subdivision of 4, this means the first beat of each bar in the song.