jframes

jframes

A light weight animation frame support. With the frame object, you are convinent to do some calculation.

The Frame Object

The frame object will pass in the jframes.request() callback. It providers:

• frame.time time in javascript (eg. +new Date()).
• frame.index index of the requested frame sequence base on zero.
• frame.dur the duration time from current frame to the last frame in ms.
• frame.elapsed the elapsed time from the first frame to current frame in ms.
• frame.next() tells jframes to execute the next frame, if this method are not called, the animation stops.

Usage

If you want to request a frame, just call jframes.request()

var req = jframes.request(function(frame) {
  console.log('avg frame rate: ' + frame.elapsed / (frame.index + 1));
  
  // render stuff
  
  frame.next(); // call the next frame
});

// jframes.release(req); // release resources

The function pass to jframes.request() will generate a frame sequence correspond to the function. The function will be the action of the frame sequence.

We keep track of frame informations for every frame sequence. You can use jframes.request() multi times without worry of calculation. For example:

jframes.request(function(frame) {
  if (frame.index < 5) {
    console.log('frame seq 1: frame %d executed!', frame.index);
    frame.next();
  }
});

jframes.request(function(frame) {
  if (frame.index < 10) {
    console.log('frame seq 2: frame %d executed!', frame.index);
    frame.next();
  }
});