Awesome

Tween class

Simple tween class. It just does the math.

Docs

Example

var style = document.getElementById('foo').style,
    tween = new Tween({
        easing: 'linear',   // linear, swing, cubic-in, bounce-past, so on ...
        duration: 'normal', // slow|normal|fast or milliseconds

        // "p" is the tween progress (number between 0 and 1)
        onFrame: function( p ){
            style.left = 200 + 400*p + 'px'; 
        }

        // More events:
        //
        // onEnd: function(){},
        // onBeforeEnd: function(){},
        // onFPSUpdate: function(){},
        // onStart: function(){},
        // onPause: function(){},
        // onResume: function(){},
        // onReverse: function(){},
        //
    });


    // Equivalent syntax
    tween = new Tween(function( p ){
        style.left = 200 + 400*p + 'px';
    }, {
        easing: 'linear',
        duration: 'normal'
    });
    
    // Start your tween
    tween.start();

API

tween.start();

tween.start(delay);

tween.stop();

tween.stop(clearQueue);

tween.pause();

tween.resume();

tween.reverse();

tween.restart();

tween.finish();

Properties

tween.reversed

true if tween is currently reversed.

tween.state

if( tween.state === Tween.states.READY ){
    // Do something if tween is finished
}

states: {
    'READY':    READY,
    'TWEEN':    TWEEN,
    'DELAY':    DELAY,
    'PAUSED':   PAUSED,
    'STOPPING': STOPPING
}

Events

onFrame: function(p){}

This is the place to put your animation logic. p is the tween progress (number between 0 and 1).

onEnd: function(){}

onBeforeEnd: function(){}

This event can be used to do something right before the tween is over (like reverse the tween). See the demos for examples.

onStart: function(){}

onPause: function(){}

onResume: function(){}

onReverse: function(){}

Setup FPS counter:

Tween.setFPSCounterListener(function(fps){
    console.log(fps);
});

Licence

MIT

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.