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animation.js
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animation.js
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var requestFrame = require('ainojs-requestframe')
var EventMixin = require('ainojs-events')
// util for current timestamp
var now = function() {
return +new Date()
}
// collect animations
var isSleeping = true
var sleep = function() {
isSleeping = true
}
var tickers = []
var tick = function() {
var willTick = false
var n = now()
tickers.forEach(function(anim, i) {
if ( anim.isRunning ) {
willTick = true
anim.elapsed += n - anim.timer
anim.timer = n
if ( anim.elapsed > anim.duration )
return anim.end()
anim.eachAnims(function(a, i) {
a.value = anim.obj[i] = anim.config.easing(null, anim.elapsed, a.from, a.distance, anim.duration)
})
anim.trigger('frame', {
values: anim.obj
})
}
})
if( willTick ) {
isSleeping = false
requestFrame(tick)
} else
sleep()
}
var wake = function() {
isSleeping && tick()
}
var Animation = function(options) {
options = options || {}
this.config = {
easing: function(x,t,b,c,d) {
return -c * ((t=t/d-1)*t*t*t - 1) + b // easeOutQuart
},
duration: 400,
delay: 0,
repeat: false,
yoyo: false
}
for (var i in options)
this.config[i] = options[i]
this.uid = Math.round(Math.random()*Math.pow(9,9))
this.animations = {}
this.obj = {}
this.timer = 0
this.elapsed = 0
this.duration = this.config.duration
this.kill = false
return this
}
var proto = Animation.prototype
EventMixin.call(proto)
proto.eachAnims = function(fn) {
for( var i in this.animations )
fn.call(this, this.animations[i], i)
},
proto.init = function(initialValues) {
for (var i in initialValues) {
if ( typeof this.animations[i] != 'object' )
this.animations[i] = { value: initialValues[i] }
}
this.obj = initialValues
this.trigger('frame', {
values: initialValues
})
this.isRunning = false
tickers.push(this)
return this
}
proto.animateTo = function(destinationValues, skipDelay) {
if ( this.config.delay && !skipDelay && !this.isRunning ) {
var args = [].slice.call(arguments).concat([true])
setTimeout(function() {
this.animateTo.apply(this, args)
}.bind(this), this.config.delay)
return
}
if ( typeof destinationValues == 'undefined' )
throw 'No destination values'
for (var i in destinationValues) {
var a = this.animations[i]
if ( typeof a == 'undefined')
throw 'Animation "'+i+'" has not been initialized. Use animation.init() to set default values'
a.from = a.value
a.to = destinationValues[i]
a.distance = a.to - a.value
}
this.isRunning = true
this.timer = now()
this.elapsed = 0
wake()
return this
}
proto.isAnimating = function() {
return !!this.isRunning
}
proto.pause = function() {
this.isRunning = false
return this
}
proto.resume = function() {
this.isRunning = true
this.timer = now()
wake()
return this
}
proto.updateTo = function(destinationValues) {
this.duration -= this.elapsed
if ( this.duration > 0 )
this.animateTo(destinationValues)
return this
}
proto.end = function() {
var end = {}
this.eachAnims(function(a, i) {
end[i] = a.to
})
this.trigger('frame', {
values: end
})
this.trigger('complete')
this.isRunning = false
this.duration = this.config.duration
if ( this.config.yoyo ) {
var start = {}
this.eachAnims(function(a, i) {
start[i] = a.from
})
this.animateTo(start)
} else if ( this.config.repeat ) {
this.eachAnims(function(a, i) {
this.obj[i] = a.value = a.from
})
this.animateTo(end)
}
return this
}
proto.destroy = function() {
this.isRunning = false
tickers.forEach(function(tick, i) {
if ( this.uid === tick.uid )
tickers.splice(i, 1)
}.bind(this))
}
// static utils
Animation.cleanUp = function() {
tickers = []
}
module.exports = Animation