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SVG.FX = function(element) {
/* store target element */
this.target = element
}
//
SVG.extend(SVG.FX, {
// Add animation parameters and start animation
animate: function(duration, ease) {
/* ensure default duration and easing */
duration = duration == null ? 1000 : duration
ease = ease || '<>'
var akeys, tkeys, skeys
, element = this.target
, fx = this
, start = new Date().getTime()
, finish = start + duration
/* start animation */
this.interval = setInterval(function(){
// This code was borrowed from the emile.js micro framework by Thomas Fuchs, aka MadRobby.
var i, key
, time = new Date().getTime()
, pos = time > finish ? 1 : (time - start) / duration
/* collect attribute keys */
if (akeys == null) {
akeys = []
for (key in fx.attrs)
akeys.push(key)
}
/* collect transformation keys */
if (tkeys == null) {
tkeys = []
for (key in fx.trans)
tkeys.push(key)
}
/* collect style keys */
if (skeys == null) {
skeys = []
for (key in fx.styles)
skeys.push(key)
}
/* apply easing */
pos = ease == '<>' ?
(-Math.cos(pos * Math.PI) / 2) + 0.5 :
ease == '>' ?
Math.sin(pos * Math.PI / 2) :
ease == '<' ?
-Math.cos(pos * Math.PI / 2) + 1 :
ease == '-' ?
pos :
typeof ease == 'function' ?
ease(pos) :
pos
/* run all position properties */
if (fx._move)
element.move(fx._at(fx._move.x, pos), fx._at(fx._move.y, pos))
else if (fx._center)
element.center(fx._at(fx._center.x, pos), fx._at(fx._center.y, pos))
/* run all size properties */
if (fx._size)
element.size(fx._at(fx._size.width, pos), fx._at(fx._size.height, pos))
/* animate attributes */
for (i = akeys.length - 1; i >= 0; i--)
element.attr(akeys[i], fx._at(fx.attrs[akeys[i]], pos))
/* animate transformations */
for (i = tkeys.length - 1; i >= 0; i--)
element.transform(tkeys[i], fx._at(fx.trans[tkeys[i]], pos))
/* animate styles */
for (i = skeys.length - 1; i >= 0; i--)
element.style(skeys[i], fx._at(fx.styles[skeys[i]], pos))
/* callback for each keyframe */
if (fx._during)
fx._during.call(element, pos, function(from, to) {
return fx._at({ from: from, to: to }, pos)
})
/* finish off animation */
if (time > finish) {
clearInterval(fx.interval)
fx._after ? fx._after.apply(element, [fx]) : fx.stop()
}
}, duration > 10 ? 10 : duration)
return this
}
// Add animatable attributes
, attr: function(a, v, n) {
if (typeof a == 'object')
for (var key in a)
this.attr(key, a[key])
else
this.attrs[a] = { from: this.target.attr(a), to: v }
return this
}
// Add animatable transformations
, transform: function(t, v) {
for (var key in t)
this.trans[key] = { from: this.target.trans[key], to: t[key] }
return this
}
// Add animatable styles
, style: function(s, v) {
if (typeof s == 'object')
for (var key in s)
this.style(key, s[key])
else
this.styles[s] = { from: this.target.style(s), to: v }
return this
}
// Add animatable move
, move: function(x, y) {
var box = this.target.bbox()
this._move = {
x: { from: box.x, to: x }
, y: { from: box.y, to: y }
}
return this
}
// Add animatable size
, size: function(width, height) {
if (this.target instanceof SVG.Text) {
/* animate font size for Text elements */
this.attr('font-size', width)
} else {
/* animate bbox based size for all other elements */
var box = this.target.bbox()
this._size = {
width: { from: box.width, to: width }
, height: { from: box.height, to: height }
}
}
return this
}
// Add animatable center
, center: function(x, y) {
var box = this.target.bbox()
this._move = {
x: { from: box.cx, to: x - box.width / 2 }
, y: { from: box.cy, to: y - box.height / 2 }
}
return this
}
// Add callback for each keyframe
, during: function(during) {
this._during = during
return this
}
// Callback after animation
, after: function(after) {
this._after = after
return this
}
// Stop running animation
, stop: function() {
/* stop current animation */
clearInterval(this.interval)
/* reset storage for properties that need animation */
this.attrs = {}
this.trans = {}
this.styles = {}
this._move = null
this._size = null
this._after = null
this._during = null
return this
}
// Private: at position according to from and to
, _at: function(o, pos) {
/* number recalculation */
return typeof o.from == 'number' ?
o.from + (o.to - o.from) * pos :
/* unit recalculation */
SVG.regex.unit.test(o.to) ?
this._unit(o, pos) :
/* color recalculation */
o.to && (o.to.r || SVG.Color.test(o.to)) ?
this._color(o, pos) :
/* for all other values wait until pos has reached 1 to return the final value */
pos < 1 ? o.from : o.to
}
// Private: tween unit
, _unit: function(o, pos) {
var match, from
/* convert FROM unit */
match = SVG.regex.unit.exec(o.from.toString())
from = parseFloat(match[1])
/* convert TO unit */
match = SVG.regex.unit.exec(o.to)
return (from + (parseFloat(match[1]) - from) * pos) + match[2]
}
// Private: tween color
, _color: function(o, pos) {
var from, to
/* normalise pos */
pos = pos < 0 ? 0 : pos > 1 ? 1 : pos
/* convert FROM */
from = new SVG.Color(o.from)
/* convert TO hex to rgb */
to = new SVG.Color(o.to)
/* tween color and return hex */
return new SVG.Color({
r: ~~(from.r + (to.r - from.r) * pos)
, g: ~~(from.g + (to.g - from.g) * pos)
, b: ~~(from.b + (to.b - from.b) * pos)
}).toHex()
}
})
//
SVG.extend(SVG.Element, {
// Get fx module or create a new one, then animate with given duration and ease
animate: function(duration, ease) {
return (this.fx || (this.fx = new SVG.FX(this))).stop().animate(duration, ease)
},
// Stop current animation; this is an alias to the fx instance
stop: function() {
this.fx.stop()
return this
}
})
// Usage:
// rect.animate(1500, '>').move(200, 300).after(function() {
// this.fill({ color: '#f06' })
// })
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