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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, tvalues,
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 index,
time = (new Date).getTime(),
pos = time > finish ? 1 : (time - start) / duration
/* collect attribute keys */
if (akeys == null) {
akeys = []
for (var key in fx.attrs)
akeys.push(key)
}
/* collect transformation keys */
if (tkeys == null) {
tkeys = []
for (var key in fx.trans)
tkeys.push(key)
tvalues = {}
}
/* 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.move(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 (index = akeys.length - 1; index >= 0; index--)
element.attr(akeys[index], fx._at(fx.attrs[akeys[index]], pos))
/* animate transformations */
if (tkeys.length > 0) {
for (index = tkeys.length - 1; index >= 0; index--)
tvalues[tkeys[index]] = fx._at(fx.trans[tkeys[index]], pos)
element.transform(tvalues)
}
/* 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(o) {
for (var key in o)
this.trans[key] = { from: this.target.trans[key], to: o[key] }
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) {
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 },
y: { from: box.cy, to: y }
}
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._move = null
this._size = null
this._after = null
return this
},
// Private: at position according to from and to
_at: function(o, pos) {
/* if a number, recalculate pos */
return typeof o.from == 'number' ?
o.from + (o.to - o.from) * pos :
/* if animating to a color */
o.to.r || /^#/.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 color
_color: function(o, pos) {
var from, to
/* convert FROM hex to rgb */
from = this._h2r(o.from || '#000')
/* convert TO hex to rgb */
to = this._h2r(o.to)
/* tween color and return hex */
return this._r2h({
r: ~~(from.r + (to.r - from.r) * pos),
g: ~~(from.g + (to.g - from.g) * pos),
b: ~~(from.b + (to.b - from.b) * pos)
})
},
// Private: convert hex to rgb object
_h2r: function(hex) {
/* parse full hex */
var match = /^#?([a-f\d]{2})([a-f\d]{2})([a-f\d]{2})$/i.exec(this._fh(hex))
/* if the hex is successfully parsed, return it in rgb, otherwise return black */
return match ? {
r: parseInt(match[1], 16),
g: parseInt(match[2], 16),
b: parseInt(match[3], 16)
} : { r: 0, g: 0, b: 0 }
},
// Private: convert rgb object to hex string
_r2h: function(rgb) {
return '#' + this._c2h(rgb.r) + this._c2h(rgb.g) + this._c2h(rgb.b)
},
// Private: convert component to hex
_c2h: function(c) {
var hex = c.toString(16)
return hex.length == 1 ? '0' + hex : hex
},
// Private: force potential 3-based hex to 6-based
_fh: function(hex) {
return hex.length == 4 ?
[ '#',
hex.substring(1, 2), hex.substring(1, 2),
hex.substring(2, 3), hex.substring(2, 3),
hex.substring(3, 4), hex.substring(3, 4)
].join('') : hex
}
})
//
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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