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SVG.FX = function FX(e) {
// store target element
this.target = e;
};
// add FX methods
SVG.extend(SVG.FX, {
// animation parameters and animate
animate: function(duration, ease) {
// ensure default duration adn easing
duration = duration || 1000;
ease = ease || '<>';
var akeys, tkeys, tvalues,
element = this.target,
fx = this,
start = (new Date).getTime(),
finish = start + duration;
// start animation
this.interval = setInterval(function(){
var i,
time = (new Date).getTime(),
pos = time > finish ? 1 : (time - start) / duration;
// collect attribute keys
if (akeys == null) {
akeys = [];
for (var k in fx.attrs)
akeys.push(k);
};
// collect transformation keys
if (tkeys == null) {
tkeys = [];
for (var k in fx.trans)
tkeys.push(k);
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 (i = akeys.length - 1; i >= 0; i--)
element.attr(akeys[i], fx._at(fx.attrs[akeys[i]], pos));
// animate transformations
if (tkeys.length > 0) {
for (i = tkeys.length - 1; i >= 0; i--)
tvalues[tkeys[i]] = fx._at(fx.trans[tkeys[i]], pos);
element.transform(tvalues);
}
// finish off animation
if (time > finish) {
clearInterval(fx.interval);
fx._after ? fx._after.apply(element) : fx.stop();
}
}, 10);
return this;
},
// animated attributes
attr: function(a, v, n) {
if (typeof a == 'object')
for (var k in a)
this.attr(k, a[k]);
else
this.attrs[a] = { from: this.target.attr(a), to: v };
},
// animated transformations
transform: function(o) {
for (var k in o)
this.trans[k] = { from: this.target.trans[k], to: o[k] };
return this;
},
// animated move
move: function(x, y) {
var b = this.target.bbox();
this._move = {
x: { from: b.x, to: x },
y: { from: b.y, to: y }
};
return this;
},
// animated size
size: function(w, h) {
var b = this.target.bbox();
this._size = {
width: { from: b.width, to: w },
height: { from: b.height, to: h }
};
return this;
},
// animated center
center: function(x, y) {
var b = this.target.bbox();
this._move = {
x: { from: b.cx, to: x },
y: { from: b.cy, to: y }
};
return this;
},
// stop animation
stop: function() {
// stop current animation
clearInterval(this.interval);
// create / 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, p) {
// if a number, calculate pos
return typeof o.from == 'number' ?
o.from + (o.to - o.from) * p :
// if animating to a color
o.to.r || /^#/.test(o.to) ?
this._color(o, p) :
// for all other values wait until pos has reached 1 to return the final value
p < 1 ? o.from : o.to;
},
// private: tween color
_color: function(o, p) {
// convert hex to rgb and store it for further reference
if (typeof o.from !== 'object')
o.from = this._h2r(o.from || '#000');
// convert hex to rgb and store it for further reference
if (typeof o.to !== 'object')
o.to = this._h2r(o.to);
// tween color and return hex
return this._r2h({
r: ~~(o.from.r + (o.to.r - o.from.r) * p),
g: ~~(o.from.g + (o.to.g - o.from.g) * p),
b: ~~(o.from.b + (o.to.b - o.from.b) * p)
});
},
// private: convert hex to rgb object
_h2r: function(h) {
// parse full hex
var m = /^#?([a-f\d]{2})([a-f\d]{2})([a-f\d]{2})$/i.exec(this._fh(h));
// if the hex is successfully parsed, return it in rgb, otherwise return black
return m ? {
r: parseInt(m[1], 16),
g: parseInt(m[2], 16),
b: parseInt(m[3], 16)
} : { r: 0, g: 0, b: 0 };
},
// private: convert rgb object to hex string
_r2h: function(r) {
return '#' + (r.r + 256 * r.g + 65536 * r.b).toString(16);
},
// private: force potential 3-based hex to 6-based
_fh: function(h) {
return h.length == 4 ?
[ '#',
h.substring(1, 2), h.substring(1, 2),
h.substring(2, 3), h.substring(2, 3),
h.substring(3, 4), h.substring(3, 4)
].join('') : h;
}
});
// delay: delay animation for a given amount of ms
// after: callback for when animation has finished
['delay', 'after'].forEach(function(m) {
SVG.FX.prototype[m] = function(v) {
this['_' + m] = v;
return this;
};
});
// make SVG.Element FX-aware
SVG.extend(SVG.Element, {
// get fx module or create a new one, then animate with given ms and ease
animate: function(d, e) {
return (this._fx || (this._fx = new SVG.FX(this))).stop().animate(d, e);
},
// stop current animation
stop: function() {
this._fx.stop();
return this;
}
});
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