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morpheus.js
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morpheus.js
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/*!
* Morpheus - A Brilliant Animator
* https://github.com/ded/morpheus - (c) Dustin Diaz 2011
* License MIT
*/
!function (context, doc, win) {
var html = doc.documentElement,
rgbOhex = /^rgb\(|#/,
relVal = /^([+\-])=([\d\.]+)/,
numUnit = /^(?:[\+\-]=)?\d+(?:\.\d+)?(%|in|cm|mm|em|ex|pt|pc|px)$/,
// does this browser support the opacity property?
opasity = function () {
return typeof doc.createElement('a').style.opacity !== 'undefined';
}(),
// these elements do not require 'px'
unitless = { lineHeight: 1, zoom: 1, zIndex: 1, opacity: 1 },
// initial style is determined by the elements themselves
getStyle = doc.defaultView && doc.defaultView.getComputedStyle ?
function (el, property) {
var value = null;
var computed = doc.defaultView.getComputedStyle(el, '');
computed && (value = computed[camelize(property)]);
return el.style[property] || value;
} : html.currentStyle ?
function (el, property) {
property = camelize(property);
if (property == 'opacity') {
var val = 100;
try {
val = el.filters['DXImageTransform.Microsoft.Alpha'].opacity;
} catch (e1) {
try {
val = el.filters('alpha').opacity;
} catch (e2) {}
}
return val / 100;
}
var value = el.currentStyle ? el.currentStyle[property] : null;
return el.style[property] || value;
} :
function (el, property) {
return el.style[camelize(property)];
},
rgb = function (r, g, b) {
return '#' + (1 << 24 | r << 16 | g << 8 | b).toString(16).slice(1);
},
// convert rgb and short hex to long hex
toHex = function (c) {
var m = /rgba?\((\d+),\s*(\d+),\s*(\d+)/.exec(c);
return (m ? rgb(m[1], m[2], m[3]) : c)
.replace(/#(\w)(\w)(\w)$/, '#$1$1$2$2$3$3'); // short to long
},
// change font-size => fontSize etc.
camelize = function (s) {
return s.replace(/-(.)/g, function (m, m1) {
return m1.toUpperCase();
});
},
fun = function (f) {
return typeof f == 'function';
},
frame = function () {
// native animation frames
// http://webstuff.nfshost.com/anim-timing/Overview.html
// http://dev.chromium.org/developers/design-documents/requestanimationframe-implementation
return win.requestAnimationFrame ||
win.webkitRequestAnimationFrame ||
win.mozRequestAnimationFrame ||
win.oRequestAnimationFrame ||
win.msRequestAnimationFrame ||
function (callback) {
win.setTimeout(function () {
callback(+new Date());
}, 10);
};
}();
/**
* Core tween method that requests each frame
* @param duration: time in milliseconds. defaults to 1000
* @param fn: tween frame callback function receiving 'position'
* @param done {optional}: complete callback function
* @param ease {optional}: easing method. defaults to easeOut
* @param from {optional}: integer to start from
* @param to {optional}: integer to end at
* @returns method to stop the animation
*/
function tween(duration, fn, done, ease, from, to) {
ease = ease || function (t) {
// default to a pleasant-to-the-eye easeOut (like native animations)
return Math.sin(t * Math.PI / 2)
};
var time = duration || 1000,
diff = to - from,
start = +new Date(),
stop = 0,
end = 0;
frame(run);
function run(t) {
var delta = t - start;
if (delta > time || stop) {
to = isFinite(to) ? to : 1;
stop ? end && fn(to) : fn(to);
done && done();
return;
}
// if you don't specify a 'to' you can use tween as a generic delta tweener
// cool, eh?
isFinite(to) ?
fn((diff * ease(delta / time)) + from) :
fn(ease(delta / time));
frame(run);
}
return {
stop: function (jump) {
stop = 1;
end = jump; // jump to end of animation?
}
}
}
/**
* generic bezier method for animating x|y coordinates
* minimum of 2 points required (start and end).
* first point start, last point end
* additional control points are optional (but why else would you use this anyway ;)
* @param points: array containing control points
[[0, 0], [100, 200], [200, 100]]
* @param pos: current be(tween) position represented as float 0 - 1
* @return [x, y]
*/
function bezier(points, pos) {
var n = points.length, r = [], i, j;
for (i = 0; i < n; ++i) {
r[i] = [points[i][0], points[i][1]];
}
for (j = 1; j < n; ++j) {
for (i = 0; i < n - j; ++i) {
r[i][0] = (1 - pos) * r[i][0] + pos * r[parseInt(i + 1, 10)][0];
r[i][1] = (1 - pos) * r[i][1] + pos * r[parseInt(i + 1, 10)][1];
}
}
return [r[0][0], r[0][1]];
}
// this gets you the next hex in line according to a 'position'
function nextColor(pos, start, finish) {
var r = [], i, e;
for (i = 0; i < 6; i++) {
from = Math.min(15, parseInt(start.charAt(i), 16));
to = Math.min(15, parseInt(finish.charAt(i), 16));
e = Math.floor((to - from) * pos + from);
e = e > 15 ? 15 : e < 0 ? 0 : e;
r[i] = e.toString(16);
}
return '#' + r.join('');
}
// this retreives the frame value within a sequence
function getTweenVal(pos, units, begin, end, k, i, v) {
if (typeof begin[i][k] == 'string') {
return nextColor(pos, begin[i][k], end[i][k]);
} else {
// round so we don't get crazy long floats
v = Math.round(((end[i][k] - begin[i][k]) * pos + begin[i][k]) * 1000) / 1000;
// some css properties don't require a unit (like zIndex, lineHeight, opacity)
!(k in unitless) && (v += units[i][k] || 'px');
return v;
}
}
// support for relative movement via '+=n' or '-=n'
function by(val, start, m, r, i) {
return (m = relVal.exec(val)) ?
(i = parseFloat(m[2])) && (r = (start + i)) && m[1] == '+' ?
r : start - i :
parseFloat(val);
}
/**
* morpheus:
* @param element(s): HTMLElement(s)
* @param options: mixed bag between CSS Style properties & animation options
* - {n} CSS properties|values
* - value can be strings, integers,
* - or callback function that receives element to be animated. method must return value to be tweened
* - relative animations start with += or -= followed by integer
* - duration: time in ms - defaults to 1000(ms)
* - easing: a transition method - defaults to an 'easeOut' algorithm
* - complete: a callback method for when all elements have finished
* - bezier: array of arrays containing x|y coordinates that define the bezier points. defaults to none
* - this may also be a function that receives element to be animated. it must return a value
*/
function morpheus(elements, options) {
var els = elements ? (els = isFinite(elements.length) ? elements : [elements]) : [], i,
complete = options.complete,
duration = options.duration,
ease = options.easing,
points = options.bezier,
begin = [],
end = [],
units = [],
bez = [],
originalLeft,
originalTop;
delete options.complete;
delete options.duration;
delete options.easing;
delete options.bezier;
if (points) {
// remember the original values for top|left
originalLeft = options.left;
originalTop = options.top;
delete options.right;
delete options.bottom;
delete options.left;
delete options.top;
}
for (i = els.length; i--;) {
// record beginning and end states to calculate positions
begin[i] = {};
end[i] = {};
units[i] = {};
// are we 'moving'?
if (points) {
var left = getStyle(els[i], 'left'),
top = getStyle(els[i], 'top'),
xy = [by(fun(originalLeft) ? originalLeft(els[i]) : originalLeft || 0, parseFloat(left)),
by(fun(originalTop) ? originalTop(els[i]) : originalTop || 0, parseFloat(top))];
bez[i] = fun(points) ? points(els[i], xy) : points;
bez[i].push(xy);
bez[i].unshift([
parseInt(left, 10),
parseInt(top, 10)
]);
}
for (var k in options) {
var v = getStyle(els[i], k), unit,
tmp = fun(options[k]) ? options[k](els[i]) : options[k]
if (typeof tmp == 'string' &&
rgbOhex.test(tmp) &&
!rgbOhex.test(v)) {
delete options[k]; // remove key :(
continue; // cannot animate colors like 'orange' or 'transparent'
// only #xxx, #xxxxxx, rgb(n,n,n)
}
begin[i][k] = typeof tmp == 'string' && rgbOhex.test(tmp) ?
toHex(v).slice(1) :
parseFloat(v);
end[i][k] = typeof tmp == 'string' && tmp.charAt(0) == '#' ?
toHex(tmp).slice(1) :
by(tmp, parseFloat(v));
// record original unit
typeof tmp == 'string' && (unit = tmp.match(numUnit)) && (units[i][k] = unit[1]);
}
}
// ONE TWEEN TO RULE THEM ALL
return tween(duration, function (pos, v, xy) {
// normally not a fan of optimizing for() loops, but we want something
// fast for animating
for (i = els.length; i--;) {
if (points) {
xy = bezier(bez[i], pos);
els[i].style.left = xy[0] + 'px';
els[i].style.top = xy[1] + 'px';
}
for (var k in options) {
v = getTweenVal(pos, units, begin, end, k, i);
k == 'opacity' && !opasity ?
(els[i].style.filter = 'alpha(opacity=' + (v * 100) + ')') :
(els[i].style[camelize(k)] = v);
}
}
}, complete, ease);
}
// expose useful methods
morpheus.tween = tween;
morpheus.getStyle = getStyle;
morpheus.bezier = bezier;
typeof module !== 'undefined' && module.exports &&
(module.exports = morpheus);
context['morpheus'] = morpheus;
}(this, document, window);