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tween.js
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tween.js
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/*
FILE ARCHIVED ON 3:58:21 Dec 6, 2015 AND RETRIEVED FROM THE
INTERNET ARCHIVE ON 15:51:22 Aug 21, 2016.
JAVASCRIPT APPENDED BY WAYBACK MACHINE, COPYRIGHT INTERNET ARCHIVE.
ALL OTHER CONTENT MAY ALSO BE PROTECTED BY COPYRIGHT (17 U.S.C.
SECTION 108(a)(3)).
*/
////
// Tween.js
// Provides numerical obj property animation with easing.
// Copyright (c) 2005 - 2008 Joseph Huckaby
////
var TweenManager = {
_tweens: {},
_nextId: 1,
add: function(_args) {
// add new tween to table
var _tween = new Tween(_args);
this._tweens[ this._nextId ] = _tween;
_tween.id = this._nextId;
this._nextId++;
return _tween;
},
logic: function(clock) {
// update tweens
for (var _id in this._tweens) {
var _tween = this._tweens[_id];
_tween.logic(clock);
if (_tween.destroyed) delete this._tweens[_id];
}
},
removeAll: function() {
// remove all tweens
if (arguments.length) {
var criteria = arguments[0];
var num_crit = 0;
for (var key in criteria) num_crit++;
for (var id in this._tweens) {
var tween = this._tweens[id];
var matched = 0;
for (var key in criteria) {
if (tween[key] == criteria[key]) matched++;
}
if (matched == num_crit) {
tween.destroyed = 1;
delete this._tweens[id];
}
}
}
else {
for (var id in this._tweens) {
var tween = this._tweens[id];
tween.destroyed = 1;
}
this._tweens = {};
}
}
};
TweenManager.tween = TweenManager.add;
// Tween Object
function Tween(_args) {
// create new tween
// args should contain:
// target: target object
// duration: length of animation in logic frames
// mode: EaseIn, EaseOut, EaseInOut (omit or empty string for linear)
// algorithm: Quadtaric, etc.
// properties: { x: {start:0, end:150}, y: {start:0, end:250, filter:Math.floor} }
if (!_args.algorithm && _args.algo) { _args.algorithm = _args.algo; delete _args.algo; }
if (!_args.properties && _args.props) { _args.properties = _args.props; delete _args.props; }
for (var _key in _args) this[_key] = _args[_key];
// linear shortcut
if (!this.mode) this.mode = 'EaseIn';
if (!this.algorithm) this.algorithm = 'Linear';
this.require('target', 'duration', 'properties');
// if (typeof(this.target) != 'object') return alert("Tween: Target is not an object");
if (typeof(this.duration) != 'number') return alert("Tween: Duration is not a number");
if (typeof(this.properties) != 'object') return alert("Tween: Properties is not an object");
// setup properties
for (var _key in this.properties) {
var _prop = this.properties[_key];
if (typeof(_prop) == 'number') _prop = this.properties[_key] = { end: _prop };
if (typeof(_prop) != 'object') return alert("Tween: Property " + _key + " is not the correct format");
if (typeof(_prop.start) == 'undefined') _prop.start = this.target[_key];
if (_prop.start.toString().match(/^([\d\.]+)([a-zA-Z]+)$/) && !_prop.suffix) {
_prop.start = RegExp.$1;
_prop.suffix = RegExp.$3;
_prop.end = _prop.end.toString().replace(/[^\d\.]+$/, '');
}
if ((typeof(_prop.start) != 'number') && _prop.start.toString().match(/^\d+\.\d+$/)) {
_prop.start = parseFloat( _prop.start );
}
else if ((typeof(_prop.start) != 'number') && _prop.start.toString().match(/^\d+$/)) {
_prop.start = parseInt( _prop.start, 10 );
}
if ((typeof(_prop.end) != 'number') && _prop.end.toString().match(/^\d+\.\d+$/)) {
_prop.end = parseFloat( _prop.end );
}
else if ((typeof(_prop.end) != 'number') && _prop.end.toString().match(/^\d+$/)) {
_prop.end = parseInt( _prop.end, 10 );
}
if (typeof(_prop.start) != 'number') return alert("Tween: Property " + _key + ": start is not a number");
if (typeof(_prop.end) != 'number') return alert("Tween: Property " + _key + ": end is not a number");
if (_prop.filter && (typeof(_prop.filter) != 'function')) return alert("Tween: Property " + _key + ": filter is not a function");
}
}
Tween.prototype.destroyed = false;
Tween.prototype.delay = 0;
Tween.prototype.require = function() {
// make sure required class members exist
for (var _idx = 0, _len = arguments.length; _idx < _len; _idx++) {
if (typeof(this[arguments[_idx]]) == 'undefined') {
return alert("Tween: Missing required parameter: " + arguments[_idx]);
}
}
return true;
};
Tween.prototype.logic = function(clock) {
// abort if our target is destroyed
// (and don't call onTweenComplete)
if (this.target.destroyed) {
this.destroyed = true;
return;
}
if (this.delay > 0) {
this.delay--;
if (this.delay <= 0) this.start = clock;
else return;
}
if (!this.start) this.start = clock;
// calculate current progress
this.amount = (clock - this.start) / this.duration;
if (this.amount >= 1.0) {
this.amount = 1.0;
this.destroyed = true;
}
// animate obj properties
for (var _key in this.properties) {
var _prop = this.properties[_key];
var _value = _prop.start + (ease(this.amount, this.mode, this.algorithm) * (_prop.end - _prop.start));
if (_prop.filter) _value = _prop.filter( _value );
/* console.log( "tweening: " + _key + ": " + serialize({
id: this.id,
amount: this.amount,
start: _prop.start,
end: _prop.end,
mode: this.mode,
algorithm: this.algorithm,
value: _value
}) ); */
this.target[_key] = _prop.suffix ? ('' + _value + _prop.suffix) : _value;
}
// notify object that things are happening to it
if (this.onTweenUpdate) this.onTweenUpdate(this);
if (this.target.onTweenUpdate) this.target.onTweenUpdate(this);
if (this.destroyed) {
if (this.onTweenComplete) this.onTweenComplete(this);
if (this.target.onTweenComplete) this.target.onTweenComplete(this);
}
};
// Static Utility Function for tweening a single property to a single point in an animation
function tweenFrame(_start, _end, _amount, _mode, _algo) {
return _start + (ease(_amount, _mode, _algo) * (_end - _start));
}
//
// Easing functions
//
var EaseAlgos = {
Linear: function(_amount) { return _amount; },
Quadratic: function(_amount) { return Math.pow(_amount, 2); },
Cubic: function(_amount) { return Math.pow(_amount, 3); },
Quartetic: function(_amount) { return Math.pow(_amount, 4); },
Quintic: function(_amount) { return Math.pow(_amount, 5); },
Sine: function(_amount) { return 1 - Math.sin((1 - _amount) * Math.PI / 2); },
Circular: function(_amount) { return 1 - Math.sin(Math.acos(_amount)); }
};
var EaseModes = {
EaseIn: function(_amount, _algo) { return EaseAlgos[_algo](_amount); },
EaseOut: function(_amount, _algo) { return 1 - EaseAlgos[_algo](1 - _amount); },
EaseInOut: function(_amount, _algo) {
return (_amount <= 0.5) ? EaseAlgos[_algo](2 * _amount) / 2 : (2 - EaseAlgos[_algo](2 * (1 - _amount))) / 2;
}
};
function ease(_amount, _mode, _algo) {
return EaseModes[_mode]( _amount, _algo );
}