/*
Script: Fx.Transitions.js
Contains a set of advanced transitions to be used with any of the Fx Classes.
License:
MIT-style license.
Credits:
Easing Equations by Robert Penner, , modified and optimized to be used with MooTools.
*/
(function(){
var old = Fx.prototype.initialize;
Fx.prototype.initialize = function(options){
old.call(this, options);
var trans = this.options.transition;
if (typeof trans == 'string' && (trans = trans.split(':'))){
var base = Fx.Transitions;
base = base[trans[0]] || base[trans[0].capitalize()];
if (trans[1]) base = base['ease' + trans[1].capitalize() + (trans[2] ? trans[2].capitalize() : '')];
this.options.transition = base;
}
};
})();
Fx.Transition = function(transition, params){
params = $splat(params);
return $extend(transition, {
easeIn: function(pos){
return transition(pos, params);
},
easeOut: function(pos){
return 1 - transition(1 - pos, params);
},
easeInOut: function(pos){
return (pos <= 0.5) ? transition(2 * pos, params) / 2 : (2 - transition(2 * (1 - pos), params)) / 2;
}
});
};
Fx.Transitions = new Hash({
linear: $arguments(0)
});
Fx.Transitions.extend = function(transitions){
for (var transition in transitions) Fx.Transitions[transition] = new Fx.Transition(transitions[transition]);
};
Fx.Transitions.extend({
Pow: function(p, x){
return Math.pow(p, x[0] || 6);
},
Expo: function(p){
return Math.pow(2, 8 * (p - 1));
},
Circ: function(p){
return 1 - Math.sin(Math.acos(p));
},
Sine: function(p){
return 1 - Math.sin((1 - p) * Math.PI / 2);
},
Back: function(p, x){
x = x[0] || 1.618;
return Math.pow(p, 2) * ((x + 1) * p - x);
},
Bounce: function(p){
var value;
for (var a = 0, b = 1; 1; a += b, b /= 2){
if (p >= (7 - 4 * a) / 11){
value = - Math.pow((11 - 6 * a - 11 * p) / 4, 2) + b * b;
break;
}
}
return value;
},
Elastic: function(p, x){
return Math.pow(2, 10 * --p) * Math.cos(20 * p * Math.PI * (x[0] || 1) / 3);
}
});
['Quad', 'Cubic', 'Quart', 'Quint'].each(function(transition, i){
Fx.Transitions[transition] = new Fx.Transition(function(p){
return Math.pow(p, [i + 2]);
});
});