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(function(){
// Toutes mes fonctions
var myFonctions = {
// Ajout d'écouteur
add_event : function(evenement, element, fonction){
if(element.addEventListener){
element.addEventListener(evenement, fonction, false);
}
else{
element.attachEvent('on'+evenement, fonction);
}
},
// Selection d'un élément par l'id
id : function(elem){
return document.getElementById(elem);
},
// Transfert obj source, obj des
transfer : function(source, dest){
var prop, transfered={};
for ( prop in dest ) { transfered[prop] = dest[prop]; }
for ( prop in source ) { transfered[prop] = source[prop]; }
return transfered;
},
// Taille de la page
pageDim : function(elem){
if(elem){
var d = dE = dB = elem,
w, h;
}
else{
var d = document,
dE = d.documentElement,
dB = d.body,
w, h;
}
h = dE.scrollHeight;
w = dE.scrollWidth;
if ( dE.clientHeight > h ) { h = dE.clientHeight; }
if ( dE.clientWidth > w ) { w = dE.clientWidth; }
if ( dB.scrollHeight > h ) { h = dB.scrollHeight; }
if ( dB.scrollWidth > w ) { w = dB.scrollWidth; }
return {'w':w, 'h':h} ;
},
// Taille de la fenetre
winDim : function(){
var W,H,
i = window,
d = document,
de = d.documentElement,
db = d.body;
if ( i.innerWidth ) {
W = i.innerWidth;
H = i.innerHeight;
} else if ( de.clientWidth ) {
W = de.clientWidth;
H = de.clientHeight;
}
else {
W = db.clientWidth;
H = db.clientHeight;
}
return {w:W, h:H} ;
},
// Position h et v du defilement
scrolled : function(){
var x,y,
w = window,
d = document,
de = d.documentElement,
db = d.body;
if ( w.pageXOffset!==undefined) {
x = w.pageXOffset;
y = w.pageYOffset;
}
else {
x = de.scrollLeft ? de.scrollLeft : (db.scrollLeft?db.scrollLeft:0) ;
y = de.scrollTop ? de.scrollTop : (db.scrollTop?db.scrollTop:0) ;
}
return {'x':x, 'y':y};
},
// position de elem
getPos : function(elem,choix){
var pos={'r':0,'l':0,'t':0,'b':0},
tmp=elem, choix = choix || null;
do {
pos.l += tmp.offsetLeft;
tmp = tmp.offsetParent;
} while( tmp !== choix );
pos.r = pos.l + elem.offsetWidth;
tmp=elem;
do {
pos.t += tmp.offsetTop;
tmp = tmp.offsetParent;
} while( tmp !== choix );
pos.b = pos.t + elem.offsetHeight;
return pos;
},
//Calcul de la durre
duree : function(y,x,tp){
y = Math.sqrt( Math.pow( y, 2 ) + Math.pow( x, 2 ) );
var tmp = 0, i = 0 ;
while ( tmp < y ) {
i++ ;
tmp = tmp + i*i ;
}
return i * tp ;
},
// Annule l'action par default
preventDefault : function(e){
e = e||event;
if (e.preventDefault) { e.preventDefault(); }
else { e.returnValue = false; }
},
//Effets easing => Le premier marche, les autres que du haut vers le vas
// actualStep: current time, startValue: beginning value, endValue: change in value, totalSteps: duration
easeInOut : function( startValue, endValue, totalSteps, actualStep, powr, round ){
var stepp, delta = endValue - startValue;
stepp = startValue+(Math.pow(((1 / totalSteps) * actualStep), powr) * delta);
return round ? Math.round(stepp) : stepp;
},
easeInOutQuad : function(startValue, endValue, totalSteps, actualStep, powr){
if ((actualStep/=totalSteps/2) < 1) return endValue/2*actualStep*actualStep + startValue;
return -endValue/2 * ((--actualStep)*(actualStep-2) - 1) + startValue;
},
easeInOutElastic: function (startValue, endValue, totalSteps, actualStep) {
var s = 1.70158, p = 0, a = endValue;
//alert(startValue+' '+endValue+' '+totalSteps+' '+actualStep);
if (actualStep === 0) {
return startValue;
}
if ((actualStep /= totalSteps / 2) === 2) {
return startValue + endValue;
}
if (!p) {
p = totalSteps * (0.3 * 1.5);
}
if (a < Math.abs(endValue)) {
a = endValue;
s = p / 4;
} else {
s = p / (2 * Math.PI) * Math.asin(endValue / a);
}
if (actualStep < 1) {
return -0.5 * (a * Math.pow(2, 10 * (actualStep -= 1)) * Math.sin((actualStep * totalSteps - s) * (2 * Math.PI) / p)) + startValue;
}
return a * Math.pow(2, -10 * (actualStep -= 1)) * Math.sin((actualStep * totalSteps - s) * (2 * Math.PI) / p) * 0.5 + endValue + startValue;
},
easeInElastic: function (startValue, endValue, totalSteps, actualStep) {
var s = 1.70158, p = 0, a = endValue;
if (actualStep === 0) {
return startValue;
}
if ((actualStep /= totalSteps) === 1) {
return startValue + endValue;
}
if (!p) {
p = totalSteps * 0.3;
}
if (a < Math.abs(endValue)) {
a = endValue;
s = p / 4;
} else {
s = p / (2 * Math.PI) * Math.asin(endValue / a);
}
return -(a * Math.pow(2, 10 * (actualStep -= 1)) * Math.sin((actualStep * totalSteps - s) * (2 * Math.PI) / p)) + startValue;
}
}
var scroll = function(options){
this.options = {
ease : 0.3,
effet: 'easeInOut',
duree : 50,
move : 'window', //Par default
finish : false
};
this.options = myFonctions.transfer(options,this.options);
this.init = function(elem){
this.startTime = new Date().getTime();
var t_page = myFonctions.pageDim(),
t_win = myFonctions.winDim(),
element = myFonctions.getPos(elem),
init_pos = myFonctions.scrolled(),
self = this;
// En cas de destination trop proche du bord
if(element.l + t_win.w > t_page.w){
element.l = t_page.w - t_win.w;
}
if(element.t + t_win.h > t_page.h){
element.t = t_page.h - t_win.h;
}
//Calcul de la duree
var duree = myFonctions.duree(init_pos.y - element.t, init_pos.x - element.l,this.options.duree);
this.next(t_page,t_win,element,init_pos,self,duree);
};
this.next = function(t_page,t_win,element,init_pos,self,duree){
var timer = setTimeout(function(){
self.frame(t_page,t_win,element,init_pos,self,duree);
},25);
}
this.frame = function(t_page,t_win,element,init_pos,self,duree){
var time = new Date().getTime(),
actuel_t = time - this.startTime,
calculTime = Math.min(actuel_t,duree),
options = this.options,
newX = myFonctions[options.effet](init_pos.x, element.l,duree,calculTime,options.ease);
newY = myFonctions[options.effet](init_pos.y, element.t,duree,calculTime,options.ease);
window.scrollTo(newX,newY);
if(actuel_t >= duree){
window.scrollTo(element.l,element.t);
if(options.finish){options.finish();}
}
else{
this.next(t_page,t_win,element,init_pos,self,duree);
}
}
}; |
