====== About the script ======
  * Purpose : These scripts will give you a beautiful page transition animation and an optional horizontal page loop
  * Author : [[https://plus.google.com/+LukasMorawietz|LM13]]
  * Current Version : 2.1
  * Link: https://plus.google.com/115366157037831519359/posts/eUtogDspL2X
  * Download avialable! (Check repository)

====== Changelog ======
  * Version 1.0 (5/7/2014): initial release in wiki
  * Version 2.1 (12/7/2014): no second script needed anymore, added optional fade, improved speed for lot of pages & items 



====== How to use the script ======
  * Set the script to the positionchanged event of your container; configure the main script, if you want fading 
  * enable infinte scrolling if you want a page loop, disable it if you don't want to loop through pages
  * in this container: create a shortcut or a gesture to the script 
  * one click on the shortcut will enable the animation, clicking again will disable the animation. 
  * BE SURE TO DISABLE THE ANIMATION BEFORE YOU EDIT, MOVE OR ADD ITEMS!

//please report all bugs in the g+ community!//

====== Script ======
<sxh javascript;>//config 
var fade=false;
//endconfig


var e=LL.getEvent(); 
var d=e.getContainer();
var dwidth=d.getWidth(); 
var dheight=d.getHeight();
var cont=JSON.parse(d.getTag()|| "null");

if(e.getSource()!="C_POSITION_CHANGED"){
var items=d.getItems();
var box=d.getBoundingBox();
if(cont==null) cont=new Object(); cont.minx=box.getLeft(); cont.maxx=box.getRight();
var minpage=Math.floor(cont.minx/dwidth);
if(cont.setup!=true) 
{ 
cont.pages=[];
var counters=[];
for(x=0;x<Math.ceil(cont.maxx/dwidth)-minpage;x++)
{
cont.pages[x]=[];
counters[x]=0;
} 
for(x=0;x<items.length;x++) 
{ 
var i=items.getAt(x); 
var pinned=i.getProperties() .getString("i.pinMode");
if(pinned=="NONE"|| pinned=="Y")
{
var data=new Object(); data.posx=i.getPositionX(); data.posy=i.getPositionY();
data.rot=i.getRotation(); if(i.getProperties().getBoolean("i.onGrid")) data.onGrid=true; 
else data.onGrid=false; i.getProperties().edit().setBoolean("i.onGrid",false).commit();
var p=Math.floor(data.posx/dwidth)-minpage;
cont.pages[p][counters[p]++]=i.getId();
i.setTag(JSON.stringify(data)); 
}
} 
for(x=0;x<Math.ceil(cont.maxx/dwidth)-minpage;x++)
{
cont.pages[x].length=counters[x];
} 
cont.setup=true; Android.makeNewToast("Animation enabled",true).show();
} 
else
{ 
var cellw=d.getCellWidth(); 
var cellh=d.getCellHeight();
for(x=0;x<items.getLength();x++) 
{ 
var i=items.getAt(x); 
var data=JSON.parse(i.getTag());
if(data!=null)
{
i.setRotation(data.rot);
i.setPosition(data.posx,data.posy);
if(data.onGrid==true) 
{ 
iwidth=i.getWidth(); iheight=i.getHeight(); i.getProperties().edit().setBoolean("i.onGrid",true).commit(); 
i.setCell(Math.round(data.posx/cellw),Math.round(data.posy/cellh),Math.round((data.posx+iwidth)/cellw),Math.round(( data.posy+iheight)/cellh)); 
} 
} 
} 
cont.setup=false; Android.makeNewToast("Animation disabled",true).show(); 
} 
d.setTag(JSON.stringify(cont));
}


if(cont==null || !cont.setup || d.getPositionScale()!=1)return;
var dposx=d.getPositionX();
var dposy=d.getPositionY();
var current=Math.floor(dposx/dwidth);
var pagepos=current*dwidth;
var percent=(dposx-pagepos)/dwidth;
var maxpage=Math.ceil((cont.maxx-dwidth)/dwidth);
var minpage=Math.floor(cont.minx/dwidth);

if((percent>0.005 && percent<99.995) && dposx>cont.minx-dwidth)
{
var scrollLimit=d.getProperties() .getBoolean("noScrollLimit");
if(dposx>cont.maxx-dwidth&&scrollLimit){
d.setPosition(cont.minx-dwidth,dposy,1,false);
}
if(dposx<cont.minx&&scrollLimit)
cont.state=true;
var items=cont.pages[(cont.state?maxpage:current)-minpage];
if(items!=null)
{
for(z=0;z<items.length;z++)
{
var item=LL.getItemById(items[z]);
var data=JSON.parse(item.getTag());
item.setRotation(90*percent+data.rot);
var c0=center(item,data.rot);
var x=((data.posx+c0[0])%dwidth+ dwidth)%dwidth;
var y=((data.posy+c0[1])%dheight+ dheight)%dheight;
var sqrt=Math.sqrt(Math.pow(x,2) +Math.pow(y,2));
var angle=((x==0&&y==0)?0:Math.acos(x/sqrt))+percent*Math.PI/2;
var c=center(item,item.getRotation());
item.setPosition(dposx+Math.cos(angle)*sqrt-c[0],dposy+Math.sin(angle)*sqrt-c[1]);
if(fade)
item.getProperties().edit().setInteger("i.alpha",255*(1-percent)).commit();
}
}
var items=cont.pages[current+1-minpage];
if(items!=null)
{
for(z=0;z<items.length;z++)
{
var item=LL.getItemById(items[z]);
var data=JSON.parse(item.getTag());
item.setRotation(90*percent-90+data.rot);
var c0=center(item,data.rot);
var x=((data.posx+c0[0])%dwidth+ dwidth)%dwidth;
var y=((data.posy+c0[1])%dheight+ dheight)%dheight;
var sqrt=Math.sqrt(Math.pow(x,2) +Math.pow(y,2));
iwidth=item.getWidth()*item.getScaleX();
var angle=((x==0&&y==0)?0:Math.acos(x/sqrt))+(percent-1)*Math.PI/2;
var c=center(item,item.getRotation());
item.setPosition(dposx+Math.cos(angle)*sqrt-c[0],dposy+Math.sin(angle)*sqrt-c[1]);
if(fade)item.getProperties().edit().setInteger("i.alpha",255*(percent)).commit();
}
}
}
else
{
d.setPosition(dposx,dposy);
d.setPosition(dposx<cont.minx?cont.maxx-dwidth:dposx,dposy,1,false);
cont.state=false;
var items=d.getItems();
for(i=0;i<items.length;i++)
{
item=items.getAt(i);
var data=JSON.parse(item.getTag());
if(data!=null)
{
item.setRotation(data.rot);
item.setPosition(data.posx,data.posy);
}
if(fade)item.getProperties().edit().setInteger("i.alpha",255).commit();
}
}

//r in degree
function center(item,r)
{
r=r*Math.PI/180;
var sin=Math.abs(Math.sin(r));
var cos=Math.abs(Math.cos(r));
var w=item.getWidth()*item.getScaleX();
var h=item.getHeight()*item.getScaleY();
return [(w*cos+h*sin)*0.5,(h*cos+w*sin)*0.5];
}
</sxh>