Lightning Launcher

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====== About the script ======
  * Purpose : It saves the position, size, scale and rotation of the items in free mode, and restore them when launched moving them smoothly (more or less).
  * Author : [[https://plus.google.com/u/1/105066926163073195690|TrianguloY]]
  * Link: (with video) https://plus.google.com/u/1/105066926163073195690/posts/DMDboQ4cCjF

====== How to use the script ======

Instructions:
  * The script will save the data of the items in the tag of the item/container.
  * How to move the items: just launch the script from the item with the data (click, swipe...) or even from a container (tap, long tap...)
  * How to save the data: Launch the script from the scripts menu (LL pop-up --> scripts) and choose the velocity (the first time you can simply just executing normally).

Characteristics:
  * If the item have a different tag it will ask before save.
  * Items in grid mode won't be saved, and also won't be moved even if they were saved while in free mode.
  * Rotation works from the center of the item (something obvious, but not script-side)
  * Debug mode to see if an item is stuck in the animation.
  * When the launcher lost focus, items are automatically moved to the final position and the script finishes.
  * If you start a different instance of the script while another one is running, the previous one stops automatically.

Problems:
  * Items with skew can behave wrong.

====== Script code ======
<code javascript;>
var defvelocity = 0.2;//The default velocity. The bigger, the faster (between (0,1] warning: outside that range it can crash)
var frecuency = 60;//ticks per second [Recommended 60] (set to 0 for fastest possible, in case you have a lot of items)

/*
Script made by TrianguloY you can contact me in Google+

This script will move the items in free mode to the position they had when saved.
To save the position just place the items where you want in free mode and run this script from the scripts menu.
The data is saved in the tag of the item/container.


modified: no, original script
(change this if you want to modify something and publish it)
*/



var debug = false;


//vars
var event = LL.getEvent();
var cont = event.getContainer();
var item = event.getItem();
var tagged=item||cont;
var source=event.getSource();

var tag = tagged.getTag();
var data=JSON.parse(tag);

//save mode
if(source=="MENU_ITEM" || source=="MENU_APP" || tag==undefined || data[0]==undefined || data[0][0]!='save layout'){ 
	save();
	return;
}

//token to stop if another instance is running
var sessiontoken;
do{ 
	sessiontoken=""+Math.random();
}while(sessiontoken==LL.getScriptTag());
LL.setScriptTag(sessiontoken);

var velocity = data[0][1]||defvelocity;

//execute in each item
for(var i=data.length-1;i>0;--i){
	var item= LL.getItemById(data[i][0]);
	//move the item to their position if in free mode
 	if(item!=null && item.getCell()==null) {
		if(debug)item.setLabel("@"+item.getLabel());
		move(item, data[i]);
	}
}
return;



//save function
function save(){
	//initial checks
	var vel=defvelocity;
	if(data!=null && data[0]!=null && data[0][0]!='save layout') { 
		alert("Diferent tag found:\n"+data);
	}else{
		if(data!=null && data[0]!=null)vel=data[0][1];
	}
	var vel=prompt("Save?\n Velocity: the bigger the faster\nbetween (0,1]",vel);
	if(vel==null)return;
	
vel=vel>1?1:vel<=0?defvelocity:vel;

	//data storing procces
	data=[];
	data[0]=["save layout",vel];
	var i = 1;
	var items = cont.getItems();
	for(var j=items.getLength()-1;j>=0;--j){
		//save the data of each item
		var t = items.getAt(j);

		//avoid grid items
		if(t.getCell()!=null)continue;

		data[i]=[];//data of the item (in rows to see where each one is stored)
		data[i][1]=t.getPositionX();
		data[i][2]=t.getPositionY();
		data[i][3]=t.getScaleX();
		data[i][4]=t.getScaleY();
		data[i][5]=t.getWidth();
		data[i][6]=t.getHeight();
		data[i][7]=t.getRotation();

		//convert to the center of the item
		var c=center(data[i]);
		data[i][1]+=c[0];
		data[i][2]+=c[1];

		data[i][0]=t.getId();
		++i;
	};

	//final save
	tagged.setTag(JSON.stringify(data));
	Android.makeNewToast("Saved "+(i-1)+" item's data in "+tagged,true).show();

}



//custom lerp. It moves the item a bit and repeat, stops when finish, when LL is not active or when another instance of the script runs
function move(item,dat){
	
	//another script is running
	if( sessiontoken!=LL.getScriptTag()){return;}
	
	//actual data
	var now = [
	0,
	item.getPositionX(),
	item.getPositionY(),
	item.getScaleX(),
	item.getScaleY(),
	item.getWidth(),
	item.getHeight(),
	item.getRotation()
	];
	var n=center(now);
	now[1]+=n[0];
	now[2]+=n[1];

	//calculate the next step
	var cut=[0,0.5,0.5,0.01,0.01,1,1,0.99];
	var step = [];
	var flag = "";
	
	for(var j=dat.length-1;j>0;--j){
		step[j]=dat[j]-now[j];
		if(Math.abs(step[j])>cut[j]){
			flag+=j;
			if (cut[j]==1){
				step[j]=now[j]+(step[j]>0?Math.max(step[j]*velocity,cut[j]):Math.min(step[j]*velocity,-cut[j]));
			}else step[j]=now[j]+step[j]*velocity;
		}else step[j]=dat[j];
	}
	
	//if nothing changed or LL paused
	if( flag=="" || LL.isPaused()){	
		item.setScale(dat[3],dat[4]);
		item.setSize(dat[5],dat[6]);
		item.setRotation(dat[7]);

		var d = center(dat);
		item.setPosition(dat[1]-d[0],dat[2]-d[1]);
		if(debug)item.setLabel(item.getLabel());
		return;
	}

	if(debug)item.setLabel(flag+"@"+item.getLabel());
	//sets the next step and repeat
	item.setSize(step[5],step[6]); 
	item.setScale(step[3],step[4]);
	item.setRotation(step[7]);

	var s=center(step);
	item.setPosition(step[1]-s[0],step[2]-s[1]);

velocity=(1+999*velocity)/1000;


	setTimeout(function(){ move(item,dat);},frecuency==0?0:1000/frecuency);

}



//custom function to get the center of the item d=[,,,sizx,sizy,scax,scay,rot]
function center(d){
	var c=[];
	var r=d[7]*Math.PI/180;	c[0]=Math.abs(d[4]*d[6]*Math.sin(r))/2+Math.abs(d[3]*d[5]*Math.cos(r))/2;
	c[1]=Math.abs(d[3]*d[5]*Math.sin(r))/2+Math.abs(d[4]*d[6]*Math.cos(r))/2;
	return c;
}
</code>
Lightning Launcher

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