Lightning Launcher

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====== About the script ======
  * Purpose : This script will bounce all items randomly around,they will bounce off the screen borders and each other.
  * Author : [[https://plus.google.com/+LukasMorawietz|LM13]]
  * Concept : This script is based on the [[script_llxperiment_boing|boing script]] by TrianguloY
  * Current Version : 1.1
  * Link : https://plus.google.com/105066926163073195690/posts/BMYiNUEss8B (scroll down in the comments) 
  * Video : https://plus.google.com/115366157037831519359/posts/SXcGo6A2gDo

====== Changelog ====== 
  * Version 1.0 (3/5/2014): initial release in wiki
  * Version 1.1 (18/5/2014): reduced jumps

====== How to use the script ======
  * detach all items in a container
  * set up configuration
  * run the script in the container

====== Issues and hints ======
  * unexpected effects may occur if the items overlap when you start the script
  * sometimes an item jumps. This happens because the item has no space where it should move to.
  * If you have set velocity to 1 or bigger, you can cancel the script by opening any app
  * You'll need a high end phone to run this smoothly with a lot of items. It should work on average phones for up to 5 items.

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

====== Script code ======
<code>
var bounciness = 1;//Reduction every tick, between 0 (only one tick) and 1 (always bouncing) [Recommended 0.95]
var inVel = 0.02 //initial velocity. set it to 0 for random one [recommended 0.5]

var frecuency = 1000;//ticks per second [Recommended 60]



var event = LL.getEvent();
var cont = event.getContainer();
var items;
items=cont.getItems();
for(var i=items.getLength()-1; i>=0;--i){
var item=items.getAt(i);
if(item.getType()=="StopPoint")continue;
var ang = Math.random()*2*Math.PI;
var invel=inVel;	if(invel<=0)invel=Math.random();
invel*=(cont.getHeight()+cont.getWidth())/2;
//saving item specific data in the tag
var data=new Object();
data.vel = [ Math.cos(ang)*invel , Math.sin(ang)*invel ];

data.size = [ item.getWidth()*item.getScaleX() , item.getHeight()*item.getScaleY() ];
item.setTag(JSON.stringify(data));
}
tick();

function tick(){
var changed=false;//value if something changed
for(var a=items.getLength()-1; a>=0;--a){
var i=items.getAt(a); if(i.getType()=="StopPoint")continue;
var data=JSON.parse(i.getTag());
//continue statement
if((Math.abs(data.vel[0])<0.2 && Math.abs( data.vel[1])<0.2)||LL.isPaused()) continue;
var changed=true;

//Reduction
 data.vel=[ data.vel[0]*bounciness , data.vel[1]*bounciness ];

var newpos = [ i.getPositionX()+ data.vel[0] , i.getPositionY()+ data.vel[1] ];

//checking all other items after the current for overlap
for(var b=a-1; b>=0;--b){
var i2=items.getAt(b); if(i2.getType()=="StopPoint")continue;
var data2=JSON.parse(i2.getTag());
var newpos2 = [ i2.getPositionX()+ data2.vel[0] , i2.getPositionY()+ data2.vel[1] ];
var p;//new position of the item with the smaller width/height
var p2;//higher width/height
var s;//size of the item with the smaller width/height
var s2; //higher width/height
//horizonatal:
if(data.size[0]<data2.size[0])
{
	//the first item is smaller
p=newpos[0]
p2=newpos2[0];
s=data.size[0];
s2= data2.size[0];
}
else
{
	//the second item is smaller
p=newpos2[0]
p2=newpos[0];
s=data2.size[0];
s2= data.size[0];
}
var overx= ((p2<p&&p<p2+s2)||(p2<p+s&&p+s<p2+s2));//check if horizontal coordinates match
//the same again, but for vertical
if(data.size[1]<data2.size[1])
{
p=newpos[1];
p2=newpos2[1];
s=data.size[1];
s2= data2.size[1];
}
else
{
p=newpos2[1];
p2=newpos[1];
s=data2.size[1];
s2= data.size[1];
}
var overy= ((p2<p&&p<p2+s2)||(p2<p+s&&p+s<p2+s2));
if(overx && overy){
	//the distances on the sides of the first items, how far it overlaps
distl=newpos2[0]+data2.size[0]-newpos[0];
distr=newpos[0]+data.size[0]-newpos2[0];
distt=newpos2[1]+data2.size[1]-newpos[1];
distb=newpos[1]+data.size[1]-newpos2[1];
if(distr<distb && distr<distt && distr<distl)//overlapping right
{
newpos[0]-=2*distr;
data.vel[0]=-data.vel[0];
data2.vel[0]=-data.vel[0];
}
else if(distb<distt && distb<distl)//overlapping bottom
{
newpos[1]-=2*distb;
data.vel[1]=-data.vel[1];
data2.vel[1]=-data.vel[1];
}
else if(distt<distl)//overlapping top
{
newpos[1]+=2*distt;
data.vel[1]=-data.vel[1];
data2.vel[1]=-data.vel[1];
}
else //overlapping left
{
newpos[0]+=2*distl;
data.vel[0]=-data.vel[0];
data2.vel[0]=-data.vel[0];
}
}
i2.setTag(JSON.stringify(data2));
}


var t;
//right
t=(newpos[0]+ data.size[0])-( cont.getPositionX()+cont.getWidth()/cont.getPositionScale() ) ;
if(t>0){newpos[0]-=2*t; data.vel[0]=-data.vel[0];}

//bottom
t=(newpos[1]+ data.size[1])-( cont.getPositionY()+cont.getHeight()/cont.getPositionScale() ) ;
if(t>0){newpos[1]-=2*t; data.vel[1]=-data.vel[1];}

//left
t= newpos[0]- cont.getPositionX();
if(t<0){newpos[0]-=2*t; data.vel[0]=-data.vel[0];}

//top
t= newpos[1]- cont.getPositionY();
if(t<0){newpos[1]-=2*t; data.vel[1]=-data.vel[1];}

//set
i.setPosition(newpos[0] , newpos[1] );
i.setTag(JSON.stringify(data));
}
if(!changed)return;
//repeat
setTimeout(tick,1000/frecuency);
}
</code>
Lightning Launcher

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