====== About the script ======
  * Purpose : This script is will use an item as gesture detection area, so you can launch any shortcut by a gesture! 
  * Author : [[https://plus.google.com/+LukasMorawietz|LM13]]
  * Current Version : 1.1
  * Link (with video): https://plus.google.com/115366157037831519359/posts/ZzXD1hKNrf2

====== Changelog ====== 
  * Version 1.0 (31/8/2014): initial release in wiki
  * Version 1.1 (2/9/2014): More stable loading, First gesture Bug fix (hopefully)

====== How to use the script ======
  * create a shortcut and hide it's label and icon
  * Resize it to the wished drawport size
  * set this script to the Touchevent
  * enable it in item menu
  * Change the configuration to your data, especially the itemID
  * to add or change a gesture: launch this script on the shortcut you want to assign a gesture to, then draw the new gesture.
  * to remove a gesture: delete the shortcut to which the gesture was assigned 


====== Issues and hints ======
  * With too much gestures it may stop working
  * the first gesture after LL started may be not fully drawn or not detected.
  * if more than one gesture is matching, one is selected by database, so avoid similar gestures
  * straight horizontal or vertical lines may not work as gesture. 
//please report all bugs in the g+ community//

====== Script ======
<sxh javascript;>//config
var tolerance=7;
var itemID=0x060029;
var bgColor=0x10ffffff;
var gestureColor=0xffffffff;
//endconfig

if(typeof add==='undefined')add=null;
try{
	switch(event.getAction())
		{
		case MotionEvent.ACTION_DOWN:
			paint=new Paint(Paint.ANTI_ALIAS_FLAG);
			paint.setColor(gestureColor);
			paint.setStrokeWidth(5);
			paint.setStrokeJoin(Paint.Join.ROUND);
			image=item.getBoxBackground("n");
			if(image.getWidth()!=item.getWidth()||image.getHeight()!=item.getHeight())image=LL.createImage(item.getWidth(),item.getHeight());
			canvas=image.draw();
			image.getBitmap().eraseColor(Color.TRANSPARENT);
			canvas.drawColor(bgColor);
			this.gesture=[];
			this.gesture.push([event.getX(),event.getY()]);
			image.update();
			item.setBoxBackground(image,"n");
			done=false;
			setTimeout(loadGestures,0);
			break;
		case MotionEvent.ACTION_MOVE:
			this.gesture.push([event.getX(),event.getY()]);
			canvas.drawLine(this.gesture[this.gesture.length-2][0],this.gesture[this.gesture.length-2][1],event.getX(),event.getY(),paint);
			image.update();item.setBoxBackground(image,"n");
			break;
		case MotionEvent.ACTION_UP:
			this.gesture.push([event.getX(),event.getY()]);
			canvas.drawLine(this.gesture[this.gesture.length-2][0],this.gesture[this.gesture.length-2][1],event.getX(),event.getY(),paint);
			while(!done);
			if(add!=null)
			{
				gestures.push([scaleGesture(this.gesture),add]);
				item.setTag(JSON.stringify(gestures));
				add=null;
				Android.makeNewToast("Saved!",true).show();
			}
			else
			{
				var sg=scaleGesture(this.gesture);
				schleife:for(var x=0;x<gestures.length;x++)
				{
					var sp=gestures[x][0];
					var gesDiff=0;
					for(var i=0;i<sg.length;i++)
					{
						var p0=sg[i];
						var diff=200;
						for(var a=Math.round((i/sg.length)*sp.length)-Math.round(sp.length/4)<0?0:Math.round((i/sg.length)*sp.length)-Math.round(sp.length/4);a<=Math.round((i/sg.length)*sp.length)+Math.round(sp.length/4)&&a<sp.length;a++)
						{
							var p1=sp[a];
							var newDiff=Math.sqrt(Math.pow(p0[0]-p1[0],2)+Math.pow(p0[1]-p1[1],2));
							if(newDiff<diff)
							{
								diff=newDiff;
							}
						}
						if(diff>tolerance*4)
						{
							continue schleife;
						}
						gesDiff=gesDiff+diff;
					}
					if(gesDiff/sg.length<tolerance)
					{
						break;
					}
				}
				if(x==gestures.length)Android.makeNewToast("No gesture detected",true).show();
				else LL.startActivity(LL.getItemById(gestures[x][1]).getIntent());
			}
			image.getBitmap().eraseColor(Color.TRANSPARENT);
			canvas.drawColor(bgColor);
			image.save();
			item.setBoxBackground(image,"n");
			break;
	}
}
catch(NullPointerException)
{
	item=LL.getItemById(itemID);gestures=JSON.parse(item.getTag())||[];
	for(var a=0;a<gestures.length;a++)
	{
		if(LL.getItemById(gestures[a][1])==null)gestures.splice(a,1);
	}
	event=LL.getEvent();
	if(event.getItem().getType()!="Shortcut"&&event.getItem().getType()!="Folder")
	{
		Android.makeNewToast("Error: Item has no Intent",true).show();
		return;
	}
	for(var a=0;a<gestures.length;a++)
	{
		if(gestures[a][1]==event.getItem().getId())
		{
			paint=new Paint(Paint.ANTI_ALIAS_FLAG);
			paint.setColor(gestureColor);
			paint.setStrokeWidth(5);
			paint.setStrokeJoin(Paint.Join.ROUND);
			image=item.getBoxBackground("n");
			if(image.getWidth()!=item.getWidth()||image.getHeight()!=item.getHeight())image=LL.createImage(item.getWidth(),item.getHeight());
			canvas=image.draw();
			image.getBitmap().eraseColor(Color.TRANSPARENT);
			canvas.drawColor(bgColor);
			paint.setColor(gestureColor);
			for(var z=1;z<gestures[a][0].length;z++)
			{
				canvas.drawLine(gestures[a][0][z-1][0]/100*item.getWidth(),gestures[a][0][z-1][1]/100*item.getHeight(),gestures[a][0][z][0]/100*item.getWidth(),gestures[a][0][z][1]/100*item.getHeight(),paint);
			}
			image.update();
			item.setBoxBackground(image,"n");
			if(!confirm("This shortcut has already a gesture. It is now displayed until something is drawn. Do you want to replace it?"))return;
			gestures.splice(a,1);
			break;
		}
	}
	item.setTag(JSON.stringify(gestures));
	Android.makeNewToast("The next drawn Gesture will be set to this shortcut",true).show();
	add=event.getItem().getId();
}

function scaleGesture(GESTURE)
{
	var maxx=0,minx=item.getWidth(),maxy=0,miny=item.getHeight();
	for(var i=0;i<GESTURE.length;i++)
	{
		if(GESTURE[i][0]<minx)minx=GESTURE[i][0];
		if(GESTURE[i][0]>maxx)maxx=GESTURE[i][0];
		if(GESTURE[i][1]<miny)miny=GESTURE[i][1];
		if(GESTURE[i][1]>maxy)maxy=GESTURE[i][1];
	}
	var scaled=[];
	for(var i=0;i<GESTURE.length;i++)
	{
		scaled.push([(GESTURE[i][0]-minx)/(maxx-minx)*100,(GESTURE[i][1]-miny)/(maxy-miny)*100]);
	}
	return scaled;
}


function loadGestures()
{
	if(typeof gestures==='undefined')gestures=JSON.parse(item.getTag())||[];
	for(var a=0;a<gestures.length;a++)
	{
		if(LL.getItemById(gestures[a][1])==null)gestures.splice(a,1);
	}
	item.setTag(JSON.stringify(gestures));
	done=true;
}
</sxh>