GestureEventsEasy Question

Ninjadoodle · February 2016

Hi guys

I'm trying to figure out how to use @ar2rsawseen 's GestureEventsEasy class, but can't seem to find any samples.

Would anybody be able to show me, how to for example make a 'swipe right' on a sprite, using this class?

Thank you heaps in advance!

ar2rsawseen · February 2016

you just listen on the event and thats it

Available events are:

Event.SINGLE_TAP
Event.DOUBLE_TAP
Event.TRIPLE_TAP
Event.LONG_TAP
Event.SWIPE_DOWN
Event.SWIPE_UP
Event.SWIPE_LEFT
Event.SWIPE_RIGHT
Event.DRAG_START
Event.DRAG_MOVE
Event.DRAG_END

to enable dragging you need to call sprite:setDragging(true)

Ninjadoodle · February 2016

Hi @ar2rsawseen

Thank you for the reply

I've tried doing, that but nothing happens. Here is a sample of my code ...

function test()
	print("right")
end
 
self.dial1:addEventListener(Event.SWIPE_RIGHT, test, self.dial1)

As far as I can see it should work.

Thanks again!

Ninjadoodle · February 2016

I tried playing with the code again, and it seems to work when I add the listener to the stage. However, if I try to add it to a graphic or movie-clip, strange stuff happens ...

When added to a movie clip I seem to get a swipe response when the swipe is started outside of the movie clip, and is released over the movie clip.

Is the class only mean to be used with the stage itself?

Thank you in advance!

ar2rsawseen · February 2016

I see, yes it generally listens to events on stage, so if your sprite is blocking input, it could happen. Usually as far as I remember, they did not block the input.

Ninjadoodle · February 2016

Hi @ar2rsawseen

Thanks for the reply!

I worked out a way of doing it, by using a mouseDown event as well as the swipe event.

This way I add the swipe listener to the stage and check whether a sprite has been touched.

It's working well

Thank you!

Apollo14 · February 2018

Hi guys!
How to detect swipe left/right? Something is wrong in my test code:
I've added "GestureEventEasy.lua" to my project.
In my "main.lua I've added:

function onSwipeRightFunc()
	print("swiped right!")
end
stage:addEventListener(Event.SWIPE_RIGHT, onSwipeRightFunc)

It doesn't work as it is

This code also doesn't work:

function onSwipeRightFunc()
	print("swiped right!")
end
stage:addEventListener("swipeRight", onSwipeRightFunc)

I'm using it together with SceneManager, to change scenes with swipe.

Apollo14 · February 2018

This old stuff also doesn't work:

function onSwipeRightFunc()
	print("swiped right!")
end
 
function onSwipeLeftFunc()
	print("swiped left!")
end
 
function onScroll()
	print("scrolled!")
end
--Detecting swipe via Detector:
detector = SwypeDetector.new(stage, onSwipeLeftFunc, onSwipeRightFunc, onScroll)

Apollo14 · February 2018

Guys, so how to detect them freaking swipes?

Apollo14 · February 2018

aha! that stuff seems to be working

So problem is 99% solved

Guys, what methods/libs do you usually use to detect swipes?

Apollo14 · February 2018

not solved

Guys, why swipes are detected only in the initial scene of SceneManager?
When app starts, on first swipe scene changes to next/current.
But after scene changed, swipe detection does not work (app is working no errors shown, but swipe detection just doesn't work)

First I've added class 'Mells_Gestures.lua'
Then I've added this code to my 'main.lua':

local sceneManager = SceneManager.new({
 	["menu"] = menu,
	["day1"] = day1,
	["day2"] = day2,
	["day3"] = day3,
	["day4"] = day4,
	["day5"] = day5,
	["day6"] = day6,
	["day7"] = day7
})
stage:addChild(sceneManager)
currentScene = os.date("*t").wday --get current day number
sceneManager:changeScene("day"..currentScene) --show today's relevant scene on app start
 
function gotoNextScene()
	local nextScene=(currentScene%7)+1
	sceneManager:changeScene("day"..nextScene, 1, SceneManager.moveFromRight, easing.outBack)
	currentScene = nextScene
end
 
function gotoPrevScene()
	if currentScene ==1 then currentScene = 7
	else currentScene -=1 end
	sceneManager:changeScene("day"..currentScene, 1, SceneManager.moveFromLeft, easing.outBack)
end
 
--MELL's Gestures:
options = {minDistance = 100, maxDuration = 1.2}
gestures = Gestures.new(stage, options)
 
gestures:addCallback("onSwipeLeft", function(swipe, event, options)
	print ("swiped left!")
	gotoNextScene()
end)
 
gestures:addCallback("onSwipeRight", function(swipe, event, options)
	print ("swiped right!")
	gotoPrevScene()
end)

antix · February 2018

When each scene is transitioned in.. have you called the sprite:setDragging(true) function as mentioned by @ar2rsawseen?

Apollo14 · February 2018

antix said:
When each scene is transitioned in.. have you called the sprite:setDragging(true) function as mentioned by @ar2rsawseen?

I've tried all variants but 'Gestures.lua'

Now my swipe detection actually works

Thx @antix !

Inside that old topic there was like 3-4 different varians or so

SinisterSoft · February 2018

Gestures.lua ?

Apollo14 · February 2018

Yes I mean this variant: http://giderosmobile.com/forum/discussion/comment/13108/#Comment_13108

SinisterSoft · February 2018

I have written a gesture stacking system - no events - you check the stack for gestures and use them in turn. Good for games because the player can plan ahead as the game just goes through the list.

-- settings
local tapTime=0.3
local tapLongTime=0.3
local tapDisperse=7
local swipeDistance=15
local swipeDisperse=50
local tapPriority=true -- true if taps take priority over swipes
 
local insert,remove=table.insert,table.remove
local gestureStack={}
local gestureNames={"swipeRight","swipeLeft","swipeDown","swipeUp","tap","longTap"}
 
local touches={}
stage:addEventListener(Event.TOUCHES_BEGIN, function(e)
	local t=e.touch
	if not touches[t.id] then		
		local touch={}
		touch.x=t.rx
		touch.y=t.ry
		touch.time=os.timer()
		touches[t.id]=touch
	end
end)
 
stage:addEventListener(Event.TOUCHES_MOVE,function(e)
 
end)
 
stage:addEventListener(Event.TOUCHES_END,function(e)
	local t=e.touch
	local touch=touches[t.id]
	if touch then --if touch is defined
		local x,y=t.rx,t.ry
		local dx=t.rx-touch.x -- get swipe distance
		local dy=t.ry-touch.y
		local adx=-dx<>dx -- get abs swipe distance
		local ady=-dy<>dy
		if adx<=tapDisperse and
			ady<=tapDisperse then
			--can be a tap
			if os.timer()-touch.time>=tapLongTime then
				if tapPriority then
					insert(gestureStack,1,{6,x,y}) -- long tap
				else
					gestureStack[#gestureStack+1]={6,x,y} -- long tap
				end
			else
				if tapPriority then
					insert(gestureStack,1,{5,x,y}) -- tap
				else
					gestureStack[#gestureStack+1]={5,x,y} -- tap
				end
			end
		else
			--can be a swipe
 
			if adx<=swipeDisperse and ady>swipeDistance then -- vertical
				if dy<0 then -- up
					gestureStack[#gestureStack+1]={4,dy}
				else -- down
					gestureStack[#gestureStack+1]={3,dy}
				end
			elseif adx>swipeDistance and
				ady<=swipeDisperse then -- horizontal
				if dx<0 then -- left
					gestureStack[#gestureStack+1]={2,dx}
				else -- right
					gestureStack[#gestureStack+1]={1,dx}
				end
			end
		end
		touches[t.id]=nil
	end
end)
 
function getGesture()
	if #gestureStack>0 then
		local id=gestureStack[1]
		return id,gestureNames[id[1]]
	end
end
 
function removeGesture()
	if #gestureStack>0 then
		remove(gestureStack,1)
		return getGesture()
	end
end
 
function emptyGestures()
	gestureStack={}
end

In your game loop have something like this to read the gestures:

		local gesture,gestureName=getGesture()
		if gesture then
			print(gesture[1],gestureName)
			removeGesture()
		end

SinisterSoft · February 2018

I just updated the routine to also return the distance swiped.

pie · February 2018

@SinisterSoft cool thanks,
@hgy29 please notice that "special chars" < > are being translated by the forum to html > < (see snippet post above) it's not the first time that it happens, is it some setting in the updated forum? Thanks

SinisterSoft · February 2018

Yes, the <> should actually be <> and not & lt;& gt; That bit will find the abs.

SinisterSoft · February 2018

It forgot to mention it's also fully multi-touch - so you can tap 3 fingers to get 3 taps added, swipe and tap at the same time, etc...

SinisterSoft · February 2018

Made it so it's now multiplayer - if set to two players then left and right hand sides of the screen are player 1 and player 2 touch events.

-- settings
-- settings
local tapTime=0.3
local tapLongTime=0.3
local tapDisperse=7
local swipeDistance=15
local swipeDisperse=50
local tapPriority=false
local players=1
local width2=application:getLogicalHeight()/2
 
local insert,remove=table.insert,table.remove
local gestureStack={{},{}}
local gestureNames={"swipeRight","swipeLeft","swipeDown","swipeUp","tap","longTap"}
 
local touches={}
stage:addEventListener(Event.TOUCHES_BEGIN, function(e)
	local t=e.touch
	if not touches[t.id] then		
		local touch={}
		local x=t.rx
		if players==1 or x< width2 then
			touch.player=1
		else
			touch.player=2
		end
		touch.x=x
		touch.y=t.ry
		touch.time=os.timer()
		touches[t.id]=touch
	end
end)
 
stage:addEventListener(Event.TOUCHES_MOVE,function(e)
 
end)
 
stage:addEventListener(Event.TOUCHES_END,function(e)
	local t=e.touch
	local touch=touches[t.id]
	if touch then --if touch is defined
		local stack=gestureStack[touch.player]
		local x,y=t.rx,t.ry
		local dx=t.rx-touch.x -- get swipe distance
		local dy=t.ry-touch.y
		local adx=-dx<>dx -- get abs swipe distance
		local ady=-dy<>dy
		if adx<=tapDisperse and
			ady<=tapDisperse then
			--can be a tap
			if os.timer()-touch.time>=tapLongTime then
				if tapPriority then
					insert(stack,1,{6,x,y}) -- long tap
				else
					stack[#stack+1]={6,x,y} -- long tap
				end
			else
				if tapPriority then
					insert(stack,1,{5,x,y}) -- tap
				else
					stack[#stack+1]={5,x,y} -- tap
				end
			end
		else
			--can be a swipe
 
			if adx<=swipeDisperse and ady>swipeDistance then -- vertical
				if dy<0 then -- up
					stack[#stack+1]={4,dy}
				else -- down
					stack[#stack+1]={3,dy}
				end
			elseif adx>swipeDistance and
				ady<=swipeDisperse then -- horizontal
				if dx<0 then -- left
					stack[#stack+1]={2,dx}
				else -- right
					stack[#stack+1]={1,dx}
				end
			end
		end
		touches[t.id]=nil
	end
end)
 
function getGesture(player)
	local stack=gestureStack[player or 1]
	if #stack>0 then
		local id=stack[1]
		return id,gestureNames[id[1]]
	end
end
 
function removeGesture(player)
	local stack=gestureStack[player or 1]
	if #stack>0 then
		remove(stack,1)
		return getGesture(player)
	end
end
 
function emptyGestures()
	gestureStack={{},{}}
end
 
function gesturePlayers(no)
	players=no
	emptyGestures()
	return
end
 
function gestureWidth(w)
	width2=w/2
end

So if the screen size changes do this:

gestureWidth(width)

If the number of players changes do this:

gesturePlayers(1)

And for normal usage do this:

for loop=1,#players do
	local gesture,gestureName=getGesture(loop)
	if gesture then
		print("player "..loop,gesture[1],gestureName)
		removeGesture(loop)
	end
end

SinisterSoft · February 2018

I just noticed a huge chunk is missing from the code above - I can see it if I edit the post. Hopefully the forum code block can be fixed soon.

SinisterSoft · February 2018

<width2 was causing an issue, I added a space, code looks ok now.

pie · February 2018

@SinisterSoft super cool, thank you! I'd like to make use of this asap

p.s. speaking about polishing gideros'website:
I believe that the code in this post - as like as many others around - should be moved to the code snippet section to be easily found later

antix · February 2018

@pie, I've never visited the snippets section, I shall look this afternoon

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