Simple Swipe Right?

MidnightCoffee · December 2017

I apologize if this is a stupid question, but I got the hang of mouse down and mouse up, but how would I detect a swipe to the right?

Thank you!

SinisterSoft · December 2017

You should use an on touch event, then check to see if the the movement is going right over time, eg start a counter, if the event x is moving a specific delta or more and it has done it for x consecutive events then it's it's a swipe to the right.

keszegh · December 2017

the search is not working on the forum, yet i think somebody made a helper class for gestures in the past. search on google for gideros gesture maybe.

Apollo14 · December 2017

There is a ready-made "Gestures" class, I didn't try it myself yet, but I guess it works

http://appcodingeasy.com/Gideros-Mobile/Detecting-Gestures-in-Gideros

keszegh · December 2017

@Apollo14, thanks for finding a link to it.

talis · December 2017

After adding Gestures class in your project the code is so simple to use with Scenemanager.
Add this code snippet to all your secenes to the init function.

local function callback(name)
	if name=='Backward' then
	--Your code when it is backward swipe
        --You can change scene for example if you want
	else
	--Your code when it is forward swipe
        --You can change scene for example if you want
	end
end
 
local gest = Gestures.new({
    debug = true,
    draw = false,
    drawColor = 0xff0000,
    drawWidth = 5,
    autoTrack = true,
    scope = self,
    allowRotation = false,
    inverseShape = false,
    points = 33
})
 
gest:addGesture('Forward', {
    {x = 0, y = 0},
    {x = 0, y = 50}
 
}, callback)
 
 
gest:addGesture('Backward', {
   {x = 50, y = 0},
    {x = 0, y = 0}
}, callback)

MidnightCoffee · December 2017

Thank you everyone for your responses!
I added the Gesture.lua file to my project and added in the above code to my main.lua.
I added in a

print("swiped forward")

after the else in

if name == 'Backward' then

and for some reason it always just prints "swiped forward" even when I'm just touching the screen/tapping.
Did I do something wrong?
Thanks!

oleg · December 2017

simple method

function LevelSelectScene:onMouseDown(event)
 
 startX = event.x
 
 event:stopPropagation()
end
 
function LevelSelectScene:onMouseUp(event)
 
endX = event.x
 
if endX- startX > 100 then
 
  print("Forward")
end
 
end

MidnightCoffee · December 2017

Thank you, but (and I apologize again if this is a stupid question) I changed LevelSelectScene to stage (assuming that was the right thing to do because I don't have anything called that in my game) and nothing happens.
I know I'm missing something, if someone could point me in the right direction I would really appreciate it!!
Thanks so much!

PS: I'm not using the swipe to change scenes or whatever, I'm just using it to activate a "boost" on my character... if that matters at all...?

oleg · December 2017

@MidnightCoffee
listeners added?

stage:addEventListener(Event.MOUSE_DOWN, self.onMouseDown, self)
stage:addEventListener(Event.MOUSE_UP, self.onMouseUp, self)

MidnightCoffee · December 2017

Okay, so now I get an error: "attempt to index global 'self' (a nil value)"
My code is as follows:

-- ///////// Swipe Events //////////
function stage:onMouseDown(event)
 
 startX = event.x
 
 event:stopPropagation()
end
 
function stage:onMouseUp(event)
 
endX = event.x
 
if endX- startX > 100 then
 
  print("Forward")
end
 
end
 
stage:addEventListener(Event.MOUSE_DOWN, self.onMouseDown, self)
stage:addEventListener(Event.MOUSE_UP, self.onMouseUp, self)

Thank you so much for your help! I know I'm making some stupid mistake, but I can't seem to figure it out...

antix · December 2017

Try this instead..

-- ///////// Swipe Events //////////
function onMouseDown(event)
 
 startX = event.x
 
 event:stopPropagation()
end
 
function onMouseUp(event)
 
endX = event.x
 
if endX- startX > 100 then
 
  print("Right")
end
 
end
 
stage:addEventListener(Event.MOUSE_DOWN, onMouseDown)
stage:addEventListener(Event.MOUSE_UP, onMouseUp)

You need to learn about the whole self thingy. self is used within classes to refer to the particular instance of a class. Maybe this tiny example might serve to help..

Thing = Core.class()
 
function Thing:init()
  self.name = "thing" -- this things name
  print(self.name .. " created")
end
 
function Thing:update()
  print(self.name .. " updated")
end
 
local myThing = Thing.new() -- make a new instance of thing
myThing:update() -- will print the things name

I need to improve my skills at explaining stuff I think

MidnightCoffee · December 2017

Got it working! Thanks so much! I really appreciate it!

And thanks for the mini lesson! New to Gideros so that was really helpful!

keszegh · December 2017

@antix, in your example the addEventListeners should not have self.*** but only ***.

antix · December 2017

@keszegh, whoops, you are totally right, corrected

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