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Is there a way to detect a diagonal swipe using Gestures in Gideros? — Gideros Forum
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    Is there a way to detect a diagonal swipe using Gestures in Gideros?

    AxlFlameAxlFlame Member
    edited October 2014 in Game & application design
    Hey, guys!

    I am trying to create a scene on my game where the player must do a diagonal swipe (bottom left to top right, vice-versa). I'm using the Gestures.lua that @ar2rsawseen created, but I can't make the class recognize only the diagonal swipe...

    I'm adding the gesture like this:
    	self.gest:addGesture("Cut", {
		{x = 0, y = 0},
		{x = 75, y = 50}
	}, self.callback)
    To be honest, I don't understand the class very well, so the points are probably wrong...
    Can someone help?
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    Comments

    • HubertRonaldHubertRonald Member
      Hi @AxlFlame

      Check this link
      http://giderosmobile.com/forum/discussion/773/scenemanager-and-managing-memory/p1

      Here you're going to find @ndoss 's swipe version (his performance)

      I hope the above serve you something

      Cheers

      Likes: AxlFlame


      [-] Liasoft
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    • AxlFlameAxlFlame Member
      Hey, @HubertRonald!

      I think I don't see the solution I'm looking for on that topic, unfortunately. What I want is to be able to detect a diagonal swipe on the screen (in-game it's gonna be like a sword slash). I don't know how I would implement this other swipe method you're talking about. Can you explain it to me?

      I thought about using @ar2rsawseen 's Gestures.lua, because then I would just need to find out which points would correspond to a diagonal swipe within a given scope.
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    • ar2rsawseenar2rsawseen Maintainer
      Hello @AxlFlame

      Unfotunately Gestures.lua won't help you for two reasons.

      1) It is meant to detect closest gesture from a set of gestures, so if you only define one gesture, then to any gesture you make, the closest one will be the one you defined

      2) I think there was a bug in single line gestures, that their rotation and direction was not properly taken care off

      About swipe Gestures, I created something like this some time before:
      https://github.com/ar2rsawseen/GiderosCodingEasy/blob/master/GestureEventEasy.lua

      But unfortunately it only handles up, down, left, right swipes, but diagonal swipes can be added in similar manner, all you need is to determine direction, or if you don't care which direction it is, as long as it is diagonal swipe, you can even do something as:
      --can be a swipe event
if math.abs(e.touch.x - touches[e.touch.id].x) <= sets.swipeDisperse and
	math.abs(e.touch.y - touches[e.touch.id].y) > sets.swipeDistance then --vertical
	e.swipeDistance = e.touch.y - touches[e.touch.id].y
	if e.touch.y - touches[e.touch.id].y > 0 then --down
		dispatchSwipeEvent(Event.SWIPE_DOWN, e)
	else --up
		dispatchSwipeEvent(Event.SWIPE_UP, e)
	end
elseif math.abs(e.touch.x - touches[e.touch.id].x) > sets.swipeDistance and
	math.abs(e.touch.y - touches[e.touch.id].y) <= sets.swipeDisperse then --horizontal
	e.swipeDistance = e.touch.x - touches[e.touch.id].x
	if e.touch.x - touches[e.touch.id].x > 0 then --right
		dispatchSwipeEvent(Event.SWIPE_RIGHT, e)
	else --left
		dispatchSwipeEvent(Event.SWIPE_LEFT, e)
	end
else -- if it is not vertical nor horizontal swipe
	local dx = e.touch.x - touches[e.touch.id].x
	local dy = e.touch.y - touches[e.touch.id].y
	--check distance of the swipe
	if math.sqrt(dx*dx + dy*dy) > sets.swipeDistance then
		dispatchSwipeEvent("swipeDiagonal", e)
	end
end

      Likes: AxlFlame

      http://appcodingeasy.com/Gideros-Mobile
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