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Multitouch and event handling — Gideros Forum
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    Multitouch and event handling

    DikkesnoekDikkesnoek Member
    edited February 2014 in Step by step tutorials
    Hi,

    I've searched for a multitouch tutorial but I coulnd't find one.

    I have two objects to control at the same time (two fingers).
    There are two classes (object1 and object2) which have their
    own mouse event handling routines. I don't know if that is a
    good idea. Probably it's better to do this handling in the main
    class. When I touch one object which I can control, it will
    lose control when I touch the second object with my second
    finger. Is there a tutorial how to handle multitouches?

    Thanks in advance,

    Marc
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    Comments

    • ar2rsawseenar2rsawseen Maintainer
      @Dikkesnoek first to do multi touch handling, you would need to implement Event.TOUCHES_BEGIN, Event.TOUCHES_MOVE, Event.TOUCHES_END events instead of mouse events

      And the second, that you would need to handle touch ids to know which object is dragged with which finger.

      So if for mouse dragging code would look like this:
      function Object:dragStart(e)
	if self:hitTestPoint(e.x, e.y) then
		self._isDragging = true
		self._dragX = self:getX() - e.x
		self._dragY = self:getY() - e.y
	end
end
 
function Object:_dragMove(e)
	if self._isDragging then
		self:setX(e.x + self._dragX)
		self:setY(e.y + self._dragY)
	end
end
 
function Object:_dragEnd(e)
	if self._isDragging then
		self._isDragging = false
	end
end
      then with multi touch dragging it would look more like this:
      function Object:dragStart(e)
	if self:hitTestPoint(e.touch.x, e.touch.y) then
		--identifying drag by id
		self._dragId = e.touch.id
		self._dragX = self:getX() - e.touch.x
		self._dragY = self:getY() - e.touch.y
	end
end
 
function Object:_dragMove(e)
	--identifying drag by id
	if self._dragId == e.touch.id then
		self:setX(e.touch.x + self._dragX)
		self:setY(e.touch.y + self._dragY)
	end
end
 
function Object:_dragEnd(e)
	if self._dragId == e.touch.id then
		self._dragId = nil
	end
end
      http://appcodingeasy.com/Gideros-Mobile
      +1 -1Share on Facebook
    • DikkesnoekDikkesnoek Member
      I will implement and test this. Thanks a lot.

      Marc
      +1 -1Share on Facebook
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