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Library for drag and drop for GIDEROS — Gideros Forum
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    Library for drag and drop for GIDEROS

    psdiaspsdias Member
    edited December 2012 in Game & application design
    Hello!

    Sorry for my bad English!
    (I used an automatic translator, and then I tried to correct my text)


    I am an inexperienced programmer in "mobile" applications and, until few days.
    But, yesterday, I found GIDEROS.

    I am creating a simple board game, where the user must touch in some pieces
    and then position it on the board (like the "checkers" however more simple)

    In CORONA SDK, I was using the "dmc_dragdrop" library, because it
    facilitates the movement of the pieces a lot (drag and drop)

    Here is two links on that library:
    http://docs.davidmccuskey.com/display/docs/Quick+Guide+-+dmc_dragdrop
    http://developer.coronalabs.com/code/dmc-lib-drag-and-drop

    Is there some similar library, for GIDEROS ?

    Thank you for the attention!
    Paulo
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    Comments

    • hgvyas123hgvyas123 Guru
      edited December 2012
      as far as i know there is no library for drag and drop with gideros however drag and drop functionality is very easy see the below code
       
local function onMouseDown(self, event)
	if self:hitTestPoint(event.x, event.y) then
		self.isFocus = true -- mark to chk whether it is selected or not
 
		self.x0 = event.x--store initial position of touch
		self.y0 = event.y
 
		event:stopPropagation() --stop all the touch events or mouse event 
	end
end
 
local function onMouseMove(self, event)
	if self.isFocus then
		local dx = event.x - self.x0--get the diff of initial pos and current touch pos
		local dy = event.y - self.y0
 
		self:setX(self:getX() + dx) -- add this diff to img's x and y pos
		self:setY(self:getY() + dy)
 
		self.x0 = event.x - change the initial pos with new one
		self.y0 = event.y
 
		event:stopPropagation()
	end
end
 
local function onMouseUp(self, event)
	if self.isFocus then
		self.isFocus = false --unmark 
		event:stopPropagation()
	end
end
 
local img = Bitmap.new(Texture.new("img.png"))
img:addEventListener(Event.MOUSE_DOWN, onMouseDown, img)
img:addEventListener(Event.MOUSE_MOVE, onMouseMove, img)
img:addEventListener(Event.MOUSE_UP, onMouseUp, img)
      :)
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    • DRSDRS Member
      There is a drag drop sample in sample files that come with Gideros
      +1 -1Share on Facebook
    • 1dot44mb1dot44mb Member
      Hi and welcome,

      Check this too:
      http://appcodingeasy.com/Gideros-Mobile/Dragging-Box2d-object-in-Gideros-Mobile
      +1 -1Share on Facebook
    • psdiaspsdias Member
      Sorry for my bad English !
      (I used an automatic translator, and then I tried to correct my text)

      Thanks, everyone, for the answers!

      Actually, I need something a little more complex.

      I would like that, when I move a piece over the board, automatically the nearest square of that piece "attract" (like a magnet) the piece for him. Thus, the user don't need positioning the piece exactly inside the "house".

      In Corona SDK, with the "dmc_dragdrop" library that I mentioned above, I got it.

      Please watch the video below, with my program running. Notice that the board squares "attract" (pull) the triangular piece for him:

      http://www.mediafire.com/?lhlcw9g5i0w0ah8

      Thank you very much !
      Paulo



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    • psdiaspsdias Member
      PS: In Brazil, we call each square of the board of "house" :)
      +1 -1Share on Facebook
    • yvz5yvz5 Member
      you can use box2d magnet or just calculate if the piece is in region
      +1 -1Share on Facebook
    • ar2rsawseenar2rsawseen Maintainer
      @psdias yes that would be more complicated than simple dragging and I think I haven't see an example of something similar on this forum.
      And unfortunately you have chosen not the best time to ask for help, since it's a winter holiday, I think no one could really help you by creating a prototype or example for now.

      But if you are up to creating the functionality yourself, the idea would be that you store all center coordinates where you could drop your triangle in a table.
      And then on mouse up or touch end loop through the table and find the nearest point, which is basic comparing of x and y coordinates.
      When you have found the nearest point simply, tween your object to it and that's it ;)
      http://appcodingeasy.com/Gideros-Mobile
      +1 -1Share on Facebook
    • OZAppsOZApps Guru
      @psdias,
      is the triangle an image? If it is then you need to calculate the square that has the maximum portion of the rectangular image (triangle in this example) to determine where it should go. Then when the touch is released, make it tween to the square. To work with squares and board, have a look at these articles,

      http://howto.oz-apps.com/2012/11/games-with-grids-tilemaps.html
      http://howto.oz-apps.com/2012/12/working-with-grids-part-ii.html
      twitter: @ozapps | http://www.oz-apps.com | http://howto.oz-apps.com | http://reviewme.oz-apps.com
      Author of Learn Lua for iOS Game Development from Apress ( http://www.apress.com/9781430246626 )
      Cool Vizify Profile at https://www.vizify.com/oz-apps
      +1 -1Share on Facebook
    • psdiaspsdias Member
      Hello!

      With your suggestions, I got it !

      Thanks for everybody!

      Paulo
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