Multiple Touches

ruxpin

I am working on a two handed pong game, but I am not understanding how to get multiple touches working. I have two paddles on the screen and was originally using mouse event functions, but figured out that you can only move one sprie at a time that way. Then I tried to simply switch the mouse event functions to touch event functions, but that didn't work either. I followed and understand the Touch Explorer example, but I can't wrap my head around how to apply it to a sprite instead of the stage.

Here is my Paddle class and their mouse event functions. Can I simply change those to touch event functions or do I need to do something else?

Paddle = gideros.class(Sprite)   --Input (position) = Should the paddle be on the right or the left of the screen? function Paddle:init(position) bitmap = Bitmap.new(Texture.new("textures/paddle.png")) self:addChild(bitmap)   self:setSize(64, 64)   --Sets the paddle position if position == "right" then self:setX(stage:getWidth() - self:getWidth() - 24) end if position == "left" then self:setX(24) end   self.isFocus = false   self:addEventListener(Event.ENTER_FRAME, self.onEnterFrame, self)   self:addEventListener(Event.MOUSE_DOWN, onMouseDown, self) self:addEventListener(Event.MOUSE_MOVE, onMouseMove, self) self:addEventListener(Event.MOUSE_UP, onMouseUp, self) end   function Paddle:onEnterFrame(event) local x, y = self:getPosition()   if y < 0 then y = 0 end   if y > application:getLogicalWidth() - self:getHeight() then y = application:getLogicalWidth()- self:getHeight() end   self:setPosition(x, y) end   function onMouseDown(self, event) if self:hitTestPoint(event.x, event.y) then self.isFocus = true   self.y0 = event.y   event:stopPropagation() end end   function onMouseMove(self, event) if self.isFocus then local dy = event.y - self.y0   self:setY(self:getY() + dy)   self.y0 = event.y   print(self:getY()) print(application:getLogicalHeight())   event:stopPropagation() end end   function onMouseUp(self, event) if self.isFocus then self.isFocus = false event:stopPropagation() end end

atilim

Hi,

In your case, each paddle should store a "touchid" instead of "isFocus" and only use the touch event whose id is equal to the paddle's touchid.

Here is an example:

Box = gideros.class(Sprite)   function Box:init() local bitmap = Bitmap.new(Texture.new("box.png")) self:addChild(bitmap)   self:addEventListener(Event.TOUCHES_BEGIN, self.onTouchesBegin, self) self:addEventListener(Event.TOUCHES_MOVE, self.onTouchesMove, self) self:addEventListener(Event.TOUCHES_END, self.onTouchesEnd, self) self:addEventListener(Event.TOUCHES_CANCEL, self.onTouchesCancel, self) end   function Box:onTouchesBegin(event) if self.touchid == nil then -- if there isn't any touches assigned to this object for i=1,#event.touches do local touch = event.touches[i] if self:hitTestPoint(touch.x, touch.y) then -- if any of the touches hit the object self.x0 = touch.x self.y0 = touch.y self.touchid = touch.id   event:stopPropagation() -- don't allow some other object get the same touch id do return end -- don't test other touches end end end end   function Box:onTouchesMove(event) for i=1,#event.touches do local touch = event.touches[i] if touch.id == self.touchid then -- if this is our touch, then move the object around local dx = touch.x - self.x0 local dy = touch.y - self.y0   self:setX(self:getX() + dx) self:setY(self:getY() + dy)   self.x0 = touch.x self.y0 = touch.y end end end   function Box:onTouchesEnd(event) for i=1,#event.touches do local touch = event.touches[i] if touch.id == self.touchid then -- if our touch ended self.touchid = nil end end end   function Box:onTouchesCancel(event) self:onTouchesEnd(event) -- same with touchesEnd end