local sliceTouches = {}
slicesLayer = Sprite.new()
stage:addChild(slicesLayer)

local function onTouchesBegin(event)
 if(sliceTouches[event.touch.id] == nil) then
  sliceTouches[event.touch.id] = {x=nil, y=nil, xs={}, ys={}, ss={}, shape = Shape.new()}
  local sliceTouch = sliceTouches[event.touch.id]
 
  slicesLayer:addChild(sliceTouch.shape)
  sliceTouch.x, sliceTouch.y = event.touch.x, event.touch.y
 
 else
  local sliceTouch = sliceTouches[event.touch.id]
  sliceTouch.x, sliceTouch.y = event.touch.x, event.touch.y
 end
end

local function onTouchesMove(event)
 local sliceTouch = sliceTouches[event.touch.id]
 sliceTouch.x, sliceTouch.y = event.touch.x, event.touch.y
end

local function onTouchesEnd(event)
 local sliceTouch = sliceTouches[event.touch.id]
 sliceTouch.x, sliceTouch.y = nil, nil
end

local function onTouchesCancel(event)
 local sliceTouch = sliceTouches[event.touch.id]
 sliceTouch.x, sliceTouch.y = nil, nil
end

function onEnterFrame()
 for e =1, #sliceTouches do
  local sliceTouch = sliceTouches[e]
  
  if sliceTouch.x and sliceTouch.y then
   sliceTouch.xs[#sliceTouch.xs + 1] = sliceTouch.x
   sliceTouch.ys[#sliceTouch.ys + 1] = sliceTouch.y
   sliceTouch.ss[#sliceTouch.ss + 1] = 10
  end
   
  while #sliceTouch.ss > 0 and sliceTouch.ss[1] <= 1 do
   table.remove(sliceTouch.xs, 1)
   table.remove(sliceTouch.ys, 1)
   table.remove(sliceTouch.ss, 1)
  end

  sliceTouch.shape:clear()
  for i=1,#sliceTouch.xs-1 do
   sliceTouch.shape:setLineStyle(sliceTouch.ss[i], 0x8080ff)
   sliceTouch.shape:beginPath()
   sliceTouch.shape:moveTo(sliceTouch.xs[i], sliceTouch.ys[i])
   sliceTouch.shape:lineTo(sliceTouch.xs[i+1], sliceTouch.ys[i+1])
   sliceTouch.shape:endPath()
  end

  for i=1,#sliceTouch.ss do
   sliceTouch.ss[i] = sliceTouch.ss[i] - 1
  end

  if #sliceTouch.ss > 0 then
   local x2 = sliceTouch.xs[#sliceTouch.ss]
   local y2 = sliceTouch.ys[#sliceTouch.ss]
  
   for i=#sliceTouch.ss-1, 1, -1 do
    local x1 = sliceTouch.xs[i]
    local y1 = sliceTouch.ys[i]
   
    local d = (x1 - x2) * (x1 - x2) + (y1 - y2) * (y1 - y2)
    if d > 10 then
     split(x1, y1, x2, y2)
    end   
   end
  end
 end
end

stage:addEventListener(Event.TOUCHES_BEGIN, onTouchesBegin)
stage:addEventListener(Event.TOUCHES_MOVE, onTouchesMove)
stage:addEventListener(Event.TOUCHES_END, onTouchesEnd)
stage:addEventListener(Event.TOUCHES_CANCEL, onTouchesCancel)
stage:addEventListener(Event.ENTER_FRAME, onEnterFrame)