local component = require("component")
local vector2 = require("vector2")
local color3 = require("color3")
local draw = require("draw")
local event = require("event")
local gpu = component.gpu

local w,h = gpu.getResolution()
local mh,mw = h/2, w/2

local center = vector2.new(mw,mh)

local lastTouch = center

-- shell

while true do
  local _,_,x,y = event.pull("touch")
  
  local touch = vector2.new(x,y)
  draw.line(touch,lastTouch,color3.fromRGB(255,255,255))

  lastTouch = touch
end