An element for the powder toy that senses key presses and dishes out sparks accordingly.

elem-ksns.lua

--VER 1.1 UPDATE http://pastebin.com/raw.php?i=8Zuy6iB7

-- Keyboard sensor element
-- As per request by thread: http://tpt.io/:17012

-- Set TMP to the key code(!) to enable
-- set TMP2 (optional) to the modifier code to set modifiers
-- Use DEBUG to see the values before setting them 

-- by boxmein with tremendous help from cracker64 and jacob1

local el = elements.allocate("boxmein", "ksns")

local lastkeyn = 0
local lastmod = 0
local pressing = false
local DEBUG = true
local typ = ""

function update (index, partx, party, surround_space, nt)
  local tmp = tpt.get_property("tmp", index)
  local tmp2 = tpt.get_property("tmp2", index)

  
  if pressing then
    -- allow tmp2 to set key modifications (for the sake of shift, ctrl, etc)
    if tmp2 > 0 and lastmod ~= tmp2 then return 0 end


    if tmp == lastkeyn then
      -- sparkle sparkle bitches
      local t = {sim.partNeighbours(partx, party, 2)}

      -- why the fork would t be nil with particles nearby ;_;
      if t == nil then return 0 end

      for _, v in ipairs(t) do 
        if bit.band(elements.property(tpt.get_property("type", v),"Properties"),32) == 32 then
          
          local rx, ry = sim.partPosition(v)
          tpt.create(rx, ry, 15) -- SPRK
        end
      end
    end
  end
end


function key (keys, keyn, mod, evt) 
  lastmod = mod
  if evt == 1 then
    -- pressed
    lastkeyn = keyn
    pressing = true
  elseif evt == 2 then
    -- released
    lastkeyn = keyn
    pressing = false
  end
end

elements.element(el, elements.element(elements.DEFAULT_PT_DMND))
elements.property(el, "Name", "KSNS")
elements.property(el, "Colour", "0xDEADBEEF") 
elements.property(el, "Description", "Keyboard Sensor. Set tmp to key code, (tmp2 to modifier code - optional) to use.") 
elements.property(el, "MenuSection", SC_SENSOR) 


tpt.register_keypress(key)
tpt.element_func(update, el)

-- # ====================================================================== # --
-- # Debugging

if DEBUG then
  -- for the sake of debug only, some might find it of use
  function getmodtext(lastmod)
    modtext = ""
    if lastmod - 256 > 0 then
      modtext = modtext .. "ALT "
      lastmod = lastmod-256
    end
    if lastmod - 64 > 0 then
      modtext = modtext .. "CTRL " 
      lastmod = lastmod-64
    end
    if lastmod - 1 > 0 then
      modtext = modtext .. "SHIFT " 
      lastmod = lastmod-1
    end
    return modtext
  end 

  function debuglog ()
    tpt.drawtext(20, 50, 
      "KSNS Debug: " ..
      "\nkeycode: " .. lastkeyn .. 
      "\nmod: " .. lastmod .. " / " .. getmodtext(lastmod) .. 
      "\npressing: " .. tostring(pressing))
  end

  tpt.register_step(debuglog) 
end