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type = "offshore-pump"

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-- run our code once every X ticks:
local tick_throttle = 30 -- every 1/2 second, so our code runs twice per second

-- event handler function
local function handle_on_tick( event )
  if event.tick % update_throttle == 0 then
    -- your code goes here
  end
end

-- link above event handler to the event
script.on_event( defines.event.on_tick, handle_on_tick )

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-- shortcut to defines.events table
local events = defines.events

-- event groups
-- Note: Some of the event names might change in Factorio 0.15
local built = { events.on_built_entity, events.on_robot_built_entity }
local died  = events.on_entity_died
local mined = { events.on_preplayer_mined_item, events.on_robot_pre_mined }

-- this is the entity that user will place on map
-- must be an offshore-pump type entity (restrict to water edge)
-- entity name is whatever you used in your prototype definition
local placement = "your-placement-entity-name"

-- when the entity above is placed, what does it get replaced with?
-- this can be any entity type, so long as it doesn't collide with water tiles
local replacement = "you-replacement-entity-name"

-- mandatory: handle creation of placement entity
-- and swap to replacement entity
local function handle_placement_built( event )

  -- get details of placed entity
  local placed = event.entity

  -- bail out if not placement entity
  if placed.name ~= placement then return end

  -- store key properties of placed entity
  local dir, pos, player, force, surface

  dir    = placed.direction
  pos    = placed.position
  player  = placed.last_user -- optional
  force  = placed.force
  surface = placed.surface

  -- note: For 'player', it won't be defined if robot built entity
  -- so if you plan on using it you have to check event.robot first
  -- (not included here for sake of brevity)

  -- optional: rotate direction by 180º (depends on what you're trying to do)
  -- robbed from FARL oppositedirection() at
  -- https://github.com/Choumiko/FARL/blob/master/FARL.lua
  dir = (dir + 4) % 8

  -- delete the old entity
  placed.destroy()

  -- now create replacement entity in same location
  replace = surface.create_entity {
    name      = replacement;
    position  = pos;
    direction = dir;
    force     = force;
  }
end

-- optional: handle destruction of replacement entity
function handle_replacement_died( event )

  -- bail out if not relevant entity
  if event.entity.name ~= replacement then return end

  -- your code here
end

-- optional: handle entity mined
local function handle_replacement_mined( event )

  -- bail out if not relevant entity
  if event.entity.name ~= replacement then return end

  -- your code here
end

-- attach handlers to events
script.on_event( built, handle_placement_built )
script.on_event( died, handle_replacement_died )
script.on_event( mined, handle_replacement_mined )

Code: Select all

local events = defines.events

local robot_built = events.on_robot_built_entity
local built = events.on_built_entity
local died = events.on_entity_died

local placement = "sewage-pipe-placer"

local replacement = "sewage-pipe"

local function handle_placement_built( event )

	local placed = event.entity
	
	if placed.name ~= placement then return end
	
	local dir, pos, player, force, surface
	
	dir = placed.direction
	pos = place.position
	
	force = placed.force
	
	placed.destroy()
	
	replace = surface.create_entity {
		name = replacement,
		position = pos,
		direction = dir,
		force = force,
	}
end

script.on_event( built, handle_placement_built )

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Error while running event on_built_entity (ID 6)
__sewage_pipe__/control.lua:15: attempt to index local 'placed' (a nil value)