Factorio Forums

• .json files describe the game objects and their properties. For example the furnace object is described by this file:

  Code: Select all

    {
      "type": "furnace",
      "name": "stone-furnace",
      "flags": ["placeable-neutral", "player-creation"],
      "collision-box": [[-0.7, -0.7], [0.7, 0.7]],
      "selection-box": [[-0.8, -1], [0.8, 1]], 
      "minable": { "mining-time": 1, "result": "stone-furnace"},
      "max-health": 20,
      "source-inventory-size": 1,
      "result-inventory-size": 1,
      "burner":
      {    
        "heat-capacity": 100, 
        "heat-loss": 0.01,
        "heat-transport-speed": 0.005,
        "burning-speed": 0.001,
        "effectivity": 1000,
        "fuel-inventory-size": 1,
        "smoke":
        [    
          {    
            "name": "smoke",
            "frequency": 0.5, 
            "deviation": [0.1, 0.1],
            "position": [0, -2.3]
          }
        ]
      },
      "picture":
      {    
        "filename": "entity/stone-furnace/stone-furnace.png",
        "priority": "extra-high",
        "width": 96,
        "height": 96
      },
      "fire-animation":
      {
        "filename": "entity/stone-furnace/stone-furnace-fire.png",
        "priority": "extra-high",
        "frame-width": 18,
        "frame-height": 17,
        "frame-count": 16
      },
      "drawing-position": [0.35, -0.1],
      "fire-drawing-position": [-0.021875, 0.5234375],
      "drawing-scale": 0.7
    },   
  

  Using these files, you can modify recipes, and some behavior of the objects. It is limited mostly to simple modifications and changing numbers.
• .lua files describe behavior of the level. You can script events such as attacks of enemies or starting position. There is an interface to the C++ code which allow you to call some functions of the game.
  
  For example, if you want to remove the creeper attacks in the 3rd demo level, you can just delete the following lines in the control.lua file:

  Code: Select all

  game.setmulticommand({type=defines.command.attack,
                            target=glob.player,
                            distraction=defines.distraction.byenemy},
                            glob.attackcount)
  

  And if you want to modify it in some existing save game, you can remove it from the control.lua file from the save game.

Narc wrote:...also, why does your game.oninit always have the comment "create a target chest"? Leftovers from an old version?

kovarex wrote:I started writing some rough documentation of the scripting on wiki. (http://kovarex.com/wiki/index.php/Game_scripting)

rk84 wrote:I would like to make the creeper wave size depend on number of steam engines. How I check the engine count?

kovarex wrote: There is not very simple way to do that now.
You can keep track of the count steam engines by handling these events: onbuiltentity, onplayermineditem, onunitdied. when the name is steam-engine.

We will most probably add some native support of this later.

Valkor wrote:I looked through demo level 2's control.lua hoping to find out how to generate cheaty chests, but that doesn't seem to be handled with lua. Being able to manipulate chest inventories would be a lot of fun, especially on a Feed The Beast style map where the goal is to make an insane amount of items as quickly as possible. In that style of map, you are constrained by key resources that is given to you in a rewards chest.

I want to make rewards chests, cheaty chests, and "magic" chests that do things to their contents

require "util"
require "defines"

-- create a target chest
game.oninit = function()
  glob.chest = game.createentity{name="steel-chest", position={x=13, y=3}}
  local chestinventory = glob.chest.getinventory(defines.inventory.chest)
  chestinventory.insert({name="iron-plate", count="256"})
  chestinventory.insert({name="copper-plate", count="128"})
  chestinventory.insert({name="steel-plate", count="128"})
  chestinventory.insert({name="basic-transport-belt", count="64"})
  chestinventory.insert({name="fast-transport-belt", count="128"})
  chestinventory.insert({name="express-transport-belt", count="128"})
  chestinventory.insert({name="basic-mining-drill", count="128"})
  chestinventory.insert({name="gun-turret", count="64"})
  chestinventory.insert({name="rocket-turret", count="64"})
  chestinventory.insert({name="basic-inserter", count="64"})
  chestinventory.insert({name="fast-inserter", count="64"})
  chestinventory.insert({name="long-handed-inserter", count="64"})
  chestinventory.insert({name="filter-inserter", count="64"})
  chestinventory.insert({name="smart-inserter", count="64"})
  chestinventory.insert({name="iron-gear-wheel", count="64"})
  chestinventory.insert({name="steam-engine", count="8"})
  chestinventory.insert({name="small-electric-pole", count="32"})
  chestinventory.insert({name="wood", count="64"})
  chestinventory.insert({name="coal", count="128"})
  chestinventory.insert({name="car", count="1"})
  chestinventory.insert({name="pipe", count="64"})
  chestinventory.insert({name="iron-axe", count="10"})
  chestinventory.insert({name="pistol", count="1"})
  chestinventory.insert({name="rocket-launcher", count="1"})
  chestinventory.insert({name="basic-bullet-magazine", count="100"})
  chestinventory.insert({name="piercing-bullet-magazine", count="100"})
  chestinventory.insert({name="rocket", count="100"})
  chestinventory.insert({name="stone", count="128"})
  chestinventory.insert({name="stone-furnace", count="64"})
  chestinventory.insert({name="electronic-circuit", count="256"})
end

kovarex wrote: Here is the example of our testing script we have been using during the developement:

Narc wrote:Well, the player *is* an entity, it does have coordinates:

Code: Select all

var thePlayer = game.getPlayer()
-- thePlayer is at thePlayer.position.x by thePlayer.position.y

I haven't played with Lua in a while, but that should be in the right ballpark.

Polymorph wrote:While printing all of the functions in game I noticed one that would be useful in some of my experiments: findentities.

local entities = game.findentities{topleft = {x = event.createdentity.position.x - 1,
                                              y = event.createdentity.position.y - 1},
                                   bottomright = {x = event.createdentity.position.x + 1,
                                                  y = event.createdentity.position.y + 1}}

There's also getentitybytag, but I'm not sure if it gets more than one entity

slpwnd wrote:

Polymorph wrote:

Code: Select all

local entities = game.findentities{topleft = {x = event.createdentity.position.x - 1,
                                              y = event.createdentity.position.y - 1},
                                   bottomright = {x = event.createdentity.position.x + 1,
                                                  y = event.createdentity.position.y + 1}}

local entities = game.findentities([[event.createdentity.position.x - 1, event.createdentity.position.y - 1],
                                    [event.createdentity.position.x + 1, event.createdentity.position.y + 1]])