Module:Sprite

-- Based on work by the MC wiki: https://minecraft.gamepedia.com/ and https://minecraft.gamepedia.com/Module:Sprite

local Sprite = {}

local types = {
	inventory = [[Module:InvSprite]],
}

local defaultSettings = {
	scale = 1,
	sheetsize = 256,
	size = 16,
	pos = 1,
	align = 'text-top'
}

function Sprite:new (type)
	source = types[type]
	if not(source) then
		error("Unknown type: " .. tostring(type))
	end
	o = {
		__source = require(source),
		}
	setmetatable(o, {__index = self})
	o:load()
	return o
end

function Sprite:load()
	local settings = self.__source.settings
	self.__settings = {
		size = settings.size,
		sheetWidth = settings.sheetsize,
		tiles = settings.sheetsize / settings.size,
		scale = settings.scale,
		autoScale = settings.autoscale,
	}
	local lSet = self.__settings

	setmetatable(lSet, {__index=defaultSettings})


	styles = {}
	--[[styles["background-image"] = (settings.url and "url(" .. settings.url .. ")") or mw.getCurrentFrame():expandTemplate{
			title = 'FileUrl',
			args = { settings.image}
		} ]]
	styles["background-size"] = lSet.sheetWidth * lSet.scale .. 'px auto'

	local t = lSet.size * lSet.scale .. 'px'

	styles.height = t
	styles.width = t
	styles["vertical-align"] = lSet.align
	self.__styles = styles
end

function Sprite:setItem(item)
	if self.__source.ids[item] then
		self:setPosition(self.__source.ids[item].pos)
	else
		self:setPosition(nil) --will use default
	end
	return self
end

function Sprite:Item(item)
	local sprite = {}
	setmetatable(sprite, {__index = self})
	local settings = {}
	setmetatable(settings, {__index = self.__settings})
	sprite.__settings = settings
	return sprite:setItem(item)
end

function Sprite:setPosition(pos)
	local settings = self.__settings

	local pos = (pos or settings.pos) - 1

	local left = pos % settings.tiles * settings.size * settings.scale
	local top = math.floor( pos / settings.tiles ) * settings.size * settings.scale
	self.__styles["background-position"] = '-' .. left .. 'px -' .. top .. 'px'

	settings.pos = pos + 1
	return self
end

function Sprite:GenerateHTML (html)
	local sprite
	if html then
		sprite = html:tag("div")
	else
		sprite = mw.html.create("div")
	end

	sprite:addClass("sprite")

	local source = self.__source
	sprite:addClass(source.settings.classname)

	local styles = {}
	for k,v in pairs(self.__styles) do
		styles[#styles + 1] = k .. ":" .. v
	end

	sprite:cssText( table.concat( styles, "; " ) )

	return sprite
end

return Sprite
Module:Sprite

See Also
