Module:Sprite

Documentation for this module may be created at Module:Sprite/doc

local p = {}

function p.getSpritePosition( pos, sheetsize, size )
	local spritesPerRow = sheetsize / size
	local row = math.floor(pos / spritesPerRow)
	local col = pos % spritesPerRow
	local x = col * size
	local y = row * size
	return { ['x'] = x, ['y'] = y }
end
	
function p.get(f)
	local args = f
	if f == mw.getCurrentFrame() then 
		args = require( 'Module:ProcessArgs' ).merge( true )
	else
		f = mw.getCurrentFrame()
	end
	local url = args.url
	
	local default = {
		scale = 1,
		sheetsize = 256,
		size = 16,
		pos = 1,
		align = 'text-top'
	}
	local scale = args.scale or default.scale
	local sheetsize = args.sheetsize or default.sheetsize
	local size = args.size or default.size
	local pos = args.pos or default.pos
	local align = args.align or default.align
	local spritePosition = p.getSpritePosition( pos, sheetsize, size )
	
	local fileUrl = f:expandTemplate{title = 'FileUrl', args = {[1] = url} }
	
	local styles = {
		"vertical-align: " .. align,
		"background-position: " .. -spritePosition.x * scale .. "px " .. -spritePosition.y * scale .. "px",
		"background-size: " .. sheetsize * scale .. "px auto",
		"display: inline-block",
		"width: " .. size * scale .. "px",
		"height: " .. size * scale .. "px",
		-- "transform: scale(" .. scale .. ")"
	}
	
	local sprite = mw.html.create( 'span' ):addClass( 'sprite' )
	sprite:addClass( 'pixelated' )
	sprite:cssText( table.concat( styles, ";" ) )
	sprite:attr( 'data-bgimage', fileUrl )
	
	local root = mw.html.create( 'span' )
	root:node( sprite )
	
	return tostring( root )
end

return p