Handling cards in a digital card game

Questions
6

It will most likely work well in most cases. I’m merely offering another solution which will be more efficient in some situations where you have many objects. Here’s modified code which shows a bit of what I mean:

local function add_card(self, position, data)
	local component = "/cardInstance#card_factory"
	print("Card name: " .. tostring(data.name))
	local go_id = factory.create(component, position, nil, nil, .3)
	table.insert(self.cards, {
		id = go_id,
		data = data,
	})
end

local function remove_card(self, id)
	for i,card in ipairs(self.cards) do
		if card.id == id then
			go.delete(id)
			table.remove(self.cards, i)
			return
		end
	end
	error("Unable to find card!")
end

-- factory.script
local function generate_cards(self, _, response)
  -- store list of cards here
  self.cards = {}
  
  local data = json.decode(response.response)
  local p = go.get_position()

  -- looping over the cards
  for k, v in pairs(data) do
  	p.x = p.x + 200
	v.score = 10 -- why isn't the score in the data?
	add_card(self, p, v)
  end
end

local function do_stuff_with_cards(self)
	local total_score = 0
	for _,card in ipairs(self.cards) do
		go.animate(card.id, "euler.z", go.PLAYBACK_ONCE_FORWARD, 360, go.EASING_INOUT_QUAD, 1)
		total_score = total_score + card.score
	end
	print(total_score)
end

function init(self)
  http.request("http://localhost/mygame/cards.json", "GET", generate_cards)
end

Another example where you want this approach is in for instance a shoot’em up game where you may have hundreds of bullets. You don’t want a script on each bullet to handle bullet movement. You want a single bullet handler that moves the bullets. And in the simple case of moving bullets in a straight line you’d use go.animate() and maybe not even a bullet handler.

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