entity-spawner.lua

EntitySpawner = class("EntitySpawner")

---
-- EntitySpawner:initialize
-- A simple entity spawner.
--
-- @param x         X position
-- @param y         Y position
-- @param entity    The name of the entity to spawn
-- @param params    Parameters used to spawn the entity
-- @param interval  Interval between spawning. Also accepts a table {min, max} for randomized intervals
-- @param amount    Amount of entities to spawn. Also accepts a table {min, max} for randomized amount
--
function EntitySpawner:initialize(data)
    self.x = data.x
    self.y = data.y
    self.entity = data.type
    self.params = data.params
    self.interval = data.interval
    self.amount = data.amount

    self.objectid = game.addObject(self)

    self.nextFire = 0
end


---
-- EntitySpawner:update
-- Spawns an entity if needed.
--
function EntitySpawner:update(dt)
    if game.time >= self.nextFire then
        for i=1, math.random(unpack(self.amount)) do
            _G[self.entity]:new(self.x, self.y)
        end

        if self.interval[1] == 0 and self.interval[2] == 0 then
            self.nextFire = 8999
        else
            self.nextFire = game.time + math.random() * (self.interval[2] - self.interval[1]) + self.interval[1]
        end
    end
end


---
-- EntitySpawner:draw
-- Does nothing.
--
function EntitySpawner:draw()

end