sonic-radiance/sonic-radiance.love/game/modules/tweenmanager/init.lua

local TweenManager = Object:extend()

local tween = require "game.modules.tweenmanager.libs.tween"

function TweenManager:new(subject)
  self.subject  = subject
  self.timer    = 0

  self.tweens   = {}
  self.switches = {}
end

function TweenManager:newTween(start, duration, target, easing)
  local newTween = {}
  -- we add the data into a tween wrapper
  newTween.tween = tween.new(duration, self.subject, target, easing)
  newTween.start = self.timer + start -- /!\ START IS RELATIVE TO CURRENT TIME
  newTween.clear = newTween.start + duration

  table.insert(self.tweens, newTween)
end

function TweenManager:newSwitch(start, bools)
  local newSwitch = {}
  -- we add the data into a tween wrapper
  newSwitch.bools = bools
  newSwitch.start = self.timer + start -- /!\ START IS RELATIVE TO CURRENT TIME
  newSwitch.clear = newSwitch.start + 1

  table.insert(self.switches, newSwitch)
end

function TweenManager:update(dt)
  self.timer = self.timer + dt

  for i, tweenWrapper in ipairs(self.tweens) do
    if (self.timer > tweenWrapper.start) then
      tweenWrapper.tween:update(dt)
    end
  end

  for i, switch in ipairs(self.switches) do
    if (self.timer > switch.start) then
      -- We test each boolean in the switch
      for i, bool in ipairs(switch.bools) do
        -- if it's nil, we set it to true
        if self.subject[bool] == nil then
          self.subject[bool] = true
        else
          -- if it's not nil, we reverse the boolean
          self.subject[bool] = (self.subject[bool] == false)
        end
      end
      table.remove(self.switches, i)
    end
  end

  self:clearEndedTweens()
end

function TweenManager:clearEndedTweens(dt)
  for i, tweenWrapper in ipairs(self.tweens) do
    if (self.timer > tweenWrapper.clear) then
      table.remove(self.tweens, i)
    end
  end
end

return TweenManager