screen.lua

local Class = require 'modules.middleclass.middleclass'
local Stateful = require 'modules.stateful.stateful'
local Timer = require 'modules.hump.timer'
local Const = require 'src.const'

local Screen = Class('Screen')
Screen:include(Stateful)
local Iris = Screen:addState('Iris')
local Overlay = Screen:addState('Overlay')

function Screen:initialize(props)
    self.timer = Timer.new()
    self.progress = 0
    props = props or {}
    self.props = {
        length = props.length or 20,
        limit = props.limit or 1,
        easeOut = props.easeOut or 'linear',
        easeIn = props.easeIn or 'linear',
    }
end

function Screen:update(dt)
    self.timer:update(dt)
end

function Screen:fadeOut(after)
    self.progress = 0
    self.timer:clear()
    self.timer:tween(self.props.length, self, { progress = self.props.limit }, self.props.easeOut, function()
        -- tweener has small absolute error
        self.progress = self.props.limit
        if after then after() end
    end)
end

function Screen:fadeIn(after)
    self.progress = self.props.limit
    self.timer:clear()
    self.timer:tween(self.props.length, self, { progress = 0 }, self.props.easeIn, function()
        -- tweener has small absolute error
        self.progress = 0
        if after then after() end
    end)
end

function Screen:irisOut(after)
    Screen.fadeOut(self, after)
    self:gotoState('Iris')
end

function Screen:irisIn(after)
    Screen.fadeIn(self, after)
    self:gotoState('Iris')
end

function Screen:overlayOut(after)
    Screen.fadeOut(self, after)
    self:gotoState('Overlay')
end

function Screen:overlayIn(after)
    Screen.fadeIn(self, after)
    self:gotoState('Overlay')
end

function Screen:inProgress()
    return self.progress > 0 and self.progress < self.props.limit
end

function Screen:draw() end

function Iris:draw()
    if self.progress == 0 then return end
    local sw, sh = Const.SCREEN_WIDTH, Const.SCREEN_HEIGHT
    local cw, ch = sw / 2, sh / 2
    local pw = sw * self.progress
    love.graphics.setColor(0, 0, 0)
    love.graphics.polygon('fill', 0,  ch - cw, 0, ch - cw + pw,  pw, ch - cw)      -- tl
    love.graphics.polygon('fill', sw, ch - cw, sw - pw, ch - cw, sw, ch - cw + pw) -- tr
    love.graphics.polygon('fill', 0,  ch + cw, 0, ch + cw - pw,  pw, ch + cw)      -- bl
    love.graphics.polygon('fill', sw, ch + cw, sw - pw, ch + cw, sw, ch + cw - pw) -- br
    love.graphics.setColor(255, 255, 255)
end

function Overlay:draw()
    if self.progress == 0 then return end
    love.graphics.setColor(0, 0, 0, self.progress * self.props.limit * 255)
    love.graphics.rectangle('fill', 0, 0, Const.SCREEN_WIDTH, Const.SCREEN_HEIGHT)
    love.graphics.setColor(255, 255, 255, 255)
end

return Screen