Reorganized src folder.

src/utils/classes.lua

@@ -0,0 +1,46 @@
+------------------------------------------------------------------------------
+-- Methods
+------------------------------------------------------------------------------
+
+-- Single inheritance version of the sample code from
+-- http://lua-users.org/wiki/ObjectOrientationTutorial
+local function make_class(BaseClass)
+    -- "cls" is the new class
+    local cls = {}
+
+    -- copy base class contents into the new class
+    if BaseClass ~= nil then
+        for k, v in pairs(BaseClass) do
+            cls[k] = v
+        end
+    end
+
+    -- set the class's __index, and start filling an "is_a" table that contains this class and all of its bases
+    -- so you can do an "instance of" check using my_instance.is_a[MyClass]
+    cls.__index, cls.is_a = cls, {[cls] = true}
+
+    if BaseClass ~= nil then
+        cls.is_a[BaseClass] = true
+    end
+
+    -- the class's __call metamethod
+    setmetatable(cls, {__call = function (c, ...)
+        local instance = setmetatable({}, c)
+
+        -- run the init method if it's there
+        local init = instance._init
+
+        if init then init(instance, ...) end
+        return instance
+    end})
+
+    -- return the new class table, that's ready to fill with methods
+    return cls
+end
+
+
+------------------------------------------------------------------------------
+-- Module return
+------------------------------------------------------------------------------
+
+return make_class

src/utils/fader.lua

@@ -0,0 +1,97 @@
+------------------------------------------------------------------------------
+-- Imports
+------------------------------------------------------------------------------
+
+local love = require 'love'
+local make_class = require 'src.utils.classes'
+
+
+------------------------------------------------------------------------------
+-- Class definitions
+------------------------------------------------------------------------------
+
+local Fader = make_class()
+
+
+------------------------------------------------------------------------------
+-- Class methods
+------------------------------------------------------------------------------
+
+function Fader:_init()
+    self.t = 0.0
+    self.step = 0
+    self.done = true
+    self.reverse = false
+    self.callback = nil
+end
+
+
+function Fader:_reset()
+    self.t = 0
+    self.step = 0
+    self.done = false
+end
+
+
+function Fader:fade_in(callback)
+    self:_reset()
+    self.reverse = true
+    self.callback = callback
+end
+
+
+function Fader:fade_out(callback)
+    self:_reset()
+    self.reverse = false
+    self.callback = callback
+end
+
+
+function Fader:update(dt)
+    if not self.done then
+        self.t = self.t + dt
+
+        if self.t >= 0.009 then
+            self.step = self.step + 1
+            self.t = 0.0
+        end
+
+        if self.step > 175 then
+            self.done = true
+            if self.callback ~= nil then
+                self.callback()
+                self.callback = nil
+            end
+        end
+    end
+end
+
+
+function Fader:draw()
+    local c = 0
+    love.graphics.setColor(0, 0, 0)
+
+    for i = 0, 16 do
+        for j = 0, 10 do
+            if not self.reverse then
+                if c <= self.step then
+                    love.graphics.rectangle('fill', 20 * i, 20 * j, 20, 20)
+                end
+            else
+                if c <= self.step then else
+                    love.graphics.rectangle('fill', 20 * i, 20 * j, 20, 20)
+                end
+            end
+            c = c + 1
+        end
+    end
+
+    love.graphics.setColor()
+end
+
+
+------------------------------------------------------------------------------
+-- Module return
+------------------------------------------------------------------------------
+
+return Fader