learned how to create class like things in lua finally so I took out other peoples code

lib/body.lua

@@ -1,110 +1,114 @@
 local _PACKAGE    = (...):match("^(.+)[%./][^%./]+") or ""
-local class       = require(_PACKAGE.."/class")
 local normal_map  = require(_PACKAGE..'/normal_map')
 local util        = require(_PACKAGE..'/util')
 local anim8       = require(_PACKAGE..'/anim8')
 local vector      = require(_PACKAGE..'/vector')
-local body        = class()
+
+local body        = {}
+body.__index = body
 
 body.glowShader     = love.graphics.newShader(_PACKAGE.."/shaders/glow.glsl")
 body.materialShader = love.graphics.newShader(_PACKAGE.."/shaders/material.glsl")
 
-function body:init(id, type, ...)
+local function new(id, type, ...)
 	local args = {...}
-	self.id = id
-	self.type = type
-	self.shine = true
-	self.red = 1.0
-	self.green = 1.0
-	self.blue = 1.0
-	self.alpha = 1.0
-	self.glowRed = 255
-	self.glowGreen = 255
-	self.glowBlue = 255
-	self.glowStrength = 0.0
-	self.tileX = 0
-	self.tileY = 0
-  self.zheight = 1
+  local obj = setmetatable({}, body)
+	obj.id = id
+	obj.type = type
+	obj.shine = true
+	obj.red = 1.0
+	obj.green = 1.0
+	obj.blue = 1.0
+	obj.alpha = 1.0
+	obj.glowRed = 255
+	obj.glowGreen = 255
+	obj.glowBlue = 255
+	obj.glowStrength = 0.0
+	obj.tileX = 0
+	obj.tileY = 0
+  obj.zheight = 1
  
-  self.castsNoShadow = false
-  self.visible = true
-  self.is_on_screen = true
+  obj.castsNoShadow = false
+  obj.visible = true
+  obj.is_on_screen = true
 
-	if self.type == "circle" then
-		self.x = args[1] or 0
-		self.y = args[2] or 0
+	if obj.type == "circle" then
+		obj.x = args[1] or 0
+		obj.y = args[2] or 0
 
     circle_canvas = love.graphics.newCanvas(args[3]*2, args[3]*2)
     util.drawto(circle_canvas, 0, 0, 1, function()
       love.graphics.circle('fill', args[3], args[3], args[3]) 
     end)
-    self.img = love.graphics.newImage(circle_canvas:getImageData()) 
-    self.imgWidth = self.img:getWidth()
-    self.imgHeight = self.img:getHeight()
-    self.ix = self.imgWidth * 0.5
-    self.iy = self.imgHeight * 0.5
-    self:generateNormalMapFlat("top")
+    obj.img = love.graphics.newImage(circle_canvas:getImageData()) 
+    obj.imgWidth = obj.img:getWidth()
+    obj.imgHeight = obj.img:getHeight()
+    obj.ix = obj.imgWidth * 0.5
+    obj.iy = obj.imgHeight * 0.5
+    obj:generateNormalMapFlat("top")
 
-    self:setShadowType('circle', args[3], args[4], args[5])
-	elseif self.type == "rectangle" then
-		self.x = args[1] or 0
-		self.y = args[2] or 0
+    obj:setShadowType('circle', args[3], args[4], args[5])
+	elseif obj.type == "rectangle" then
+		obj.x = args[1] or 0
+		obj.y = args[2] or 0
 
     local rectangle_canvas = love.graphics.newCanvas(args[3], args[4])
     util.drawto(rectangle_canvas, 0, 0, 1, function()
       love.graphics.rectangle('fill', 0, 0, args[3], args[4]) 
     end)
-    self.img = love.graphics.newImage(rectangle_canvas:getImageData()) 
-    self.imgWidth = self.img:getWidth()
-    self.imgHeight = self.img:getHeight()
-    self.ix = self.imgWidth * 0.5
-    self.iy = self.imgHeight * 0.5
-    self:generateNormalMapFlat("top")
+    obj.img = love.graphics.newImage(rectangle_canvas:getImageData()) 
+    obj.imgWidth = obj.img:getWidth()
+    obj.imgHeight = obj.img:getHeight()
+    obj.ix = obj.imgWidth * 0.5
+    obj.iy = obj.imgHeight * 0.5
+    obj:generateNormalMapFlat("top")
 
-    self:setShadowType('rectangle', args[3], args[4])
-	elseif self.type == "polygon" then
-    self:setPoints(...)
-	elseif self.type == "image" then
-		self.img = args[1]
-		self.x = args[2] or 0
-		self.y = args[3] or 0
-		if self.img then
-			self.imgWidth = self.img:getWidth()
-			self.imgHeight = self.img:getHeight()
-			self.ix = self.imgWidth * 0.5
-			self.iy = self.imgHeight * 0.5
+    obj:setShadowType('rectangle', args[3], args[4])
+	elseif obj.type == "polygon" then
+    obj:setPoints(...)
+	elseif obj.type == "image" then
+		obj.img = args[1]
+		obj.x = args[2] or 0
+		obj.y = args[3] or 0
+		if obj.img then
+			obj.imgWidth = obj.img:getWidth()
+			obj.imgHeight = obj.img:getHeight()
+			obj.ix = obj.imgWidth * 0.5
+			obj.iy = obj.imgHeight * 0.5
 		end
-    self:generateNormalMapFlat("top")
-    self:setShadowType('rectangle', args[4] or self.imgWidth, args[5] or self.imgHeight, args[6], args[7])
-		self.reflective = true
-  elseif self.type == "animation" then
-		self.img = args[1]
-		self.x = args[2] or 0
-		self.y = args[3] or 0
-    self.animations = {}
-    self.castsNoShadow = true
-    self:generateNormalMapFlat("top")
-		self.reflective = true
-	elseif self.type == "refraction" then
-    self.x = args[2] or 0
-    self.y = args[3] or 0
-    self:setNormalMap(args[1], args[4], args[5])
-    self.width = args[4] or self.normalWidth
-    self.height = args[5] or self.normalHeight
-    self.ox = self.width * 0.5
-    self.oy = self.height * 0.5
-    self.refraction = true
-  elseif self.type == "reflection" then
-    self.x = args[2] or 0
-    self.y = args[3] or 0
-    self:setNormalMap(args[1], args[4], args[5])
-    self.width = args[4] or self.normalWidth
-    self.height = args[5] or self.normalHeight
-    self.ox = self.width * 0.5
-    self.oy = self.height * 0.5
-    self.reflection = true
+    obj:generateNormalMapFlat("top")
+    obj:setShadowType('rectangle', args[4] or obj.imgWidth, args[5] or obj.imgHeight, args[6], args[7])
+		obj.reflective = true
+  elseif obj.type == "animation" then
+		obj.img = args[1]
+		obj.x = args[2] or 0
+		obj.y = args[3] or 0
+    obj.animations = {}
+    obj.castsNoShadow = true
+    obj:generateNormalMapFlat("top")
+		obj.reflective = true
+	elseif obj.type == "refraction" then
+    obj.x = args[2] or 0
+    obj.y = args[3] or 0
+    obj:setNormalMap(args[1], args[4], args[5])
+    obj.width = args[4] or obj.normalWidth
+    obj.height = args[5] or obj.normalHeight
+    obj.ox = obj.width * 0.5
+    obj.oy = obj.height * 0.5
+    obj.refraction = true
+  elseif obj.type == "reflection" then
+    obj.x = args[2] or 0
+    obj.y = args[3] or 0
+    obj:setNormalMap(args[1], args[4], args[5])
+    obj.width = args[4] or obj.normalWidth
+    obj.height = args[5] or obj.normalHeight
+    obj.ox = obj.width * 0.5
+    obj.oy = obj.height * 0.5
+    obj.reflection = true
 	end
-  self.old_x, self.old_y = self.x, self.y
+  obj.old_x, obj.old_y = obj.x, obj.y
+
+  return obj
 end
 
 -- refresh
@@ -714,4 +718,4 @@ function body:drawImageShadow(light)
   love.graphics.draw(self.shadowMesh, self.x - self.ox, self.y - self.oy, 0, s, s)
 end
 
-return body
+return setmetatable({new = new}, {__call = function(_, ...) return new(...) end})

lib/class.lua

@@ -1,47 +0,0 @@
--- class.lua
--- Compatible with Lua 5.1 (not 5.0).
-local class = function(base, init)
-   local c = {}    -- a new class instance
-   if not init and type(base) == 'function' then
-      init = base
-      base = nil
-   elseif type(base) == 'table' then
-    -- our new class is a shallow copy of the base class!
-      for i,v in pairs(base) do
-         c[i] = v
-      end
-      c._base = base
-   end
-   -- the class will be the metatable for all its objects,
-   -- and they will look up their methods in it.
-   c.__index = c
-
-   -- expose a constructor which can be called by <classname>(<args>)
-   local mt = {}
-   mt.__call = function(class_tbl, ...)
-   local obj = {}
-   setmetatable(obj,c)
-   if class_tbl.init then
-      class_tbl.init(obj,...)
-   else 
-      -- make sure that any stuff from the base class is initialized!
-      if base and base.init then
-      base.init(obj, ...)
-      end
-   end
-   return obj
-   end
-   c.init = init
-   c.is_a = function(self, klass)
-      local m = getmetatable(self)
-      while m do 
-         if m == klass then return true end
-         m = m._base
-      end
-      return false
-   end
-   setmetatable(c, mt)
-   return c
-end
-
-return class

lib/init.lua

@@ -23,42 +23,46 @@ SOFTWARE.
 ]]
 local _PACKAGE = string.gsub(...,"%.","/") or ""
 if string.len(_PACKAGE) > 0 then _PACKAGE = _PACKAGE .. "/" end
-local class = require(_PACKAGE..'class')
 local Light = require(_PACKAGE..'light')
 local Body = require(_PACKAGE..'body')
 local util = require(_PACKAGE..'util')
 local PostShader = require(_PACKAGE..'postshader')
 
-local light_world = class()
+local light_world = {}
+light_world.__index = light_world
 
 light_world.shadowShader       = love.graphics.newShader(_PACKAGE.."/shaders/shadow.glsl")
 light_world.refractionShader   = love.graphics.newShader(_PACKAGE.."shaders/refraction.glsl")
 light_world.reflectionShader   = love.graphics.newShader(_PACKAGE.."shaders/reflection.glsl")
 
-function light_world:init(options)
-	self.lights = {}
-	self.bodies = {}
-  self.post_shader = PostShader()
+local function new(options)
+  local obj = {}
+	obj.lights = {}
+	obj.bodies = {}
+  obj.post_shader = PostShader()
+  
+  obj.l, obj.t, obj.s      =  0, 0, 1 
+	obj.ambient              = {0, 0, 0}
+	obj.refractionStrength   = 8.0
+	obj.reflectionStrength   = 16.0
+	obj.reflectionVisibility = 1.0
+	obj.shadowBlur           = 2.0
+	obj.glowBlur             = 1.0
+	obj.glowTimer            = 0.0
+	obj.glowDown             = false
 
-  self.l, self.t, self.s    =  0, 0, 1 
-	self.ambient              = {0, 0, 0}
-	self.refractionStrength   = 8.0
-	self.reflectionStrength   = 16.0
-	self.reflectionVisibility = 1.0
-	self.shadowBlur           = 2.0
-	self.glowBlur             = 1.0
-	self.glowTimer            = 0.0
-	self.glowDown             = false
-
-  self.disableGlow          = false
-  self.disableMaterial      = false
-  self.disableReflection    = true
-  self.disableRefraction    = true
+  obj.disableGlow          = false
+  obj.disableMaterial      = false
+  obj.disableReflection    = true
+  obj.disableRefraction    = true
 
   options = options or {}
-  for k, v in pairs(options) do self[k] = v end
+  for k, v in pairs(options) do obj[k] = v end
 
-  self:refreshScreenSize()
+  local world = setmetatable(obj, light_world)
+  world:refreshScreenSize()
+
+  return world
 end
 
 function light_world:refreshScreenSize(w, h)
@@ -304,4 +308,4 @@ function light_world:remove(to_kill)
   return false
 end
 
-return light_world
+return setmetatable({new = new}, {__call = function(_, ...) return new(...) end})

lib/light.lua

@@ -1,24 +1,28 @@
 local _PACKAGE = (...):match("^(.+)[%./][^%./]+") or ""
-local class = require(_PACKAGE.."/class")
 local util = require(_PACKAGE..'/util')
 
-local light = class()
+local light = {}
+light.__index = light
 
-function light:init(x, y, r, g, b, range)
-	self.direction = 0
-	self.angle = math.pi * 2.0
-	self.x = x or 0
-	self.y = y or 0
-	self.z = 1
-	self.red = r or 255
-	self.green = g or 255
-	self.blue = b or 255
-	self.range = range or 300
-	self.smooth = 1.0
-	self.glowSize = 0.1
-	self.glowStrength = 0.0
-	self.visible = true
-  self.is_on_screen = true
+local function new(x, y, r, g, b, range)
+  local obj = {
+    direction = 0,
+    angle = math.pi * 2.0,
+    x = x or 0,
+    y = y or 0,
+    z = 1,
+    red = r or 255,
+    green = g or 255,
+    blue = b or 255,
+    range = range or 300,
+    smooth = 1.0,
+    glowSize = 0.1,
+    glowStrength = 0.0,
+    visible = true,
+    is_on_screen = true,
+  }
+
+  return setmetatable(obj, light)
 end
 
 -- set position
@@ -118,4 +122,4 @@ function light:setVisible(visible)
   self.visible = visible
 end
 
-return light
+return setmetatable({new = new}, {__call = function(_, ...) return new(...) end})

lib/normal_map.lua

@@ -1,4 +1,4 @@
-normal_map = {}
+local normal_map = {}
 
 function normal_map.fromHeightMap(heightMap, strength)
 	local imgData = heightMap:getData()

lib/postshader.lua

@@ -22,10 +22,10 @@ OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 SOFTWARE.
 ]]
 local _PACKAGE = (...):match("^(.+)[%./][^%./]+") or ""
-local class = require(_PACKAGE..'/class')
 local util = require(_PACKAGE..'/util')
 
-local post_shader = class()
+local post_shader = {}
+post_shader.__index = post_shader
 
 local files = love.filesystem.getDirectoryItems(_PACKAGE.."/shaders/postshaders")
 local shaders = {}
@@ -44,18 +44,16 @@ for i,v in ipairs(files) do
   end
 end
 
-function post_shader:init()
-  self:refreshScreenSize()
-  self.effects = {}
+local function new()
+  local obj = {effects = {}}
+  local class = setmetatable(obj, post_shader)
+  class:refreshScreenSize()
+  return class
 end
 
 function post_shader:refreshScreenSize(w, h)
   w, h = w or love.window.getWidth(), h or love.window.getHeight()
-
   self.back_buffer   = love.graphics.newCanvas(w, h)
-
-  self.w = w
-  self.h = h
 end
 
 function post_shader:addEffect(shaderName, ...)
@@ -116,7 +114,6 @@ function post_shader:drawTiltShift(canvas, args)
 end
 
 function post_shader:drawShader(shaderName, canvas, args)
-  local w, h = love.graphics.getWidth(), love.graphics.getHeight()
   local current_arg = 1
 
   local effect = shaders[shaderName]
@@ -164,4 +161,4 @@ function process_palette(palette)
   return palette
 end
 
-return post_shader
+return setmetatable({new = new}, {__call = function(_, ...) return new(...) end})