class.lua

--[[
		Simple Class Implementation for Lua using Metetables.
		This is very clean and simple, sticking to some very
		simple principles.
		
		Static methods defined with . (dot) and instance methods
		with : (semicolon) .
		
		Default values declared when defining the initial table.
		The .new static method implements the constructor which
		sets the metatable and do other chores as necessary.
		
		The metatable is self-contained and its index points to the
		initial table.
--]]
Entity = 
{
	name="Default",
	x=0,
	y=0
};
Entity.metatable = { __index = Entity };
Entity.new = function(name)
	local self = {}
	setmetatable(self, Entity.metatable);	
	
	if name ~= nil then	 self:setName(name); end

	return self;
end
function Entity:setName(name)
	self.name = name;
end
function Entity:move(x,y)
	self.x = x;
	self.y = y;
end
function Entity:speak()
	print(string.format("Hey, I am %s sitting over here %d, %d ...", self.name, self.x, self.y));
end

e = Entity.new('Orc');
e:move(10,10);
e:speak();

e2 = Entity.new('Player');
e2:move(15,10);
e2:speak();

e3 = Entity.new();
e3:speak();
e3:setName('Zombie');
e3:move(20,25);
e3:speak();