Added Switch functionality.

switch.lua

@@ -0,0 +1,62 @@
+-- Switch
+
+-- Represents a switch object
+
+Switch = {visible = true, state = "off"}
+
+switch_off_img = love.graphics.newImage("img/switch_off.png")
+switch_on_img = love.graphics.newImage("img/switch_on.png")
+
+function Switch:new(o)
+  o = o or {}
+  setmetatable(o, self)
+  self.__index = self
+  return o
+end
+
+function Switch:with(position, tag, tiles, world)
+  self.body = love.physics.newBody(world.physics, position.x*32, position.y*32, 0, 0)
+  self.shape = love.physics.newRectangleShape(self.body, -16, -16, 32, 32, 0)
+  self.tag = tag
+  self.tiles = tiles
+  self.shape:setFriction(1.0)
+  self.shape:setSensor(true)
+  self.type = "switch"
+  self.shape:setData(self)
+
+  return self
+end
+
+function Switch:is_collided_with_player(player)
+  local r = player:getX()
+  local b = player:getY() - 1
+  local l = r - 32
+  local t = b - 30
+
+  return self.shape:testPoint(r,b) or self.shape:testPoint(r,t) or self.shape:testPoint(l,b) or self.shape:testPoint(l,t)
+end
+
+function Switch:toggle()
+  if self.state == "off" then
+    self.state = "on"
+  else
+    self.state = "off"
+  end
+  for i=1,#self.tiles do
+    self.tiles[i].obj.visible = not self.tiles[i].obj.visible
+  end
+end
+
+function Switch:draw(x, y)
+  if self.visible == false then
+    return
+  end
+
+  local x1,y1,x2,y2 = self.shape:getPoints()
+
+  if self.state == "off" then
+    love.graphics.draw(switch_off_img, x1-x, y1-y)
+  else
+    love.graphics.draw(switch_on_img, x1-x, y1-y)
+  end
+end