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-- override playerFilter function
local playerFilter = function(item, other)
	
local kind

	-- if the object of the collision has a properties table 
	-- (ie. it's been exported from Tiled with the collidable custom property)
	if other.properties ~= nil then
		kind = other.properties -- store a reference to the properties table to use with the filter
	else
		kind = other.name -- else store a reference to the object's name since it has no properties table 
					    -- (useful as we can set the 'name' manually or grab it from the object exported by Tiled)
	end
	
	if kind.collidable then -- if object.properties table has the collidable element
		return 'slide'
	elseif kind == 'spring' then -- if object.name is spring
		return 'bounce'
	elseif kind == 'hotspot' then -- if object.name is hotspot
		return 'cross'
	end
end -- end of playerFilter function

-- actually move the player, obeying collisons
player.x, player.y, cols, len = world:move(player, player.x, player.y, playerFilter)