LÖVE

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t_start = love.timer.getTime()
-- draw here
t_end = love.timer.getTime()
t_used = t_end - t_start

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-- Init:
scene.add_child(sprite)
-- Update:
sprite:move() -- Or similar

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-- initialize
function main ( )
	object_list = { }

	paused = false
	moving = false
	rotating = false
end

-- enable disable the different test
keyboard.on_press = function ( k )
	if k == KEY_1 then
		paused = not paused
	elseif k == KEY_2 then
		moving = not moving
	elseif k == KEY_3 then
		rotating = not rotating
	end
end

-- update
game.on_update = function ( )
	-- clock time between updates
	window.title = "objects:" .. #object_list .. " fps:" .. game:get_fps ( ) .. " delta:" .. game:get_delta ( )
	local delta = game:get_delta ( )

	-- do not iterate if paused
	if paused == false then
		for k,v in ipairs ( object_list ) do

			-- motion
			if moving == true then
				v.position.x = v.position.x + v.inc_x * delta
				v.position.y = v.position.y + v.inc_y * delta
				
				if v.position.x < 0 - 400 or v.position.x > 800 - 400 then
					v.inc_x = -v.inc_x
				end
				
				if v.position.y < 0 - 300 or v.position.y > 600 - 300 then
					v.inc_y = -v.inc_y
				end
			end

			-- rotation
			if rotating == true then
				v.rotation = v.rotation + v.inc_rot * delta
			end
		end
	end

	-- create 5 new objects
	if keyboard:is_down ( KEY_UP ) then
		for i = 0, 5 do
			local s = Sprite ( math.random ( 0, 800 ) - 400, math.random ( 0, 600 ) - 300 )

			-- size
			s.w = math.random ( 10, 20 )
			s.h = math.random ( 10, 20 )

			-- create object
			s.canvas:rectangle ( s.w, s.h )
			s.canvas:set_fill_style ( Color(255,0,0), 1 )
			s.canvas:fill ( )
			scene:add_child ( s )

			-- motion
			s.inc_x = math.random ( -100,100 ) / 100
			s.inc_y = math.random ( 100,100 ) / 100

			-- rotation
			s.inc_rot = math.random ( -5, 5 )

			table.insert ( object_list, s )
		end
	end

	-- release 5 existing objects
	if keyboard:is_down ( KEY_DOWN ) then
		local diff = 5
		if #object_list < diff then
			diff = #object_list - 1
		end
		for i = 0, diff do
			local s = table.remove ( object_list )
			scene:remove_child ( s )
		end 
	end
end