LÖVE

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-- Sets the tween value of name to val only if it doesn't already exist. Use together with anim.simple
anim.start( string name, number val )

-- Starts the animation between the current value of name and dest in time seconds, using the equation function.
-- equation can be your own function or an ANIM_* function (check the top of anim.lua)
anim.simple( string name, number dest, number time, function equation, ... )

-- Similar to anim.simple but queues the animation after delay amount of seconds. Optional start value.
anim.queue( string name, number start, number dest, number time, number delay, function equation, ... )

-- Queues a function to run after delay amount of seconds. Passes ... to the function.
anim.callback( string name, number delay, function callback, ... )

-- Returns the current tween value of the animation or default if it doesn't exist.
anim.get( string name, number default )

anim.remove( string name )

anim.removeAll()

anim.exists( string name )

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love.filesystem.require("anim.lua")

function update()
    -- This is required
    anim.updateAll()
end

function mousepressed(x, y, btn)
    -- Transition the current value of 'box_x' to a random position in 2seconds
    -- If the 'box_x' animation doesn't exist yet, it will default to 0px.
    anim.simple("box_x", math.random(400), 2)
end

function draw()
    -- Get the value of 'box_x', if it doesn't exist yet (mousepressed hasn't been called) then 
    -- default to 0. We could change the default value to 200 and it would draw at 200px
    -- until the animation starts.
    local x = anim.get("box_x", 0)

    love.graphics.setColor(255,180,0,255)
    love.graphics.rectangle(love.draw_fill, x, 0, 20, 20)
end

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function draw()
	-- Regular draw stuff.
	
	local alpha = anim.get("overlay_alpha", 0)
	if alpha > 0 then
		love.graphics.setColor(0,0,0,alpha)
		love.graphics.rectangle(love.draw_fill, 0, 0, WIDTH, HEIGHT)
	end
end
function keypressed(key)
	-- Fade to black
	anim.queue("overlay_alpha", 0, 255, 1, 0, ANIM_QUAD_OUT)

	anim.callback("overlay_alpha", 0, function()
		-- Do something to change the contents of your window
	end)

	-- Unfade again
	anim.queue("overlay_alpha", 255, 0, 1, 0, ANIM_QUAD_IN)

	-- Delete this animation. Not necessary but I like to be need.
	anim.callback("overlay_alpha", 0, anim.remove, "overlay_alpha")
end