Draw sprite with variable alpha transparency

General
1

I want the sprite image to fade in/fade out over a background - i’m sure it’s obvious but i cant find how to do it…

More specific - i want to fade from one sprite to a second sprite in the same location, starting at 100% sprite a 0% sprite b and ending with 0% sprite a and 100% sprite b

Is it possible?

Thanks

2

Try that



--# Main
-- test alpha

-- Use this function to perform your initial setup
function setup()
    data = {alpha = 255}
    next = 0
end

-- This function gets called once every frame
function draw()
    -- This sets a dark background color 
    background(40, 40, 50)
    fontSize(50)
    text("touch me",WIDTH/2,HEIGHT/8)
    scale(4)
    tint(255,255,255,data.alpha)
    sprite("Planet Cute:Character Boy",WIDTH/8,HEIGHT/8)
    tint(255,255,255,255-data.alpha)
    sprite("Planet Cute:Character Princess Girl",WIDTH/8,HEIGHT/8)
end

function touched(touch)
    if touch.state == BEGAN then
    tween(1,data,{alpha = next})
    next = 255-next
    end
end
3

Thanks. Knew there had to b a simple way.