[Newb Question] Fading images in/out?

[VladiMatt]

Hi there, I'm trying to write a couple functions that lets me fade images in and out, but I can't get it to work.

Code: Select all

function fadeGraphicIn(graphic, fadetime, _x, _y, scale)
	local fade = fadetime
	local alphachange = 255 / fadetime * 0.1
	local alpha = 0
	while fade > 0 do
		love.timer.sleep( 0.1 )
		fade = fadetime - 0.1
		love.graphics.setColor(255, 255, 255, alpha )
		love.graphics.draw(graphic, _x, _y)
		alpha = alpha + alphachange
	end
end

This function is called by love.draw() as the game starts to fade in a .PNG image that says "Made with LOVE", but the game completely locks up. If anyone knows what I'm doing wrong, I'd really appreciate any help they could offer. Once I've got this function working I'll be able to make the fadeout function easily.

Thanks in advance!

[adnzzzzZ]

The game locks up because you're telling it to sleep for 0.1s every frame (multiple times, since it's also inside a while loop). love.draw is called every frame, so your function is getting called every frame and your function, on top of sleeping everything, is drawing the image multiple times per frame and doing the whole fading logic in one frame, not along the fadetime. You're also forgetting to use setColorMode so that the current color affects your drawn images.

To get fading (out) working properly I'd do something like this:

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function love.load()
  fade_time = 5
  fade_timer = 5
  love.graphics.setColorMode('modulate')
  image = love.graphics.newImage()
end

function love.update(dt)
  if fade_timer > 0 then fade_timer = fade_timer - dt end
end

function love.draw()
  love.graphics.setColor(255, 255, 255, fade_timer*(255/fade_time))
  love.graphics.draw(image, )
end

[VladiMatt]

While your example didn't work the way I needed it to, I fixed what you pointed out (I've gotta say I'm a bit embarrassed I didn't realize it from the start, haha!) and got it working (for the most part)! Thanks a billion!

[Zeliarden]

The game locks up because you're telling it to sleep for 0.1s every frame (multiple times, since it's also inside a while loop).

The game locks up because of an infite while loop

Code: Select all

      fade = fadetime - 0.1 

should be

Code: Select all

      fade = fade - 0.1 

for the while loop to go through

You're also forgetting to use setColorMode so that the current color affects your drawn images.

setColorMode is set to 'modulate' by default so its not needed to be set

[DarthGrover]

how can fading be done in 0.9.0? since it seems setColorMode is gone.

[Ranguna259]

Use love.graphics.setColor() before the image and decrease the alpha overtime