Re: [pygame] I can't seem to find any simple sprite animation game examples on the pygame.org site

[Casey Duncan <casey@xxxxxxxxxxx>]

On Sep 11, 2007, at 9:00 PM, Ian Mallett wrote:

> Opps.  That's:
>
> if frame_number%10 == 0: #frame_number is a multiple of ten
>   #draw frame 1
> elif frame_number%9 == 0: #frame_number ends in 9
>   #draw frame 2
[snip lots of elifs]

Or assuming you store the images in a list, e.g.:

images = [image1, image2, image3, image4, image5]

then

this_image = images[frame_number % len(images)]

which works with any arbitrary number of images without code changes  
and is faster and much more concise that a big if/elif block (which  
IMO should be avoided as much as possible).

I also have this handy class for loading lots of images from files  
that I can match with a pattern:

class Animation:

	def __init__(self, file_pattern, colorkey=(0,0,0), alpha=255, fade=0):
		self.images = []
		for path in glob.glob('data/%s' % file_pattern):
			image = pygame.image.load(path).convert()
			image.set_colorkey(colorkey, RLEACCEL)
			image.set_alpha(max(alpha, 0), RLEACCEL)
			alpha -= fade
			self.images.append(image)

Which I use for explosions where I want the alpha to fade to  
transparent as it plays through.

You use it like so:

xplode = Animation('xplode/*.jpg', alpha=180, fade=8)

or to just load it with everything opaque:

anim = Animation('somedir/*.png')

You said you were using sprite sheets though so it may not be that  
helpful to you.

-Casey