[Author Prev][Author Next][Thread Prev][Thread Next][Author Index][Thread Index]

Re: [pygame] Directly accessing pixel data

B. Bogart wrote:

Alex Holkner wrote:



Using surfarray.pixels2d will give you a Numeric array overlayed over
the buffer, you can extract the buffer pointer with a little ctypes
hackery (see array.py in pygame-ctypes).



Hi Alex,

The updated docs on the pygame website say that numarray is compatible
with surfarray, but blit_array does not accept a numarray argument. Is
only numeric supported?


The docs you are looking at are for Pygame-ctypes. Standard Pygame accepts only Numeric arrays (though I vaguely remember a patch floating around a while back for numpy).

Here is the original message:

Hey all,

So I'm just looking for a good way to get pixel access to images in python.

Seems surfarray is a great option. The manual states that I can use
numarray,numpy or numeric:

"Any type of array (numpy, numarray or Numeric) can be used as the input
to any function regardless of the array module set."
(from http://www.pygame.org/ctypes/pygame-api/pygame.surfarray-module.html)

I have chosen numarray and I suppose will eventually change to numpy.


Even within Pygame-ctypes, numarray is not supported completely: I'd recommend using numpy if possible.

but it seems I am actually not allowed to pass a numarray to a surfarray
function:



type(image)


<class 'numarray.numarraycore.NumArray'>


pygame.surfarray.blit_array(mysurface, image)


Traceback (most recent call last):
File "<stdin>", line 1, in ?
TypeError: argument 2 must be array, not NumArray


It looks like there is no random_array module in numeric nor numpy,
just numarray.


See numpy.random.
Alex.