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#!/usr/bin/env python

import os
    import pygame
    # Use numeric, not numpy here (otherwise, follow the NUMPY comments)
    # NUMPY: import numpy as N
    import Numeric as N
    from pygame.locals import *
    surfarray = pygame.surfarray
    if not surfarray: raise ImportError
except ImportError:
    raise ImportError, 'Error Importing Pygame/surfarray or Numeric'

print 'Press the mouse button to advance image.'
print 'Press the "s" key to save the current image.'

# Guarantee the usage of Numeric
pygame.surfarray.use_array ("numeric")
# NUMPY: pygame.surfarray.use_array ("numpy")

def surfdemo_show(array_img, name):
    "displays a surface, waits for user to continue"
    screen = pygame.display.set_mode(array_img.shape[:2], 0, 32)
    surfarray.blit_array(screen, array_img)
    while 1:
        e = pygame.event.wait()
        if e.type == MOUSEBUTTONDOWN: break
        elif e.type == KEYDOWN and e.key == K_s:
  , name+'.bmp')
            #s = pygame.Surface(screen.get_size(), 0, 32)
            #s = s.convert_alpha()
            #s.blit(screen, (0,0))
            #s.fill((222,0,0,50), (0,0,40,40))
            #pygame.image.save_extended(s, name+'.png')
  , name+'.png')
  , name+'_screen.png')
  , name+'.tga')
  , name+'.png')
        elif e.type == QUIT:
            raise SystemExit

allblack = N.zeros((128, 128))
surfdemo_show(allblack, 'allblack')

striped = N.zeros((128, 128, 3))
striped[:] = (255, 0, 0)
striped[:,::3] = (0, 255, 255)
surfdemo_show(striped, 'striped')

imagename = os.path.join('data', 'arraydemo.bmp')
imgsurface = pygame.image.load(imagename)
imgarray = surfarray.array2d(imgsurface)
surfdemo_show(imgarray, 'imgarray')

flipped = imgarray[:,::-1]
surfdemo_show(flipped, 'flipped')

scaledown = imgarray[::2,::2]
surfdemo_show(scaledown, 'scaledown')

size = N.array(imgarray.shape)*2
scaleup = N.zeros(size)
scaleup[::2,::2] = imgarray
scaleup[1::2,::2] = imgarray
scaleup[:,1::2] = scaleup[:,::2]
surfdemo_show(scaleup, 'scaleup')

rgbarray = surfarray.array3d(imgsurface)
redimg = N.array(rgbarray)
redimg[:,:,1:] = 0
surfdemo_show(redimg, 'redimg')

soften = N.array(rgbarray)*1
soften[1:,:]  += rgbarray[:-1,:]*8
soften[:-1,:] += rgbarray[1:,:]*8
soften[:,1:]  += rgbarray[:,:-1]*8
soften[:,:-1] += rgbarray[:,1:]*8
soften /= 33
surfdemo_show(soften, 'soften')

#crossfade (50%)
src = N.array(rgbarray)
dest = N.zeros(rgbarray.shape)
dest[:] = 20, 50, 100
diff = (dest - src) * 0.50
# NUMPY: xfade = src + diff.astype(N.uint)
xfade = src + diff.astype(N.Int)
surfdemo_show(xfade, 'xfade')

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