1  
   2  
   3  #################################################################
   4  # Developed by Danilo Cesar [http://www.danilocesar.com]
   5  # Inspired on:  http://www.bigbold.com/snippets/posts/show/636
   6  #################################################################
   7  
   8  from appuifw import *
   9  from graphics import Image
  10  import camera, e32
  11  
  12  app.body = c = Canvas()
  13  
  14  running = 1
  15  def quit():
  16      global running
  17      running = 0
  18  
  19  app.exit_key_handler=quit
  20  app.title = u"O controle"
  21  app.screen = 'full'   # or 'normal', 'large'
  22  
  23  def getdata(im, bpp=24):
  24      import struct, zlib
  25      im.save('D:\\pixels.png', bpp=bpp, compression='no')
  26      f = open('D:\\pixels.png', 'rb')
  27      f.seek(8 +8+13+4)
  28      chunk = []
  29      while 1:
  30          n = struct.unpack('>L', f.read(4))[0]
  31          if n==0: break  # 'IEND' chunk
  32          f.read(4) # 'IDAT'
  33          chunk.append(f.read(n))
  34          f.read(4)   # CRC
  35      f.close()
  36      return zlib.decompress(''.join(chunk))  # '\x00' prefix each line
  37  
  38  
  39  X = 80
  40  Y = 60
  41  while running:
  42      if X < 0: X = 0
  43      if Y< 0: Y = 0
  44      if X > 160 - 30: X = 160 - 30
  45      if Y > 120 - 30: Y = 120-30
  46      im = camera.take_photo('RGB', (160,120))
  47      im.rectangle([(X,Y),(X+30,Y+30)], 0xff0000)   # red outline
  48      # check hot spot whether active
  49      box = Image.new((30,30), 'L')  # gray scale
  50      box.blit(im, (X,Y,X+30,Y+30))
  51      data = getdata(box, 8)
  52  
  53      # check black
  54      for i in range(len(data)):
  55          if ord(data[i]) < 30 and ord(data[i]) > 0:
  56              X += i%31 - 15
  57              Y += int(i/31) - 15
  58              break
  59  
  60      c.blit(im, (0,0), (8,12))   # show camera
  61   
  62  
  63