#################################################################
# Developed by Danilo Cesar [http://www.danilocesar.com]
# Inspired on:  http://www.bigbold.com/snippets/posts/show/636
#################################################################

from appuifw import *
from graphics import Image
import camera, e32

app.body = c = Canvas()

running = 1
def quit():
    global running
    running = 0

app.exit_key_handler=quit
app.title = u"O controle"
app.screen = 'full'   # or 'normal', 'large'

def getdata(im, bpp=24):
    import struct, zlib
    im.save('D:\\pixels.png', bpp=bpp, compression='no')
    f = open('D:\\pixels.png', 'rb')
    f.seek(8 +8+13+4)
    chunk = []
    while 1:
        n = struct.unpack('>L', f.read(4))[0]
        if n==0: break  # 'IEND' chunk
        f.read(4) # 'IDAT'
        chunk.append(f.read(n))
        f.read(4)   # CRC
    f.close()
    return zlib.decompress(''.join(chunk))  # '\x00' prefix each line


X = 80
Y = 60
while running:
    if X < 0: X = 0
    if Y< 0: Y = 0
    if X > 160 - 30: X = 160 - 30
    if Y > 120 - 30: Y = 120-30
    im = camera.take_photo('RGB', (160,120))
    im.rectangle([(X,Y),(X+30,Y+30)], 0xff0000)   # red outline
    # check hot spot whether active
    box = Image.new((30,30), 'L')  # gray scale
    box.blit(im, (X,Y,X+30,Y+30))
    data = getdata(box, 8)

    # check black
    for i in range(len(data)):
        if ord(data[i]) < 30 and ord(data[i]) > 0:
            X += i%31 - 15
            Y += int(i/31) - 15
            break

    c.blit(im, (0,0), (8,12))   # show camera