import serial

def getWin():
    ser = serial.Serial('/dev/ttyUSB0', 9600)
    ser.write('OW;')
    s=[]
    if not s:
        print 'Datei Fehler' 
    while True:
        x=ser.read()
        if x == "\x0d":
            break
        s.append(x)
    return tuple(int(x) for x in "".join(s).split(","))

def parse(filename):
    with open(filename) as file:
        contents = file.read()
    commands = []
    for command in contents.split(";"):
        name, args = command[:2], command[2:]
        args = [int(arg) for arg in args.split(",")] if args else []
        commands.append((name, args))
    return commands

def compile(commands):
    return ";".join(name + ",".join(str(arg) for arg in args)
                                    for name, args in commands)

def scale(commands, factor):
        for name,args in commands:
            if name in ("PU","PD","PA","PR"):
                for i in range(len(args)):
                    args[i] = int(args[i]*factor)
        return commands

def left(commands, left):
        for name,args in commands:
            if name in ("PU","PD","PA","PR"):
                    if len(args):
                        args[1] +=left
        return commands

def up(commands, up):
        for name,args in commands:
            if name in ("PU","PD","PA","PR"):
                    if len(args):
                        args[0] +=up
        return commands

    
def oob(commands):
    xmin, ymin, xmax, ymax = getWin()
    for name,args in commands:
            if name in ("PU","PD","PA","PR"):
                if xmin < args[0] <xmax or   ymin < args[1] < ymax:
                    return False
                else:
                    return False

def center(command):
    xmin, ymin, xmax, ymax = getWin()
    maxx = maxy = minx = miny = 0
    for name,args in command:
        if len(args)>1:
                if args[0] > maxx:
                    maxx = args[0]
                if args[0] < minx:
                    minx = args[0]
                if args[1] < miny:
                    miny = args[1]
                if args[1] > maxy:
                    maxy =args[1]
    xcent= int((xmax-xmin)/2)
    ycent= int((ymax-ymin)/2)
    centy= int((maxy-miny)/2)
    centx= int((maxx-minx)/2)
    return up(left(command,centy-ycent),centx-xcent)
        
            

out = center(scale(parse("vishnu.hpgl"),2.5))
print out
print'test'
print oob(out)


#    print name, args
ser = serial.Serial('/dev/ttyUSB0', 9600)
if not oob(out):
    ser.write(compile(out))