X_SIZE = 600
Y_SIZE = 600
STEP = 10
FEEDRATE = 3600

FILENAME = "wearin.gcode"

MOVE_COMMAND = "G0 F{}".format(FEEDRATE) + " X{x} Y{y}\n"


def next_move(travel_length, step_length, step_size):
    next_travel = travel_length
    yield (next_travel, 0)

    for step in xrange(step_size, step_length+step_size, step_size):
        yield (next_travel, step)
        if next_travel == 0:
            next_travel = travel_length
        else:
            next_travel = 0
        yield (next_travel, step)

with open(FILENAME, "w") as output:
    for x, y in next_move(X_SIZE, Y_SIZE, STEP):
        output.write(MOVE_COMMAND.format(x=x, y=y))

    output.write(MOVE_COMMAND.format(x=0, y=0))

    for y, x in next_move(Y_SIZE, X_SIZE, STEP):
        output.write(MOVE_COMMAND.format(x=x, y=y))

    output.write(MOVE_COMMAND.format(x=0, y=0))