streaming line python

index.py

from lightning import Lightning
import numpy as np
import time
from random import randint, random

lgn = Lightning()
session = lgn.create_session()

NUM_LINES = 2
NUM_INITIAL_POINTS = 10


series = [[random() for j in xrange(NUM_INITIAL_POINTS)] for i in xrange(NUM_LINES)]
print series
x = range(NUM_INITIAL_POINTS)

# full manual control
#
viz_full_control = lgn.line(series, index=x)

session.open()

while True:
    new_points = [[] for i in xrange(NUM_LINES)]

    # choose a line to add the new point to...
    line_index = randint(0, NUM_LINES-1)

    for i in xrange(len(new_points)):
        if i == line_index:
            # add a new random point to one of the lines
            new_points[i].append(random())
        else:
            # re-use the last value if there is nothing new
            new_points[i].append(series[i][-1])


    # update the x-axis values
    x.append(x[-1] + random())

    for i in xrange(len(series)):
        for j in xrange(len(new_points[i])):
            series[i].append(new_points[i][j])

    viz_full_control.update(series, index=x)
    time.sleep(2)