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import select
import socket
from urllib.parse import urlparse
import re
import numpy as np
from numpy_ringbuffer import RingBuffer
import dearpygui.dearpygui as dpg
class udpsource:
"""
Creates an UDP listening socket
"""
def __init__(self, url, dtype):
self.sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
self.url = urlparse(url)
self.dtype = dtype
def __del__(self):
self.sock.close()
def bind(self):
self.sock.setblocking(False)
self.sock.bind((self.url.hostname, self.url.port))
# self.sock.listen()
def read(self, nblocks):
ready, _, _ = select.select([self.sock], [], [])
if not ready:
return None
# read from socket
blocksize = 1024 * 4
string = ready[0].recv(nblocks * blocksize).decode("ascii")
# decode string, remove empty values
chunks = filter(None, re.split(r"\[(.+?)\]", string))
def chunk_to_samples(chunk):
samples = chunk.split(",")
if samples:
return list(map(self.dtype, samples))
# convert each chunk into a list of samples
chunk_values = map(chunk_to_samples, chunks)
# flatten list of lists into a single list
values = sum(chunk_values, [])
return values
class network_plot(udpsource):
def __init__(self, url, dtype, nsamples, **kwargs):
udpsource.__init__(self, url, dtype)
# create buffers for x and y values
self.nsamples = nsamples
self.xvalues = np.arange(0, self.nsamples)
self.yvalues = RingBuffer(capacity=self.nsamples, dtype=np.dtype(dtype))
self.yvalues.extend(np.zeros(self.nsamples))
# create a plot
self.plot = dpg.plot(**kwargs)
self.bind()
# Map `with' expressions to the underlying plot
def __enter__(self):
return self.plot.__enter__()
def __exit__(self, t, val, tb):
self.plot.__exit__(t, val, tb)
@property
def xdata(self):
return self.xvalues
@property
def ydata(self):
return np.array(self.yvalues)
def refresh_series(self, tag):
new_values = self.read(1)
if new_values:
self.yvalues.extendleft(new_values)
dpg.set_value(tag, [self.xdata, self.ydata])
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