[英]Difficulty with annotate function in Python 2
我正在尝试通过串行端口从arduino
绘制Python上的实时数据。
我发现使用注释功能存在一些困难:我不知道如何配置它,或者我放置注释功能的位置是否正确。
import serial
import time
import numpy
import matplotlib.pyplot as plt
from drawnow import *
temperature= []
vitesse= []
charge= []
current= []
Time = []
cnt=0
# Create our serial object
arduinoData = serial.Serial('com5', 9600)
# Turn on matplotlib interactive mode to plot live data
plt.ion()
##fig1 = plt.figure()
STARTINGTIME = round(time.time(),2)
# A function that makes our desired plot
def makeFig():
plt.subplot(2,2,1)
plt.subplot(2,2,1).annotate(str(temperature)+','+ str(Time),
textcoords='offset points')
plt.title('Live Streaming Temperature Sensor Data')
plt.ylabel('Temperature C')
plt.grid(True)
plt.plot(temperature, 'ro-')
plt.subplot(2,2,2)
plt.subplot(2,2,2).annotate(str(vitesse)+','+ str(Time),
textcoords='offset points')
plt.title('Live Streaming Speed Sensor Data')
plt.ylabel('Speed KM/H')
plt.grid(True)
plt.plot(vitesse, 'bo-')
plt.subplot(2,2,3)
plt.subplot(2,2,3).annotate(str(charge)+','+ str(Time),
textcoords='offset points')
plt.title('Live Streaming SOC Sensor Data')
plt.ylabel('Battery Charge %')
plt.grid(True)
plt.plot(charge, 'go-')
plt.subplot(2,2,4)
plt.subplot(2,2,4).annotate(str(current)+','+ str(Time),
textcoords='offset points')
plt.title('Live Streaming Current Sensor Data')
plt.ylabel('Current A')
plt.grid(True)
plt.plot(current, 'yo-')
while True:
while (arduinoData.inWaiting()==0):
# Wait here until there is data
pass
# Read the line of text from the serial port
arduinoString = arduinoData.readline()
# Split it into an array
dataArray = arduinoString.split(';')
temp = float(dataArray[0])
vite = float(dataArray[1])
char = float(dataArray[2])
curr = float(dataArray[3])
# Build our temperature array by appending temperature readings
temperature.append(temp)
# Build our vitesse array by appending temp readings
vitesse.append(vite)
# Build our charge array by appending temp readings
charge.append(char)
# Build our current array by appending temp readings
current.append(curr)
Time.append(round(time.time(),2) - STARTINGTIME)
# Update our live graph
drawnow(makeFig)
plt.pause(0.00001)
cnt += 1
if(cnt > 50):
temperature.pop(0)
vitesse.pop(0)
charge.pop(0)
current.pop(0)
annotate
至少需要两个参数。 第一个是文本,第二个是一个元组,其中包含要文本移动到的坐标。 此外,由于要注释每个点,因此需要在循环内调用annotate
。
这是一个例子:
import matplotlib.pyplot as plt
import numpy as np
Y = np.sin(np.linspace(0, 3, 10))
plt.plot(Y)
for i, y in enumerate(Y):
plt.annotate(str(y), (i, y))
plt.show()
这是循环应在代码中进行的位置:
def makeFig(): #Create a function that makes our desired plot
plt.subplot(2,2,1)
plt.title('Live Streaming Temperature Sensor Data')
plt.ylabel('Temperature C')
plt.grid(True)
plt.plot(temperature, 'ro-')
for i, t in enumerate(temperature):
plt.annotate(str(t), (i, t), textcoords='offset points')
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