I am fairl amateur to programming, but I’m trying to create a python widget that can display the selected photoperiod for a controlled environment growhouse, based on the current time. A GUI would contain this widget so I can know the programmed light hours remotely.
I’m in the early stages of making this and have hit a wall trying to set the time format for the axis.
As you can see in the image, I want to plot the current time against a set time line, with set tickers/intervals.
Any suggestions on improvement are welcome, it’s very early days for my Python journey so simple and constructive help or guides appreciated please 🙂
This is the concept:
(https://i.sstatic.net/x0Z4vsiI.png)
This is my current code:
import matplotlib.pyplot as plt
import matplotlib.dates as md
import datetime
import numpy as np
import matplotlib.ticker as plticker
#Creating an object for the current date and time
timenowfull = datetime.datetime.now()
#converting current time to hh:mm
timenowMMHH = (timenowfull.strftime("%H:%M"))
#testing the current time converted readout
print(timenowMMHH)
dataY = np.array([0.5])
dataX = np.array([timenowMMHH])
plt.ylim(0, 1)
plt.locator_params(axis='y', nbins=1)
#creates the scatter plot with a line as a marker
plt.scatter(dataX,dataY,marker="|",s=100000)
And this is the current output:
(https://i.sstatic.net/2fNDiVEM.png)
>Solution :
the necessary changes to make on your code using matplotlib.dates to format the x-axis for hh:mm:
import matplotlib.pyplot as plt
import matplotlib.dates as mdates
import datetime as dt
import numpy as np
now = dt.datetime.now()
x = [now]
y = [0.5]
fig, ax = plt.subplots()
ax.scatter(x, y, marker="|", s=100000)
ax.xaxis.set_major_locator(mdates.HourLocator(interval=1))
ax.xaxis.set_minor_locator(mdates.MinuteLocator(interval=30))
ax.xaxis.set_major_formatter(mdates.DateFormatter('%H:%M'))
ax.set_xlim(now.replace(hour=0, minute=0), now.replace(hour=23, minute=59))
plt.ylim(0, 1)
plt.xticks(rotation=45)
plt.show()