tidyhooker9418 | 2021-01-08 20:27:47 UTC | #1
https://www.pythonguis.com/tutorials/plotting-pyqtgraph/
Is there a way to change the tics in a line graph to dates or names of months?
martin | 2021-01-14 14:08:56 UTC | #2
Hey, here you go.
from PyQt5 import QtWidgets
from pyqtgraph import PlotWidget, plot
import pyqtgraph as pg
import sys # We need sys so that we can pass argv to QApplication
import os
import datetime
class MainWindow(QtWidgets.QMainWindow):
def __init__(self, *args, **kwargs):
super().__init__(*args, **kwargs)
self.graphWidget = pg.PlotWidget()
self.setCentralWidget(self.graphWidget)
months = [1,2,3,4,5,6,7,8,9,10]
temperature = [30,32,34,32,33,31,29,32,35,45]
self.graphWidget.setBackground('w')
pen = pg.mkPen(color=(255, 0, 0))
month_labels = [
# Generate a list of tuples (x_value, x_label)
(m, datetime.date(2020, m, 1).strftime('%B'))
for m in months
]
self.graphWidget.plot(months, temperature, pen=pen, labels=month_labels)
ax=self.graphWidget.getAxis('bottom')
# Pass the list in, *in* a list.
ax.setTicks([month_labels])
def main():
app = QtWidgets.QApplication(sys.argv)
main = MainWindow()
main.show()
sys.exit(app.exec_())
if __name__ == '__main__':
main()
The trick is the labels need to be a list of 2-tuples containing the tick value (x value) and the label for that tick. In the example above we're using month numbers 1-10 for the x-axis, so the month labels becomes [(1, "January"), (2, "February"), (3, "March") ... etc]
To set the labels you need to get the axis object, and then use .setTicks() ...since this can be used to set ticks for both axes, you need to pass it in in a list i.e. [month_labels] where month_labels is our list of tick labels.
Also available from Leanpub and Amazon Paperback
Purchasing Power Parity
Developers in [[ country ]] get [[ discount.discount_pc ]]% OFF on all books & courses with code [[ discount.coupon_code ]]The result is ...
PyQt/PySide 1:1 Coaching with Martin Fitzpatrick — Get one on one help with your Python GUI projects. Working together with you I'll identify issues and suggest fixes, from bugs and usability to architecture and maintainability.
Hope that helps?
Packaging Python Applications with PyInstaller by Martin Fitzpatrick — This step-by-step guide walks you through packaging your own Python applications from simple examples to complete installers and signed executables.
