PyQtGraph - 获取条形图的位置

在本文中，我们将看到如何在 PyQtGraph 模块中获取条形图的位置。 PyQtGraph 是一个用于Python的图形和用户界面库，它提供了设计和科学应用程序中通常需要的功能。它的主要目标是提供用于显示数据（绘图、视频等）的快速交互式图形，其次是提供帮助快速应用程序开发的工具（例如，Qt Designer 中使用的属性树）。条形图或条形图是一种图表或图形，它用矩形条显示分类数据，矩形条的高度或长度与其所代表的值成正比。条形可以垂直或水平绘制。垂直条形图有时也称为柱形图。条形图的默认位置是 0, 0 即它从原点开始，尽管我们可以在 setPos 方法的帮助下随时更改此位置。
我们可以在下面给出的命令的帮助下创建一个绘图窗口和条形图

# creating a pyqtgraph plot window
window = pg.plot()

# creating a bar graph of green color
bargraph = pg.BarGraphItem(x=x, height=y1, width=0.6, brush='g')

In order to do this we use pos method with the bar graph object
Syntax : bargraph.pos()
Argument : It takes no argument
Return : It returns QPoint object 
 

下面是实现

Python3

# importing QtGui to use QIcon
from PyQt5.QtGui import * from PyQt5.QtCore import Qt
 
# importing pyqtgraph as pg
import pyqtgraph as pg
 
# importing QtCore and QtGui from the pyqtgraph module
from pyqtgraph.Qt import QtCore, QtGui
 
# importing numpy as np
import numpy as np
 
import time
 
# creating a pyqtgraph plot window
window = pg.plot()
 
# icon for plot window
icon = QIcon("logo.png")
 
# setting icon to the plot window
window.setWindowIcon(icon)
 
# setting window geometry
# left = 100, top = 100
# width = 600, height = 500
window.setGeometry(100, 100, 600, 500)
 
# title for the plot window
title = "GeeksforGeeks PyQtGraph"
 
# setting window title to plot window
window.setWindowTitle(title)
 
# create list for y-axis
y1 = [5, 5, 7, 10, 3, 8, 9, 1, 6, 2]
 
# create horizontal list i.e x-axis
x = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
 
# create pyqt5graph bar graph item
# with width = 0.6
# with bar colors = green
bargraph = pg.BarGraphItem(x = x, height = y1, width = 0.6, brush ='g')
 
# add item to plot window
# adding bargraph item to the window
window.addItem(bargraph)
 
# setting position of the bar graph
bargraph.setPos(500, 200)
   
# getting position of the bar graph
value = bargraph.pos()
 
# printing the value
print("Bar Graph Position : " + str(value))
 
 
# main method
if __name__ == '__main__':
     
    # importing system
    import sys
     
    # Start Qt event loop unless running in interactive mode or using
    if (sys.flags.interactive != 1) or not hasattr(QtCore, 'PYQT_VERSION'):
        QtGui.QApplication.instance().exec_()

输出 ：

Bar Graph Position : Point(500.000000, 200.000000)