PyQtGraph - 获取绘图窗口的像素大小

在本文中，我们将看到如何在 PyQtGraph 模块中获取绘图窗口的像素大小。 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）。绘图窗口包括两个主要部分：包含实际绘制图形的绘图面板和控制面板。像素，缩写为“px”，也是图形和网页设计中常用的度量单位，大约相当于 1⁄96 英寸（0.26 ）。此测量用于确保给定元素无论以何种屏幕分辨率查看，都将显示为相同的大小。

我们可以在下面给出的命令的帮助下创建一个绘图窗口

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

In order to do this we use pixelSize method with the plot window object

Syntax : window.pixelSize()

Argument : It takes no argument

Return : It returns Point object

下面是实现

# 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()
  
# title
title = "GeeksforGeeks PyQtGraph"
  
  
  
# setting window title
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
bargraph1 = pg.BarGraphItem(x = x, height = y1, width = 0.6, brush ='g')
  
# add item to plot window
# adding bargraph item to the window
window.addItem(bargraph1)
  
# getting plot item
value = window.pixelSize()
  
# printing the value
print("Pixel Size : ", end ="")
print(value)
  
window.enableMouse(True)
      
# 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 ：

Pixel Size : Point(1.000000, 1.000000)