PyQt5 QSpinBox – 将像素比率作为浮点值

在本文中，我们将看到如何在浮点值中获取旋转框的像素比例，设备像素比例是旋转框的物理像素与逻辑像素的比例。普通值是 1 用于正常 dpi 显示器，2 用于高 dpi “视网膜”显示器。我们可以使用devicePixelRatio方法来获取像素比率，但它不是浮点值。

In order to do this we use devicePixelRatioF method

Syntax : spin_box.devicePixelRatioF()

Argument : It takes no argument

Return : It returns float

编程需要懂一点英语

下面是实现

# importing libraries
from PyQt5.QtWidgets import * 
from PyQt5 import QtCore, QtGui
from PyQt5.QtGui import * 
from PyQt5.QtCore import * 
import sys
  
  
class Window(QMainWindow):
  
    def __init__(self):
        super().__init__()
  
        # setting title
        self.setWindowTitle("Python ")
  
        # setting geometry
        self.setGeometry(100, 100, 600, 400)
  
        # calling method
        self.UiComponents()
  
        # showing all the widgets
        self.show()
  
        # method for widgets
    def UiComponents(self):
        # creating spin box
        self.spin = QSpinBox(self)
  
        # setting geometry to spin box
        self.spin.setGeometry(100, 100, 250, 40)
  
        # setting range to the spin box
        self.spin.setRange(0, 999999)
  
        # setting prefix to spin
        self.spin.setPrefix("Prefix ")
  
        # setting suffix to spin
        self.spin.setSuffix(" Suffix")
  
        # getting pixel ratio in floating value
        pixel_ratio = self.spin.devicePixelRatioF()
  
        # creating label
        label = QLabel(self)
  
        # setting geometry to the label
        label.setGeometry(100, 200, 200, 70)
  
        # making it multi line label
        label.setWordWrap(True)
  
        # setting text to the label
        label.setText("Pixel Ratio(float) : " + str(pixel_ratio))
  
# create pyqt5 app
App = QApplication(sys.argv)
  
# create the instance of our Window
window = Window()
window.spin.setFocus()
# start the app
sys.exit(App.exec())

输出：