使用 PyQt5 创建黄金比例计算器
在本文中，我们将了解如何使用 PyQt5 创建黄金比例计算器。在数学中，如果两个量的比率与它们的总和与两个量中较大者的比率相同，则它们处于黄金比例。黄金比例的值为 1.61803398875。下面是黄金比例计算器的样子
PyQt5是跨平台的 GUI 工具包，一组用于 Qt v5 的Python绑定。由于该库提供的工具和简单性，人们可以非常轻松地开发交互式桌面应用程序。下面是安装 PyQt5 的命令
pip install PyQt5概念 ：
下面是计算黄金比例的公式
A / B = (A + B) / A = golden_ratio
这里A是较大的长度，B是较短的长度，即长度的第二部分，黄金比例的值为1.61803398875。
GUI Implementation Steps :
1. Create a heading label that display the calculator name
2. Create three radio buttons for first, second and sum of the lengths
3. Create three spin boxes for user to enter the specific length
4. Create push button for calculating the other values according tot golden ratio
5. Create a label to show the calculated values
Back-End Implementation :
1. Initially make all the spin boxes disable
2. Add same action to all the three radio button
3. Inside the radio button method which radio button is checked
4. According to the checked radio button make the corresponding spin box enable and make the rest of the spin box disable
5. Also assign the flag values according to the selected radio button
6. Add same action to all three spin boxes
7. Inside the spin box action check which spin box is enabled and make other spin box values zero
8. Add action to the push button
9. Inside the push button action check the flag according to the flag with the help of golden ratio formula calculate the other two lengths
10. Format the calculated values and show the values with the help of result label
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 datetime
import sys
class Window(QMainWindow):
def __init__(self):
super().__init__()
# setting title
self.setWindowTitle("Python ")
# width of window
self.w_width = 400
# height of window
self.w_height = 430
# setting geometry
self.setGeometry(100, 100, self.w_width, self.w_height)
# calling method
self.UiComponents()
# showing all the widgets
self.show()
# method for components
def UiComponents(self):
# creating head label
head = QLabel("Golden Ratio Calculator", self)
head.setWordWrap(True)
# setting geometry to the head
head.setGeometry(0, 10, 400, 60)
# font
font = QFont('Times', 15)
font.setBold(True)
font.setItalic(True)
font.setUnderline(True)
# setting font to the head
head.setFont(font)
# setting alignment of the head
head.setAlignment(Qt.AlignCenter)
# setting color effect to the head
color = QGraphicsColorizeEffect(self)
color.setColor(Qt.darkCyan)
head.setGraphicsEffect(color)
# creating a radio button
self.length1 = QRadioButton("First Length (A)", self)
# setting geometry
self.length1.setGeometry(50, 90, 140, 40)
# setting font
self.length1.setFont(QFont('Times', 9))
# creating a spin box
self.l1 = QSpinBox(self)
self.l1.setMaximum(999999)
# setting geometry to the spin box
self.l1.setGeometry(200, 90, 160, 40)
# setting font
self.l1.setFont(QFont('Times', 9))
# setting alignment
self.l1.setAlignment(Qt.AlignCenter)
# creating a radio button
self.length2 = QRadioButton("Second Length (B)", self)
# setting geometry
self.length2.setGeometry(50, 150, 145, 40)
# setting font
self.length2.setFont(QFont('Times', 9))
# creating a spin box
self.l2 = QSpinBox(self)
self.l2.setMaximum(999999)
# setting geometry to the spin box
self.l2.setGeometry(200, 150, 160, 40)
# setting font
self.l2.setFont(QFont('Times', 9))
# setting alignment
self.l2.setAlignment(Qt.AlignCenter)
# creating a radio button
self.length_sum = QRadioButton("First + Second ", self)
# setting geometry
self.length_sum.setGeometry(50, 200, 140, 40)
# setting font
self.length_sum.setFont(QFont('Times', 9))
# creating a spin box
self.l_s = QSpinBox(self)
self.l_s.setMaximum(999999)
# setting geometry to the spin box
self.l_s.setGeometry(200, 200, 160, 40)
# setting font
self.l_s.setFont(QFont('Times', 9))
# setting alignment
self.l_s.setAlignment(Qt.AlignCenter)
# adding same action to all the radio button
self.length1.clicked.connect(self.radio_method)
self.length2.clicked.connect(self.radio_method)
self.length_sum.clicked.connect(self.radio_method)
# adding same action to all the spin box
self.l1.valueChanged.connect(self.spin_method)
self.l2.valueChanged.connect(self.spin_method)
self.l_s.valueChanged.connect(self.spin_method)
# making all the spin box disabled
self.l1.setDisabled(True)
self.l2.setDisabled(True)
self.l_s.setDisabled(True)
# creating a push button
calculate = QPushButton("Calculate", self)
# setting geometry to the push button
calculate.setGeometry(100, 270, 200, 40)
# adding action to the button
calculate.clicked.connect(self.calculate)
# adding color effect to the push button
color = QGraphicsColorizeEffect()
color.setColor(Qt.blue)
calculate.setGraphicsEffect(color)
# creating a label to show result
self.result = QLabel(self)
# setting properties to result label
self.result.setAlignment(Qt.AlignCenter)
# setting geometry
self.result.setGeometry(50, 330, 300, 70)
# making it multi line
self.result.setWordWrap(True)
# setting stylesheet
# adding border and background
self.result.setStyleSheet("QLabel"
"{"
"border : 3px solid black;"
"background : white;"
"}")
# setting font
self.result.setFont(QFont('Arial', 11))
# method called by the radio buttons
def radio_method(self):
# checking who is checked and who is unchecked
# if first radio button is checked
if self.length1.isChecked():
# making first spin box enable
self.l1.setEnabled(True)
# making rest two spin box disable
self.l2.setDisabled(True)
self.l_s.setDisabled(True)
# assigning flags
self.check1 = True
self.check2 = False
self.check_sum = False
elif self.length2.isChecked():
# making second spin box enable
self.l2.setEnabled(True)
# making rest two spin box disable
self.l1.setDisabled(True)
self.l_s.setDisabled(True)
# assigning flags
self.check1 = False
self.check2 = True
self.check_sum = False
elif self.length_sum.isChecked():
# making third spin box enable
self.l_s.setEnabled(True)
# making rest two spin box disable
self.l1.setDisabled(True)
self.l2.setDisabled(True)
# assigning flags
self.check1 = False
self.check2 = False
self.check_sum = True
def spin_method(self):
# finding who called the method
if self.l1.isEnabled():
# setting current values
self.l2.setValue(0)
self.l_s.setValue(0)
elif self.l2.isEnabled():
# setting current values
self.l1.setValue(0)
self.l_s.setValue(0)
else:
# setting current values
self.l2.setValue(0)
self.l1.setValue(0)
def calculate(self):
golden = 1.61803398875
# if first value is selected
if self.check1 == True:
# getting spin box value
A = self.l1.value()
B = A / golden
Sum = A + B
elif self.check2 == True:
# getting spin box value
B = self.l2.value()
A = B * golden
Sum = A + B
else:
# getting spin box value
Sum = self.l_s.value()
A = Sum / golden
B = Sum - A
# formatting values upto two decimal
A = "{:.2f}".format(A)
B = "{:.2f}".format(B)
Sum = "{:.2f}".format(Sum)
# setting text to the label
self.result.setText("A = " + str(A) + ", B = " + str(B) +
" and Sum = " + str(Sum))
# create pyqt5 app
App = QApplication(sys.argv)
# create the instance of our Window
window = Window()
# start the app
sys.exit(App.exec())
输出 ：