QT几何图形面积计算器的设计与实现的项目代码与实现结果

以下是QT几何图形面积计算器的设计与实现的代码和实现结果：

代码：

from PyQt5.QtWidgets import *
from PyQt5.QtGui import *
from PyQt5.QtCore import *

import math

class MainWindow(QWidget):
    def __init__(self):
        super().__init__()
        self.setWindowTitle("Geometry Area Calculator")
        self.setGeometry(100, 100, 400, 200)
        self.initUI()

    def initUI(self):
        # 创建控件
        self.geometryComboBox = QComboBox(self)
        self.geometryComboBox.addItem("Rectangle")
        self.geometryComboBox.addItem("Square")
        self.geometryComboBox.addItem("Circle")
        self.geometryComboBox.addItem("Triangle")
        self.geometryComboBox.addItem("Trapezoid")

        self.lengthLabel = QLabel("Length:", self)
        self.widthLabel = QLabel("Width:", self)
        self.sideLabel = QLabel("Side:", self)
        self.radiusLabel = QLabel("Radius:", self)
        self.baseLabel = QLabel("Base:", self)
        self.heightLabel = QLabel("Height:", self)

        self.lengthLineEdit = QLineEdit(self)
        self.widthLineEdit = QLineEdit(self)
        self.sideLineEdit = QLineEdit(self)
        self.radiusLineEdit = QLineEdit(self)
        self.baseLineEdit = QLineEdit(self)
        self.heightLineEdit = QLineEdit(self)

        self.calculateButton = QPushButton("Calculate", self)

        self.areaLabel = QLabel("Area:", self)
        self.areaLineEdit = QLineEdit(self)
        self.areaLineEdit.setReadOnly(True)

        # 设置控件位置和大小
        self.geometryComboBox.setGeometry(20, 20, 120, 30)

        self.lengthLabel.setGeometry(20, 60, 80, 30)
        self.widthLabel.setGeometry(20, 60, 80, 30)
        self.sideLabel.setGeometry(20, 60, 80, 30)
        self.radiusLabel.setGeometry(20, 60, 80, 30)
        self.baseLabel.setGeometry(20, 60, 80, 30)
        self.heightLabel.setGeometry(20, 60, 80, 30)

        self.lengthLineEdit.setGeometry(100, 60, 80, 30)
        self.widthLineEdit.setGeometry(200, 60, 80, 30)
        self.sideLineEdit.setGeometry(100, 60, 80, 30)
        self.radiusLineEdit.setGeometry(100, 60, 80, 30)
        self.baseLineEdit.setGeometry(100, 60, 80, 30)
        self.heightLineEdit.setGeometry(200, 60, 80, 30)

        self.calculateButton.setGeometry(20, 100, 80, 30)

        self.areaLabel.setGeometry(20, 140, 80, 30)
        self.areaLineEdit.setGeometry(100, 140, 80, 30)

        # 设置事件处理函数
        self.geometryComboBox.currentIndexChanged.connect(self.changeGeometry)
        self.calculateButton.clicked.connect(self.calculateArea)

        # 设置默认值
        self.changeGeometry()

    def changeGeometry(self):
        # 根据几何图形类型显示对应的输入框和标签
        geometryType = self.geometryComboBox.currentText()

        if geometryType == "Rectangle":
            self.lengthLabel.setText("Length:")
            self.widthLabel.setText("Width:")
            self.sideLabel.hide()
            self.radiusLabel.hide()
            self.baseLabel.hide()
            self.heightLabel.hide()
            self.sideLineEdit.hide()
            self.radiusLineEdit.hide()
            self.baseLineEdit.hide()
            self.heightLineEdit.hide()
        elif geometryType == "Square":
            self.lengthLabel.setText("Side:")
            self.widthLabel.hide()
            self.sideLabel.hide()
            self.radiusLabel.hide()
            self.baseLabel.hide()
            self.heightLabel.hide()
            self.widthLineEdit.hide()
            self.sideLineEdit.hide()
            self.radiusLineEdit.hide()
            self.baseLineEdit.hide()
            self.heightLineEdit.hide()
        elif geometryType == "Circle":
            self.lengthLabel.hide()
            self.widthLabel.hide()
            self.sideLabel.hide()
            self.radiusLabel.setText("Radius:")
            self.baseLabel.hide()
            self.heightLabel.hide()
            self.lengthLineEdit.hide()
            self.widthLineEdit.hide()
            self.sideLineEdit.hide()
            self.baseLineEdit.hide()
            self.heightLineEdit.hide()
        elif geometryType == "Triangle":
            self.lengthLabel.hide()
            self.widthLabel.hide()
            self.sideLabel.hide()
            self.radiusLabel.hide()
            self.baseLabel.setText("Base:")
            self.heightLabel.setText("Height:")
            self.lengthLineEdit.hide()
            self.widthLineEdit.hide()
            self.sideLineEdit.hide()
            self.radiusLineEdit.hide()
            self.sideLineEdit.hide()
            self.radiusLineEdit.hide()
        elif geometryType == "Trapezoid":
            self.lengthLabel.hide()
            self.widthLabel.hide()
            self.sideLabel.setText("Side:")
            self.radiusLabel.hide()
            self.baseLabel.setText("Base:")
            self.heightLabel.setText("Height:")
            self.lengthLineEdit.hide()
            self.widthLineEdit.hide()
            self.radiusLineEdit.hide()

        self.areaLineEdit.setText("")

    def calculateArea(self):
        # 根据用户输入计算几何图形面积
        geometryType = self.geometryComboBox.currentText()

        try:
            if geometryType == "Rectangle":
                length = float(self.lengthLineEdit.text())
                width = float(self.widthLineEdit.text())
                area = length * width
            elif geometryType == "Square":
                side = float(self.lengthLineEdit.text())
                area = side * side
            elif geometryType == "Circle":
                radius = float(self.radiusLineEdit.text())
                area = math.pi * radius * radius
            elif geometryType == "Triangle":
                base = float(self.baseLineEdit.text())
                height = float(self.heightLineEdit.text())
                area = 0.5 * base * height
            elif geometryType == "Trapezoid":
                side = float(self.sideLineEdit.text())
                base = float(self.baseLineEdit.text())
                height = float(self.heightLineEdit.text())
                area = 0.5 * (side + base) * height

            self.areaLineEdit.setText(str(area))
        except ValueError:
            QMessageBox.warning(self, "Error", "Invalid Input")
        except:
            QMessageBox.warning(self, "Error", "Calculation Error")

if __name__ == "__main__":
    app = QApplication([])
    window = MainWindow()
    window.show()
    app.exec_()

实现结果截图：