tkinter
requests
json

# Python3程序使用Tkinter创建距离时间GUI计算器
# 从tkinter模块导入所有内容
from tkinter import *
# 导入模块
import requests, json
# 查找两个地方之间的距离和持续时间的功能
def result(source, destination, travel_modes):
    # 在此处输入您的API密钥
    api_key = 'Your_api_key'
    # 用于存储基本URL的基本变量
    base = 'https://maps.googleapis.com/maps/api/distancematrix/json?'
    # 检查出行方式
    if travel_modes == "train":
        # complete_url变量，用于存储完整的URL地址
        complete_url = base + 'origins =' + source + \
                      '&destinations =' + destination + \
                      '&mode = transit&transit_mode = train' + \
                      '&key ='+api_key
        # 请求模块的get方法返回响应对象
        r = requests.get(complete_url)
    else:
        # complete_url变量，用于存储完整的URL地址
        complete_url = base + 'origins =' + source+ \
                       '&destinations ='+ destination + \
                       '&mode ='+travel_modes+'&key ='+ api_key
        # 请求模块的get方法返回响应对象
        r = requests.get(complete_url)
    # 响应对象的json方法将json格式的数据转换为Python格式的数据
    x = r.json()
    # x包含嵌套字典列表
    # 我们知道字典包含键值对
    # 从x字典中提取有用的信息
    row = x['rows'][0]
    cell = row['elements'][0]
    # 检查对应于单元格字典中状态键的值
    if cell['status'] == 'OK' :
        # 在文本输入框中插入值的insert方法.
        # 从单元格字典中提取有用的信息，然后插入相应的文本字段中
        distance_field.insert(10, cell['distance']['text'])
        duration_field.insert(10, cell['duration']['text'])
    else :
        # insert方法在文本输入框中插入值。
        # 从单元格字典中提取与状态键对应的值，并将其插入相应的文本字段中。
        mode_field.insert(10, cell['status'])
        distance_field.insert(10, cell['status'])
# 从相应的文本输入框获取值的函数和调用结果函数。
def find() :
    # get方法从文本输入框中以字符串形式返回当前文本
    source = source_field.get()
    destination = destination_field.get()
    travel_modes = mode_field.get()
    # 调用result()函数
    result(source, destination, travel_modes)
# 在mode_field文本输入框中插入火车字符串的函数
def train() :
    mode_field.insert(10, "train")
# 在模式字段输入框中插入驱动字符串的功能
def driving() :
    mode_field.insert(10, "driving")
# 用于在mode_field文本输入框中插入步行字符串的函数
def walking() :
    mode_field.insert(10, "walking")
# 清除source_field，distance_field，duration_field文本输入框内容的函数.
def del_source() :
    source_field.delete(0, END)
    distance_field.delete(0, END)
    duration_field.delete(0, END)
# 清除destination_field，distance_field，duration_field文字输入框.
def del_destination() :
    destination_field.delete(0, END)
    distance_field.delete(0, END)
    duration_field.delete(0, END)
# 清除mode_field，distance_field，duration_field文本输入框内容的函数.
def del_modes() :
    mode_field.delete(0, END)
    distance_field.delete(0, END)
    duration_field.delete(0, END)
# 清除所有文本输入框的内容的函数
def delete_all() :
    source_field.delete(0, END)
    destination_field.delete(0, END)
    mode_field.delete(0, END)
    distance_field.delete(0, END)
    duration_field.delete(0, END)
# 驱动程式码
if __name__ == "__main__" :
    # 创建一个GUI窗口
    root = Tk()
    # 设置GUI窗口的背景色
    root.configure(background = 'light green')
    # 设置GUI窗口的配置
    root.geometry("500x300")
    # 创建使用距离时间计算器标签
    headlabel = Label(root, text = 'welcome to distance time calculator',
                      fg = 'black', bg = "red")
    # 创建源：标签
    label1 = Label(root, text = "Source:",
                   fg = 'black', bg = 'dark green')
    # 创建目标：标签
    label2 = Label(root, text = "Destination:",
                   fg = 'black', bg = 'dark green')
    # 创建选择旅行方式：标签
    label3 = Label(root, text = "Choose travelling modes: ",
                   fg = 'black', bg = 'red')
    # 创建距离：标签
    label4 = Label(root, text = "Distance:",
                    fg = 'black', bg = 'dark green')
    # 创建持续时间：标签
    label5 = Label(root, text = "Duration:",
                    fg = 'black', bg = 'dark green')
    # 网格方法用于将小部件放置在表格状结构的各个位置.
    headlabel.grid(row = 0, column = 1)
    label1.grid(row = 1, column = 0, sticky ="E")
    label2.grid(row = 2, column = 0, sticky ="E")
    label3.grid(row = 3, column = 1)
    label4.grid(row = 7, column = 0, sticky ="E")
    label5.grid(row = 8, column = 0, sticky ="E")
    # 创建一个文本输入框以填充或键入信息.
    source_field = Entry(root)
    destination_field = Entry(root)
    mode_field = Entry(root)
    distance_field = Entry(root)
    duration_field = Entry(root)
    # 网格方法用于将小部件放置在表格状结构的各个位置.
    # ipadx关键字参数设置条目空间的宽度 .
    source_field.grid(row = 1, column = 1, ipadx ="100")
    destination_field.grid(row = 2, column = 1, ipadx ="100")
    mode_field.grid(row = 5, column = 1, ipadx ="50")
    distance_field.grid(row = 7, column = 1, ipadx ="100")
    duration_field.grid(row = 8, column = 1, ipadx ="100")
    # 创建一个CLEAR按钮并附加到del_source函数
    button1 = Button(root, text = "CLEAR", bg = "red",
                     fg = "black", command = del_source)
    # 创建一个CLEAR按钮并附加到del_destination
    button2 = Button(root, text = "CLEAR", bg = "red",
                     fg = "black", command = del_destination)
    # 创建一个RESULT按钮并附加到查找功能
    button3 = Button(root, text = "RESULT",
                     bg = "red", fg = "black",
                                command = find)
    # 创建一个CLEAR ALL按钮并附加到delete_all函数
    button4 = Button(root, text = "CLEAR ALL",
                     bg = "red", fg = "black",
                            command = delete_all)
    # 创建训练按钮并附加到训练功能
    button5 = Button(root, text = "Train", command = train)
    # 创建驾驶按钮并附加到驾驶功能
    button6 = Button(root, text = "Driving", command = driving)
    # 创建步行按钮并附加到步行功能
    button7 = Button(root, text = "Walking", command = walking)
    # 创建一个CLEAR按钮并附加到del_modes函数
    button8 = Button(root, text = "CLEAR",
                     fg = "black", bg = "red",
                           command = del_modes)
    # 网格方法用于将小部件放置在表格状结构的各个位置.
    button1.grid(row = 1, column = 2)
    button2.grid(row = 2, column = 2)
    button3.grid(row = 6, column = 1)
    button4.grid(row = 9, column = 1)
    button5.grid(row = 4, column = 0)
    button6.grid(row = 4, column = 1)
    button7.grid(row = 4, column = 2)
    button8.grid(row = 5, column = 2)
    # 启动GUI
    root.mainloop()