from tkinter import *
root = Tk()
root.geometry("500x450")
root.resizable(0, 0)
root.config(bg="#309cc7")
root.title("Lei de Charles")
def limpar():
    volume_inicial_entrada.delete(0, END)
    temperatura_inicial_entrada.delete(0, END)
    temperatura_final_entrada.delete(0, END)
    resultado.set("")
def app():
    vi = volume_inicial.get()
    ti = temperatura_inicial.get()
    tf = temperatura_final.get()
    d = vi*tf
    volume_final =d/ ti
    volume_finalarr = round(volume_final,2)
    mensagem = f'O volume final é {volume_finalarr} litros.'
    resultado.set(mensagem)
titulo = Label(text="Lei de Charles",
               font=("Arial", "30", "bold"),bg="#309cc7",fg="#ebeef0")
titulo.place(relx=0.24, rely=0.05)

texto_sub1= Label(text="Volume Inicial:",
                    font=("Arial", "15", "bold"),bg="#309cc7",fg="#ebeef0")
texto_sub1.place(relx=0.3, rely=0.25)

texto_sub2= Label(text="Temperatura Inicial(em Kelvin):",
                    font=("Arial", "15", "bold"),bg="#309cc7",fg="#ebeef0")
texto_sub2.place(relx=0.05, rely=0.4)

texto_sub3= Label(text="Temperatura Final(em Kelvin):",
                    font=("Arial", "15", "bold"),bg="#309cc7",fg="#ebeef0")
texto_sub3.place(relx=0.05, rely=0.55)

volume_inicial  = DoubleVar()
volume_inicial_entrada = Entry(textvariable=volume_inicial ,
                             font=("Arial", "12", "bold"),
                             bg="white", fg="blue", justify='center')
volume_inicial_entrada.place(relx=0.66, rely=0.25, relwidth=0.3)

temperatura_inicial = DoubleVar()
temperatura_inicial_entrada = Entry(textvariable=temperatura_inicial  ,
                             font=("Arial", "12", "bold"),
                             bg="white", fg="blue", justify='center')
temperatura_inicial_entrada.place(relx=0.66, rely=0.4, relwidth=0.3)

temperatura_final = DoubleVar()
temperatura_final_entrada = Entry(textvariable=temperatura_final,
                             font=("Arial", "12", "bold"),
                             bg="white", fg="blue", justify='center')
temperatura_final_entrada.place(relx=0.66, rely=0.55, relwidth=0.3)
#
but1 = Button(text="Calcular", bd=2, bg='#107db2', fg='white',
              font=('verdana', 12, 'bold'), command=app)
but1.place(relx=0.05, rely=0.65,  relwidth=0.25, relheight=0.1)
but_limpar = Button(text="Limpar", bd=2, bg='#107db2', fg='white',
                    font=('verdana', 12, 'bold'), command=limpar)
but_limpar.place(relx=0.35, rely=0.65, relwidth=0.25, relheight=0.1)

but_sair = Button(text="Sair", bd=2, bg='#107db2', fg='white',
                    font=('verdana', 12, 'bold'), command=root.destroy)
but_sair.place(relx=0.65, rely=0.65, relwidth=0.25, relheight=0.1)

resultado = StringVar()
resultado_texto = Label(textvariable=resultado,
                           font=("Arial", 12, "bold"), bg="#cfe2f3")
resultado_texto.place(relx=0.05, rely=0.8, relwidth=0.9,relheight=0.1)
root.mainloop()