我在这里做错了什么？~~ Python 中的 Tkinter

Question

我目前正在参加编码 class，其中一部分涉及使用 Python 的 Tkinter 函数。我们的任务是创建一个脚本来显示 "earth" 旋转 "Sun"。实际上，所有这一切都是利用基本的几何形状和三角函数（这对开始工作来说是一件痛苦的事情），据我所知，我的代码应该可以工作，但是无论出于何种原因，它都会继续忽略我的 if/elif 声明。我觉得我的困惑是由于缺乏经验和理解造成的，但我希望有人能帮我弄清楚我在这方面做错了什么。感谢您阅读。 ^-^

#import Tkinter package responsible for constructing a
# graphical user interface, GUI

import Tkinter

#from Tkinter, import Canvas Class, which allows us to draw on the GUI
from Tkinter import Canvas, NW, Scale, HORIZONTAL
from math import cos, sin, radians


#create a child object called root. This object is our window. Tk() is 
#the class constructor to instantiate the window
root = Tkinter.Tk()

#call the method title passing in the title of our window
root.title("Earth Orbit")

#create a child object called canvas. This object is our canvas for
#drawing. We instantiate from the Canvas class, calling the constructor and
#passing in the parent of our canvas, and defining the dimenstions
canvas = Canvas(root,width=600,height=600,bg="white")

#call the grid method so that whatever we place on the canvas will be visible
canvas.grid()

color = canvas.create_polygon(0, 0, 0, 600, 600, 600, 600, 0, fill=
"light blue")
season = canvas.create_text(50,100,text="Winter", anchor=NW)
#intial coordinates for our circle
xpos = 275
ypos = 25

Earth = canvas.create_oval(xpos, ypos, xpos+25, ypos+25, fill="blue", outline="cyan")

x = cos(radians(0))
y = sin(radians(0))
Sun = canvas.create_oval(200, 200, 400, 400, fill="orange", outline="yellow")
def changeCirclePosition(event):
    x = 300 + (200*cos(radians(rectSlider.get())))
    y = 300 + (200*-sin(radians(rectSlider.get())))
    canvas.coords(Earth, x, y, x+25, y+25)
rectSlider = Scale(root,from_=0, to=360,orient=HORIZONTAL,label='Change Position',command=changeCirclePosition)    
canvas.create_window(250,500, anchor=NW, window=rectSlider)

if 0<= rectSlider < 90:
        canvas.itemconfigure(color, fill="green")
        canvas.itemconfigure(season,text="Spring")
elif 90<=rectSlider < 180:
        canvas.itemconfigure(color, fill="yellow")
        canvas.itemconfigure(season,text="Summer")
elif 180 <= rectSlider < 270:
        canvas.itemconfigure(color, fill="orange")
        canvas.itemconfigure(season,text="Autumn")
elif 270 <= rectSlider < 360:
        canvas.itemconfigure(color, fill="light blue")
        canvas.itemconfigure(season,text="Winter")
canvas.focus_set()
root.mainloop()

Answer 1

您必须将这些比较放在回调中。此外，您不能将 Scale 本身与整数进行比较，您必须获取其值，就像对 x 和 y:

所做的那样

def changeCirclePosition(event):
    x = 300 + (200*cos(radians(rectSlider.get())))
    y = 300 + (200*-sin(radians(rectSlider.get())))
    canvas.coords(Earth, x, y, x+25, y+25)
    if 0<= rectSlider.get() < 90:
            canvas.itemconfigure(color, fill="green")
            canvas.itemconfigure(season,text="Spring")
    elif ...

我在这里做错了什么？~~ Python 中的 Tkinter

What am I doing wrong here?~~Tkinter in Python

python

tkinter

tkinter-canvas