在Tkinter中绘制吃豆人的脸

Question

我正在用Python编写一个贪吃蛇游戏，纯粹是为了好玩。我想用Tkinter图形库来画出贪吃蛇张开的嘴巴（也就是它在吃东西的时候的样子）。我该怎么画出这个张开的嘴呢？我考虑用canvas.create_arc来画嘴巴，但效果不太好 :(

有没有人能帮帮我？谢谢！

Answer 1

这样做是可以的：

import sys
if sys.hexversion > 0x02ffffff:
    from tkinter import *
else:
    from Tkinter import *

class Application(Frame):

    #Creates an arc     
    def draw_pieslice(self, canv,x,y,rad):
        return canv.create_arc(x-rad, y-rad, x+rad, y+rad, fill='yellow', style=PIESLICE, start=self.start_angle, extent=self.stop_angle)

    #To toggle the start and extent values of the arc, such that the pacman opens and closes the mouth
    #Initially the mouth will be completely closed, but as the value is toggled we will get a 45deg space (mouth opens)
    def toggle_mouth(self):
        if self.start_angle is 1:   
            self.start_angle = 45
            self.stop_angle  = 270
        else:                       
            self.start_angle = 1
            self.stop_angle  = 359

    #moves the pacman body horizontally
    def movecircle(self):
        self.repeat = self.repeat - 1           #sets a limit to horizontal movement
        self.canvas.move(self.PacMouth,1,0)     
        if (self.repeat % 10) is 0:             #Adjusting the value in here, will help to adjust the mouth movement speed with the horizontal body movement
            self.toggle_mouth()
            self.canvas.itemconfig(self.PacMouth, start = self.start_angle, extent = self.stop_angle)
        if self.repeat is not 0:
            self.after(10, self.movecircle)     #By adjusting the time, we can adjust the horizontal movement speed

    def __init__(self, master=None):
        Frame.__init__(self, master)

        self.start_angle = 1
        self.stop_angle  = 359

        self.canvas = Canvas(width=800, height=480, bg='black')
        self.canvas.pack(expand=YES, fill=BOTH)
        text = self.canvas.create_text(50,10, text="Pacman! Yeah!", fill="white")
        self.PacMouth = self.draw_pieslice(self.canvas,100,240,20)
        self.repeat = 600

        self.movecircle()


root = Tk()
root.config(bg = "black")
root.title("Im on stack overflow")
root.geometry('{}x{}'.format(800, 480))
root.resizable(width=False, height=False)

app = Application(master=root)
app.mainloop()

Answer 2

你说得对，确实应该使用 create_arc 这个方法。把起始角度设置为 45，然后把范围设置为 270，这样看起来就像是吃豆人正面朝右，嘴巴张开。

因为你刚开始学习，所以我不提供具体的代码，这样你就有机会自己去琢磨了。