Question

我已阅读有关id()这项工作的文档

myvar='asd'
print id(myvar)

但是在这段代码中我无法理解它是如何工作的

from Tkinter import *
import time
import random

class pelota:
    def __init__(self,canvas,raqueta,color):
        self.canvas=canvas
        self.raqueta=raqueta
        self.id=canvas.create_oval(10,10,25,25, fill=color)
        self.canvas.move(self.id,250,125)
        empezar=[-5,-4,-3,-2,-1,1,2,3,4,5]
        random.shuffle(empezar)
        self.x=empezar[0]
        self.y=-3
        self.canvas_height = self.canvas.winfo_height()
        self.canvas_width = self.canvas.winfo_width()

    def golpea_raqueta(self, pos):
        raqueta_pos = self.canvas.coords(self.raqueta.id)
        if pos[2] >= raqueta_pos[0] and  pos[0] <= raqueta_pos[2]:
            if pos[3] >=raqueta_pos[1] and pos[3] <= raqueta_pos[3]:

我在谈论这个具体的路线

 self.raqueta=raqueta


  raqueta_pos = self.canvas.coords(self.raqueta.id)

id如何工作（self.raqueta.id）？

完整代码

from Tkinter import *
import time
import random

class pelota:
    def __init__(self,canvas,raqueta,color):
        self.canvas=canvas
        self.raqueta=raqueta
        self.id=canvas.create_oval(10,10,25,25, fill=color)
        self.canvas.move(self.id,250,125)
        empezar=[-5,-4,-3,-2,-1,1,2,3,4,5]
        random.shuffle(empezar)
        self.x=empezar[0]
        self.y=-3
        self.canvas_height = self.canvas.winfo_height()
        self.canvas_width = self.canvas.winfo_width()

    def golpea_raqueta(self, pos):
        raqueta_pos = self.canvas.coords(self.raqueta.id)
        if pos[2] >= raqueta_pos[0] and  pos[0] <= raqueta_pos[2]:
            if pos[3] >=raqueta_pos[1] and pos[3] <= raqueta_pos[3]:
                return True
        return False

    def dibujar(self):
        self.canvas.move(self.id,self.x,self.y)
        pos = self.canvas.coords(self.id)
        if pos[1]<=0:
            self.y=3
        if pos[0]<=0:
            self.x=3
        if pos[2]>= self.canvas_width :
            self.x=-3
        if self.golpea_raqueta(pos) == True:
            self.y=-3
        if pos[3] >= self.canvas_height :
            self.y=-3

class raqueta:
    def __init__(self,canvas,color):
        self.canvas=canvas
        self.id=self.canvas.create_rectangle(10,10,100,20, fill=color)
        self.canvas.move(self.id , 200,300)
        self.x = 0
        self.canvas_width = self.canvas.winfo_width()
        self.canvas.bind_all('<KeyPress-Left>', self.izqu)
        self.canvas.bind_all('<KeyPress-Right>', self.dere)

    def dibujar(self):
        self.canvas.move(self.id,self.x,0)
        pos = self.canvas.coords(self.id)
        if pos[0]<=0:
            self.x=0
        if pos[0]>0:
            self.x=0
        elif pos[2]>=self.canvas_width:
            self.x=0
    def izqu(self,evt):
        self.x=-20


    def dere(self,evt):
        self.x=20

vent= Tk()
vent.title('mipong')
vent.resizable(0,0)
vent.wm_attributes('-topmost',1)
canvas= Canvas(vent, width=500,height=500, bd=0,highlightthicknes=0)
canvas.pack()
vent.update()

raqueta= raqueta(canvas,'blue')    
pelota=pelota(canvas,raqueta,'red')


#help(Tkinter.Canvas.winfo_height)
while 1:
    pelota.dibujar()
    raqueta.dibujar()
    vent.update_idletasks()
    vent.update()
    time.sleep(0.01)

Answer 1

在画布上创建项目时，它会返回唯一标识符。在您发布的代码中，您将标识符分配给self.id。虽然名称类似于名为id的内置函数，但它们完全不相关。

为避免混淆，您可以将self.id重命名为self.canvas_id

Python - 我不明白这种ID情况

1 个答案: