如何在 Python Tkinter Canvas 中隐藏多边形？

Question

我的代码的目的是用三角形代替光标。但是，我需要一个解决方案来删除以前通过光标移动绘制的三角形。

这是我的原始代码：

from tkinter import*
tk = Tk()
tk.resizable(0,0)
tk.attributes('-topmost',True)
window = Canvas(width = 1300, height = 700, bg = 'black',\
            highlightthickness=0, relief='ridge')
window.pack()
window.config(cursor='none')

class Cursor:

    def __init__(self,canvas):

        self.canvas = canvas    
        self.id = self.canvas.create_polygon(0,0,10,0,0,-10)

    def Move(self):

        self.Mousex = self.canvas.winfo_pointerx()
        self.Mousey = self.canvas.winfo_pointery()
        self.id = self.canvas.create_polygon(self.Mousex,self.Mousey,\
                                         self.Mousex+10,self.Mousey,\
                                         self.Mousex,self.Mousey-10,\
                                         fill = 'red')
Cursor1 = Cursor(window)

while 1:
    tk.update_idletasks()
    window.update()
    Cursor1.Move()

我试过下面的代码，但是根本没有出现三角形。在下面的代码中，我插入了一个：

self.canvas.delete(self.id)

所以代码是：

from tkinter import*
tk = Tk()
tk.resizable(0,0)
tk.attributes('-topmost',True)
window = Canvas(width = 1300, height = 700, bg = 'black',\
            highlightthickness=0, relief='ridge')
window.pack()
window.config(cursor='none')

class Cursor:

    def __init__(self,canvas):

        self.canvas = canvas    
        self.id = self.canvas.create_polygon(0,0,10,0,0,-10)

    def Move(self):

        self.Mousex = self.canvas.winfo_pointerx()
        self.Mousey = self.canvas.winfo_pointery()
        self.id = self.canvas.create_polygon(self.Mousex,self.Mousey,\
                                         self.Mousex+10,self.Mousey,\
                                         self.Mousex,self.Mousey-10,\
                                         fill = 'red')
        self.canvas.delete(self.id)

Cursor1 = Cursor(window)

while 1:
    tk.update_idletasks()
    window.update()
    Cursor1.Move()

Answer 1

Canvas 已经定义了一个 move 方法，您可以改用它：

from tkinter import*
tk = Tk()
tk.resizable(0,0)
tk.attributes('-topmost',True)
window = Canvas(width = 1300, height = 700, bg = 'black',\
            highlightthickness=0, relief='ridge')
window.pack()
window.config(cursor='none')

class Cursor:

    def __init__(self,canvas):

        self.canvas = canvas    
        self.id = self.canvas.create_polygon(0,0,10,0,0,-10, fill='red')
        self.Mousex = 0
        self.Mousey = 0

    def Move(self):

        _new_x = self.canvas.winfo_pointerx()
        _new_y = self.canvas.winfo_pointery()
        self.canvas.move(self.id, _new_x - self.Mousex, _new_y - self.Mousey)
        self.Mousex = _new_x
        self.Mousey = _new_y
        #self.canvas.delete(self.id)

Cursor1 = Cursor(window)

while 1:
    tk.update_idletasks()
    window.update()
    Cursor1.Move()

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