以下是我找到tkinker透過canvas去拖拉圖案，
但是如何把背景換成我要的圖片?

    canvas = tk.Canvas(master, width=700,height=500,bd=0, highlightthickness=0)
    imgpath = 'path/to/yourfile'
    img = Image.open(imgpath)
    photo = ImageTk.PhotoImage(img)
    canvas.create_image(1080, 720, image=photo)

以上是我找到tk的更換背景的碼，但不知道加在哪才對~

import tkinter as tk
print(tk.CURRENT)

class Block():
    def __init__(self, canvas:tk.Canvas):
        self.item_ids = []
        self.canvas = canvas
        
        oval1 = self.canvas. create_oval(80.4,80,50,50,fill='white')
        oval2 = self.canvas. create_oval(180,180,50,50, fill='white')
        self.item_ids.append(oval1)
        self.item_ids.append(oval2)
        self.set_item_mapping()
        
    def move_to(self, x:float , y:float):
        for id in self.item_ids:
            self.canvas.move_to(id, x,y)
            
    def set_item_mapping(self):
        for id in self.item_ids:
            self.canvas.itemMap[id]=self
            

        

class MyCanvas(tk.Canvas):
    def __init__(self,parent):
        super().__init__(parent)
        self.itemToMove = None
        self.relativePos = ()
       
        self.itemMap = {}
        self.bind('<ButtonPress-1>',self.on_mouse_down)
        self.bind('<B1-Motion>',self.on_mouse_drag)
    
    def on_mouse_down(self,event):
        self.relativePos=()
        a = self.find_withtag(tk.CURRENT)
        if len(a)>=1:
             coor = self.coords(a[0])
             x,y =  event.x-coor[0],event.y-coor[1]
             self.relativePos = (x,y)
             self.itemToMove  = a[0]
        else:
            self.itemToMove = None
        
    def move_to(self,item_id,x,y):
        pos = self.coords(item_id)
        self.move(item_id, x-pos[0], y-pos[1])
        
    def on_mouse_drag(self,event):
        if not self.itemToMove: 
            return 
        
        a = self.find_withtag(tk.CURRENT)
        if len(a)>=1:
            self.itemMap[a[0]].move_to(event.x-self.relativePos[0], event.y-self.relativePos[1])

canvas_width = 190
canvas_height =150

master = tk.Tk()

w = MyCanvas(master)
w.pack(fill=tk.BOTH,expand=1)

print(w.find_all())
b=Block(w)

tk.mainloop()