Python tkinter库之Canvas按键事件移动物体 (模拟推箱子小游戏)

Canvas上的物体用 bind_all(键值,事件函数(event)) 绑定后,就可用move(物体的id,横向移动坐标,纵向移动坐标) 来移动物体了。以下代码模拟了推箱子小游戏中箱子移动的动作,仅限制了边界暂没有添加其它箱子和砖墙等障碍物:

import tkinter as tk
import pyautogui as ag
 
def Box_Move(event):
    global x,y,w
    if event.keysym == "Up":
        if y-w>0:
            tCanvas.move(box,0,-w)
            tCanvas.move(box2,0,-w)
            tCanvas.move(pol,0,-w)
            y-=w
    elif event.keysym == "Down":
        if y+w<400-w:
            tCanvas.move(box,0,w)
            tCanvas.move(box2,0,w)
            tCanvas.move(pol,0,w)
            y+=w
    elif event.keysym == "Left":
        if x-w>0:
            tCanvas.move(box,-w,0)
            tCanvas.move(box2,-w,0)
            tCanvas.move(pol,-w,0)
            x-=w
    elif event.keysym == "Right":
        if x+w<400-w:
            tCanvas.move(box,w,0)
            tCanvas.move(box2,w,0)
            tCanvas.move(pol,w,0)
            x+=w
 
def Window_Open(W, H):
    X, Y = ag.size()
    winSize = "%sx%s"%(str(W),str(H))
    winPos = winSize + '+%s+%s'%(str((X-W)//2),str((Y-H)//2))
    win.geometry(winPos)
    win.resizable(False, False)
    title = u'桌面分辨率:%sx%s%s窗体大小:%s'%(str(X),str(Y),' '*3,winSize)
    win.title(title)
    win.update()
 
def Draw_Lines(w):
    for i in range(20,400,w):
        coord = 20,i,380,i
        tCanvas.create_line(coord)
        coord = i,20,i,380
        tCanvas.create_line(coord)
 
def Draw_Box():
    global box,pol,box2
    box = tCanvas.create_rectangle(x,y,x+w,y+w,width=2,fill='yellow')
    coord = (x+2,y+2,x+20,y+20,x+2,y+38,x+38,y+38,x+20,y+20,x+38,y+2)
    pol = tCanvas.create_polygon(coord,width=2,outline='green',fill='gold')
    box2 = tCanvas.create_rectangle(x+2,y+2,x+w-2,y+w-2,width=2,outline='red')
 
if __name__ == '__main__':
 
    win = tk.Tk()
    Window_Open(400,400)
 
    tCanvas = tk.Canvas(win, width=win.winfo_width(), height=400, bg='honeydew')
    tCanvas.pack(side="top")
 
    x ,y, w = 100, 100, 40
 
    Draw_Lines(w)
    Draw_Box()
 
     #绑定上下左右方向按键事件
    tCanvas.bind_all("<KeyPress-Up>",   Box_Move)
    tCanvas.bind_all("<KeyPress-Down>", Box_Move)
    tCanvas.bind_all("<KeyPress-Left>", Box_Move)
    tCanvas.bind_all("<KeyPress-Right>",Box_Move)
 
    win.mainloop()