汇智学堂-python系列小游戏（井字游戏之六）

2.8判断当前位置是否有棋子
现在我们要判断在落子的时候，当前方格内是否有棋子，如果有给出提示。如果没有，我们就落子。
1、我们选择方格一和方格二来做测试。
2、如果当前位置有棋子，提示已有棋子。
3、如果没有棋子，我们判断颜色后，落下对应颜色的棋子。

实现代码如下：

redorgreen=0
colorx=“green”

position=[0,0,0,0,0,0,0,0,0]

def yesorno():
tkinter.messagebox.showinfo(‘提示’,“提示1”)
if redorgreen==1:
redorgreen=0
else:
redorgreen=1
return

def action(event):
global redorgreen
global colorx

#if redorgreen0 and event.x>100 and event.x<300 and event.y<300 and event.y>100:
# canvas.create_oval(100, 100, 300, 300, fill =colorx )
if redorgreen0:
redorgreen=1
colorx=“red”
else :
redorgreen=0
colorx=“green”
#tkinter.messagebox.showinfo(‘提示’,redorgreen)

if event.x>100 and event.x<300 and event.y<300 and event.y>100:
    if position[0]==0:
        canvas.create_oval(100, 100, 300, 300, fill =colorx )
        position[0]=1;
    else:
        tkinter.messagebox.showinfo('提示',"已有棋子")
        if redorgreen==1:
           redorgreen=0
        else:
           redorgreen=1
           return
    #winyesorno()
if event.x>300 and event.x<500 and event.y<300 and event.y>100:
    if position[1]==0:
        canvas.create_oval(300, 100, 500, 300, fill =colorx )
        position[1]=2;
    else:
        tkinter.messagebox.showinfo('提示',"已有棋子")
        if redorgreen==1:
           redorgreen=0
        else:
           redorgreen=1
           Return

position=[0,0,0,0,0,0,0,0,0]：定义一个数组，存放九个方格的状态：有子，可落绿色棋子，可落红色棋子三种状态。
If,else作为条件判断语句，根据不同情况，落子或提示。

将代码整合起来，整合后完整代码如下：

#-- coding:GBK --

from tkinter import *
import time
import tkinter.messagebox #messagebox
tk = Tk()
tk.title(“雷雷的井字游戏”)
tk.resizable(0, 0)
tk.wm_attributes("-topmost", 1)
canvas = Canvas(tk, width=800, height=800, bd=0, highlightthickness=0)
canvas.pack()
tk.update()

redorgreen=0
colorx=“green”

position=[0,0,0,0,0,0,0,0,0]

#画棋盘
canvas.create_line(100,100,700,100)
canvas.create_line(100,300,700,300)
canvas.create_line(100,500,700,500)
canvas.create_line(100,700,700,700)

canvas.create_line(100,100,100,700)
canvas.create_line(300,100,300,700)
canvas.create_line(500,100,500,700)
canvas.create_line(700,100,700,700)

def yesorno():
tkinter.messagebox.showinfo(‘提示’,“提示1”)
if redorgreen==1:
redorgreen=0
else:
redorgreen=1
return

def action(event):
global redorgreen
global colorx

#if redorgreen0 and event.x>100 and event.x<300 and event.y<300 and event.y>100:
# canvas.create_oval(100, 100, 300, 300, fill =colorx )
if redorgreen0:
redorgreen=1
colorx=“red”
else :
redorgreen=0
colorx=“green”
#tkinter.messagebox.showinfo(‘提示’,redorgreen)

if event.x>100 and event.x<300 and event.y<300 and event.y>100:
    if position[0]==0:
        canvas.create_oval(100, 100, 300, 300, fill =colorx )
        position[0]=1;
    else:
        tkinter.messagebox.showinfo('提示',"已有棋子")
        if redorgreen==1:
           redorgreen=0
        else:
           redorgreen=1
           return
    #winyesorno()
if event.x>300 and event.x<500 and event.y<300 and event.y>100:
    if position[1]==0:
        canvas.create_oval(300, 100, 500, 300, fill =colorx )
        position[1]=2;
    else:
        tkinter.messagebox.showinfo('提示',"已有棋子")
        if redorgreen==1:
           redorgreen=0
        else:
           redorgreen=1
           return
if event.x>500 and event.x<700 and event.y<300 and event.y>100:
    canvas.create_oval(500, 100, 700, 300, fill =colorx )  

if event.x>100 and event.x<300 and event.y<500 and event.y>300:
    canvas.create_oval(100, 300, 300, 500, fill =colorx )
if event.x>300 and event.x<500 and event.y<500 and event.y>300:
    canvas.create_oval(300, 300, 500, 500, fill =colorx )
if event.x>500 and event.x<700 and event.y<500 and event.y>300:
    canvas.create_oval(500, 300, 700, 500, fill =colorx )

if event.x>100 and event.x<300 and event.y<700 and event.y>500:
    canvas.create_oval(100, 500, 300, 700, fill =colorx )
if event.x>300 and event.x<500 and event.y<700 and event.y>500:
    canvas.create_oval(300, 500, 500, 700, fill =colorx )
if event.x>500 and event.x<700 and event.y<700 and event.y>500:
    canvas.create_oval(500, 500, 700, 700, fill =colorx )

canvas.bind(’’, action)

while 1:
tk.update_idletasks()
tk.update()
time.sleep(0.01)

运行这段代码，第一方格已有棋子后，再次单击第一方格内的区域时，提示：已有棋子，第二方格同此。见图2-13、2-14

图2-13

图2-14