Turtle 窗口

请看下图，turtle窗口图标是一片小叶子，估计它就是继承自 tkinter 库。

tkinter 窗口

参阅了一些资料，发现 turtle 方法可直接在 tkinter 的画布Canvas上操作：

  

源代码

from tkinter import *
from turtle import RawTurtle
 
def circ():
    tu.penup()
    tu.home()
    tu.clear()
    tu.speed(0)
    [x,y,R] = et1.get().split(',')
    try:
        x = int(x.replace('(',''))
        y = int(y.replace(')',''))
        R = int(R.strip())
    except:
        x,y,R = 0,0,50  #输入错误则赋予默认值
    
    tu.goto(x,y-R)
    tu.pendown()
    tu.circle(R)
    
def rect():
    tu.penup()
    tu.home()
    tu.clear()
    tu.speed(0)
    tu.color('red', 'yellow')
    tu.begin_fill()
    [d,rad] = et2.get().split(',')
    try:
        d = int(d)
        rad = int(rad)
    except:
        d,rad = 200,216  #输入错误则赋予默认值
    tu.pendown()
    tu.back(d//5)
    while True:
        tu.forward(d)
        tu.left(rad)
        if abs(tu.pos()[0]+d//5)<0.1 and abs(tu.pos()[1])<0.1:
            break
    tu.end_fill()

def taiji():
    tu.penup()
    tu.home()
    tu.clear()
    tu.speed(0)
    d = et3.get()
    try:
        d = int(d)
    except:
        d = 120  #输入错误则赋予默认值
    tu.hideturtle()
    tu.goto(d//2,-d)
    tu.pendown()
    tu.begin_fill()
    tu.color('black','black')
    tu.circle(d,extent=180)
    tu.circle(d//2,extent=180)
    tu.circle(-d//2,extent=180)
    tu.end_fill()
    tu.circle(-d,extent=180)
    tu.penup()
    tu.goto(d//2,-d//6*4)
    tu.pendown()
    tu.begin_fill()
    tu.fillcolor("black")
    tu.circle(d//5,extent=360)
    tu.end_fill()
    tu.penup()
    tu.goto(d//2,d//3)
    tu.pendown()
    tu.begin_fill()
    tu.fillcolor("white")
    tu.circle(d//5,extent=360)
    tu.end_fill()
    tu.penup()

def main():
    global tu,et1,et2,et3
    root = Tk()
    root.geometry('520x520+150+300')
    root.title('turtle在tkinter.Canvas上的操作')
    root.resizable(False, False)
    canvas = Canvas(root, width=640, height=400)
    canvas.pack()
 
    tu = RawTurtle(canvas)
    tu.hideturtle()
 
    et1 = Entry(root, width=12)
    et1.place(x = 30, y = 480)
    et1.insert(0,'(50,-20), 100')
    bt1 = Button(root,text=' 画圆 ',command=circ)
    bt1.place(x = 60, y = 425)

    et2 = Entry(root, width=12)
    et2.place(x = 190, y = 480)
    et2.insert(0,'200, 216')
    bt2 = Button(root,text=' 多角星(或多边形) ',command=rect)
    bt2.place(x = 180, y = 425)
    
    et3 = Entry(root, width=12)
    et3.place(x = 360, y = 480)
    et3.insert(0,'120')
    bt3 = Button(root,text=' 太极 ',command=taiji)
    bt3.place(x = 380, y = 425)

    root.mainloop()
 
 
if __name__ == '__main__':
 
    main()

turtle和tkinter混合使用

turtle和tkinter两者搭配使用，使得 turtle 的画图参数可以由 tkinter 的控件当场设置，这样就实现了turtle小海龟的现场互动，运行效果见图二。

三个Entry控件，分别设置： 
　　1. 圆心坐标和圆的直径；
　　2. 多边形的边长和边的转动角度；
　　3. 太极图的外圆直径。

(本篇完)
 

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