python画圆形_python怎么用turtle画圆

Zelle图形模块不提供直接绘制半圆（圆弧）的代码。但是，由于该模块是用Python编写的，建立在Tkinter的，和Tkinter的提供了一个圆弧绘制函数，我们可以添加自己的弧子类，从Zelle椭圆形类继承并实现弧：

from graphics import *

class Arc(Oval):

def __init__(self, p1, p2, extent):

self.extent = extent

super().__init__(p1, p2)

def __repr__(self):

return "Arc({}, {}, {})".format(str(self.p1), str(self.p2), self.extent)

def clone(self):

other = Arc(self.p1, self.p2, self.extent)

other.config = self.config.copy()

return other

def _draw(self, canvas, options):

p1 = self.p1

p2 = self.p2

x1, y1 = canvas.toScreen(p1.x, p1.y)

x2, y2 = canvas.toScreen(p2.x, p2.y)

options['style'] = tk.CHORD

options['extent'] = self.extent

return canvas.create_arc(x1, y1, x2, y2, options)

win = GraphWin("My arc example", 200, 200)

arc = Arc(Point(50, 50), Point(100, 100), 180)

arc.setFill("red")

arc.draw(win)

win.getMouse()

win.close()

输出