在 Tkinter (Python) 中画圆
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Draw circle in Tkinter (Python)
提问by mgold
Drawing a circle on a tkinter Canvasis usually done by the create_ovalmethod. However, supplying the bounding box is often a confusing way to think about drawing a circle. It's not particularly difficult to come up with a shortcut for it, but I couldn't find anyone else doing something similar, so I'll post it in the hopes someone else finds it useful.
在 a 上画圆tkinter Canvas通常是通过create_oval方法来完成的。然而，提供边界框通常是考虑绘制圆的一种令人困惑的方式。想出一个捷径并不是特别困难，但我找不到其他人做类似的事情，所以我会发布它，希望其他人觉得它有用。
采纳答案by mgold
Here's a trick known as "monkey patching" where we actually add a member to the Tkinterclass Canvas. Below is a fully-functioning program (Python 2.7), of which the third paragraph is of interest. Add it to your code and you can treat tk.Canvas.create_circle(x, y, r, options...)as you would a builtin method, where the options are the same as create_oval. We do something similar for create_arc(fourth paragraph), and give the option to specify an endangle instead of an extent.
这是一个称为“猴子补丁”的技巧，我们实际上向Tkinter类中添加了一个成员Canvas。下面是一个功能齐全的程序（Python 2.7），其中第三段很有趣。将它添加到您的代码中，您可以tk.Canvas.create_circle(x, y, r, options...)像对待内置方法一样对待它，其中的选项与create_oval. 我们对create_arc（第四段）做了类似的事情，并提供指定end角度而不是extent.
import Tkinter as tk
root = tk.Tk()
canvas = tk.Canvas(root, width=200, height=200, borderwidth=0, highlightthickness=0, bg="black")
canvas.grid()
def _create_circle(self, x, y, r, **kwargs):
return self.create_oval(x-r, y-r, x+r, y+r, **kwargs)
tk.Canvas.create_circle = _create_circle
def _create_circle_arc(self, x, y, r, **kwargs):
if "start" in kwargs and "end" in kwargs:
kwargs["extent"] = kwargs["end"] - kwargs["start"]
del kwargs["end"]
return self.create_arc(x-r, y-r, x+r, y+r, **kwargs)
tk.Canvas.create_circle_arc = _create_circle_arc
canvas.create_circle(100, 120, 50, fill="blue", outline="#DDD", width=4)
canvas.create_circle_arc(100, 120, 48, fill="green", outline="", start=45, end=140)
canvas.create_circle_arc(100, 120, 48, fill="green", outline="", start=275, end=305)
canvas.create_circle_arc(100, 120, 45, style="arc", outline="white", width=6, start=270-25, end=270+25)
canvas.create_circle(150, 40, 20, fill="#BBB", outline="")
root.wm_title("Circles and Arcs")
root.mainloop()
Result:
结果：
回答by Edgar Runnman
simpler solution:
更简单的解决方案：
from tkinter import *
root = Tk()
myCanvas = Canvas(root)
myCanvas.pack()
def create_circle(x, y, r, canvasName): #center coordinates, radius
x0 = x - r
y0 = y - r
x1 = x + r
y1 = y + r
return canvasName.create_oval(x0, y0, x1, y1)
create_circle(100, 100, 20, myCanvas)
create_circle(50, 25, 10, myCanvas)
root.mainloop()
