Draw circle in Tkinter (Python)
Here's a trick known as "monkey patching" where we actually add a member to the Tkinter
class 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 end
angle instead of an 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:
simpler solution:
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()