Drawing a circle on a
tkinter Canvas is usually done by the
create_oval method. 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.
Here is Solutions:
We have many solutions to this problem, But we recommend you to use the first solution because it is tested & true solution that will 100% work for you.
Here’s a trick known as monkey patching where we actually add a member to the
Canvas. Below is a fully-functioning program (Python 2.7 and 3.x), 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
try: import tkinter as tk except ImportError: import Tkinter as tk # Python 2 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.title("Circles and Arcs") root.mainloop()
from tkinter import * root = Tk() myCanvas = Canvas(root) myCanvas.pack() def create_circle(x, y, r, canvas): #center coordinates, radius x0 = x - r y0 = y - r x1 = x + r y1 = y + r return canvas.create_oval(x0, y0, x1, y1) create_circle(100, 100, 20, myCanvas) create_circle(50, 25, 10, myCanvas) root.mainloop()
Note: Use and implement solution 1 because this method fully tested our system.
Thank you 🙂