Simpler way to draw a circle with tkinter?

by

Here’s a trick known as monkey patching where we actually add a member to the tkinter/Tkinter class 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 extent.

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()

Result:

result of code

More Related Contents:

  1. Cannot use geometry manager pack inside
  2. Freezing/Hanging tkinter GUI in waiting for the thread to complete
  3. Why do my Tkinter widgets get stored as None? [duplicate]
  4. Evenly distributing n points on a sphere
  5. Install tkinter for Python
  6. How to make a Tkinter window jump to the front?
  7. Correct way to implement a custom popup tkinter dialog box
  8. How do I bind the enter key to a function in tkinter?
  9. Python Tkinter Embed Matplotlib in GUI
  10. Using OpenCV with Tkinter
  11. tkinter maximum canvas size?
  12. ttk treeview: alternate row colors
  13. Mutli-threading python with Tkinter
  14. tkinter – How to drag and drop widgets?
  15. TkInter Label Change Font Size by Text Length
  16. Why does Python installed via Homebrew not include Tkinter
  17. Why do I get “AttributeError: NoneType object has no attribute” using Tkinter? Where did the None value come from?
  18. Why does the calculated width and height in pixel of a string in Tkinter differ between platforms?
  19. How to modify the default font in Tkinter?
  20. When using cx_Freeze and tkinter I get: “DLL load failed: The specified module could not be found.” (Python 3.5.3)
  21. Tkinter: windows without title bar but resizable
  22. Is there a way to add close buttons to tabs in tkinter.ttk.Notebook?
  23. Progressbar with Percentage Label?
  24. tkinter optionmenu first option vanishes
  25. Python Unbound Method TypeError
  26. Why do Tkinter’s Radio Buttons all Start Selected When Using StringVar but not IntVar?
  27. Creating a custom widget in tkinter
  28. Move and zoom a tkinter canvas with mouse
  29. Why does tkinter (or turtle) seem to be missing or broken? Shouldn’t it be part of the standard library?
  30. Tkinter locks Python when an icon is loaded and tk.mainloop is in a thread

Leave a Comment