The Canvas Arc Style Nobody Uses

I needed a circular progress gauge. Googled "Python circular progress bar." Every answer: pip install this library.

I drew mine with pure Canvas. Zero dependencies. Here's the trick everyone misses. It lives in the new "First Setup & Drivers" page — clean, pure tkinter. The secret? Two parameters most devs never touch.

def _draw_arc(self, canvas, score):
    # background arc
    canvas.create_arc(10, 10, 110, 110,
        start=225, extent=-270,
        style="arc", outline="#1f2937", width=7)
    # progress arc
    canvas.create_arc(10, 10, 110, 110,
        start=225, extent=-int(270 * score / 100),
        style="arc", outline=color, width=7)

style="arc" is the magic. Most people only use Canvas for rectangles or ovals. Almost nobody knows that style="arc" draws perfect circle segments.

tkinter's Canvas has three arc styles

• style="pieslice" — pie-chart wedge (the default)
• style="chord" — arc with a straight line connecting the ends
• style="arc" — just the arc, nothing else

That third one? That's your circular progress bar. 99% of developers only ever use the first one — or don't use arcs at all.

This powers the health check in PC Workman (110+ downloads, 23 GitHub stars) and makes the whole section feel premium — all because I knew the weird, forgotten corners of tkinter instead of reaching for another dependency.

The most beautiful UI doesn't always come from adding packages. Sometimes it comes from actually reading the docs of what you already have.