arc and ellipse are not presented to the visual backend

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Assessment

Difficulty
2/5
Estimated time
1-3 hours
Newbie friendliness
82/100
Issue type
Bug
Clarity
Clearly specified
Activity status
Quiet
Tech stack
rust
Domain
computer-graphics

Research direction

Start in shapes.rs at shapes::arc (line 119) and shapes::ellipse (line 214), comparing their visual-backend handling with line, circle, rectangle, and putpixel. Add the corresponding draw-and-present behavior while respecting batch_mode. Run a visual-backend configuration and verify that arcs and ellipses appear in the window.

Written by the indexing model from the issue text.

Description

bug good first issue kilo-auto-fix kilo-triaged parity regression

shapes::arc (shapes.rs:119) and shapes::ellipse (shapes.rs:214) write to the page buffer but lack the #[cfg(feature = "visual-backend")] present block that line/circle/rectangle/putpixel have. Result: nothing appears in the window.

Fix: add the same draw+present block (respecting batch_mode).

Acceptance: arc/ellipse visible in visual-backend run.

Part of #3.

Dominant language
Rust
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