Feature: Export Plotted Data as Image Files (PNG/SVG)

[karthikc1125]

Currently, ComChan provides real-time serial data plotting in the terminal (TUI). However, there is no option to export plotted data as image files.

This issue proposes adding a feature to export plotted data as image files (e.g., PNG or SVG), enabling users to save and share visualizations outside the terminal.

This feature is already listed as “Coming Soon” in the documentation, so implementing it would align the project with planned functionality.

🎯 Proposed Solution

Capture existing plot data (already stored for visualization).

Use a Rust plotting crate such as:

plotters

or image + custom rendering

Generate a PNG or SVG file.

Add a CLI flag or keybinding (example: --export or press E in TUI).

Example idea:

comchan --export output.png

Or inside TUI:

Press E → Save current plot as image.

✅ Acceptance Criteria

User can export current plot as PNG

Export works with real-time data buffer

Saved image has proper axis scaling and labels

No impact on existing TUI performance

Documentation updated

💡 Why This Feature Matters

Enables sharing data visually

Useful for reports and debugging

Improves project completeness

Matches documentation roadmap

Please assign me under OSCG

[Vaishnav-Sabari-Girish]

Yes. I was trying to work on this. It would be really great if this works. I shall assign this to you @karthikc1125 . Thank you.