🧮 CASIO Scientific Calculator — Rust + egui

Built by 56tytt — שי קדוש הנדסת תוכנה אשקלון 🇮🇱

A pixel-perfect recreation of 3 CASIO scientific calculator models, written in pure Rust with egui.

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📸 Models

Model	Style	Features
fx-82MS	🌸 Pink	S-V.P.A.M, 2nd edition
fx-991ES PLUS	🔵 Blue/Grey	Natural VPAM, all functions
fx-CG50	⬛ Black	Graphing mode, color display

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✨ Features

• ✅ Full scientific math engine (tokenizer → recursive-descent parser → evaluator)
• ✅ Trig functions: sin/cos/tan + inverses + hyperbolic (sinh/cosh/tanh)
• ✅ Logarithms: log, ln, 10^x, e^x
• ✅ Powers & roots: x², x³, √, ∛, xʸ, x⁻¹
• ✅ Factorial n!, combinations nCr, permutations nPr
• ✅ Angle modes: Degrees / Radians / Gradians
• ✅ Memory: M+, M-, RCL, STO + variables A–F, X, Y
• ✅ Engineering notation (ENG)
• ✅ SHIFT / ALPHA modifier keys
• ✅ History (last 50 calculations)
• ✅ Switch between all 3 models in one click

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🚀 Build & Run

git clone https://github.com/56tytt/casio-calc
cd casio-calc
cargo run --release

Requirements:

• Rust 1.75+
• On Linux: sudo apt install libxcb-render0-dev libxcb-shape0-dev libxcb-xfixes0-dev libxkbcommon-dev

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📁 Project Structure

src/
├── main.rs     # Entry point
├── engine.rs   # Math engine: tokenizer + parser + evaluator
├── models.rs   # 3 CASIO model definitions + color palettes
└── ui.rs       # egui rendering

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🦀 Why Rust?

• Zero GC pauses — smooth UI at all times
• Memory safe — no crashes, no undefined behavior
• Blazing fast — evaluates expressions in microseconds
• Single binary — no runtime dependencies

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🙏 Credits

Built with assistance of Claude (Anthropic AI)

📜 License

MIT © 56tytt