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A graphing calculator for Arduboy! Not quite complete, and not well organized.

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TheV360/ArduboyGraph2

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Graph 2 (for the Arduboy)

A graphing calculator for your Arduboy!

Features

Here's what's currently here:

  • Simple keypad for entering numbers
  • An RPN calculator
  • Graph output
  • Shunting-yard algorithm for converting user-readable functions.
  • Formula keyboard
  • Direct mode (enter formulas, get response)
  • Table view

Here's what I hope to accomplish in the near future:

  • Better error reporting
  • Coherent UI
  • Table "entry mode" and "jump to" setting.
  • Settings (disable axis lines, dots instead of lines, DEG or RAD, etc.)

Known Issues

Some issues are copied from the Arduboy forum thread:

  • Division operations are reversed (Function-related issue)
  • Cursor soft-resets Arduboy when it goes offscreen on main menu RPN debug screen (GraphFont-related issue)
    • This is "solved" but the root issue is not solved.
  • Implicit Multiplication doesn't work (Function-related issue) - 2x
  • Error reporting doesn't exist - functions fail silently (Function-related issue) - x+
    • Error reporting should happen in two stages -- one where the char string is being parsed, one where the function is being graphed. This would allow for syntax errors to be reported in a place nicer than the graph's draw function.
  • Graph object wastes a lot of memory by storing all Y values (Graph-related issue)
  • Prepare for functions by converting existing char input system over to a token-based system (Big issue)
    • This means using a more TI-84-like system where there's a dedicated unary minus token and it's completely different from the subtraction token.
  • Unary Negative doesn't work (Function-related issue) - -5*x
  • Optimize more menus (draw only when you need to)
  • There are a few todos hidden in the code.
  • Why does cursor.cpp exist?

Screenshots

I'm still working on parts of the UI!

  • The window settings are next to recieve an overhaul. I'll add simple "nudge" and "zoom" controls and make the stuff there look better.
  • The trace menu is very bare. Need to improve it too.
  • Direct could look much much better. A scrolling display not unlike the TI-84 would be welcome.

Here's the menus that are already "done": Main Menu Editing a Function The Table, in Sequential Mode

If you want to see where I started, check out this Twitter thread!

Credits

  • Me - UI, RPN calculator, font
  • SmileBASIC Discord - A lot of help with C++
  • snail_ - Some help with the Shunting-Yard Algorithm
  • yinkou - TinyFont code, used as base for GraphFont

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A graphing calculator for Arduboy! Not quite complete, and not well organized.

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