Simple graphing calculator for 3DS
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README.md

Graphing Calculator for 3DS

I guess you could say this is the exact opposite of games that run on graphing calculators.

Requires sf2dlib.

Controls

  • Circle pad: Pan view, move cursor
  • C-stick: Control sliders A and B (New 3DS only, may work with Circle Pad Pro)
  • L / R: Zoom
  • Up / Down: Change active plot (for equation editing/trace cursor)
  • Left / Right: Fine trace, change screen page
  • A: Enter equation using algebraic notation (what you're probably used to)
  • X: Hold for free cursor
  • Y: Hold to trace graph (hold B to snap to units)
  • Select: Toggle alt-function mode (like the 2nd key)
  • Start: Quit

About variable sliders

Adjustable variable sliders are a new feature in version 1.3. They enable you to add values to graphs that you can easily adjust and experiment with, without the need to manually enter in different values (which can be annoying if they aren't at the end of the equation.) The sliders are on a new "page" on the screen; press Left or Right on the D-pad to switch pages. (This is the only other page as of 1.3, but there may be more in the future, and the code is already written to support more than two.)

You will then see four sliders, labeled 'a', 'b', 'c', and 'd'. The labels to the left are actually buttons; pressing them will insert the variable into the equation just like the 'x' button on the main page. To the right of each slider is a button labeled "0-1". This will reset the range of the slider to the default of, well, 0 to 1. You can extend the range of the sliders by holding down L or R while dragging past the left or right. You can shorten the range by setting the slider to the value you want to be the minimum or maximum, activating alt-mode (press Select) and pressing the button to the left (for minimum) or right (for maximum) of the slider.

Important notes

  • By default, equations are entered in RPN (Reverse Polish Notation). This means, for example, rather than "sin(4 + x)", you would enter "4 x + sin". You can still enter equations the traditional way (e.g. "sin(4 + x)") by pressing A and using the on-screen keyboard. (Pressing A in alt mode will insert the function of X as an RPN function instead of replacing the existing expression.)
  • If you've entered a number and want to start entering a new number immediately after, press the decimal point key twice, or only once if there's already a decimal point.

Libraries used

  • sf2dlib, by xerpi
  • SF2DBmpFont, by myself (included in source code download)
  • tinyexpr, by codeplea (included as submodule, use git clone --recursive)