Source: https://mayphus.org/calculus/
Title: Calculus canvas source study
Metadata: {"kind":"artifact","language":"en","route":"/calculus/","status":"archived","tags":["mathematics","calculus"],"type":"page"}

Calculus canvas source study

The original TypeScript and Racket files were recovered on 7 October 2026. They describe three canvas figures with different controls:

- A limit figure places an open point on y = x + 1 at x = 1 and moves nearby points toward it.
- A derivative figure uses f(x) = x²/2 + 1, comparing a secant line with the tangent as the step size changes.
- An integral figure uses midpoint rectangles for the same quadratic, accumulating area from -2 to an adjustable endpoint. The rectangle count controls the approximation.

The Racket export path writes an HTML page and copies its stylesheet and compiled script. This is a webpage export, not evidence of downloadable static calculus figures.

The recovered source establishes the intended examples and their implementation. The browser interaction and export command were not rerun in this recovery, and this public page does not expose a live calculus widget.