https://github.com/evanw/theta

https://github.com/evanw/theta

Last synced: 11 days ago
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• Host: GitHub
• URL: https://github.com/evanw/theta
• Owner: evanw
• License: other
• Created: 2015-12-22T16:52:40.000Z (almost 9 years ago)
• Default Branch: master
• Last Pushed: 2021-05-04T17:42:20.000Z (over 3 years ago)
• Last Synced: 2024-10-14T09:23:25.308Z (30 days ago)
• Language: JavaScript
• Homepage: http://thetamath.com
• Size: 2.46 MB
• Stars: 749
• Watchers: 26
• Forks: 39
• Open Issues: 5
• Metadata Files:
  • Readme: README.md
  • License: LICENSE.md

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README

        
# Theta

Website: http://thetamath.com

This is a simple web app that graphs an equation and allows you to pan and zoom around the coordinate grid. It was my winter 2015-2016 break project, developed here and there over two weeks. Interesting bits:

* Custom equation editor with exponents, fractions, and other stuff

* Live errors inline as you type, sort of like an IDE

* GPU-powered anti-aliased equation rendering, handles equations that are impossible to solve

* Custom text rendering using subpixel anti-aliasing and GPU quadratic curve evaluation (see the article [Easy Scalable Text Rendering on the GPU](https://medium.com/@evanwallace/c3f4d782c5ac) for a detailed description)

* Uses the [Skew](http://skew-lang.org/) programming language and the [GLSLX](http://evanw.github.io/glslx/) compiler, ends up as a [few dozen kilobytes](http://thetamath.com/compiled.js) of optimized JavaScript

* Abuses GitHub's custom 404 handler to make bookmarkable URLs without needing a hosting provider :)

Examples:

* http://thetamath.com/app/y=sin(3x+sin4(y+sin2(x+siny)))

* http://thetamath.com/app/sin(x-cosπy)≤sin(y+cosπx)

* http://thetamath.com/app/ysqrt(y^2+x^2)=x

* http://thetamath.com/app/sin(2lnr+θ)≤0