Pomax

Writing Type2 sin(x) and cos(x) functions

If we want to make a font in which the glyphs are turned some random amount, we'll need to make sure we have a rotate function available. Normally, this is something you do with a rotation matrix, but that rotation matrix depends on trigonometric functions, and Type2 charstring instructions don't come with a trig. library, so ... we need to write our own!

In fact, let's use Bhaskara I's method of "sort of kind of" approximating a sine wave -or rather half of one- by using a relatively simple expression:

                 4x(π-x)
sin(x) = 4 * ----------------
              5π^2 - 4x(π-x)

Pomax

/**
 * First things first: I am *lazy*. I will write a tool to do the thing I want to
 * do so I don't have to do it a second time, ever. Or until a new programming
 * language comes around. Generally the latter, but enough about that:
 *
 * This is a Node.js utility for taking the dir you are in right now, firing up
 * an express server, and giving you image browsing on localhost:8080 with simple
 * left/right controls once you're actually viewing images, and "up" control to
 * go up a directory.
 *

Pomax

(function bookmarklet(window) {

  var document = window.document;
  var body = document.body;

  /**
   * Sort a collection of images based on their dominant hue,
   * and show the rgb+h analysis in a nice little image alongside.
   *
   * for instance, use this bookmarklet on